Chilled water
Chilled water
(OP)
Hello
a quick question that envolve enthalpy prob.
I need to find the flowrate of chilled water ( Pipe size and everything is unknown).
Assuming worst case summer ambeint air conditions.
supply water 42F
Return water 62F
Using thermal energy is not gonna help mass flowrate is unknown so teh flowrate
h = 500 q dt
where
h = total heat removed (Btu/h)
q = water flow rate (gal/min)
dt = temperature difference (oF)
Heat removed unknown.
Q = 500*GPM*(Delta T)
500 is constant
GPM= flow in gallons per minute
Delta T = temperature difference in Fahrenheit between the supply water and the return water.
Q = load in BTUh
Yet I don't have the Load....
any suggestion ? what kinda formula must bethere. /
a quick question that envolve enthalpy prob.
I need to find the flowrate of chilled water ( Pipe size and everything is unknown).
Assuming worst case summer ambeint air conditions.
supply water 42F
Return water 62F
Using thermal energy is not gonna help mass flowrate is unknown so teh flowrate
h = 500 q dt
where
h = total heat removed (Btu/h)
q = water flow rate (gal/min)
dt = temperature difference (oF)
Heat removed unknown.
Q = 500*GPM*(Delta T)
500 is constant
GPM= flow in gallons per minute
Delta T = temperature difference in Fahrenheit between the supply water and the return water.
Q = load in BTUh
Yet I don't have the Load....
any suggestion ? what kinda formula must bethere. /





RE: Chilled water
RE: Chilled water
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
RE: Chilled water
RE: Chilled water
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
RE: Chilled water
Let's assume that you know your airflow and air temps, then the load is Q=(CFM)*(4.5)*(Delta-h), where 4.5 is a "constant" and Delta-h is the change in enthalpy (BTU/Lb dry air). Now you can determine GPM.