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4 – Test Rig Design and Experimental Methods Table 4.5 Technical specifications for the tube-in-tube gas cooler for reheating of domestic hot water (DHW). Type: Number of circuits: Material: Diameters, inner tube (CO2): Diameters, outer tube (water): Tube length: Average coil diameter: Approximate weight: Heat transfer area, inner tube (CO2 side): Heat transfer area, inner tube (water side): Ratio, heat transfer areas (Ao/Ai): Cross-sectional area, inner tube (CO2 side): Cross-sectional area, annuli (water side): Ratio, cross-sectional areas (Ac,o/Ac,i): Tube-in-tube heat exchanger One Stainless steel, both tubes Di = 6 mm Do =8mm Di = 12 mm Do =16mm 3.5 m 350 mm 3 kg Ai = 0.067 m2 Ao = 0.088 m2 1.33 Ac,i = 28 mm2 Ac,o = 63 mm2 2.2 Figure 4.11 shows the tube-in-tube gas cooler for reheating of DHW before it was mounted in the test rig. Figure 4.11 The tube-in-tube gas cooler for reheating of hot water. 78PDF Image | Residential CO2 Heat Pump System for Combined
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