22 May 2008
This paper presents results of a few months monitoring of an air-to-water
residential heat pump used for space heating in a single-family house. The refrigerant used
is R410A. The heat pump is equipped with a variable speed compressor. The scope of this
project is to show how the COP of the heat pump is influenced by the variable-speed. When
low variable speed is used, the phase change temperatures are close to the source and sink
temperatures leading to an improvement of the COP. The thermal heat may be adapted to
the thermal demand, avoiding the short-cycle working.