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Thread: Heat gains
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06-06-2011, 09:18 PM #1
Heat gains
Hi all, I'm trying to work out how to cool 250 litres of water from 30°C to 25°C for an aquarium fish tank but im struggling to work out the cooling load.
I'm using the formula Q = m c dt
m = 250litres = 250kg
c = SHC for water= 4.19kj/kg
dt= 30-25 =5°C
Thinking of using a plate heat exchanger and a pump that will deliver 0.25kg/s through the exchanger ( this figure will change once i fully know i have the formula correct, its theoretical for now)
So we have :
0.25kg/s
4.19kj/kg
5k
So Q = 0.25 x 4.19 x 5 = 5.2kw.
This will complete the water cycle in 250/0.25 = 1000 seconds or 16.6mins
I understand that by reducing the mass flow rate this will decrease the cooling capacity but even still i thought these aquarium coolers are normally in the Watts range and not the KW, like i have calculated.Last edited by marc5180; 06-06-2011 at 09:54 PM.
The difference between genius and stupidity is that genius has its limits.
Marc