kW/Ton for typical older chillers
kW/Ton for typical older chillers
(OP)
I am trying to work up a "quick and dirty" energy savings calculation that is based on industry average kW/Ton for older chillers and the vintage (year).
I know I have seen a list of typical kW/Ton for older air-cooled and water-cooled chillers but I can't seem to find it. Any ideas where I can find this info?
I know I have seen a list of typical kW/Ton for older air-cooled and water-cooled chillers but I can't seem to find it. Any ideas where I can find this info?





RE: kW/Ton for typical older chillers
You can try to calculate kw/ton from your old chiller logsheet data,
kw=ampere x voltage x cos phi
ton=gpm x chilled water temp.diff (in/out chiller)
in one day operation you can see in logsheet that your ampere chiller will be varried according to the load and chw temp difference as well.
RE: kW/Ton for typical older chillers
RE: kW/Ton for typical older chillers
RE: kW/Ton for typical older chillers
25 years old - 0.90
20 years old - 0.85
15 years old - 0.80
10 years old - 0.75
5 years old - 0.70
2 years old - 0.65
RE: kW/Ton for typical older chillers
Huhh!??
Did you somehow get this exactly sdrawkcab? (Sorry, that's "backwards")
RE: kW/Ton for typical older chillers
Your "rules of thumb" look about right to me, although the newer Trane centrifugals can do a lot better than .65 -- I have a couple of 700 ton units installed in the last 4 years that are .5 to .6 for most of the load range, and as low as .43 when doing condenser water reset (ie, lowering condenser water setpoint when outside conditions are mild).
---KenRad