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Manual calculation of Zone radiant HVAC cooling rate

asked 2018-02-20 11:26:51 -0500

Siva's avatar

updated 2018-02-20 12:26:10 -0500

I am doing a project on Radiant Cooling System . Floor cooling. Now I am calculating manually to verify the values of Zone radiant HVAC cooling rate.

So I have considered following parameters like

a) Surface Inside Face Net Surface Thermal Radiation Heat Gain Rate Wfor floor

b) Surface Inside Face Convection Heat Gain Rate Wfor floor

C) surface inside face heat storage rate (W) (hourly)for floor

The sum of above three should be equal to Zone radiant HVAC cooling rate.

Any thing else than this?

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answered 2018-02-20 23:45:40 -0500

bbrannon4's avatar

It's not quite that simple. You should check out the work that the Radiant research team at the Center for the Built Environment in Berkeley, CA is doing on the subject. They have shown that radiant loads are not the same as typical air loads. I'd suspect that if you are looking to size a cooling system like that, you will be interested in the heat in the floor, the surface temperature of the floor, plus the surface temperatures of the surface that have some sort of view factor to the floor. The load itself would be based on the radiant temperature you expect to achieve in the space, but the cooling that the system can provide is also dependent on that radiant exchange. The E+ engineering reference guide has a good explanation of how they calculate it.

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Asked: 2018-02-20 11:26:51 -0500

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Last updated: Feb 20 '18