- Faculty of Environmental Engineering
- Faculty Departments
- Department of Building Energetics
Department of Building Energetics
This is a nationally leading specialised academic unit that prepares engineers to develop, evaluate, and manage energy-efficient and sustainable buildings and building engineering systems.
About the Department
Department Activity Areas
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Direct collaboration with industry and strong labour market demand for graduates.
The Department maintains active cooperation with leading companies in Lithuania and internationally.The Department maintains active cooperation with leading companies in Lithuania and abroad operating in heating, ventilation, cooling, heat and gas supply, and renewable energy systems. Its partners include design, manufacturing, and maintenance companies, ministries, agencies, and related institutions. Graduates of the Department are highly valued in the labour market, as evidenced by scholarships awarded by three major companies to the best-performing students. Students gain hands-on experience during their studies and frequently begin their professional careers before graduation.
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Advanced Building and Energy Systems Laboratories
The Department has modern laboratories for student and researcher experiments.The Department operates modern laboratories that enable experimental work with real building microclimate systems. Research and educational studies are carried out using thermography, digital twins, and computer modelling, supporting the development of innovative solutions to enhance the efficiency of energy transformation, supply, and consumption.
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International visibility and participation in European projects
The Department鈥檚 academic staff and researchers actively participate in international and national research and innovation projects.Academic staff and researchers of the Department are actively engaged in Horizon Europe, COST, LIFE, and other international and national research and innovation programmes. Students are integrated into research groups, where they gain practical experience, develop expertise, and build professional networks at an international level.
Building Energy and Microclimate Systems Laboratory
This laboratory belongs to the Department of Building Energy Engineering.
The BEMS Laboratory researches, develops, and applies solutions for building energy supply, as well as energy consumption systems and processes. Its research contributes to sustainable energy use and the development of modern buildings.
About the Laboratory
Goals
- Providing research and knowledge dissemination services on building energy performance, energy efficiency, and indoor microclimate quality;
- Researching and implementing renewable energy integration solutions in building energy systems;
- Assessing the life cycle and thermodynamic performance of building energy supply and consumption systems;
- Integrating, modelling, and planning building energy supply and use systems and processes.
Services
The laboratory鈥檚 services are listed below.
Modelling of energy converters and systems
TRNSYS 17.0 (building microclimate and energy demand), DesignBuilder (interaction between building envelope elements, systems, microclimate, and energy demand), Polysun (processes in solar energy converters and their systems), EnergyPro (regional/area energy supply, particularly co- and trigeneration), PHPP (supporting design software for the Passive House standard), SimaPro (life cycle assessment), HEAT2/HEAT3 (two- and three-dimensional transient heat transfer), and PHOENICS (computational fluid dynamics).
Technical feasibility assessment of the integration of renewable energy sources in buildings.
The research covers the use of renewable energy sources such as solar, wind, geothermal energy, biofuels, and others to meet building energy needs. The work includes analysis of current building energy demand, which allows energy and capacity balances to be established. A technical assessment of renewable energy integration is carried out, conceptual technical solutions are proposed, and economic and environmental evaluations of the suggested alternatives are performed. The search for financial support for selected implementation options is also undertaken at national and EU levels.
Building energy audit with on-site measurement of actual energy parameters.
A building energy audit includes assessment of the technical condition of the building envelope and engineering systems, analysis of energy consumption, and energy normalisation calculations. On-site measurements are carried out using thermography, thermal resistance testing, and airtightness analysis. A calibrated energy model is created based on measured and historical energy data. Energy-saving measures are proposed, and their economic feasibility is evaluated. Specialists may also participate in ESCO projects and provide concept development and technical and economic assessment of heat sources and integrated solutions.
Energy planning: preparation of district heating development plans and feasibility studies for energy supply in residential areas.
Specialists develop territorial heating plans and conduct feasibility studies on sustainable energy supply for settlements, focusing on renewable energy development and environmental impact reduction. They also prepare documentation required for project funding.
The Centre works with responsible real estate developers planning energy-efficient residential areas. The Department offers consultancy at the design stage, support in joining EU demonstration programmes, and assistance in preparing funding applications.
Building thermographic analysis and measurement of the actual thermal resistance of building envelope elements.
Thermographic analysis of thermal structures using images (photographs) and dynamic processes in video format is carried out. The thermal performance of building envelope elements is assessed, and potential construction defects and specific problem areas are identified. Measurements of the actual thermal resistance of envelope elements are then performed in these areas. Conclusions are provided, and the results serve as a basis for defining defect remediation requirements.
Building or indoor microclimate assessment
In the assessed building, measurements are carried out of air and surface temperatures, relative humidity, CO鈧� levels, airtightness, lighting, and noise. Ventilation airflow rates are also measured. The collected data are analysed, and conclusions are provided on possible solutions to identified problems.
Airtightness assessment of buildings or premises
A pressure test is performed in the building or room, with thermal imaging used to identify leakage areas. The air change rate at 50 Pa pressure difference is measured, and the results are used for building certification purposes.
Ventilation system assessment
Measurements of air velocity and duct pressure are performed to support the adjustment and balancing of ventilation systems.
Experimental studies of low-capacity heat transformers
These studies determine the seasonal energy efficiency of low-capacity (up to several tens of kW) energy converters, such as heat exchangers, heat pumps, refrigeration units, and boilers. The operating characteristics of these systems are analysed, and the impact of new components or equipment modifications on performance is assessed. Recommendations are provided to improve efficiency and optimise operating and energy transformation modes.
Contacts
Head of the Laboratory:
Dr. Dovydas Rimd啪ius
Phone: +370 5 251 2129
Email: dovydas.rimdzius@vilniustech.lt
Partners
Department of Building Energetics maintains active cooperation with social and business partners.
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Department Staff
The Department鈥檚 academic staff are recognised professionals with strong expertise in sustainability principles, integrating advanced technologies and teaching methods into their work. They are actively engaged in research and international projects and maintain close cooperation with the alumni community, which is involved in the study process. Lecturers are highly regarded by students for their teaching quality, professional competence, and constructive communication.
Administration
- Administration
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Prof. Dr. Violeta Motuzien臈Head
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Dr. Dovydas Rimd啪iusHead of Laboratory(ies)
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Thesis abstracts
Years
Qualification
Clear selections
Abu Muhammad Mustakim Reza
— Assoc Prof Dr Juozas Bielskus
An Investigation of Sustainable Modernization Options for the Salininkai District Heating System
The aim of this Master's thesis is to evaluate the performance of the Salininkai District Heating Network (DHN) in Vilnius, Lithuania, and propose a transformation roadmap aligned with...
An Investigation of Sustainable Modernization Options for the Salininkai District Heating System
Student:
Abu Muhammad Mustakim Reza
Supervisor:
Assoc Prof Dr Juozas Bielskus
Department:
Department of Building Energetics
Thesis abstract (LT)
艩io magistro darbo tikslas 鈥� 寞vertinti Vilniaus Salinink懦 centralizuoto 拧ilumos tiekimo (C艩T) tinklo efektyvum膮 ir pateikti transformacijos plan膮, pagr寞st膮 ketvirtos kartos centralizuoto 拧ilumos tiekimo principais. Tyrimas orientuotas 寞 sistemos efektyvumo didinim膮 ir pirmin臈s energijos vartojimo ma啪inim膮 tinkle, kuris aptarnauja 46 pastatus, kuriems 拧ilum膮 tiekia du gamtin臈mis dujomis k奴renami katilai, ir susiduria su tokiomis problemomis kaip 拧ilumos perdavimo nuostoliai bei pasenusi infrastrukt奴ra.
Naudojant EnergyPRO programin臋 寞rang膮, modeliuojami keli atnaujinimo scenarijai, 寞skaitant 1 MW galios oras鈥搗anduo tipo elektrinio 拧ilumos siurblio, didelio t奴rio 拧ilumos talpyklos bei vietin臈s saul臈s fotovoltin臈s elektrin臈s integravim膮 寞 sistem膮. Taip pat nagrin臈jami strukt奴riniai patobulinimai, tokie kaip 拧ilumos 拧altini懦 i拧d臈stymo keitimas ir decentralizacijos strategijos. Si奴lomi sprendimai vertinami pagal energijos poreikio ir nuostoli懦 scenarijus, bendr膮 sistemos efektyvum膮 bei pirmin臈s energijos faktoriaus (PEF) skai膷iavimus. Galutinis vertinimas apima technin臋 ir ekonomin臋 analiz臋, poveikio aplinkai vertinim膮 bei jautrumo analiz臋.
Tyrimas baigiamas strategin臈mis rekomendacijomis, kaip Salinink懦 C艩T tinkl膮 transformuoti 寞 moderni膮, tvari膮 ir atspari膮 拧ildymo sistem膮, galin膷i膮 tapti pavyzd啪iu pana拧iems centralizuoto 拧ilumos tiekimo tinklams 拧alto klimato Europos miestuose.
Darbas, be 寞vado, susideda i拧 septyni懦 dali懦: problemos ir aktualumo pristatymo bei suformulavimo, tvarios modernizacijos koncepcijos k奴rimo, literat奴ros ap啪valgos, metodologijos, rezultat懦, diskusijos, i拧vad懦 bei rekomendacij懦, ir bibliografini懦 拧altini懦.
Darb膮 sudaro 100 puslapi懦 pagrindinio teksto, 49 paveikslai, 7 lentel臈s, 8 lygtys ir 86 bibliografiniai 拧altiniai. Priedas pateikiamas atskirai
Thesis abstract (EN)
The aim of this Master's thesis is to evaluate the performance of the Salininkai District Heating Network (DHN) in Vilnius, Lithuania, and propose a transformation roadmap aligned with 4th Generation District Heating (4GDH) principles. The study focuses on improving system efficiency and reducing primary energy consumption in a network serving 46 buildings with two natural gas-fired boilers, facing challenges such as heat transmission losses and outdated infrastructure.
Multiple upgrade scenarios are simulated using EnergyPRO, including the integration of 1 MW air-to-water electric heat pump, large-scale thermal energy storage, and on-site solar photovoltaic generation. Additionally, structural improvements such as repositioning of heat sources and decentralization strategies are explored. The proposed alternatives are evaluated through energy demand and loss scenarios, overall system efficiency, and primary energy factor (PEF) calculations and finally vetted by technical and economic evaluation, environmental impact assessment and sensitivity analysis.
The research concludes with strategic recommendations for transforming Salininkai DHN into a modern, sustainable, and resilient heating system, potentially serving as a model for similar urban heating networks in cold-climate European cities.
The work consists of 7 parts apart from introduction: relevance and articulation of problem statement, sustainable modernization concept development, literature review, methodology, results, discussion, conclusions followed by recommendation and references.
The thesis includes 100 pages of main text, 49 figures, 7 tables, 8 equations, and 86 bibliographic entries. The supplement is included separately.
Aurimas Gurskis
— Assoc Prof Dr Violeta Misevi膷i奴t臈
Indoor Climate Systems of an Administrative Building in Klaip臈da
The Bachelor's thesis presents the design of heating, ventilation, and air conditioning (HVAC) systems for an administrative building in Klaip臈da, focusing on meeting the requirements of the A++...
Indoor Climate Systems of an Administrative Building in Klaip臈da
Student:
Aurimas Gurskis
Supervisor:
Assoc Prof Dr Violeta Misevi膷i奴t臈
Department:
Department of Building Energetics
Thesis abstract (LT)
Baigiamajame bakalauro darbe atliktas administracin臈s paskirties pastato Klaip臈doje 拧ildymo, v臈dinimo ir v臈sinimo (艩VOK) sistem懦 projektavimas, orientuotas 寞 A++ energinio naudingumo klas臈s reikalavim懦 寞gyvendinim膮 ir komforti拧ko mikroklimato u啪tikrinim膮. Atsi啪velgiant 寞 pastato architekt奴rinius ir funkcinius sprendinius, suprojektuotos trys pagrindin臈s in啪inerin臈s sistemos: 拧ildymo sistema su plok拧tiniais radiatoriais ir grindiniu 拧ildymu, mechanin臈 v臈dinimo sistema su oro ruo拧tuvu ir rotaciniu 拧ilumokai膷iu bei v臈sinimo sistema su 拧ilumos siurbliu ir lubiniais ventiliatoriniais konvektoriais. Visos mikroklimato sistemos parinktos pagal efektyvumo, patikimumo ir eksploatacini懦 savybi懦 kriterijus. Pritaikomas elektros energijos tiekimas i拧 nutolusios saul臈s elektrin臈s, u啪tikrinamas ne tik mikroklimato sistem懦 energetinis savaranki拧kumas, bet ir suma啪inamas poveikis aplinkai. Baigiamajame darbe pagrind啪iamas moderni懦 in啪inerini懦 sprendim懦 pritaikymas siekiant ilgalaikio tvarumo, auk拧tos energin臈s klas臈s ir komforto. Darbo pabaigoje pateikiamos i拧vados ir pasi奴lymai.
Darb膮 sudaro 13 dali懦: 寞vadas, baigiamojo darbo objektas, pastato statybos vietov臈s klimato duomenys, pastato konstrukcij懦 拧ilumin臈s charakteristikos, pastato projektin臈s 拧ilumos galios, patalp懦 mikroklimatas ir jo palaikymo sistemos pastato projektin臈s v臈sos apkrovos, b奴dingos patalpos mikroklimatui palaikyti reikaling懦 parametr懦, oro kieki懦, 拧ildymo ir v臈sinimo gali懦 skai膷iavimas, pastato in啪inerin臈s mikroklimato palaikymo sistemos, ekonominis vertinimas ir AE 拧altinio parinkimas i拧vados ir si奴lymai, literat奴ros s膮ra拧as, priedai.
Darbo apimtis 鈥� 70 p. teksto be pried懦, 56 iliustr., 26 lent., 25 bibliografiniai 拧altiniai.
Atskirai pridedami: 9 darbo priedai ir 14 br臈啪ini懦.
Thesis abstract (EN)
The Bachelor's thesis presents the design of heating, ventilation, and air conditioning (HVAC) systems for an administrative building in Klaip臈da, focusing on meeting the requirements of the A++ energy efficiency class and ensuring a comfortable indoor microclimate. Based on the architectural and functional design of the building, three main engineering systems were designed: a heating system with panel radiators and underfloor heating, a mechanical ventilation system with an air handling unit and rotary heat exchanger, and a cooling system with a heat pump and ceiling-mounted fan coil units. All microclimate systems were selected according to criteria of efficiency, reliability, and operational performance. Electricity is supplied from a remote solar power plant, ensuring not only the energy independence of the microclimate systems but also reducing environmental impact. The thesis justifies the use of modern engineering solutions to achieve long-term sustainability, high energy efficiency, and indoor comfort. Conclusions and recommendations are provided at the end of the work.
The thesis consists of 13 parts: introduction, object of the final thesis, climatic data of the building site, thermal characteristics of the building structures, design heat load of the building, indoor microclimate and its maintenance systems, design cooling load of the building, key parameters for maintaining the microclimate of a typical room, calculation of air volumes and heating and cooling capacities, engineering systems for indoor climate maintenance, economic evaluation and selection of the energy source, conclusions and recommendations, list of references, and appendices.
The written part includes 70 pages (excluding appendices), 56 illustrations, 26 tables, and 25 bibliographic sources.
Separately attached: 9 appendices and 14 technical drawings.
Darijus Sinkevi膷
— Dr R奴ta Miku膷ionien臈
Analysis of the Impact of Thermal Bridges for Energy Performance Class of Renovated Multi-apartment Buildings
In the master thesis the balcony assemblies of old-built apartment blocks and their impact on the energy performance of buildings are analysed. The aim of the study is...
Analysis of the Impact of Thermal Bridges for Energy Performance Class of Renovated Multi-apartment Buildings
Student:
Darijus Sinkevi膷
Supervisor:
Dr R奴ta Miku膷ionien臈
Department:
Department of Building Energetics
Thesis abstract (LT)
Magistro baigiamajame darbe analizuojami senos statybos daugiabu膷i懦 balkon懦 mazgai ir j懦 拧ilumini懦 tilteli懦 寞taka pastat懦 energiniam naudingumui. Tyrimo tikslas 鈥� pateikti konstrukcinius balkon懦 mazg懦 sprendinius, leid啪ian膷ius pasiekti A energinio naudingumo klas臋. Naudojantis THERM programine 寞ranga buvo modeliuojami ir analizuojami 寞vair奴s mazg懦 variantai: tiek nerenovuoti (寞stiklinti ir atviri balkonai), tiek renovuoti (su papildoma termoizoliacija, metaliniu balkonu, 拧al膷io nutraukimo detale, 拧iltinimu akmens vata). 漠vertinus 拧ilumos perdavimo koeficientus ir 拧ilumos sraut懦 pasiskirstym膮, nustatyta, kad efektyviausias sprendimas yra balkonas, ap拧iltintas akmens vata 鈥� jo 拧ilumos perdavimo koeficientas buvo ma啪iausias. Darbo rezultatai parodo 拧ilumini懦 tilteli懦 ma啪inimo svarb膮 pastat懦 renovacijoje ir 寞vertina kaip 拧i problema pasirei拧kia Lietuvos klimato s膮lygomis.
Darbo apimtis 鈥� 59 p. teksto be pried懦, 58 iliustr., 14 lent., 20 bibliografiniai 拧altiniai. Atskirai pridedami darbo priedai.
Thesis abstract (EN)
In the master thesis the balcony assemblies of old-built apartment blocks and their impact on the energy performance of buildings are analysed. The aim of the study is to present structural solutions for balcony assemblies and their thermal bridges to achieve energy performance class A. Using THERM software, different variants of the units were modelled and analyzed: both non-renovated (glazed and open balconies) and renovated (with additional thermal insulation, metal balcony, cold break detail, rock wool insulation). The heat transfer coefficients and heat flux distribution were assessed and the balcony with rock wool insulation was found to be the most efficient solution with the lowest heat transfer coefficient. The results of study highlights the importance of reducing thermal bridges in building renovation and assesses how this problem manifests itself in the Lithuanian climate.
The volume of the thesis is 59 p. of text without appendices, 58 illustrations, 14 tables, 20 bibliographic sources. The annexes are attached separately.
David Akintunde Katende
— Assoc Prof Dr Giedr臈 Streckien臈
Performance Analysis of an Unglazed Transpired Solar Collector in Different Climates
This master's thesis investigates the performance of Unglazed Transpired Solar Collectors (UTSCs) across five different climatic zones: tropical (Kampala, Uganda), desert (Riyadh, Saudi Arabia), Mediterranean (Madrid, Spain), continental...
Performance Analysis of an Unglazed Transpired Solar Collector in Different Climates
Student:
David Akintunde Katende
Supervisor:
Assoc Prof Dr Giedr臈 Streckien臈
Department:
Department of Building Energetics
Thesis abstract (LT)
艩iame magistro darbe tiriamas ne寞stiklinto pratakaus saul臈s kolektoriaus (NPSK) veikimas penkiose skirtingose klimato zonose: atogr膮啪懦 (Kampala, Uganda), dykumos (Rijadas, Saudo Arabija), Vidur啪emio j奴ros (Madridas, Ispanija), 啪emynin臈je (Vilnius, Lietuva) ir poliarin臈je (Svalbardas, Norvegija). Tyrime naudojama TRNSYS programa, skirta NPSK veikimui modeliuoti, analizuojant pagrindinius rodiklius, tokius kaip 拧iluminis efektyvumas, i拧tekan膷io oro temperat奴ra ir naudingoji 拧ilumin臈 energija. Tyrime pabr臈啪iama klimato veiksni懦 (saul臈s spinduliuot臈s, aplinkos oro temperat奴ros) 寞taka NPSK efektyvumui ir atliekamas ekonominio technologijos vertinimas kiekvienai vietovei. Rezultatai rodo, kad d臈l pastovios saul臈s spinduliuot臈s NPSK optimaliai veikia atogr膮啪懦 ir dykum懦 klimato zonose, o 拧altesniuose regionuose, kuriuose vyrauja sezoniniai svyravimai, j懦 efektyvumas ma啪臈ja. Darbo pabaigoje pateikiamos rekomendacijos d臈l NPSK diegimo, pabr臈啪iant j懦 tinkamum膮 regionuose, turintiems didel寞 saul臈s i拧tekli懦 potencial膮, ir si奴loma naudoti hibridines sistemas ma啪iau palankiomis klimato s膮lygomis.
Thesis abstract (EN)
This master's thesis investigates the performance of Unglazed Transpired Solar Collectors (UTSCs) across five different climatic zones: tropical (Kampala, Uganda), desert (Riyadh, Saudi Arabia), Mediterranean (Madrid, Spain), continental (Vilnius, Lithuania), and polar (Svalbard, Norway). The study employs TRNSYS software to simulate UTSC performance, analyzing key metrics such as thermal efficiency, outlet air temperature, and useful energy gain. The research highlights the influence of climatic variables (solar irradiance, ambient temperature) on UTSC effectiveness and includes an economic viability assessment for each location. Results indicate that UTSCs perform optimally in tropical and desert climates due to consistent solar radiation, while their efficiency declines in colder regions with seasonal variability. The thesis concludes with recommendations for UTSC deployment, emphasizing their suitability for regions with high solar availability and proposing hybrid systems for less favorable climates.
Deimant臈 Andrulionyt臈
— Assoc Prof Dr Artur Rogo啪a
Design of Heat Supply Systems for Buildings in the Santariskes Quarter of Vilnius City
In the final bachelor's thesis, the design of heat supply systems for the buildings of the Vilnius city quarter, located in Santariskes, is carried out. The work designs...
Design of Heat Supply Systems for Buildings in the Santariskes Quarter of Vilnius City
Student:
Deimant臈 Andrulionyt臈
Supervisor:
Assoc Prof Dr Artur Rogo啪a
Department:
Department of Building Energetics
Thesis abstract (LT)
Baigiamajame bakalauro darbe atliekamas Vilniaus miesto kvartalo, esan膷io Santari拧k臈se, pastat懦 apr奴pinimo 拧iluma sistem懦 projektavimas. Darbe projektuojamas centralizuotas 拧ilumos tiekimo tinklas (C艩T) 32 kvartale esantiems gyvenamosios paskirties pastatams. Projektuojama sistema skirta u啪tikrinti 拧ilumos tiekim膮 kar拧to vandens ruo拧imui ir patalp懦 拧ildymui. Kvartale projektuojamas bekanalis 拧ilumos tiekimo tinklas su i拧 anksto izoliuotais plieniniais vamzd啪iais. Darbe pateikiamos pastat懦 modernizavimo alternatyvos. Viena i拧 alternatyv懦 yra skirta kvartale esantiems daugiabu膷iams. 艩iems pastatams numatomas saul臈s kolektori懦 寞rengimas ant stogo, siekiant padengti kar拧to vandens poreikius. Sekanti alternatyva skirta gyvenamiesiems vienbu膷iams, dvibu膷iams ir koted啪o tipo pastatams. 艩iems objektams numatoma renovacija iki A++ energin臈s naudingumo klas臈s, 拧ilumos siurblio oras-vanduo 寞rengimas ir saul臈s elektrin臈s ant pastato stogo projektavimas, taip u啪tikrinant pastat懦 apr奴pinim膮 atsinaujinan膷ia energija. 艩ios alternatyvos paskirtis - tenkinti pastato 拧ilumos ir kar拧to vandens poreikius. 漠rengiamoms sistemoms atliekamas ekonominis skai膷iavimas ir vertinimas, nustatomas atsipirkimo laikotarpis. Atlikus reikiamus skai膷iavimus ir vertinimus, pateikiamos baigiamojo darbo i拧vados.
Baigiam膮j寞 darb膮 sudaro: 寞vadas, vietov臈s klimatologiniai duomenys, tipinio pastato apra拧as, atitvar懦 拧ilumin臈s charakteristikos, pastat懦 拧ilumos gali懦 ir poreikio nustatymas, hidrauliniai skai膷iavimai, centralizuoto 拧ilumos tiekimo tinklo projektavimas, kvartalo pastat懦 modernizavimas ir alternatyvi懦 apr奴pinimo 拧iluma variant懦 projektavimas, ekonominis vertinimas, i拧vados, literat奴ros s膮ra拧as ir priedai.
Thesis abstract (EN)
In the final bachelor's thesis, the design of heat supply systems for the buildings of the Vilnius city quarter, located in Santariskes, is carried out. The work designs a centralized heat supply network (DHS) for 32 residential buildings in block. The system aims to ensure heat supply for hot water preparation and space heating. A ductless heat supply network with pre-insulated steel pipes has been implemented in the block. The work presents building modernization alternatives. One of the alternatives is for apartment buildings in the block. These buildings will have to install solar collectors on the roof in order to cover hot water needs. The next alternative is for residential one-, two- and cottage-type buildings. These residences are planned to be renovated to A++ energy efficiency class, equipped with an air-to-water heat pump system, and a solar power plant on the roof of the building, thus ensuring the provision of buildings with renewable energy. The purpose of this alternative is to meet the building's heat and hot water needs. An economic calculation and assessment are carried out for the installed systems, and the payback period is determined. After the necessary calculations and assessments are performed, the conclusions of the final thesis are summarized.
The final thesis consists of: an introduction, climatological data of the area, a description of a typical building, thermal characteristics of the partitions, determination of the heat capacity and demand of buildings, hydraulic calculations, design of a centralized heat supply network, modernization of buildings in the block and design of alternative heat supply options, economic evaluation, conclusions, references and annexes.
Erika Litvinavi膷i奴t臈
— Assoc Prof Dr Violeta Misevi膷i奴t臈
Indoor Climate Systems of an Administrative Building in Vilnius
The bachelor鈥榮 thesis focuses on the design of the indoor climate for an administrative building located in Vilnius. The project includes the design of heating, ventilation, and cooling...
Indoor Climate Systems of an Administrative Building in Vilnius
Student:
Erika Litvinavi膷i奴t臈
Supervisor:
Assoc Prof Dr Violeta Misevi膷i奴t臈
Department:
Department of Building Energetics
Thesis abstract (LT)
Baigiamajame bakalauro darbe administraciniam pastatui Vilniuje suprojektuotos mikroklimato: 拧ildymo, v臈dinimo ir v臈sinimo sistemos bei parinkta atsinaujinan膷ios energetikos alternatyva, kuri padengia visus arba dalinius 拧ildymo/v臈sinimo poreikius. Pastat膮 aptarnauja 6 oro ruo拧tuvai, kurie bendrai 寞 pastat膮 tiekia 13883 m3/h oro kiek寞. Atlikus pastato modeliavim膮 su IDA ICE modeliavimo priemone yra gautos 拧ildymo ir v臈sinimo galios ir poreikiai. Pastato projektin臈 拧ildymo galia 鈥� 64,6 kW, 拧iai galiai patenkinti yra projektuojama vandenin臈 grindinio 拧ildymo sistema, radiatoriai bei konvektoriai. 艩iluma ruo拧iama 拧ilumos punkte. Pastato 26 v臈sinam懦 patalp懦 137 kW galiai u啪tikrinti projektuojami ventiliatoriniai konvektoriai. V臈sa yra ruo拧iama 拧al膷io ma拧inoje, esan膷ioje r奴syje. Alternatyviam variantui pasirinkta geotermini懦 gr臋啪ini懦 sistema su gruntas 鈥� vanduo 拧ilumos siurbliu. Pastato sklype projektuojami 12 gr臋啪ini懦 po 100 metr懦 gylio. 艩i technologija leid啪ia padengti 拧ildymo ir v臈sinimo poreikius ne piko metu.
Darbo apimtis - 126 p. teksto be pried懦, 92 iliustr., 38 lent., 22 bibliografiniai 拧altiniai.
Atskirai pridedami: 20 br臈啪ini懦.
Thesis abstract (EN)
The bachelor鈥榮 thesis focuses on the design of the indoor climate for an administrative building located in Vilnius. The project includes the design of heating, ventilation, and cooling systems, as well as the selection of a renewable energy alternative capable of fully or partially covering heating and cooling demands. The building is served by 6 air handling units supplying a total of 13883 m3/h of air. The building has been modelled with the IDA ICE simulation tool to obtain the heating and cooling capacities (kW) and demands (MWh). The design heating capacity of the building is 64,6 kW, for which a hydronic underfloor heating system, radiators and convectors are designed. The heat is generated by a heat point. Fan-assisted convectors shall be designed to provide 137 kW of cooling to the 26 cooled rooms of the building. Cooling is provided by a chiller in the basement. As an alternative, a geothermal borehole system with a ground-to-water heat pump is selected. 12 boreholes of 100 meters depth each are planned on the building plot. This technology allows to cover heating and cooling needs at off-peak times.
The volume of the work is 126 p. of text without appendices, 92 illustrations, 38 tables, 18 bibliographical sources.
Separately attached: 20 schemes.
Esosa Gift Aigbodion
— Assoc Prof Dr K臋stutis Valan膷ius
The Influence of Non-Transparent Envelope Insulation on the Cooling Demand of Residential Buildings in Nigeria
The thermal performance of a building envelope significantly impacts cooling energy consumption, particularly in countries with very hot climates like Nigeria. Non-transparent envelope insulation, including walls, roofs, and...
The Influence of Non-Transparent Envelope Insulation on the Cooling Demand of Residential Buildings in Nigeria
Student:
Esosa Gift Aigbodion
Supervisor:
Assoc Prof Dr K臋stutis Valan膷ius
Department:
Department of Building Energetics
Thesis abstract (LT)
Pastato atitvar懦 拧ilumin臈s savyb臈s turi didel臋 寞tak膮 v臈sinimo energijos suvartojimui, ypa膷 tokiose kar拧to klimato 拧alyse kaip Nigerija. Neskaidri懦 atitvar懦, 寞skaitant sienas, stogus ir grindis, ap拧iltinimas atlieka svarb懦 vaidmen寞 ma啪inant 拧ilumos pritek臈jim膮, gerinant patalp懦 拧ilumin寞 komfort膮 ir reguliuojant patalp懦 temperat奴r膮. 艩iame tyrime nagrin臈jama Nigerijoje pastatyta tradicin臈 3 sluoksni懦 neap拧iltinta pastato siena ir lyginama su ap拧iltinta 4 sluoksni懦 pastato siena, kurioje naudojamos 寞vairios izoliacin臈s med啪iagos, siekiant 寞vertinti neskaidrios atitvar懦 izoliacijos 寞tak膮 gyvenam懦j懦 pastat懦 v臈sinimo poreikiui Nigerijoje. Analizuojant skirtingas izoliacines med啪iagas ir j懦 stor寞, 拧iame tyrime vertinamas j懦 veiksmingumas ma啪inant v臈sinimo apkrovas. Atliekant tyrim膮 atsi啪velgiama 寞 pagrindinius klimato veiksnius, tokius kaip saul臈s spinduliuot臈 ir aplinkos temperat奴ra, kad b奴t懦 galima nustatyti izoliacijos strategijas siekiant energijos vartojimo efektyvumo. I拧vados rodo, kad tinkamai izoliuotos neskaidrios atitvaros gali suma啪inti gyvenam懦j懦 pastat懦 vidaus temperat奴r膮 ir v臈sinimo energijos poreik寞. 艩iame tyrime pabr臈啪iama, kaip svarbu taikyti energij膮 taupan膷ias atitvar懦 konstrukcijas, kad b奴t懦 padidintas tvarumas ir suma啪inta priklausomyb臈 nuo mechanini懦 v臈sinimo sistem懦. 艩ios 寞啪valgos gal臈t懦 prisid臈ti pl臈tojant nauj膮 praktik膮, skirt膮 pastat懦 energiniam efektyvumui didinti Nigerijos gyvenam懦j懦 pastat懦 statybos ir renovacijos sektoriuje.
Thesis abstract (EN)
The thermal performance of a building envelope significantly impacts cooling energy consumption, particularly in countries with very hot climates like Nigeria. Non-transparent envelope insulation, including walls, roofs, and floors, plays a vital role in reducing heat gain, improving indoor thermal comfort, and regulating indoor temperature. This study examines the traditional 3-layer uninsulated building wall constructed in Nigeria and compares it to an insulated 4-layer building wall using various insulation materials to evaluate the influence of non-transparent envelope insulation on the cooling demand of residential buildings in Nigeria. By analysing different insulation materials and thicknesses, this study assesses their effectiveness in minimising cooling loads. The research considers key climatic factors such as solar radiation and ambient temperature to determine insulation strategies for energy efficiency. Findings indicate that properly insulated, non-transparent envelopes can lower indoor temperatures and cooling energy demand in residential buildings. However, factors like material selection and installation also influence the overall performance of these buildings. This study emphasises the importance of adopting energy-efficient envelope designs to enhance sustainability and reduce dependence on mechanical cooling systems. These insights could greatly contribute to the development of new practices for improving building energy efficiency in Nigeria鈥檚 residential building construction and renovation sector.
Justinas Liberis
— Assoc Prof Dr Vil奴n臈 Lapinskien臈
The Design of Indoor Climate Systems of The Furniture Centre in Vilnius
The final thesis analyzes the microclimate systems of an administrative building in Vilnius. The total building area is 448.9 m虏. All building envelopes and microclimate systems are designed...
The Design of Indoor Climate Systems of The Furniture Centre in Vilnius
Student:
Justinas Liberis
Supervisor:
Assoc Prof Dr Vil奴n臈 Lapinskien臈
Department:
Department of Building Energetics
Thesis abstract (LT)
Baigiamajme darbe nagrin臈jamos administracin臈s paskirties pastato Vilniuje mikroklimato sistemos. Bendras pastato plotas 鈥� 448,9 m虏. Visos pastato atitvaros, bei mikroklimato sistemos suprojektuotos pagal A++ energinio naudingumo klas臋 atitinkan膷ius reikalavimus. Darbe apskai膷iuoti pastato 拧ilumos nuostoliai, nustatytos mikroklimato sistem懦 galios, metiniai energijos poreikiai. Projektuojamos mikroklimato sistemos 鈥� 惫臈诲颈苍颈尘补蝉, 拧颈濒诲测尘补蝉 ir 惫臈蝉颈苍颈尘补蝉. Pastatui suprojektuotos dvi mechaninio oro tiekimo ir 拧alinimo sistemos, kolektorin臈 grindinio ir konvektorinio 拧ildymo sistema. Abi oro tiekimo bei 拧alinimo sistemos atliks orin寞 拧ildym膮. Parinktoms patalpoms suprojektuota v臈sinimo sistema su ventiliatoriniais konvektoriais. Alternatyvus sprendimas 鈥� 16,7 kW galios saul臈s elektrin臈s 寞rengimas ant pastato auk拧tesniojo stogo. Darbe atliktas ekonominis vertinimas.
Thesis abstract (EN)
The final thesis analyzes the microclimate systems of an administrative building in Vilnius. The total building area is 448.9 m虏. All building envelopes and microclimate systems are designed to meet the requirements of the A++ energy efficiency class. The thesis includes calculations of the building's heat losses, determination of the capacities of microclimate systems, and annual energy demands. The designed microclimate systems include ventilation, heating, and cooling. Two mechanical air supply and exhaust systems are designed for the building, along with a collector-based underfloor and convector heating system. Both air handling systems will provide air-based heating. A cooling system with fan coil units is designed for selected premises. An alternative solution - installation of a 16.7 kW solar power plant on the upper roof of the building. An economic evaluation has also been carried out.
Karolis Truskauskas
— Jolanta 膶iuprinskien臈
Indoor Climate Systems of the Car Dealership in Vilnius
The microclimate systems designed in this work include ventilation, heating and cooling. The purpose of the building is a car showroom. The building consists of two functional parts:...
Indoor Climate Systems of the Car Dealership in Vilnius
Student:
Karolis Truskauskas
Supervisor:
Jolanta 膶iuprinskien臈
Department:
Department of Building Energetics
Thesis abstract (LT)
艩iame darbe suprojektuotos mikroklimato sistemos: 惫臈诲颈苍颈尘补蝉, 拧颈濒诲测尘补蝉 ir 惫臈蝉颈苍颈尘补蝉. Darbe nagrin臈jamo pastato paskirtis 鈥� automobili懦 pardavimo salonas. Pastatas susideda i拧 dviej懦 funkcini懦 dali懦 鈥� automobili懦 pardavimo salono ir automobili懦 serviso. Bendras pastato plotas siekia 438 m虏. Projektuojama energinio naudingumo klas臈 鈥� A++, tod臈l visos pastato atitvaros turi atitikti 拧iai klasei keliamus reikalavimus. Pastatui suprojektuotos dvi atskiros v臈dinimo sistemos: OTIS鈥�1 鈥� skirta automobili懦 salono patalpoms, OTIS鈥�2 鈥� skirta automobili懦 serviso patalpoms. Pastate projektuojama 拧ildymo sistema, kurios 拧ilumne拧is 鈥� vanduo. Automobili懦 salono patalpos bus 拧ildomos grindiniu 拧ildymu, o serviso patalpose naudojami vandeniniai 拧ildytuvai. 艩ilumos 拧altinis 鈥� centralizuoti miesto 拧ilumos tinklai. Parinkta 拧ilumos punkto pagrindin臈 寞ranga: 拧ilumokaitis, pl臈timosi indas ir cirkuliacinis siurblys. Taip pat projektuojama vandens pagrindu veikianti v臈sinimo sistema. V臈sinimas bus vykdomas naudojant kasetinius ventiliatorinius konvektorius. Parinkta v臈sinimo 寞ranga: v臈sinimo agregatas, i拧sipl臈timo indas ir cirkuliacinis siurblys. Nagrin臈ta alternatyva buvo pastato lang懦 g faktoriaus ma啪inimas. Atliktas bazinio ir alternatyvaus sprendim懦 ekonominis vertinimas, siekiant nustatyti, ar nagrin臈jama alternatyvi priemon臈 yra ekonomi拧kai naudinga. Darbo apimtis 89 psl., teksto be pried懦, 43 iliustr., 33 lent., 17 拧altini懦, 10 pried懦 ir 11 br臈啪ini懦.
Thesis abstract (EN)
The microclimate systems designed in this work include ventilation, heating and cooling. The purpose of the building is a car showroom. The building consists of two functional parts: a car showroom and a car service area. The total area of the building is 438 m虏. The energy performance class of the design is A++, therefore all building envelopes must comply with the requirements of this class. Two separate ventilation systems have been designed for the building: OTIS-1 for the car showroom and OTIS-2 for the car service area. The building will have a heating system with water as the heat transfer medium. The car showroom will be heated by underfloor heating and the service area by water heaters. The heat source is the centralised district heating network. The main equipment selected for the heat substation is a heat exchanger, an expansion vessel and a circulating pump. The cooling system for the building designed to be a water-based system. The cooling will be provided by means of cassette fan convectors. The cooling equipment selected includes a cooling unit, an expansion vessel and a circulating pump. The alternative considered was the reduction of the g-factor of the building windows. An economic evaluation of both the baseline solution and the alternative was carried out. The thesis consists of 89 pages of text without appendices, 40 illustrations, 32 tables, 17 references, 10 annexes and 11 technical drawings.
Matas 沤ostautas
— Assoc Prof Dr Juozas Bielskus
Design of Microclimate Systems for a Residential Apartment Building in Vilnius.
This thesis presents the design of microclimate systems 鈥� ventilation, heating, and cooling 鈥� for a residential apartment building located on I. Labutyt臈 street in Vilnius. The total...
Design of Microclimate Systems for a Residential Apartment Building in Vilnius.
Student:
Matas 沤ostautas
Supervisor:
Assoc Prof Dr Juozas Bielskus
Department:
Department of Building Energetics
Thesis abstract (LT)
艩iame darbe suprojektuotos gyvenamojo daugiabu膷io, esan膷io Vilniuje, I. Labutyt臈s gatv臈je, mikroklimato sistemos: 惫臈诲颈苍颈尘补蝉, 拧颈濒诲测尘补蝉 ir 惫臈蝉颈苍颈尘补蝉. Bendras pastato plotas yra 859,12 m虏. Projektuojama energinio naudingumo klas臈 鈥� A++. Pastate numatoma 13 atskir懦 v臈dinimo sistem懦, i拧 kuri懦 12 yra gyvenamiesiems butams skirtos v臈dinimo sistemos. Bendro naudojimo patalpoms suprojektuota atskira AHU-0 v臈dinimo sistema. Pastate esan膷ios gyvenamos patalpos yra 拧ildomos grindiniu 拧ildymu, o bendro naudojimo patalpose suprojektuoti radiatoriai. 艩ildymo sistemoje naudojamas 拧ilumne拧is 鈥� vanduo, o 拧ilumos 拧altinis 鈥� centralizuoti 拧ilumos tinklai. Darbe apskai膷iuota ir parinkta visa 拧ildymo sistemos 寞ranga bei suprojektuotas 拧ilumos punktas su 拧ilumokai膷iu, cirkuliaciniu siurbliu ir i拧sipl臈timo indu. Pastatui v臈sinti numatoma centralizuota sistema. Gyvenamose patalpose suprojektuoti ventiliatoriniai konvektoriai, 寞 kuriuos tiekiamas vandens ir 35% etilenglikolio mi拧inys. V臈sinimo agregatas yra numatomas ant pastato stogo. Sistemai taip pat apskai膷iuota ir parinkta visa reikiama 寞ranga, kaip v臈sinimo agregatas, cirkuliacinis siurblys, i拧sipl臈timo indas. Suprojektuotoms pastato mikroklimato sistemoms yra nagrin臈jamos alternatyvos 鈥� 拧ilumos siurblys bei saul臈s elektrin臈. 艩ioms alternatyvoms atliktas ekonominis vertinimas 20 met懦 eksploataciniam laikotarpiui. Darbo apimtis 鈥� 87 psl. be pried懦, 58 iliustracijos, 41 lentel臈, 31 拧altiniai, 32 priedai.
Thesis abstract (EN)
This thesis presents the design of microclimate systems 鈥� ventilation, heating, and cooling 鈥� for a residential apartment building located on I. Labutyt臈 street in Vilnius. The total area of the building is 859,12 m2. The projected energy efficiency class of the building is A++. The building includes 13 separate ventilation systems, 12 of which are intended for residential apartments. A separate AHU-0 ventilation system is designed for common-use areas. The residential spaces in the building are heated using floor heating, while radiators are planned for the common-use areas. The heating system uses water as the heat transfer medium, with centralized district heating as the heat source. All the necessary heating system equipment has been calculated and selected, and a heating unit with a heat exchanger, circulation pump, and expansion tank has been designed. The building is planned to be cooled via a centralized cooling system. Fan coil units are designed for the residential areas, which are supplied with a mixture of water and 35% ethylene glycol. The cooling unit is planned to be installed on the building鈥檚 roof. All the necessary equipment for the system, such as the cooling unit, circulation pump, and expansion tank, has also been calculated and selected. This thesis also presents alternative solutions for the designed microclimate systems, specifically, a heat pump and a solar power plant. An economic assessment for these alternatives was conducted for a 20-year operational period. The thesis comprises 87 pages excluding appendices, with 58 illustrations, 41 tables, 31 reference, and 32 appendices.