23 September 2011

PERFORMANCE ANALYSIS OF HIGH-TEMPERATURE HEAT PUMPS INSTALLED IN LOW-INSULATED DWELLINGS: CASE OF A SINGLE-FAMILY HOUSE IN BELGIUM


This paper deals with the performance analysis of high-temperature heat pumps
installed in renovated low-insulated dwellings. This analysis has been applied to a heat pump
with injection cycle installed in a single-family house in Belgium. The thermal behavior of the
house and the performance of the heat pump have been modeled in TRNSYS. Firstly, the
model is used to estimate the performance of the installed system and secondly to perform a
parametric study by testing heat pumps with different heating capacities, with and without
injection cycle, by changing the insulation level of the house or by testing different types of
radiators. The model gives a SPF=2.86 for the installed system and shows that the heat
pump is a little oversized, that a reduction of energy consumption (14%) and an improvement
of the SPF (up to 3.32) can be obtained by increasing the surface area of the radiators by
50% or by a better insulation of the house (20 cm mineral wool under the roof, 3 cm of
expanded polystyrene under the floor, new double glazing windows).