Room Temperature Rise???
Room Temperature Rise???
(OP)
I have a question regarding the temperature rise of a pump and VFD room. I used some software to calculate the heat load of the space. The software gave me this output.
Sensible gain = 28270 btuh
Latent gain = 9980 btuh
Supply Air = 1336 cfm
Coil LAT = 61 F
Now the equipment I specified can only supply 900 CFM and is capable of 36000 btuh. My question is what will be the expected room temperature?
I get around 90 F. I used q=(CFM)*1.08*(Tr-Tc), with q= 28270 btu, CFM= 900 and Tc=61 F.
Is this right? Or am I using the wrong approach?
Thanks for your help.
Sensible gain = 28270 btuh
Latent gain = 9980 btuh
Supply Air = 1336 cfm
Coil LAT = 61 F
Now the equipment I specified can only supply 900 CFM and is capable of 36000 btuh. My question is what will be the expected room temperature?
I get around 90 F. I used q=(CFM)*1.08*(Tr-Tc), with q= 28270 btu, CFM= 900 and Tc=61 F.
Is this right? Or am I using the wrong approach?
Thanks for your help.





RE: Room Temperature Rise???
if your equipment works properly, is not too much oversized, your dry bulb room temperature will be the one set by controls.
the question is how much of latent capacity can be handled by that equipment. you should have some spec for latent capacity.ž
calculating indoor air temperature for design load only means a little. your system has to maintain design temperature at all conditions. how that will be achieved depends on system and controls configuration.
RE: Room Temperature Rise???
RE: Room Temperature Rise???
Yes, you are using the wrong approach - if randomly throwing unrelated numbers at equations can be considered an approach.
There is not enough coherent information in your post to allow anyone to offer any better guidance.
RE: Room Temperature Rise???
RE: Room Temperature Rise???
RE: Room Temperature Rise???
RE: Room Temperature Rise???
But how did you lower the heat output from the equipment?
if you can do this, why didn't you do it in the first place when you've calculated the load as a 5 tons.
RE: Room Temperature Rise???
The other issue when using split units or any DX unit for that matter for high temperature application( ie 90F or higher)is that it results in high compressor oil temperatures and eventual compressor breakdowns
RE: Room Temperature Rise???
If we bring in the OA, we can control it better. We can put a sensor across the filter to notify when it is dirty.
RE: Room Temperature Rise???
RE: Room Temperature Rise???