Integration of a compact two fluid PCM heat exchanger into the hot superheated section of an air source heat pump cycle for optimized DHW generation

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2019
Author
Emhofer, Johann
Barz, Tilman
Marx, Klemens
Hochwallner, Felix
Cabeza, Luisa F.
Zsembinszki, Gabriel
Strehlow, Andreas
Nitsch, Birgo
Weiss, Michael
Suggested citation
Emhofer, Johann; Barz, Tilman; Marx, Klemens; Hochwallner, Felix; Cabeza, Luisa F.; Zsembinszki, Gabriel; ... Weiss, Michael. (2019) . Integration of a compact two fluid PCM heat exchanger into the hot superheated section of an air source heat pump cycle for optimized DHW generation. 25th IIR International Congress of Refrigeration, Montreal, Canada, August 24−30, 2019. http://hdl.handle.net/10459.1/69787.
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Abstract
This contribution presents a concept for the direct integration of a refrigerant/water Heat Exchanger (HEX) with a Phase Change Material (PCM) in the hot superheated section of an R32 - air source compression Heat Pump (HP) cycle, for optimized Domestic Hot Water (DHW) generation in multi-family houses. The concept takes advantage of the PCMs high thermal storage capacity integrated into a high performance compact enhanced plate-and-fin aluminium HEX. On the refrigerant side, it works as a de-superheater for DHW generation during heating and cooling operation whereas the process water is connected to decentralized DHW storages located in single apartments of a low energy building. We present results from simulations at a system level for typical operating conditions and corresponding seasonal and annual performances. Compared to conventional systems, the results indicate savings up to 11% of electric energy over the year for DHW generation in average climate.
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http://hdl.handle.net/10459.1/69787
DOI
https://doi.org/10.18462/iir.icr.2019.645
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25th IIR International Congress of Refrigeration, Montreal, Canada, August 24−30, 2019
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