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Interzone Floor Contribution in Zone Component Load Summary

asked 2019-01-04 00:01:17 -0600

zahro gravatar image

updated 2019-02-11 08:10:54 -0600

Hello, I am using Zone Component Load Summary to find the estimated contribution of each heat source to the peak cooling load in my building. To exclude the ground heat transfer contribution for my cooling load, I am using the adiabatic surface for my ground surface on the first floor. I expect to see nearly zero contribution of ground contact floor in my Zone Component Load Summary result, and yes it's true. However, I see a negative number in the Interzone Floor result, which I didn't see before when I defined the ground as usual with ground temperature. What I understand from the Interzone heat transfer is that the number represent how much is the heat transferred from one zone to other adjacent zones. But the zone is located on the first floor, where the ground is not in contact with other zone surfaces.

I am just wondering, during the calculation of Zone Component Load Summary, what is the difference of calculating the contribution of Interzone Floor and Ground Contact Floor, and why the number is negative for the Interzone Floor? Is this because of the stored heat in the ground surface?

I could not check the heat transfer for each surface because I have more than 150 surfaces which are too much and would not be able to be displayed all in the result.

Thank you.

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answered 2019-02-12 07:30:03 -0600

The Zone Component Load Summary is a calculation that is separate from the normal heat balance routine that is included in EnergyPlus and is an approximation of the possible component loads. Part of what occurs is to estimate the heat load through each surface of a zone. You should look at the individual surface results to understand the heat flows. Please also check the "Difference Between Peak and Estimated Sensible Load" to see how good the estimate is for that zone. I would recommend that you review the documentation for that report in the Engineering Reference PDF that is in the Documentation folder where you installed EnergyPlus.

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Asked: 2019-01-04 00:01:17 -0600

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Last updated: Feb 12