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A potential solution for thermal imbalance of ground source heat pump systems in cold regions: Ground source absorption heat pump
Wu, Wei; Wang, Baolong; You, Tian; Shi, Wenxing; Li, … - In: Renewable Energy 59 (2013) C, pp. 39-48
Ground Source Heat Pumps (GSHPs) are extensively used as renewable energy technology over the world. In heating …-dominated buildings, the ground thermal imbalance leads to the decrease of the soil temperature and deteriorates the heating performance … higher than that of GSEHP. For buildings with heating load only, the average soil temperature of GSAHP can be 4–6°C higher …
Persistent link: https://www.econbiz.de/10011045136
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The effect of temperature mismatch on thermoelectric generators electrically connected in series and parallel
Montecucco, Andrea; Siviter, Jonathan; Knox, Andrew R. - In: Applied Energy 123 (2014) C, pp. 47-54
The use of thermoelectric generators (TEGs) to recover useful energy from waste heat has increased rapidly in recent years with applications ranging from microwatts to kilowatts. Several thermoelectric modules can be connected in series and/or parallel (forming an array) to provide the required...
Persistent link: https://www.econbiz.de/10010789869
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Comparison of energy efficiency assessment methods: Case Bio-SNG process
Kohl, T.; Laukkanen, T.; Tuomaala, M.; Niskanen, T.; … - In: Energy 74 (2014) C, pp. 88-98
The goal of biofuel production is to partially replace fossil fuels in energy generation and transport. For the evaluation of biofuel production processes different criteria are applied and usually they include costs, efficiency aspects and emissions. However, evaluation of the energy efficiency...
Persistent link: https://www.econbiz.de/10011055392
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Thermal and sanitary performance of domestic hot water cylinders: Conflicting requirements
Armstrong, Peter M.; Uapipatanakul, Meg; Thompson, Ian; … - In: Applied Energy 131 (2014) C, pp. 171-179
, microbial samples were taken from the bottom of 10 UK domestic electric hot water tanks whose heating elements are connected to … concentrations remained high in spite of the application of seven hours of heating during off-peak hours. Further numerical and … conditions throughout standard domestic hot water tanks without significantly increasing the heating element temperature or …
Persistent link: https://www.econbiz.de/10010906301
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Optimal electricity dispatch on isolated mini-grids using a demand response strategy for thermal storage backup with genetic algorithms
Neves, Diana; Silva, Carlos A. - In: Energy 82 (2015) C, pp. 436-445
The present study uses the DHW (domestic hot water) electric backup from solar thermal systems to optimize the total electricity dispatch of an isolated mini-grid. The proposed approach estimates the hourly DHW load, and proposes and simulates different DR (demand response) strategies, from the...
Persistent link: https://www.econbiz.de/10011209575
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Design and exergy analysis of solar roofs: A viable solution with esthetic appeal to collect solar heat
Fiaschi, Daniele; Bertolli, Alberto - In: Renewable Energy 46 (2012) C, pp. 60-71
Application of a pipeline at the lower side of copper roofs to use them as solar collectors was investigated. An optimized module capable of converting a wide fraction of solar radiation into heat, and at the same time preserving the esthetic quality of the roof, was designed. Exergy analysis,...
Persistent link: https://www.econbiz.de/10010807170
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Measurements of household electricity and domestic hot water use in dwellings and the effect of different monitoring time resolution
Bagge, Hans; Johansson, Dennis - In: Energy 36 (2011) 5, pp. 2943-2951
The use of household electricity and domestic hot water has been measured for 72 apartments in an apartment building located in the south of Sweden. The measurements were carried out with samples every 6s, a tenfold increase in resolution compared to available published data, during a...
Persistent link: https://www.econbiz.de/10010809699
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A method for the dynamic testing and evaluation of the performance of combined solar thermal heat pump hot water systems
Panaras, G.; Mathioulakis, E.; Belessiotis, V. - In: Applied Energy 114 (2014) C, pp. 124-134
In the present work, a method is proposed for the testing and evaluation of the performance of combined solar thermal heat pump hot water systems. The method is based on the Dynamic System Testing (DST) method for solar thermal systems. The evaluation of the system performance requires the...
Persistent link: https://www.econbiz.de/10010729377
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Domestic hot water storage: Balancing thermal and sanitary performance
Armstrong, P.; Ager, D.; Thompson, I.; McCulloch, M. - In: Energy Policy 68 (2014) C, pp. 334-339
Thermal stratification within hot water tanks maximises the availability of stored energy and facilitates optimal use of both conventional and renewable energy sources. However, stratified tanks are also associated with the proliferation of pathogenic bacteria, such as Legionella, due to the...
Persistent link: https://www.econbiz.de/10010753216
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Economic optimization of low-flow solar domestic hot water plants
Cardinale, N.; Piccininni, F.; Stefanizzi, P. - In: Renewable Energy 28 (2003) 12, pp. 1899-1914
A solar plant for hot-water production was investigated by the dynamic simulation code (TRNSYS). A typical daily home consumption for a 4 persons family was considered. The hot-water demand temperature (53 °C) is controlled by a conventional fuel auxiliary heater and a tempering valve. A...
Persistent link: https://www.econbiz.de/10011045442