Heat Exchanger Efficiency
Heat Exchanger Efficiency
(OP)
Hi all,
I am working on a combined heat and power project, which will use a gas-water heat exchanger to capture the waste heat from exhaust gas of turbine and utilize this heat to heat up water. I need to have a general figure about the efficiency of gas-water heat exchanger.
I would like to ask what is the general range of efficiency of gas-water heat exchanger?
Regards,
Michael
I am working on a combined heat and power project, which will use a gas-water heat exchanger to capture the waste heat from exhaust gas of turbine and utilize this heat to heat up water. I need to have a general figure about the efficiency of gas-water heat exchanger.
I would like to ask what is the general range of efficiency of gas-water heat exchanger?
Regards,
Michael





RE: Heat Exchanger Efficiency
Roughly, for a single pass cross-flow heat exchanger you can assume 0.75/0.85.
RE: Heat Exchanger Efficiency
I have found that the efficiency of the heat exchanger calculated from the above data is above 95%. Is my calculation correct?
RE: Heat Exchanger Efficiency
RE: Heat Exchanger Efficiency
Efficiency = energy output/energy input
RE: Heat Exchanger Efficiency
Normally, the best thing to do is provide some HX manufacturers with your application data, and let them work out the unit best suited. Unless this type of calculation is something you're going to do regularly (and for most people, it's not) let the guys who do it all the time handle it. They'll be able to zip through it pretty fast, and may even have some standard designs that they can offer, which will cut the price and delivery time down considerably.
RE: Heat Exchanger Efficiency
I hope that helps.