23 September 2011

PERFORMANCE MONITORING OF A HIGH-TEMPERATURE AIR-TO-WATER HEAT PUMP WITH INJECTION CYCLE INSTALLED IN A LOW-INSULATED SINGLE-FAMILY HOUSE IN BELGIUM


This paper deals with the performance monitoring and analysis of a capacity
controlled high-temperature air-to-water heat pump with injection cycle. The heat pump has
been installed in a low-insulated house in Belgium in March 2010 and is used for space
heating in combination with panel radiators or for domestic hot water production. Firstly, we
present the behavior of the heat pump in space heating mode as well as in domestic hot
water production mode. Secondly, the influence of the injection and of the type of heaters on
the performance of the heat pump in space heating mode is presented. Finally, the first
results for seasonal performance are presented. These results show that the machine has an
efficient control: injection starts for outdoor temperature where it is more efficient than the
non injection cycle, defrosting periods are short due to the good management of the speed of
the compressor and of the fan of the evaporator. This good behavior allows the heat pump to
significantly increase the COP values compared to common air-to-water heat pumps.