Energy and exergy analyses of space heating in buildings

Yildiz, Abdullah; Güngör, Ali

doi:10.1016/j.apenergy.2008.12.010

Cited by 101 publications

(36 citation statements)

References 22 publications

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“…Although heating load calculations and energy-wise analyses are necessary for system dimensioning, they are not sufficient since energy analyses cannot quantitatively clarify the effects of working temperature levels. Several studies have documented that energy analyses alone are not sufficient to completely understand energy use [1], [2], [3]. Exergy analysis can be used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Exergy performance of different space heating systems: A theoretical study

Kazanci

Shukuya

Olesen

2016

Building and Environment

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Three space heating systems (floor heating with different floor covering resistances, radiator heating with different working temperatures, warm-air heating with and without heat recovery) were compared using a natural gas fired condensing boiler as the heat source. For the floor heating systems, the effects of floor covering resistance on the whole system performance were studied using two heat sources; a natural gas fired condensing boiler and an air-source heat pump. The heating systems were also compared in terms of auxiliary exergy use for pumps and fans.The low temperature floor heating system performed better than other systems in terms of exergy demand. The use of boiler as a heat source for a low-exergy floor heating system creates a mismatch in the exergy supply and demand. Although an air-source heat pump could be a better heat source, this depends on the origin of the M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 electricity supplied to the heat pump. The coefficient of performance (COP) of the heat pump has a critical value (2.57 in this study); it is beneficial to use a heat pump instead of a boiler only when the COP is above this critical value.The floor covering resistance should be kept to a minimum, in order not to hinder the performance of the floor heating and the whole system. The exergy input to auxiliary components plays a significant role in the overall exergy performance of systems, and its effects become even more significant for low temperature heating systems.

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Section: Introductionmentioning

confidence: 99%

Exergy performance of different space heating systems: A theoretical study

Kazanci

Shukuya

Olesen

2016

Building and Environment

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“…There are many studies in the literature dealing with energy analysis in buildings [6], but limited research has been published thus far on evaluate environmental impacts using Life Cycle Assessment (LCA) tool on the operational energy in the life cycle of residential dwellings for developing countries in Latin America, although some of the first attempts have started to appear during the last 5 years [7,8]. Furthermore, in developed countries some others LCAs studies for operational energy of residential dwellings were performed in the following studies: Sartori and Hestnes [9] performed a literature survey on buildings' life cycle energy use of 60 cases from nine countries.…”

Section: Introductionmentioning

confidence: 99%

Operational energy in the life cycle of residential dwellings: The experience of Spain and Colombia

2010

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“…Various results about patterns of human exergy consumption in relation to various heating and cooling systems were given by Saito and Sukaya (2001). Conclusions were made about the inadequacy of the energy conservation concept for understanding important aspects of energy utilization processes by Yildiz and Gungör (2009). The second-law analysis is important for an efficient utilization of the available resources.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and thermoeconomic analysis of combined geothermal space heating and thermal storage using phase change materials

Chauhan

Ragnarsson

2015

Geoth. Energ. Sci.

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Abstract. The present work discusses the utilization of phase change materials for energy storage in geothermal space heating systems. Thermodynamics and thermoeconomics of the combined heating and thermal storing system were studied to show the scope of energy storage and cost savings. A computational model of the combined space heating and thermal storage system was developed and used to perform thermodynamic studies of the heat storage process and heating system efficiency at different times and ambient temperatures. The basis for these studies is daily variations in heating demand that is higher during the night than during the day. The results show the scope of the utilization of phase change material for low ambient temperature conditions. Under proper conditions a sufficient amount of exergy is stored during the charging period at a low ambient temperature to fulfill the daytime heat load requirement. Under these conditions the cost flow rate of exergy storage is found to be lower than the radiator heating cost flow rate. Thus, the use of exergy storage at low ambient temperatures for heating at higher ambient temperatures makes a significant contribution to cost savings.

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Energy and exergy analyses of space heating in buildings

Cited by 101 publications

References 22 publications

Exergy performance of different space heating systems: A theoretical study

Exergy performance of different space heating systems: A theoretical study

Operational energy in the life cycle of residential dwellings: The experience of Spain and Colombia

Thermodynamic and thermoeconomic analysis of combined geothermal space heating and thermal storage using phase change materials

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