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Try to be careful and log anything before you change it. Any change to the water flow rate on either side has a direct effect on the refrigeration system. i.e. if you reduce the evaporator flow rate because you appear to see a lower leaving water temperature due to the increase in delta T...

Thank you all for your help. It is very much appreciated. To prevent me annoying you all again, could anyone explain how to work out the following: 1) The enthalpy values. 2) Do I always convert the m3/s (x 1.2) to kg/s for the marcoh's calculation. 3) Do I always use 1.01 for the specific...

Hi all, Thanks for the support. Sorry about the delay in coming back. As it was the long bank holiday weekend we were away since last week. I've work in the process cooling sector (primarily with water chillers) for the last 16 years, so I've no experience in sizing A/C applications. I've...

Thanks for the help. The air tempature is from 25 down to 16, not the water. As you say we would then supply water to the AHU at 6 or 7 degC. Are there any rules of thumb we can use to calculate approx cooling loads?

I should have mentioned that the figures I posted relate to air flow for an AHU, which is why I'm struggling as my previous experience is only with chilled water systems.

Could anyone tell me the calculation to work out the cooling load for a chiller on an AHU. The flow rate I've been given is 9m3s and a delta T of 10 degC from 25 down to 15 degC. I know with water we use Q=m.c.dT where m is the flow rate in l/hr and we normally use '1' for 'c' assuming it is...