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//Variable declaration:
T1 = 500.0 //Temperature of hot fluid entering the heat exchanger (°F)
T2 = 400.0 //Temperature of hot fluid exiting the heat exchanger (°F)
t1 = 120.0 //Temperature of cold fluid entering the heat exchanger (°F)
t2 = 310.0 //Temperature of cold fluid exiting the heat exchanger (°F)
//Calculation:
DT1 = T1 - t2 //Temperature difference driving force at the heat exchanger entrance (°F)
DT2 = T2 - t1 //Temperature difference driving force at the heat exchanger exit (°F)
DTlm = (DT1 - DT2)/(log(DT1/DT2)) //LMTD (driving force) for the heat exchanger (°F)
//Result:
printf("The LMTD (driving force) for the heat exchanger is : %.0f °F.",DTlm)
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