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When calculating the heat transfer on the outside, due to the characteristics of the heat exchanger geometry, the fluid flow in the rectangular channel, with the channel width being much bigger than the channel height (b>>s), has been assumed as a simplified model for the heat exchanger preliminary design stage. The scheme is illustrated in the following figure (Figure 9‐7): Figure 9‐7 Illustration of heat exchanger outside gas flow (side view) 9.2.5 Basic correlations The air mass flow can be calculated by the energy balance as shown below: Qpower mo Cpo to Equation 9‐2 Q power m CO2 h Equation 9‐3 where Qpower denotes the heat input/output of the heat exchangers (gas cooler, condenser and gas heater), ∆to is the heat exchanger outside fluid temperature change after passing the heat exchanger. Cpo is the specific heat of the heat exchanger outside fluid at the mean temperature between the preset inlet and outlet temperature. ∆h is the enthalpy difference between the outlet and the inlet refrigerant enthalpies. As mentioned before, the RANOTOR heat exchanger is designed to work in the laminar flow regime for the heat exchanger outside working fluids. Therefore, the Reynolds number should be calculated and checked to make sure that the flow is well within the laminar region (Re<2300). To calculate the Reynolds number, the velocity of the heat exchanger 104PDF Image | Thermodynamic Cycles using Carbon Dioxide
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