Excessive solar gains

asked 2019-07-16 10:28:44 -0600

Gregory
51 ●3

updated 2019-07-16 18:24:54 -0600

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

Hi everyone,

I am performing a dynamic simulation of a building in Energyplus.

I am strungling with excessive solar gains when windows are directly exposed to the sun. The temperature calibration of my building is quite reasonable except some peaks hours and I am quite sure that this is due to excessive solar gains when windows are directly exposed to the sun.

For example, East-oriented windows have excessive solar gains in the morning, South-oriented windows during noon and West-oriented windows in the afternoon.

I verified my weather file, but all the parameters are fine. So, it has to due something with the window definition in Energyplus. I am using WindowMaterial:SimpleGlazingSystem. Does anybody has an idea how I can compress those peaks to reasonable values without changing the Solar Heat Gain Coefficiënt, because these are given in the as-build plans AND will effect the rest of my simulation.

Kind regards.

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Comments

How do you know if the solar heat gain is excessive?

Luis Lara ( 2019-07-16 14:36:21 -0600 )edit

Do your building have site shading? And does the weather file you picked have reliable cloud coverage data?

mdahlhausen ( 2019-07-18 10:50:45 -0600 )edit

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answered 2019-09-19 17:18:56 -0600

Jono

305 ●3 ●11

Hi Gregory,

I recommend you take a look at your output variables file (i.e. eplusout.csv), finding solar radiation values for specific areas that concern you. This will help you check your model and confirm your suspicions. You can use DView or excel to open the file. If you use OpenStudio, the ViewData measure is particularly useful for this, as it gives a 3d visual heat maps.

If it turns out your radiation is higher than you would like, you can look at mitigation measures such as decreasing the SHGC, re-orienting your windows, adding shading objects, or adding interior or exterior blinds to control the incoming radiation.