Components of kW/Ton
Components of kW/Ton
(OP)
I am trying to figure out the optimum production cost of the overall cooling process (water cooled chilled water system)0. I would like to know what components are included in the kW per Ton value provided by the manufacturer. I am using the kW from the compressor, fan, and cooling tower and total cooling load and total cooling load capacity (from mechanical plans), but am unable to match the kW per ton value.
Any help would be appreciated
Any help would be appreciated





RE: Components of kW/Ton
Are any of the pumps, compressors, CT fans variable speed?
RE: Components of kW/Ton
The condenser and evaporator pumps, as well as the tower fan motor would all add to the total kW required to produce cooling.
One item to watch would be part load production. Many chiller are sold on full load kW/ton, but studying the efficiency of the plant at part load (depending on your process) may tell a better story.
RE: Components of kW/Ton
You should then compare this for various manufacturers to arrive at a more realistic way of comparison.
The components to be added are the compressor power, the chilled water pump power (primary and secondary) condenser water pump power and cooling tower fan motor power (assuming a water-cooled system). If the applcationis for air-conditioning, then add the AHU fan motors, FCU fan motors as well.
HVAC68
RE: Components of kW/Ton
The only way you can get to TR-Hr is to detail-model the duty cycle. Lots of them have been done for Air Conditioning type operating conditions and "normal" occupancy; Carrier has "bin-method" software that will help identify the conditions and durations of concern, but if a lot of your heat load is process-oriented, its not going to do a very good job estimating heat load or duration; especially if there are some batch processes involved.
(KW per TR) fills in the gap from total cooling
requirement to cost of power; and will depend on the load on the plant as a proportion of peak capacity and on the specific management of compressor capacity, fans and the like.