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heat exchanger plates and the distance between every two plates. The Reynolds’s number is first checked before the program runs. If the heat exchanger outside 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 outside flow in the laminar region. Then several variables are set in this calculation, namely: t infinite, which equals the fluid inlet temperature; the number of loops at each heat exchanger plate (n loop preset), which equals 2 as an initial value; Scalars b and nloop are both equal to 1 as initial values, etc. In the inner calculation loop, the fluid temperature after passing one loop of heat exchanger tubes is first calculated and then the number of tube loops on each heat exchanger plate (n loop) is compared with the pre‐set value (n loop preset) in the if‐clause. If nloop is smaller than nloop preset, the scalars start to be calculated as n round= n round+1, b=b+1, and the value of t infinite is reset as the fluid outlet temperature after passing n loops of heat exchanger tubes, then the calculation loop goes back to Equation 9‐13 to calculate a new fluid outlet temperature after passing one more loop of heat exchanger tubes. The calculation loop is kept running until the scalar n loop is bigger than n loop preset. Then the temperature of the working fluid at this time will be compared with the pre‐set preferred fluid outlet temperature, in the outer calculation loop. If this temperature is smaller than the preferred fluid outlet temperature, all the variables will be set back to the original values; the scalars are reset as n loop preset = n loop preset +1, b=1 and the inner calculation loop will run again to calculate the new fluid outlet temperature. Following the same procedure, the fluid outlet temperature is iterated until it reaches the preferred fluid outlet temperature that was set as a program’ input before. Then the calculation will stop and the program will export the outputs as: minimum number of plates required to keep laminar flow at the heat exchanger outside, the heat source outlet temperature, the number of tube loops in each heat exchanger plate, 111PDF Image | Thermodynamic Cycles using Carbon Dioxide
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