24 June 2014
This paper present the performance of a novel high temperature difference heat pump. The SPP HighLift engine series SPP 4-106 is designed for heat pumping applications with sink temperatures up to 200°C. As the working medium of the process is a gas and do not undergo any phase changes during the process – it is a single-phase process – the HighLift heat pumps have very few restrictions on source- and sink temperatures. In addition, the process will quickly find a new equilibrium state with changing temperatures, meaning that the process is very robust with respect to e.g. large and sudden changes in inlet temperatures. The results shows for example that the heat pump can deliver over 400 kW of heat at 105°C (~220 °F) with a temperature lift of almost 80 K with a COPh at 2.0. In many applications both the heating and cooling can be useful. Combining the delivered heat and cooling gives an overall COP of between 3.1 at the same conditions.