Abstract :
[en] This paper presents an innovative reversible Heat Pump/Organic Rankine Cycle (HP/ORC)
experimental unit designed to be coupled to a Net Zero Energy Building (connected to a
120 m2 thermal solar roof and a ground heat exchanger). The system can operate in three
different modes: an ORC mode to produce electricity when a large amount of heat is
collected by the solar roof, a direct heating mode using exclusively the solar roof, and a HP
mode for space heating during cold weather conditions. This paper describes a comprehensive
experimental campaign carried out on a prototype unit using a modified HVAC
scroll compressor (4 kWe). From the results, the technical feasibility of the system is
demonstrated. A cycle efficiency of 4.2% is achieved in ORC mode (with condensation and
evaporation temperature respectively of 25 C and 88 C) and a COP of 3.1 is obtained in HP
mode (with condensation and evaporation temperature respectively of 61 C and 21 C).
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