HEAT EXCHANGERSHeat TransferFigure 9 Fluid Flow DirectionThe temperature profiles of the two heat exchangers indicate two major disadvantages in theparallel-flow design. First, the large temperature difference at the ends (Figure 10) causes largethermal stresses. The opposing expansion and contraction of the construction materials due todiverse fluid temperatures can lead to eventual material failure. Second, the temperature of thecold fluid exiting the heat exchanger never exceeds the lowest temperature of the hot fluid. Thisrelationship is a distinct disadvantage if the design purpose is to raise the temperature of the coldfluid.HT-02 Page 32 Rev. 0
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business