Chiller efficiency is generally expressed interms of iKW/TR.
Where,
i stands for indicated
KW stands for kilo watt
TR stands for ton of refrigeration
iKW/TR is nothing but the ratio of electrical power input to the compressors to ton of cooling produced by the equipment.
Less value of iKW/TR indicates high efficiency of chiller
Higher value of iKW/TR indicates low efficiency of chiller.
The chiller performance test is usually carried out once in year by the chiller OEM
During the performance test, OEM will bring power quality analyser and ultrasonic clamp on flow meter to the site .
Ultrasonic clamp on flow meter will be installed at return chilled water pipeline of chiller.This flow meter will sense the flow rate of fuild flowing through the chiller. The flow rate can be expressed in gpm or m3/hr.
The power quality analyser will be installed at input power supply consumed by chiller/compressor.
To calculate the TR of chiller, we have to use the below formula
TR =(gpm x delta T)/24
Where
Gpm is gallon per minute
Delta T is temperature difference between entering and leaving chilled water temperature
Once you find out the TR of chiller by using the above formula,then you can find out iKW/TR.
For example:
Kw of chiller at 100% load is 2
Ton of refrigeration of chiller is 2
Formula to find out chiller efficiency is
iKW/TR =2/2=1
Thanks for reading this topics.
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Ashokraj S
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