When the flow rates of the two fluids in the heat exchanger increase, does the temperature rise increase or decrease?
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When the flow rates of the two fluids in the heat exchanger increase, does the temperature rise increase or decrease?
If other conditions remain unchanged, an increase in flow rate leads to an increase or decrease in heat transfer. Therefore, for heat exchangers without phase change, the temperature at the cold fluid outlet increases, while the temperature at the hot fluid outlet decreases ； Heat exchangers with phase changes have an impact on the liquid-gas fractions of condensation or vaporization, and the outlet temperature may remain unchanged.
As the flow rate of the heat transfer medium increases, the outlet temperature definitely rises； As the flow rate of the cold fluid increases, the outlet temperature will definitely decrease ； When the flow rates of both media are increased simultaneously, the temperature at the outlet of the media generally does not change much; it depends on which medium has a faster increase in flow rate.