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in an AHU, How do i calculate chilled water flow rate using the air flow rate (CFM) & coil size?
Greetings
you can calculate using this formulas, units are
P (Kcal/h) = Q (m3/h) x 1000 x (Tin-Tout) (water Side)
P (Kcal/h) = Q (m3/h) x 0,29 x (Tin-Tout) (air Side)
Note: sensible heat only, 1000 and 0,29 are aproximations
If you need more help contact me at ricardoperry@gmail.com
interesting
400 CFM is about = to 1 ton of refrigeration so let's say you have 2000 CFm or 5 tons and you know that
Water flows with 1 gal/min and 10oF temperature difference. The ton of cooling load can be calculated as:
Cooling load = 500 (1 gal/min) (10 oF) / 12,000
= 0.42 ton so if you devide 5 tons/0.42 it = 12 gpm
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