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4 – Test Rig Design and Experimental Methods 4 Test Rig Design and Experimental Methods This chapter expands on Chapter 3, Theoretical Background and System Evaluations, and provides a detailed presentation of the design, instru- mentation and experimental methods for the following test rigs: ♦ A 6.5 kW residential brine-to-water CO2 heat pump unit for com- bined space heating and hot water heating (prototype). ♦ A 200 litre cylindrical single-shell domestic hot water (DHW) tank, including two movable insulating plates (prototypes). The main purpose of the heat pump test rig was to document the energy efficiency and operational characteristic in order to evaluate the technical potential of integrated CO2 heat pump systems in residential applications. The objective of the second test rig was to measure the transient tempe- rature development in cylindrical single-shell DHW tanks caused by internal and external heat transfer, and to examine the feasibility of using an insulating plate between the hot and cold water volumes to reduce the exergy losses in the tank. 4.1 Testing of a Residential Brine-to- Water CO2 Heat Pump Unit 4.1.1 Introduction A residential brine-to-water CO2 heat pump unit for combined space heating and hot water heating was constructed in order to measure the heating capacity and COP as well as to study component and system behaviour over a wide range of operating conditions. Since it was consi- dered as interesting to run the unit at realistic operating conditions and obtain long-term operational experience, the prototype CO2 heat pump was installed in a detached pilot house situated in Trondheim, Norway. 67PDF Image | Residential CO2 Heat Pump System for Combined
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