Super Efficient Chillers
Super Efficient Chillers
(OP)
Just looking for some experienced feedback. Have you ever heard of a 500 ton chiller running at an efficiency of .15kw/ton? And theoretically, under what conditions would this be possible?





RE: Super Efficient Chillers
May be you are talking of a vapor absorption system. Still, it is a wrong notion to consider only the absorber, refrigerant and vacuum pump power inputs for calculation COP.
If it is a vapor compression machine, check the capacity of motor. If it is provided with 75kW motor then make a detailed and flawless agreement with the vendor for performace.
If everything turns to be OK (with a probability of few zeros after decimal point, at this juncture), post us back. This is high time for salary increment here
PS: 0.15kW/ton is not efficiency but is called as specific power consumption.
RE: Super Efficient Chillers
A project is claiming that given the geographical location (sf), the chiller never sees condenser ARI conditions 85 deg entering and 95 deg leaving. The project also claims an average condenser supply temperature of 57 deg F.
Now I'm familiar with floating head pressures, where compressor consumption is reduced with increased fan speed and lower entering condenser temperatures, but is the above possible at even 0.25kW/ton?
RE: Super Efficient Chillers
It's a vsd chiller.
RE: Super Efficient Chillers
How is the manufacturer showing it on paper? Did you have a look into the calculations?
RE: Super Efficient Chillers
I was just put onto this project and the nameplate provided was actually just for the vsd, so I don't have the manufacturers interpretations of performance.
Company 'x' monitored the data and came up with 'beast' like numbers. My feelings are that the numbers should be adjusted, but with time restraints on the project, I am unable to spend the time to remodel the facility.
RE: Super Efficient Chillers
Also, what type of compressor, reciprocating, screw, centifical... can make a difference on whether the VSD is worth the extra cost. for example, valve unloaders are excellent ways to unload PD compresors.