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

摘要

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 sourcecompression Heat Pump (HP) cycle, for optimized Domestic Hot Water (DHW) generation in multifamilyhouses. The concept takes advantage of the PCMs high thermal storage capacity integratedinto a high performance compact enhanced plate-and-fin aluminium HEX. On the refrigerant side, itworks as a de-superheater for DHW generation during heating and cooling operation whereas theprocess water is connected to decentralized DHW storages located in single apartments of a lowenergy building. We present results from simulations at a system level for typical operating conditionsand corresponding seasonal and annual performances. Compared to conventional systems, theresults indicate savings up to 11% of electric energy over the year for DHW generation in averageclimate.