24 June 2014

SEASONAL PERFORMANCE CALCULATION AND TRANSIENT SIMULATION OF A NEWLY DEVELOPED 18 KW AIR-SOURCE WATER-AMMONIA GAS HEAT PUMP FOR RESIDENTIAL APPLICATIONS


Within the research project HEAT4U, an 18 kW heating capacity air-source waterammonia gas heat pump (GAHP) for residential applications has been developed and tested according to standard prEN12309. In this paper, the assessment of the GAHP seasonal gas
utilization efficiency is carried out by two different methods, namely TRNSYS simulation and a new simplified method. The first method aims to provide realistic estimates of the seasonal performance by means of dynamic simulations of the GAHP and the building load. The second method aims to reduce the complexity and the amount of information required by
dynamic simulations without relevant loss in accuracy. In particular, the simplified method follows the approach defined within standard prEN12309 and extends its applicability to different building loads, building insulation characteristics and weather data not considered within prEN12309. By comparing the two methods for different locations representative of the
European climate, it can be concluded that the proposed simplified method does not introduce significant deviations with respect to more detailed dynamic simulations, thus making it a suitable alternative for the development of decision support tools.