Chiller power consumption calculation

[bartlino]

Hello,

If I am trying to calculate the heat removed from a chiller system through this formula on engineering toolbox.com:

Does COP or efficiency of the equipment come into play with this calculation? For example if a chiller is fully loaded isn't it running more efficient for a watt/ton basis? Vs a chiller only running at 50% load, would COP be different?

I am interested in converting the btu/hr output to kW to attempt to relate this to the total electrical power (kW) consumption for a building.

Thanks!

 

[BvU]

Does COP or efficiency of the equipment come into play with this calculation?

Apparently not. Your link also tells you what it does.

The COP comes in when $q$ is divided by the work needed to effectuate this removal

I am interested in converting the btu/hr output to kW

Why not simply google "btu/hr output to kW" ?

 

[Lnewqban]

That calculation is for the water side only, not accounting for the type of equipment doing the cooling work, or its efficiency.
Normally, you see the specs of the chiller, then you see whether or not it is able to cool the water as needed by the system.

 

[russ_watters]

For example if a chiller is fully loaded isn't it running more efficient for a watt/ton basis? Vs a chiller only running at 50% load, would COP be different?

I am interested in converting the btu/hr output to kW to attempt to relate this to the total electrical power (kW) consumption for a building.

Yes, COP varies with load. It also varies with source/sink temperature difference. And it's different for different chillers. So you really need the data for your specific chiller and usage scenario.