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Journal articles on the topic 'Šilumos energija'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Mikučionienė, Rūta, and Vygantas Žėkas. "ENERGIJOS ŠALTINIŲ PARINKIMO ĮTAKA PASTATO ENERGINIAM NAUDINGUMUI / IMPACT OF ENERGY SOURCES SELECTION FOR ENERGY PERFOMANCE OF BUILDING." Mokslas - Lietuvos ateitis 10 (July 5, 2018): 1–6. http://dx.doi.org/10.3846/mla.2018.3248.

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The article analyzes energy supply alternatives for administrative nearly zero energy building in Kaunas. Alternative energy production systems such as biofuel boiler, condensing boiler, heat pumps (air-water and groundwater), solar photovoltaic, solar collectors and combinations of these systems are analysed. The simulation of analysed building energy demands has been made using DesignBuilder modelling software and modelling of energy production alternatives has been performed using energyPRO software. In order to determine the optimal energy production alternative, the combinations of techno

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Čiuprinskas, Kęstutis, and Vilius Šipulskis. "ŠILUMOS SIURBLIŲ INTEGRAVIMO Į ORO RUOŠTUVUS ENERGINĖ ANALIZĖ / ENERGY EFFICIENCY GAIN OF HEAT PUMP INTEGRATION IN AIR HANDLING UNITS." Mokslas - Lietuvos ateitis 10 (July 5, 2018): 1–5. http://dx.doi.org/10.3846/mla.2018.3245.

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This article describes how heat pumps (HP) integrated in air handling units (AHU) proud against the analogous AHU with external heat pumps. Two almost identical (except heat pump position) air handling units were analysed. During the experimental study supply and return air temperatures and AHU’s fans power were measured. Efficiency indicators and consumed energy were calculated based on measured data. Seasonal performance factor (SCOP) and total annual energy use was evaluated for both units. During the economical evaluation was found, that AHU with integrated HP can payback within 10 years c

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Monstvilas, Edmundas, Karolis Banionis, Vytautas Stankevičius, Jūratė Karbauskaitė, and Raimondas Bliūdžius. "HEAT GAINS IN BUILDINGS ‐ LIMIT CONDITIONS FOR CALCULATING ENERGY CONSUMPTION." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 16, no. 3 (2010): 439–50. http://dx.doi.org/10.3846/jcem.2010.50.

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The results of analysis presented in the paper are related to the certification of energy performance in buildings using calculation methods, when the real energy consumption of the building is not analyzed. Energy consumption for cooling is not examined. Heat transmission losses could be less than the sum of the heat gains of a building if building thermal insulation is sufficient. Currently, the whole amount of heat gains is included into calculation without the evaluation of time parameters. No limit conditions are specified in order to define surplus heat flows and the amount of heat flows

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Šiupšinskas, Giedrius, and Solveiga Adomėnaitė. "MULTI-CRITERIA ANALYSIS OF ALTERNATIVE ENERGY SUPPLY SOLUTIONS TO PUBLIC NEARLY ZERO ENERGY BUILDINGS / BEVEIK NULINIO ENERGIJOS BALANSO VISUOMENINIŲ PASTATŲ APRŪPINIMO ENERGIJA SPRENDIMAI, DAUGIAKRITERĖ ANALIZĖ." Mokslas - Lietuvos ateitis 5, no. 4 (2013): 435–41. http://dx.doi.org/10.3846/mla.2013.68.

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The article analyzes energy supply alternatives for modernised public nearly zero energy buildings. The paper examines alternative energy production systems such as heat pumps (air-water and ground-water), solar collectors, adsorption cooling, biomass boiler, solar photovoltaic, wind turbines and combinations of these systems. The simulation of the analysed building energy demand for different energy production alternatives has been performed using TRNSYS modelling software. In order to determine an optimal energy supply variant, the estimated results of energy, environmental, and economic eva

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Rogoža, Artur. "LIFE CYCLE MULTI-CRITERIA ANALYSIS OF ALTERNATIVE ENERGY SUPPLY SYSTEMS FOR A RESIDENTIAL BUILDING / ALTERNATYVIŲJŲ DAUGIABUČIO NAMO APRŪPINIMO ENERGIJA SISTEMŲ GYVAVIMO CIKLO DAUGIAKRITERĖ ANALIZĖ." Mokslas - Lietuvos ateitis 5, no. 4 (2013): 423–28. http://dx.doi.org/10.3846/mla.2013.66.

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The article analyses energy supply alternatives for a partially renovated residential building. In addition to the existing district heating (base case) alternative systems, gas boilers, heat pumps (air-water and ground-water), solar collectors, solar cells, and combinations of these systems have been examined. Actual heat consumption of the building and electricity demand determined by the statistical method are used for simulating the systems. The process of simulation is performed using EnergyPro software. In order to select an optimal energy supply option, the life cycle analysis of all sy

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Medineckienė, Milena, and Folke Björk. "OWNER PREFERENCES REGARDING RENOVATION MEASURES – THE DEMONSTRATION OF USING MULTI-CRITERIA DECISION MAKING / SAVININKŲ TEIKIAMI PRIORITETAI PASTATŲ ATNAUJINIMO PRIEMONĖMS: DAUGIAKRITERINIŲ SPRENDIMO PRIĖMIMO METODŲ TAIKYMO PAVYZDYS." Journal of Civil Engineering and Management 17, no. 2 (2011): 284–95. http://dx.doi.org/10.3846/13923730.2011.582380.

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The article describes typical apartment buildings built in Swedish residential areas in the ‘50s, ‘60s and 70's. Each of these buildings included calculations on the effects and investment cost of a number of renovation measures aimed at improving energy efficiency. By applying multi-criteria decision making methods Simple Additive Weighting (SAW), Multiplicative Exponential Weighting (MEW) and Complex Proportion Assessment (COPRAS), the preferences of building owners regarding renovation measures were studied. The study highlighted four important criteria, including the use of energy from dis

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Sirvydas, Algimantas, Vidmantas Kučinskas, Paulius Kerpauskas, Jūratė Nadzeikienė, and Albinas Kusta. "SOLAR RADIATION ENERGY PULSATIONS IN A PLANT LEAF." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 18, no. 3 (2010): 188–95. http://dx.doi.org/10.3846/jeelm.2010.22.

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Solar radiation energy is used by vegetation, which predetermines the existence of biosphere. The plant uses 1–2% of the absorbed radiant energy for photosynthesis. All the remaining share of the absorbed energy, accounting for 99–98%, converts into thermal energy in the plant leaf. At the lowest wind under natural surrounding air conditions, plant leaves change their position with respect to the Sun. An oscillating plant leaf receives a variable amount of solar radiation energy, which causes changes in the balance of plant leaf energies and a changing emission of heat in the leaf. The analysi

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Žėkas, Vygantas, and Vytautas Martinaitis. "Realiai veikiančio šilumos siurblio efektyvumo tyrimas." Mokslas - Lietuvos ateitis 1, no. 1 (2011): 68–71. http://dx.doi.org/10.3846/mla.2009.1.19.

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Nagrinėjamas tipinis šilumos siurblys, sumontuotas renovuotame name, esančiame Vilniaus priemiestyje (175 m2 gyvenamojo ploto). Pastate įrengta grindinė šildymo sistema, įdiegta vėdinimo sistema su šilumogrąžos įrenginiu. Pagrindinis šilumos generatorius yra šilumos siurblys, o jo generuojama šiluma paskirstoma trimis atšakomis – grindinio šildymo, vėdinimo kameros ir karšto vandens ruošimo. Šilumos siurblio šilumos energijos gamybos efektyvumą galima apibūdinti naudingumo koeficientu (COP – coefficient of performance) ir sezoniniu naudingumo faktoriumi (SPF – season performance factor). Preli

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Pakalka, Saulius, Kęstutis Valančius, Giedrė Streckienė, and Vaidvilė Ulbikaitė. "FAZINIO VIRSMO MEDŽIAGOS CHARAKTERISTIKŲ ŠILUMOS KAUPIKLYJE SKAITINIS MODELIAVIMAS / SIMULATION OF THE PHASE CHANGE MATERIALS’ CHARACTERISTICS IN A THERMAL ENERGY STORAGE." Mokslas - Lietuvos ateitis 10 (July 5, 2018): 1–7. http://dx.doi.org/10.3846/mla.2018.3225.

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In order to use efficiently residual, waste or renewable energy, the application of phase change materials (PCM) grows in building energy systems. At the same time, this poses new technological challenges in choosing specific materials, system design solutions, because it requires a specific knowledge of the heat transfer process during the phase change. The aim of the work is to investigate the heat transfer in a PCM based thermal energy storage unit using the COMSOL Multiphysics software. In the analysis, the properties of the material were evaluated during the phase change. This allowed to

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Stankevičius, Vytautas, and Jūratė Karbauskaitė. "THE BACKGROUND REQUIREMENTS FOR BUILDING HEAT LOSSES/ŠILUMOS NUOSTOLIŲ PASTATUOSE NORMAVIMAS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 4, no. 3 (1998): 185–90. http://dx.doi.org/10.3846/13921525.1998.10531402.

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Nauji reikalavimai pastatų šilumos izoliacijai Lietuvoje buvo patvirtinti jau 1992 m. Naujajame reglamente “Pastatų atitvarų šiluminė technika” atitvarų normines šilumos perdavimo koeficientę vertės buvo pagrįstos energijos sąnaudų analize per tam tikrą pastato naudojimo laikotarpį, nustatant minimalias šių sąnaudų vertes įvairioms konstrukcijų rūšims. Atsižvelgiant į šias sąnaudas, optimali gyvenamųjų namų stogo atitvaros šilumos perdavimo koeficiento verte būtų 0,18 W/(m2·K), išorinių sienų 0,26 W/(m2·K), langų ir durų—1,9 W/(m2·K). Mažiausiai imlios energijai pasirodė skydinės karkasinės ko

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Kozlovska-Kędziora, Justyna, and Egidijus Petraitis. "THE POSSIBILITIES OF USING SAPROPEL FOR BRIQUETTE PRODUCTION / SAPROPELIO PANAUDOJIMO GALIMYBĖS BRIKETAMS GAMINTI." Mokslas - Lietuvos ateitis 3, no. 5 (2011): 24–30. http://dx.doi.org/10.3846/mla.2011.082.

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This article describes the possibilities of using renewable energy fuel sources for the purpose of producing thermal energy. One of the options (alternatives) is to use sapropel (lake sediment biomass) not only as a fertilizer, feed additive, binder etc. but also as an energy fuel. One of the first steps to material extraction and preparation is fuel briquette (direct extraction of useful heat) production, technology and methodology. The article compares the author’s findings with analytical and experimental results obtained by other scientists. Santrauka Straipsnyje pateiktos atsinaujinančių

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Savickas, Romanas, Lauryna Savickienė, and Juozas Bielskus. "TECHNICAL MEASURES TO DECREASE HEAT ENERGY CONSUMPTION OF FINAL CUSTOMER IN MULTI-APARTMENT BUILDINGS ACCORDING TO ENERGY EFFICIENCY DIRECTIVE / TECHNINĖS PRIEMONĖS, SKIRTOS MAŽINTI GALUTINIO VARTOTOJO ŠILUMINĖS ENERGIJOS VARTOJIMĄ DAUGIABUČIUOSE GYVENAMU." Mokslas – Lietuvos ateitis 7, no. 4 (2015): 461–67. http://dx.doi.org/10.3846/mla.2015.822.

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Energy consumption in the world increases, so the measures in order to improve energy efficiency must be found. The aim of 2012/27/EU Energy Efficiency Directive targets is to decrease energy consumption for a final energy consumer by 1.5% every year, but there is no definition how these targets could be achieved by an individual member state. This article presents the analysis how these targets could be achieved by the means of individual heat metering by heat cost allocators for every flat thus decreasing an energy consumption for a final consumer. Statistical analysis of identical buildings

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Monstvilas, Edmundas. "OPTIMAL INSULATION OF DISTRICT HEATING PIPELINES/OPTIMALUS ŠILUMINIŲ TRASŲ APŠILTINIMAS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 4, no. 3 (1998): 178–84. http://dx.doi.org/10.3846/13921525.1998.10531401.

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Daugelis Lietuvoje esančių šilumos tiekimo tinklų sumontuoti pagal 1988 m. normas SNiP 2.04.14–88 [1]. Formaliai šios normos galioja ir dabar. Jose minimos šilumos izoliuojamosios medžiagos yra gerokai blogesnių savybių, negu naudojamos dabar. Be to, nuo 1998 m. pasikeite šiluminės energijos ir medžiagų kainos, kurios tiesiogiai veikia ekonomiškai tikslingą izoliacijos storį. Todėl tyrimų tikslas buvo šis: įvertinant šilumos tiekimo trasų įrengimo ir eksploatacijos energijos ir finansines sąnaudas, nustatyti įvairių tipų trasų optimalias vamzdynų apšiltinimo šilumines varžas, apskaičiuoti opti

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Kriptavičius, Dalius, Petras Urbonas, and Genrika Rynkun. "Buitinių atliekų naudojimo energijai gaminti galimybių analizė." Mokslas - Lietuvos ateitis 1, no. 1 (2011): 38–41. http://dx.doi.org/10.3846/mla.2009.1.10.

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Tyrimo tikslas – nustatyti buitinių atliekų naudojimo perspektyvas Lietuvoje, prognozuojant buitinių atliekų susidarymo tempus, surinkimą ir analizuojant jų deginimo galimybes energijai gaminti, vadovaujantis ekonominiais, ekologiniais ir socialiniais kriterijais. Ekonominis vertinimas atliekamas pagal 3 kriterijus: 1) šiukšlių deginimo stoties technologinė kaina, Lt/kW; 2) investicijos, generuojamos energijos vienetui, Lt/MWh; 3) išlaidos dujoms tokiam pačiam kiekiui energijos pagaminti, Lt. Ekologinis įvertinimas atliekamas pagal sudeginto kuro kiekio ir išsiskyrusių teršalų santykį. Sociali

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Juršėnaitė, Laura, and Violeta Motuzienė. "BIURO PATALPOS ŠILUMOS PRITEKIŲ TYRIMAS / INVESTIGATION OF HEAT GAINS IN AN OFFICE." Mokslas - Lietuvos ateitis 10 (July 5, 2018): 1–6. http://dx.doi.org/10.3846/mla.2018.3343.

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Increasing the energy efficiency of buildings, heat losses through envelope and infiltration become very low, therefore, the proportion of the heat gains in the heat balance of the building increases. Due to their abundance of computer equipment, intensive lighting and the abundance of employees the information technologies’ (IT) staff offices are characterized by high internal heat gains. Formally, such offices are not distinguished when designing the building and its energy performance, values of internal heat gains are the same as for usual offices. Insufficient attention to the detailed di

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Barkauskas, Vytautas. "CRITERIA OF ADEQUACY FOR BUILDING THERMAL BEHAVIOUR/PASTATŲ GRUPAVIMAS PAGAL ŠILUMINĖS BŪSENOS KRITERIJUS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 4, no. 3 (1998): 173–77. http://dx.doi.org/10.3846/13921525.1998.10531400.

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Statybinės normos (RSN 143–92/94) reglamentuoja leistinas atitvarų šilumos perdavimo koeficientų vertes. Tačiau net ir nustačius visoms atitvaroms vienodas šilumos perdavimo koeficiento vertes, atskirų pastatų savitieji šilumos nuostoliai šildomojo ploto ar tūrio atžvilgiu iš esmės skiriasi. Šis skirtumas svyruoja nuo 1,3 iki 2,7 karto. Tai dideli skaičiai. Empiriškai ir analitiškai nustatyta, kad yra du kriterijai, kurie leidžia gana tiksliai klasifikuoti pastatus į 8 grupes pagal jų šiluminės būklės ir savitųjų šilumos nuostolių panašumą. Vienas iš jų ( Ke ) rodo pastatų atitvarų matmenų san

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Šiupšinskas, Giedrius, and Solveiga Adomėnaitė. "THE USE OF SOLAR ENERGY FOR PREPARING DOMESTIC HOT WATER IN A MULTI-STOREY BUILDING / SAULĖS ENERGIJOS PANAUDOJIMAS KARŠTAM VANDENIUI RUOŠTI DAUGIABUČIAME NAME." Mokslas - Lietuvos ateitis 5, no. 4 (2012): 507–12. http://dx.doi.org/10.3846/mla.2012.81.

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The article analyses the possibilities of solar collectors used for a domestic hot water system and installed on the roofs of modernized multi-storey buildings under the existing climate conditions. A number of combinations of flat plate and vacuum solar collectors with accumulation tank systems of various sizes have been examined. Heat from the district heating system is used as an additional heat source for preparing domestic hot water. The paper compares calculation results of energy and economy regarding the combinations of flat plate and vacuum solar collectors and the size of the accumul

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Jonynas, Rolandas, Rokas Valančius, and Vykintas Šuksteris. "Realus šilumos siurblio sezoninis energijos transformacijos koeficientas." Mokslas - Lietuvos ateitis 1, no. 1 (2011): 35–37. http://dx.doi.org/10.3846/mla.2009.1.09.

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Žemo potencialo energijos (žemės, vandens, oro) naudojimas pastatams šildyti ir karštam vandeniui ruošti – labai aktualus šių dienų klausimas. Tyrimo objektu pasirinktas individualus gyvenamasis namas Kauno rajone. Pastatas yra vieno aukšto,140 m2 šildomo ploto, 180 m2 bendro ploto. Tyrimas buvo atliekamas tiesioginio matavimo metodu, naudojant apskaitos prietaisus. Pastatui šildyti ir karštam vandeniui ruošti suprojektuotas ir įrengtas dirva/vanduo tipo šilumos siurblys, kurio deklaruojama šiluminė galia, esant grindų šildymo sistemai (veikiančiai 35/25 °C režimu), yra 11 kW, elektrinė galia

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Streckienė, Giedrė, and Salomėja Bagdonaitė. "MODELLING THE SIZE OF SEASONAL THERMAL STORAGE IN THE SOLAR DISTRICT HEATING SYSTEM / SEZONINĖS ŠILUMOS AKUMULIACINĖS TALPYKLOS TŪRIO MODELIAVIMAS CENTRALIZUOTOJE SAULĖS ŠILDYMO SISTEMOJE." Mokslas - Lietuvos ateitis 5, no. 4 (2012): 499–506. http://dx.doi.org/10.3846/mla.2012.80.

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The integration of a thermal storage system into the solar heating system enables to increase the use of solar thermal energy in buildings and allows avoiding the mismatch between consumers’ demand and heat production in time. The paper presents modelling a seasonal thermal storage tank various sizes of which have been analyzed in the district solar heating system that could cover a part of heat demand for the district of individual houses in Vilnius. A biomass boiler house, as an additional heat source, should allow covering the remaining heat demand. energyPRO software is used for system mod

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Valančius, Kęstutis, and Jonas Grigaliūnas. "ANALYSIS OF SOLAR ENERGY USE FOR MULTI-FLAT BUILDINGS RENOVATION / SAULĖS ENERGIJOS PANAUDOJIMO MODERNIZUOJAMUOSE DAUGIABUČIUOSE ANALIZĖ." Mokslas – Lietuvos ateitis 8, no. 4 (2016): 449–54. http://dx.doi.org/10.3846/mla.2016.941.

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The paper analyses the energy and financial possibilities to install renewable energy sources (solar energy) generating systems when renovating multi-flat buildings. The aim is to analyse solar energy system possibilities for modernization of multi-flat buildings (5-storey, 9-storey and 16-storey), providing detailed conclusions about the appropriateness of the energy systems and financial aspects. It is also intended to determine the optimal technological combinations and solutions to reach the maximum energy benefits. For the research computer simulation tools “EnergyPRO” and “PV*SOL Premium

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Vėjelis, Sigitas, Saulius Vaitkus, and Giedrius Balčiūnas. "STUDIES ON THE THERMAL CONDUCTIVITY OF COMPOSITE MATERIALS BASED ON LOCAL RENEWABLE RESOURCES / KOMPOZICINIŲ TERMOIZOLIACINIŲ MEDŽIAGŲ IŠ VIETINIŲ ATSINAUJINANČIŲ IŠTEKLIŲ ŠILUMOS LAIDUMO TYRIMAI." Mokslas - Lietuvos ateitis 3, no. 5 (2011): 83–88. http://dx.doi.org/10.3846/mla.2011.091.

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Thermal insulation materials produced from local renewable resources are increasingly used for two reasons – they are environmentally friendly and their manufacture requires less amount of energy. The most renewable resources include a wide variety of crop straw – barley, rye, wheat, triticale, etc. the thermal conductivity of which depends on their orientation to the product and structure of the same straw. For specimen composition, the straw stems of bulrush, reeds, bent and triticales were used, producing composites with the mass ratio of 1:1. The paper analyses the results of thermal condu

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Streckienė, Giedrė, and Elena Polonis. "ANALYSIS OF ENERGY DEMAND FOR LOW-ENERGY MULTI-DWELLING BUILDINGS OF DIFFERENT CONFIGURATION / SKIRTINGOS KONFIGŪRACIJOS MAŽAENERGIŲ DAUGIABUČIŲ PASTATŲ ENERGIJOS POREIKIŲ TYRIMAS." Mokslas – Lietuvos ateitis 6, no. 4 (2014): 414–20. http://dx.doi.org/10.3846/mla.2014.57.

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To meet the goals established by Directive 2010/31/EU of the European Parliament and of the Council on the energy performance of buildings, the topics of energy efficiency in new and old buildings must be solved. Research and development of new energy solutions and technology are necessary for increasing energy performance of buildings. Three low-energy multi-dwelling buildings have been modelled and analyzed in the presented study. All multi-dwelling houses are made of similar single-family house cells. However, multi-dwelling buildings are of different geometry, flat number and height. Desig

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Šalčiūnaitė, Brigita, and Ingrida Pliopaitė-Bataitienė. "FORECAST OF BIOGAS GENERATION IN LITHUANIAN REGIONAL LAND FILLS / LIETUVOS REGIONINIUOSE SĄVARTYNUOSE SUSIDARANČIO BIODUJŲ KIEKIO PROGNOZĖ." Mokslas – Lietuvos ateitis 7, no. 4 (2015): 392–98. http://dx.doi.org/10.3846/mla.2015.807.

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The amount of generated waste in Lithuania ranges from 35,000 tons to 261,865 tons per year. 35% of this quantity is biodegradable waste – i.e. about 27,830 tons/year. 75% of municipal waste in Lithuania is disposed in landfills. Such management of municipal waste is dangerous because of environmental pollution with the biogas and leachate, increased global greenhouse effect, and so on. From 1 ton of landfill waste it is possible to get about 10 m3 of landfill gas, after using it 13 kWh and 50 kWh of thermal energy could be made. There was presented in this article the estimated amount of biog

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Ruzgys, Audrius, Robertas Volvačiovas, and Česlovas Ignatavičius. "ANALYSIS OF ENERGY CONSUMPTION IN RENOVATED BUILDINGS AND SIMULATION OF THE PAYBACK PERIOD / ATNAUJINTŲ PASTATŲ ENERGIJOS SUVARTOJIMO ANALIZĖ IR ATSIPERKAMUMO MODELIAVIMAS." Mokslas - Lietuvos ateitis 5, no. 5 (2013): 513–19. http://dx.doi.org/10.3846/mla.2013.80.

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The renovation of old buildings is essential for the efficient useof energy. Improvement in the thermal characteristics of thebuilding envelope makes a significant effect on energy savings.For assessing the real impact on buildings, energy efficiencyof various measures applied in renovation is one of the mostimportant problems. Actual energy savings significantly differfrom those calculated according to the methodology described intechnical documents. The article analyses 8 renovated buildings.Three main external elements, including walls, windows androofs, in all buildings were retrofitted. U

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Samarin, Oleg, Kirill Lushin, Sabina Paulauskaitė, and Kęstutis Valančius. "INFLUENCE OF THE OUTSIDE CLIMATE PARAMETERS ON THE SELECTION OF THE OPTIMUM COMBINATION OF THE ENERGY SAVING MEASURES." Technological and Economic Development of Economy 15, no. 3 (2009): 480–89. http://dx.doi.org/10.3846/1392-8619.2009.15.480-489.

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In this paper the influence of climatic parameters of building region on expedient depth of implementation of different ways of energy consumption decrease in civil buildings is reviewed. The data of multivariate calculations of power and technological efficiency of an adopted complex of energy saving measures for reference climatic zones of the terrain of Russia in modern economic conditions with allowance for discounting of costs are adduced. The analysis of the obtained outcomes is given and the guidelines are also offered at the choice of optimum combination of the solutions on a decrease

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Biekša, Darius, Eglė Jaraminienė, and Vytautas Martinaitis. "EVALUATION OF REFURBISHMENT IN MULTI-FLAT BUILDINGS CONSIDERING TERNARY BENEFIT." Mokslas - Lietuvos ateitis 3, no. 5 (2011): 98–104. http://dx.doi.org/10.3846/mla.2011.093.

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Inefficient heat use in old multi-flat residential buildings causes problems to the residents spending a large part of their incomes on heat bills as well as for the State working towards achieving goals of energy efficiency increase, climate change mitigation and energy security. However, the Lithuanian program of multi-flat building renovation keeps stalling, and therefore danger that much of this energy saving potential will go unrealised appears. The paper is concerned with the problems that arise when renovating multi-flat buildings according to the existing legislation. In this case, the

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Bielskus, Juozas, Giedrius Šiupšinskas, Dovydas Rimdžius, Kęstutis Kuzminskas, and Šarūnas Gruzda. "ENERGY BALANCE EVALUATION OF INDUSTRIAL BUILDINGS WITH AN OFFICE COMPLEX / GAMYBINIO PASTATO SU ADMINISTRACINIU KORPUSU ENERGIJOS BALANSO TYRIMAS." Mokslas – Lietuvos ateitis 7, no. 4 (2015): 493–98. http://dx.doi.org/10.3846/mla.2015.828.

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While evaluating the energy savings potential in buildings of different function we face the energy balance of current situation evaluation problem. Generally the data of energy flows quantities and the nature of their dynamics are agregated and do not reflect the indicators of the achieved microclimate. Therefore this article analyses the energy balance following the example of one-year data collection analysis in a company’s building complex. The investigated problem is evaluated by the system analysis approach, i.e. the analysed object system is divided into separate subsystems which have b

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Užšilaitytė, Lina, and Vytautas Martinaitis. "SEARCH FOR OPTIMAL SOLUTION OF PUBLIC BUILDING RENOVATION IN TERMS OF LIFE CYCLE." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 18, no. 2 (2010): 102–10. http://dx.doi.org/10.3846/jeelm.2010.12.

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Climate change became a priority issue on the agenda of the energy and environmental policy of the European Union. Energy efficiency and renewable energy are the main pillars to cope with climate change. Buildings consuming 40% of final energy in the European Union play a vital role here. This is the reason for changing attitude towards evaluation of the benefits of the renovation of existing buildings. Previously before making a decision on building renovation solutions the main factor was cost‐efficiency. Today life‐cycle approach taking into account energy consumption and abatement of green

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Carlos, Jorge S., and Helena Corvacho. "RETROFIT MEASURES IN OLD ELEMENTARY SCHOOL BUILDINGS TOWARDS ENERGY EFFICIENCY." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 16, no. 4 (2010): 567–76. http://dx.doi.org/10.3846/jcem.2010.63.

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A study on thermal retrofit of Portuguese elementary school buildings is presented. The type of school under analysis is one adopted by a large construction campaign that began in the 1940's. This building stock has a very poor thermal performance and their retrofit was evaluated starting with a case study of a school in the central region of Portugal, where some experimental measures were performed and a calculation method was applied for the heating energy consumption estimation. A solution for the thermal retrofit of the school building external envelope was optimized and the effect on heat

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Blumberga, Dagnija, Edgars Vīgants, Ivars Veidenbergs, Ģirts Vīgants, and Valdis Vītoliņš. "ECO-INTENSITY ANALYSIS FOR A CHIP-FUELLED BOILER HOUSE / EKOLOGINIO INTESYVUMO NAMĄ ŠILDANT SKIEDROMIS ANALIZĖ." Journal of Environmental Engineering and Landscape Management 20, no. 4 (2012): 249–55. http://dx.doi.org/10.3846/16486897.2012.695737.

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The operational eco-intensity of a heat supply system is dependent upon the interaction of its elements and their common performance. It is of special importance to gain insight into possibilities to reduce chip fuel consumption in the case when an additional element – a gas condenser – is installed in a boiler house. The efficiency of a system's operation is estimated by its eco-intensity; such estimates concern the influence exerted by technological parameters on the reduction in natural resource consumption, allowing this problem to be thoroughly analysed by means of definite factors promot

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Latvytė, Ernesta, and Raimonda Martinkutė-Kaulienė. "APPLICATION OF AIR DERIVATIVE FINANCIAL INSTRUMENTS IN LITHUANIAN ECONOMY." Mokslas - Lietuvos ateitis 12 (August 13, 2020): 1–9. http://dx.doi.org/10.3846/mla.2020.12510.

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The paper explores the concept of weather derivatives: what it is, what its features are, and in what areas they can be applied. It has been established that there can be several types of weather derivative instruments – options and swaps. The use of weather derivatives has also been found to be very broad and attractive for tourism, construction, agriculture and heating companies. Companies operating in Lithuania do not use weather derivatives, although they do provide insurance against the risks associated with adverse weather conditions. The paper is conducting a study to determine which he

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Turskis, Zenonas, Marius Lazauskas, and Edmundas Kazimieras Zavadskas. "FUZZY MULTIPLE CRITERIA ASSESSMENT OF CONSTRUCTION SITE ALTERNATIVES FOR NON-HAZARDOUS WASTE INCINERATION PLANT IN VILNIUS CITY, APPLYING ARAS-F AND AHP METHODS / STATYBVITĖS PARINKIMO NEPAVOJINGŲ ATLIEKŲ DEGINIMO ĮMONEI VILNIUJE VARIANTŲ VERTINIMAS AHP IR ARAS-F METODAIS." Journal of Environmental Engineering and Landscape Management 20, no. 2 (2012): 110–20. http://dx.doi.org/10.3846/16486897.2011.645827.

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Continuous increase in electricity and heat prices for citizens necessitates new alternative solutions regarding rational application of existing resources, in order to minimize electric energy production costs. The article presents the description of waste incineration plant siting issue, related to satisfaction of requirements formulated by investors, citizens, contractors and other concerned parties. As the siting process represents fulfilment of the above-stated stakeholder requirements, the multiple criteria task is defined. Seven local assessments of alternative sites located in densely

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Sirvydas, Algimantas Povilas, Vidmantas Kucinskas, Paulius Kerpauskas та Juratė Nadzeikienė. "THEORETICAL MODELING OF TEMPERATURE PULSATIONS IN PLANT LEAF WHICH ARE CAUSED BY LEAF SWING WITH RESPECT TO THE SUN / LOKALIŲ AUGALO TEMPERATŪROS PULSACIJŲ, KURIAS SUKELIA LAPO SVYRAVIMAI SAULĖS ATŽVILGIU, TEORINIS MODELIAVIMAS / ТЕОРЕТИЧЕСКОЕ МОДЕЛИРОВАНИЕ ЛОКАЛЬНЫХ ПУЛЬСАЦИЙ ТЕМПЕРАТУРЫ,ВЫЗЫВАЕМЫХ КОЛЕБАНИЕМ ЛИСТ AРАСТЕНИЯО ТНОСИТЕЛЬНО CОЛНЦА". Journal of Environmental Engineering and Landscape Management 19, № 3 (2011): 251–59. http://dx.doi.org/10.3846/16486897.2011.606174.

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The plant leaf temperature is a result of biological processes occurring in an organ of the plant and its energy exchange with the environment. The plant leaf temperature always differs from the ambient temperature except for the moments of transition from a positive to a negative (or vice versa) temperature gradient. It is determined that the plant leaf temperature continuously changes during the sunny time of the day. Temperature pulsations emerge in plant tissues when the leaf naturally changes its position with respect to the Sun (e.g. impacted by the wind) during the sunny period of the d

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Raslanas, Saulius, and Jurgita Alchimovienė. "ASSESSMENT OF THE SUSTAINABILITY OF THE RENOVATION OF MULTI-APARTMENT BUILDINGS IN RESIDENTIAL AREAS / DAUGIABUČIŲ NAMŲ LIETUVOJE ATNAUJINIMO DARNUMO ĮVERTINIMAS." Engineering Structures and Technologies 4, no. 4 (2013): 145–54. http://dx.doi.org/10.3846/2029882x.2012.748259.

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The majority of Lithuanian multi-apartment residential buildings were built before 1993. Moreover, projects of housing renovation and maintenance have not been carried out before 1996. Lack of proper maintenance led to a significant deterioration of multi-apartment buildings. Most of these buildings are neither economic, nor environmentally-friendly and consume a significant amount of heat energy. Six major construction requirements should be satisfied when designing or refurbishing a building. Sustainable renovation of multi-apartment buildings and their environment is a universally recognize

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Lebedevas, Sergejus, Galina Lebedeva та Kristina Bereišienė. "MODIFYING MATHEMATICAL MODELS FOR CALCULATING OPERATIONAL CHARACTERISTICS OF DIESEL ENGINES BURNING RME BIOFUELS / MATEMATINIŲ MODELIŲ PRITAIKYMAS DYZELIŲ, DIRBANČIŲ RME BIODEGALAIS, DARBO PROCESUI IR EKSPLOATACINIAMS RODIKLIAMS SKAIČIUOTI / ДОРАБОТКА МАТЕМАТИЧЕСКИХ МОДЕЛЕЙ РАСЧЕТА ПОКАЗАТЕЛЕЙ РАБОТЫ ДИЗЕЛЯ НА БИОДИЗЕЛИНАХ РРМЭ". TRANSPORT 26, № 1 (2011): 50–60. http://dx.doi.org/10.3846/16484142.2011.561528.

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The article considers and solves the problems of adapting the mathematical models, used in calculating operational characteristics of diesel engines burning mineral diesel oil, to engines converted to RME biofuels. The analysis of mathematical models of calculating the main technical and economic characteristics of diesel engines as well as the parameters of the in-cylinder process and the concentration of toxic substances in the exhaust gases is performed. The need for adjusting the calculation algorithms is also demonstrated. The computer programs based on single-zone thermodynamic models ar

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Černeckienė, Jurgita, and Tadas Ždankus. "Vėjo energijos panaudojimo šilumos gamybai, taikant hidraulinę sistemą, tyrimas." Energetika 61, no. 1 (2015). http://dx.doi.org/10.6001/energetika.v61i1.3094.

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Vėjo energiją naudojant pastatams šildyti galima ženkliai sumažinti kuro sąnaudas, o tuo pačiu ir aplinkos taršą. Vėjo mechaninės energijos transformavimas į šilumą nėra naujovė, tačiau dabar labiausiai paplitusios elektrinės sistemos, kai vėjaratis suka elektros generatorių, o šiluma pastate gaunama naudojant elektrinius šildytuvus. Daugiau generuojamos šilumos ir mažesnes investicijas galima būtų pasiekti vietoje elektrinės naudojant hidraulinę šilumos generavimo sistemą. Eksperimentinių tyrimų stende hidraulinės sistemos pagrindinės dalys buvo: krumpliaratinis siurblys, reguliuojamasis vent

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Sirvydas, Povilas Algimantas, Albertas Skurvydas, Jūratė Nadzeikienė, and Saulė Sipavičienė. "Odos temperatūros virš dirbančio raumens kitimo dėsningumai." Baltic Journal of Sport and Health Sciences 1, no. 55 (2018). http://dx.doi.org/10.33607/bjshs.v1i55.669.

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Visos energijos rūšys, tarp jų biologinė ir mechaninė, galiausiai virsta šiluma. Fizinio krūvio metu šiluma išsiskiria žmogaus organizme, veikdama energijos balansą, ir pasireiškia lokaliu temperatūros padidėjimu. Lokalus temperatūros padidėjimas dirbančiuose raumenyse paklūsta termodinamikos dėsniams. Straipsnyje analizuojami odos virš dirbančio raumens temperatūros kitimo dėsningumai. Pagal raumens šilumos balansą nustatyta, kaip odos temperatūros kitimas priklauso nuo tarpusavyje susijusių vidinių ir išorinių veiksnių, sudaryta odos temperatūros pokyčio diferencinė lygtis. Atlikti odos temp

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BURLAKOVAS, Andrejus, and Vladislovas KATINAS. "Atliekinės šilumos energijos utilizavimas, naudojant organinį Renkino ciklą, elektros energijai gaminti." Energetika 57, no. 2 (2011). http://dx.doi.org/10.6001/energetika.v57i2.2067.

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Štreimikienė, Dalia, Asta Mikalauskienė, and Giedrius Širvys. "Energijos vartojimo efektyvumo didinimo skatinimas Lietuvoje." Ekonomika 76 (December 1, 2006). http://dx.doi.org/10.15388/ekon.2006.17593.

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Straipsnyje susisteminami Lietuvoje taikomi įvairūs instrumentai, skirti energijos vartojimo efektyvumui didinti. Šie skatinimo arba valstybės intervencijos į rinkas instrumentai yra būtini, norint įveikti rinkos ydas ir kliūtis, stabdančias energijos vartojimo efektyvumo didinimo priemonių plėtrą. Energijos vartojimo efektyvumas straipsnyje yra traktuojamas kaip taupus visų energijos nešiklių (tiek kuro, skirto energijai gaminti, tiek elektros, šilumos ir kt. energijos formų) vartojimas. Straipsnio tikslas - išanalizuoti Lietuvoje šiuo metu taikomus skatinimo instrumentus, skirtus energijos v

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KARBAUSKAITĖ, Jūratė, and Eugenijus PEREDNIS. "Kačerginės vaikų sanatorijos šilumos energijos vartojimo mažinimo galimybės." Energetika 57, no. 1 (2011). http://dx.doi.org/10.6001/energetika.v57i1.2040.

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