Using Exhaust to reduce heat load
Using Exhaust to reduce heat load
(OP)
Im working on a space that has some equipment with high heat gain into the room. It is a lab with 100% exhaust and I am placing the exhaust grilles over some of the higher loads in an effort to remove them from the space and reduce the volume of supply air required to cool the space. Is there a way to estimate the load reduction without resorting to a full on CFD analysis?





RE: Using Exhaust to reduce heat load
RE: Using Exhaust to reduce heat load
as GMcD said, all your exhaust will need to come in as makeup air. either through a device, or infiltration. But your idea is good, you basically "heat up" the exhaust to get more btu out of the room with each ft³ of air.
RE: Using Exhaust to reduce heat load
This is a classical conflict of requirements. To be efficient in air use, you'd like the air to increase in temperature as much as possible, but to be efficient in cooling the equipment, you'd like the air to be as cold as possible. One scenario is to make the equipment be the exhaust inlet, so that all the air that enters the room exits through the equipment being cooled. Your only two additional controls are the surface area of the heat sink and the velocity of the air going through the heat sink.
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RE: Using Exhaust to reduce heat load