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3.2 Gas Chiller A small-scale tube and shell-like heat exchanger was designed and developed by BNI to support the smaller scale tests. This gas chiller is designed to reject ~50 kW at 30 gpm flow rate of water at ~76°F for a CO2 exit temperature of 305.3 K at a mass flow rate of 3.5 kg/s . More heat can be rejected at larger flow rates or lower cooling water inlet temperatures. The spiral tube and shell like S-CO2 gas chiller is illustrated in Figure 3-8, which shows the chiller with the outer shell removed. The two colors of the spiraled tubing contain the S-CO2 fluid, while the cooling water flows in the annular passages between the two tubes. The general design description of the small pre-cooler is given in Table 3.2. Actual photos of the small pre-cooler during construction and installation in the compression loop are shown in Figure 3-9. Table 3.2: General description and design of the coiled tube-and-shell like gas chiller. Property Description Tube Diameter (OD) Tube Wall thickness Length of a single Coiled Tube Pitch of Coils Area of Gas / Liquid Heat Transfer Hydraulic Diameter of Gas / Liquid Value .0381 m 0.0024 m 19.15 m 0.1016 m 4.00 m2 / 4.58 m2 0.00333 m / 0.0144 m Figure 3-8: Engineering drawing of the compressor loop showing the ~50 kW gas chiller with the outer water housing jacket removed to show the S-CO2 spiral cooling lines. 30PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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