Abstract
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 ØRC\ 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 (4kWe). From the results, the technical feasibility of the system is demonstrated. A cycle efficiency of 5.3% is achieved in ØRC\ mode (with condensation and evaporation temperature respectively of 25°C and 88°C) and a \COP\ of 4.21 is obtained in \HP\ mode (with condensation and evaporation temperature respectively of 61°C and 21°C).
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