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4 – Test Rig Design and Experimental Methods A stainless steel wire with suitable thickness was wrapped as a spiral around the inner CO2 tube in order to maintain uniform distance between the CO2 tube and the water tube. The gas coolers units for space heating and preheating of DHW were insulated with 12 mm Armaflex, whereas 25 mm insulation was used for the DHW reheating gas cooler unit due to the high operational temperature. 4.1.2.5 The Suction Gas Heat Exchanger The main purpose of the suction gas heat exchanger was to superheat the suction gas to the compressor. The heat exchanger was designed as a counterflow tube-in-tube unit, and the heating capacity was controlled by means of ball-valves at the inlet and outlet of the heat exchanger tubes. Table 4.7 presents the technical specifications for the heat exchanger, whereas Figure 4.13 shows the heat exchanger before it was installed in the heat pump test rig. Table 4.7 Technical specifications for the suction gas heat exchanger. Type: Number of circuits: Material: Diameters, inner tube (low pressure CO2): Diameters, outer tube (high pressure CO2): Tube length: Average coil diameter: Approximate weight: Heat transfer area, inner tube (low pressure side): Heat transfer area, inner tube (high pressure side): Ratio, heat transfer areas (Ao/Ai): Cross-sectional area, inner tube (low pres. side): Cross-sectional area, annuli (high pressure side): Ratio, cross-sectional areas (Ac,o/Ac,i): Tube-in-tube heat exchanger One Stainless steel, both tubes Di =8mm Do =10mm Di =12mm Do =16mm 2.3 m 350 mm 2.5 kg Ai = 0.058 m2 Ao = 0.072 m2 1.25 Ac,i = 50 mm2 Ac,o = 35 mm2 0.7 80PDF Image | Residential CO2 Heat Pump System for Combined
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