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Theses

Étude de la possibilité de récupération de chaleur par voie thermodynamique pour la réhabilitation des maisons individuelles

Abstract : An air-to-air heat pump performs poorly at low ambient temperatures, and its performance decreases in the coldest part of winter when the heating load is greater. Both the COP and the heating capacity of the system decrease as the outdoor temperature decreases. Auxiliary resistance heaters must then be used as back up, reducing the overall performance of the system. Moreover, defrost cycles are necessary in a specific range of outdoor conditions, lowering the heat pump performance. This is of particular interest for electricity utilities, because peak loads generally coincide with the coldest ambient temperatures. Attempts to improve the heat pump efficiency and to reduce the peak-loading problem have led to the coupling of heat pumps with milder temperature air. Different components of a building envelope can contribute to increase the heat pump's heat-source temperature, as for instance sunspaces or attics, and to some extent crawlspaces and earth-to-air heat exchangers. Other sources such as the exhaust air of a ventilation system can be used to preheat the heat pump air-source. This allows the heat pump to operate in more favourable conditions, with a higher efficiency and a higher sink-source temperature adapted to the heat production needed in dwellings retrofit. A global approach is needed to explore the energy potential of such combination and evaluate the relevance of coupling an air-source heat pump with milder air sources from the building environment. Ambient conditions and solar energy both influence the heating load and the air-source temperature that interact directly with the heat pump running conditions and performance. Besides, the heat pump running conditions, and particularly the air flow rate conditions needed at the outdoor unit, interacts directly with the air flow rate of the milder source, influencing the building heating load. The different models of air sources and heat pumps are presented. Then, different coupling configurations are studied in the case of a typical French dwelling, and typical climates.
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https://pastel.archives-ouvertes.fr/pastel-00005944
Contributor : Ecole Mines Paristech <>
Submitted on : Friday, April 2, 2010 - 8:00:00 AM
Last modification on : Wednesday, October 14, 2020 - 4:02:10 AM
Long-term archiving on: : Friday, September 10, 2010 - 3:12:52 PM

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  • HAL Id : pastel-00005944, version 1

Citation

Bruno Filliard. Étude de la possibilité de récupération de chaleur par voie thermodynamique pour la réhabilitation des maisons individuelles. Sciences de l'ingénieur [physics]. École Nationale Supérieure des Mines de Paris, 2009. Français. ⟨pastel-00005944⟩

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