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4 – Test Rig Design and Experimental Methods The evaporator was insulated with 25 mm Armaflex (k=0.032 W/(mK)), and aluminium tape was used as diffusion block. 4.1.2.4 The Tripartite Gas Cooler The CO2 gas cooler for preheating of DHW, low-temperature space heating and reheating of DHW, was designed as three separate helical counter-flow tube-in-tube heat exchangers. Figure 4.9 illustrates the principle for the tripartite gas cooler with superimposed CO2 flows and water flows. CO2 inlet NV1.3 SOV3.1 Reheating DHW NV1.2 Space heating Preheating DHW CO2 outlet Hot water outlet Water outlet Water inlet SOV3.2 City water inlet Figure 4.9 Principle configuration for the tripartite gas cooler. When the unit was operated as a heat pump water heater, the CO2 flow was bypassed the space heating gas cooler by closing needle valve NV1.2 (Hook) and opening needle valve NV1.3 (Hook). In order to ensure proper oil return, the counter-flow heat exchangers were operated with the CO2 flowing downwards and the water flowing upwards. Under normal operation conditions, solenoid valve SOV3.1 (Danfoss) was open and solenoid valve SOV3.2 (Danfoss) was closed. However, in special cases when the inlet water temperature to the DHW preheating gas cooler exceeded the CO2 outlet temperature from the space heating gas cooler, SOV3.1 was closed and SOV3.2 was opened to avoid heating of the CO2 and subsequent operational problems. Reference is made to Section 3.3.2.3, The Reheating Mode, for further details on this topic. 76PDF Image | Residential CO2 Heat Pump System for Combined
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