It is one of the unit used to measure the water volumetric flow rate.
The stand formula for calculating the TR as follow,
TR = (GPM × Delta T)/24
For this,we can find out the GPM
GPM =( TR×24)/Delta T
Where GPM is flow rate
TR is ton of Refrigeration
Delta T is temperature difference between supply and return chilled water
Let us consider AHU and its inlet and outlet water temperature is 30 degrees fahrenheit and 38 degrees fahrenheit and TR is 10.
Apply all these values in the GPM formula
GPM = (10×24)/(38-30)
= 240/8
GPM=30
Here the GPM depends only on temperatures, as the TR is constant throughout the process.
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ReplyDeleteHello,Sir. this equation is used to determine the TR? since the variable are the temperature different and control volume flow rate.
ReplyDeleteIf we apply this equation to calculation the volume flow rate, it seems can not obtain the correct answer with the FCU/AHU fully running, the TR should be fixed.
since i want to calculate the volume flow rate for the AHU. is it better we calculate by the pressure different?
Can you write one example to get better understanding on your questions.
ReplyDeleteAs per my opinion,this equation is suitable for all the situations.