22 May 2008

INVESTIGATION OF THE BENEFITS OF THE VAPOUR INJECTION SCROLL COMPRESSOR IN HEAT PUMPS USING A SEASONAL EFFICIENCY MODEL


A heat pump (HP) seasonal efficiency comparison method, recently reported, is
used to generate data, which enables the effect of varying parameters to be investigated.
The model can handle both space heating and domestic hot water requirements and takes
account of evaporator and condenser size, compensated control, back-up direct heating, and
defrost. In this paper the performance of similar sized air source heat pumps with various
types of scroll including the vapour injected scroll is compared. Weather data can be used to
establish space heating load patterns representative of various regions in Europe, and this
information is combined with the HP performance to show how the HP copes with regional
annual temperature cycles. Both air source and ground source can be modeled. Once the
results obtained from the software has been verified by test data at a few key points, the
seasonal performance can be investigated without the need for a long and costly test
programme.