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4 – Test Rig Design and Experimental Methods The prototype heat pump system comprised the following sub-systems: 1) An integrated brine-to-water CO2 heat pump unit 2) A heat source system (energy well, indirect system) 3) A space heating (SH) system – hydronic floor heating 4) A domestic hot water (DHW) system. The heat pump system was operated in two different modes: ♦ In the Auto mode, the CO2 heat pump unit utilized a 150 m deep rock well as heat source, and supplied heat to a 200 m2 low-temperature floor heating system and a 300 litre single-shell DHW tank. A Satch- well data acquisition system was used to control the overall system and the individual components, and to collect and process data from the temperature sensors, pressure transducers, volume/mass flow meters and watt meters. ♦ In the Test mode, the CO2 heat pump unit was operated indepen- dently of the heat source system, the floor heating system and the DHW tank in order to measure the performance at specified operating conditions. In this mode, all components, such as the CO2 compressor, pumps, and control valves were controlled manually, and the data from the data acquisition system were transferred to tailor-made Excel spreadsheets for further processing and analysis. Virtually all experiments were carried out in the Test mode, and the few results from the Auto mode were mainly used to compare the performance of the evaporator and the tripartite gas cooler with the design data. 4.1.2 Design of the CO2 Heat Pump Unit 4.1.2.1 General The prototype brine-to-water CO2 heat pump unit was designed for a total heating capacity of approximately 6.5 kW in the combined heating mode. The CO2 process as well as the individual components were analysed and designed by using MS Excel, Coolpack (Rasmussen, 2001) and software for heat exchanger design and analysis developed at NTNU-SINTEF, Department of Energy and Process Engineering. The integrated CO2 heat pump unit was constructed from the following components: 68PDF Image | Residential CO2 Heat Pump System for Combined
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