RE: [EnergyPlus_Support] Zone mean Radiant Temperature

There is no problem with the chart you sent in the PDF file.

MRT shows the zone temperature change due to solar radiation or lights in the zone.

If you have a East facing window, you will have one peak before noon. The sun is blocked by the roof, and another peak will show in the West facing window.

If you have a Soucth or North facing window (tropical countries) you may get two peaks or three peaks, depends on how the window is shaded. The mid day peak will appear for a South facing window in Summer, for Brunei.

The MRT represent heat absorbed by the interior surfaces, and will be added to the zone mean air temperture. Therefore, dependending on the strength of the MRT, the shape of the ZAT will be distorted.

You should plot the graphs on the same page in order to see the relationship.

Because you surface names are in numbers, I cannot easily identify them.

The building I used is the one you used for daylighting simulation.

If you need more detailed explanation please do not hesitate to ask.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: veronikashabunko@xxxxxxxxx
Date: Wed, 28 Nov 2012 18:40:15 -0800
Subject: [EnergyPlus_Support] Zone mean Radiant Temperature

Good day everyone,

I have a trouble with understanding of the graphs: Zone Mean Radiant Temperature (ZMRT) or Zone Operative Temperature(ZOT) in two zones.

I have 2 floor, 10 zones building. The output for some zone are great, for others quite weird.

In attached file you can see the graph of outdoor temperature, ZMRT and ZOT of kitchen- zone in the first floor. The graph looks like shark fin, temperature in the zone is super high - I guess its because of electrical equipment ( about 2kW).

The other zone is also on the first floor, but graph has two hills. The decrease of temperature is understandable, but increase of temperature is not clear for me. Maybe it is affect from the top floor.

Is anyone have any explanation why is it this way? Any suggestion how to fix it?

Thanks for comments in advance!

Best regards, Veronika Shabunko

Energy Research Group UBD

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