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Heat Gain (sensible kw) from dryers calculation 2
- Thread starter Hussey83
- Start date
ChrisConley
Mechanical
What is the input?
Gas or electric?
Heat gain will be a percentage of input.
Gas or electric?
Heat gain will be a percentage of input.
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MechEngNCPE
Mechanical
550 MBH input, 3600cfm
Qs=cfm*1.08*(dt)
Qs=3600*1.08*(70)=272MBH bringing air from 70degF to 140degF, now if the discharge temp is higher, you will have less gain to the room, as your dT will be larger.
550MBH-272MBH=278MBH gain. See what the outlet temp is and you will have it.
Qs=cfm*1.08*(dt)
Qs=3600*1.08*(70)=272MBH bringing air from 70degF to 140degF, now if the discharge temp is higher, you will have less gain to the room, as your dT will be larger.
550MBH-272MBH=278MBH gain. See what the outlet temp is and you will have it.
Sensible heat equation is not good enough.
It's a drier remember. You are vaporizing maybe 40 pounds of water in the process. You need to work out the latent process as well.
Then energy balance approach will work of course, you just need to account for all of the energy.
It's a drier remember. You are vaporizing maybe 40 pounds of water in the process. You need to work out the latent process as well.
Then energy balance approach will work of course, you just need to account for all of the energy.
- Thread starter
- #9
Depending on the installation, the heat gain to the occupied space may be negligible. The body of the dryer will be in the back of house space where all of the combustion/make-up air is (can be) introduced. Cycle time of the dryer will impact things, but for worst case you can assume they are all running constantly.
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