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9.2.6 Program description 9.2.6.1 Evaporator In the evaporator calculation, the input to design the heat exchanger geometry seeks the design effectiveness of the heat exchanger (i.e. the preset working fluid temperature after passing the heat exchanger), namely: fluid inlet temperature (t fluid in); preset fluid outlet temperature (t fluid out), heat exchanger tube’s inner diameter, the tube’s wall thickness, the tube’s first loop diameter, the amount of heat exchanger plates and the distance between every two plates, etc. The variable t infinite in the calculation loop is first set equal to fluid inlet temperature (t fluid in), and then the fluid temperature after passing the first loop of heat exchanger tubes can be calculated by Equation 9‐13. Furthermore, this temperature will be compared with the preset fluid outlet temperature, which was set as an input to the program, in the if‐clause. If this temperature is higher than the preset fluid outlet temperature, t infinite will be set equal to this temperature and thus input into Equation 9‐13 again to calculate a new heat source outlet temperature (The temperature after passing two rounds of heat exchanger tubes). The value of twall is a constant for the evaporator, since the temperature of evaporation is constant (for pure refrigerant regardless of the pressure drop) until the refrigerant totally vaporizes. Following the same procedure, the heat source outlet temperature is calculated until it reaches the preset heat source outlet temperature. Then the calculation loop will stop and the program will export the outputs as: minimum number of plates required to keep laminar flow at the outside of the heat exchanger, the heat source outlet temperature, the number of required tube loops in each heat exchanger plate, approximate heat exchanger size, etc. In addition, the Reynolds number is always checked before the program runs. If the heat exchanger outside fluid flow is out of the laminar region, a warning will be given by the program to ask the user to reset the heat exchange geometry in order to keep the heat exchanger 109PDF Image | Thermodynamic Cycles using Carbon Dioxide
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