Load does not reduce after eliminating internal gains

ApacheCalc – Heat loss/gain calculations using CIBSE procedures to determine design heating/cooling loads.
ApacheLoads – Design heating/cooling loads calculations using ASHRAE Heat Balance Method.
ru196859
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Joined: Tue Mar 07, 2017 2:27 am

Load does not reduce after eliminating internal gains

Postby ru196859 » Tue Mar 07, 2017 3:08 am

6 story building cooling load resulted a reasonable thermal load. About 300 tons.

Then I started applying EE measures and nothing was happening. Then I went to the extreme to find out why. So I did the following:

Lighting set 0w/m2
Occupancy set to zero
Oustide air set to Zero
Wall Uvalue set to zero
Fenestration Uvalue set to zero

The thermal load only reduced 30% after doing all that.

Wierd thing is, on autosizing, the return air temperature is 90 F. I have no idea where the heat gain is coming from.

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