I have a 100-kW diesel generator. I want to put a heat exchanger in the exhaust as part of a glycol loop to heat a building. How do I calculate the maximum mass flow rate of glycol that I can put through the heat exchanger without it boiling?
Topic: Heat Transfer: Calculating The Maximum Flow Rate of Glycol To Prevent Boiling3 February 2009
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Jim Grant Forum Moderator 114 Posts
Re: Heat Transfer: Calculating The Maximum Flow Rate of Glycol To Prevent Boiling3 February 2009 at 1:29pmYou must do an energy balance between hot and cold fluids to determine the area requirement of the exchanger and the desired maximum temperature of the glycol. First select the desired discharge temperature of the exhaust gas and the enthalpy change that results, including any condensation of moisture. Select an operating temperature for the glycol which is satisfactory for heating in the building and calculate the flow rate based on the desired maximum glycol temperature and the enthalpy recovered from the generator exhaust in the heat exchanger.