Sensible Heat Load Calculation issue
Sensible Heat Load Calculation issue
(OP)
I have a room that is supplied by 60 F air at 570 CFM and it is maintaning 74.5 F. With no people or lights on in the room.
If I calculate the Sensible Heat at CFM * 1.08 * Delta T or 570*1.08*14.5= 8926 BTU/Hr
Now if I want to convert this to watts to determine the room load. I divide the BTU/Hr by 3.415 equaling 2614 watts
Now if I divide the watts by 120v, it provides 22 amps. Actual circuits amps are 26.
But if I reverse the calclations to determine CFM required at 26 amps, I get 680 CFM required to maintain the current temperature of 74.5 F.
The room is surrounded by other conditioned spaces, no more than 1 deg cooler and the room has insulated.
Flow hood and VAV Box info shows 570 CFM and tempertures and loading has been verified. What am I not taking into account?
Thanks
If I calculate the Sensible Heat at CFM * 1.08 * Delta T or 570*1.08*14.5= 8926 BTU/Hr
Now if I want to convert this to watts to determine the room load. I divide the BTU/Hr by 3.415 equaling 2614 watts
Now if I divide the watts by 120v, it provides 22 amps. Actual circuits amps are 26.
But if I reverse the calclations to determine CFM required at 26 amps, I get 680 CFM required to maintain the current temperature of 74.5 F.
The room is surrounded by other conditioned spaces, no more than 1 deg cooler and the room has insulated.
Flow hood and VAV Box info shows 570 CFM and tempertures and loading has been verified. What am I not taking into account?
Thanks





RE: Sensible Heat Load Calculation issue
Right there.
RE: Sensible Heat Load Calculation issue
RE: Sensible Heat Load Calculation issue
And I believe you are correct regarding:" Sometimes you have to say its close enough."
It is always interesting to ensure verification of your calculations.
Thanks for the reply
RE: Sensible Heat Load Calculation issue
RE: Sensible Heat Load Calculation issue
RE: Sensible Heat Load Calculation issue
RE: Sensible Heat Load Calculation issue
RE: Sensible Heat Load Calculation issue
Can some of you test drive it and make some recommendations?
Is there away to attach files?