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01-01-2012, 09:33 AM #4
Re: Chilled water Expansion tank sizing
The required volume of closed expansion tanks can be expressed as
Vet = k Vw [ ( v1 / v0 ) - 1 ] / [ ( pa / p0 ) - ( pa / p1 ) ]
Vet = required expansion tank volume (liter)
k = safety factor (approximately 2 is common)
Vw = water volume in the system (liter)
v0 = specific volume of water at initial (cold) temperature (m3/kg)
v1 = specific volume of water at operating (hot) temperature (m3/kg)
pa = atmospheric pressure (bara)
p0 = system initial pressure - cold pressure (bara)
p1 = system operating pressure - hot pressure (bara)