refrigeration system - water flow rate

[denver1000 PE]

Hello - in example 138 in NCEES 2001

I'm wondering where the 500 gpm in the solution formula Q = 500gpm x delta T comes from... any help will be appreciated!

 

[lundy]

It all boils down to units for that 500 number "500 = the “fluid factor” this is based on water as the heat transfer fluid. The fluid factor is obtained by using the weight of a gallon of water (8.33 lbs.) multiplied by the specific heat of the water (1.0) multiplied by 60 (minutes). This comes out to 499.8 when using water."

 

[denver1000 PE]

Thank you Lundy

 

[lundy]

Thank you Lundy

No problem!

 

[P-E]

Generically. Q = m dot x cp x delta T

 

[Ramnares P.E.]

This ^^

 

[denver1000 PE]

Thanks.