Heat Exchanger Calc's
Heat Exchanger Calc's
(OP)
Hi,
We are currently putting a package together with a compressor and a gen set and want to cool both units on one cooling circuit. I'm a rusty with thermo so I thought I would turn here. Here are the specs.
Total heat load will be 150,000 BTU/hr
Ambiant temp is 100 F.
We want the coolant out around 120 F.
Using a 60/40 solution of Eth. Gly. and H2O specific heat is around 0.75.
We were thinking of a flow rate of 10 GPM but that along with the size is still TBD.
We would like to find out the temperature of the coolant going into the exchanger. Possibly a way to figure out the unknowns as well. Thanks!
We are currently putting a package together with a compressor and a gen set and want to cool both units on one cooling circuit. I'm a rusty with thermo so I thought I would turn here. Here are the specs.
Total heat load will be 150,000 BTU/hr
Ambiant temp is 100 F.
We want the coolant out around 120 F.
Using a 60/40 solution of Eth. Gly. and H2O specific heat is around 0.75.
We were thinking of a flow rate of 10 GPM but that along with the size is still TBD.
We would like to find out the temperature of the coolant going into the exchanger. Possibly a way to figure out the unknowns as well. Thanks!





RE: Heat Exchanger Calc's
TTFN
RE: Heat Exchanger Calc's
Your 120F temperature (out of an air cooler I assume) is reasonable for 100F ambient temperature.
RE: Heat Exchanger Calc's
I suggest a larger flow than 10 GPM.
RE: Heat Exchanger Calc's
TTFN
RE: Heat Exchanger Calc's
Q = Heat load (BTU/hr)
m = mass flow rate (lbs/hr)
Cp = specific heat of coolant
DeltaT = temperature differential between inlet and outlet
From this formula: Tin = Tout + Q/mCp
Tin = 120 + 150000/(10 gpm x 66.4 x .78)
Tin = 156