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I output the hourly solar altitude angle, solar azimuth angle, and the Surface Outside Face Beam Solar Incident Angle Cosine Value for a window facing south. I found the surface outside face beam solar incident angle cosine value has some deviations.

Especially, at 04/11 16:30, the incident angle cosine value output from energyplus is a negative value, but according to the solar altitude angle and the amuzith angle, it should be a positive value, because the solar amuzith is smaller than 270 deg, which indicates that the direct solar beam can hit the fouth facade.

The formula for south facade I used is ：

cosAngle = cos(180-azimuth)*cos(altitude)

I also try to find the result, but I only find the function SurfCosIncAng is used to calculate the value in EnergyPlus, and I cannot find the implementation of the function SurfCosIncAng.

Real64 CosInc = state.dataHeatBal->SurfCosIncAng(state.dataGlobal->HourOfDay, state.dataGlobal->TimeStep, SurfNum);

I don't know if there is any EneryPlus developers in this forum who can answer this question.

I have found the answer by reading the source code. This is because the solar positions are updated every 20 days if def

How is the surface outside face beam solar incident angle cosine value calculated in EnergyPlus? I output the hourly sol

In eQUEST,DOAS are usually considered as a dummy zone that a single zone with reheat system serves.But I am always confused if thermostat schedules are required for dummy zone.And I have ever tested the result difference between assignment thermostat schedules for dummy zone and not assignment.I found that the heating energy of the case that thermostat schedules were assigned for dummy zone was significant larger than the case that thermostat schedules were not assigned.

In addition,In my project,outdoor air from DOAS is processed to (temperature:64.4F,Relative Humidity:60 %).How can I implement it in eQUEST.

Why the Site Diffuse Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar R

Why the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Ra

Why the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Ra

Why the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Ra

Why the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Ra

why is CDD50 used in ashrae90 Hi, everyone A question was confused me for a long time, so have to the email to ask you,

Is there any way to feed illuminance calculaed by Radiance to EnergyPlus Hi, everyone A question was confused me for a

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Is there any way to feed illuminance calculaed by Radiance to EnergyPlus Hi, everyone A question was confused me for a

Is there any way to feed illuminance calculaed by Radiance to EnergyPlus Hi, everyone A question was confused me for a

Is there any way to feed illuminance calculaed by Radiance to EnergyPlus Hi, everyone A question was confused me for a

Is there any way to feed illuminance calculaed by Radiance to EnergyPlus Hi, everyone I am sorry to bother you again, b

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Why Surface Window BSDF Beam Direction Number was 0? Hi,everyone I used LBNL window to generate a BSDF idf and import t

Why Surface Window BSDF Beam Direction Number was 0? Hi,everyone I used LBNL window to generate a BSDF idf and import t

Why Surface Window BSDF Beam Direction Number was 0? Hi,everyone I used LBNL window to generate a BSDF idf and import t

Why Surface Window BSDF Beam Direction Number was 0? Hi,everyone I used LBNL window to generate a BSDF idf and import t

Why Surface Window BSDF Beam Direction Number was 0? Hi,everyone I used LBNL window to generate a BSDF idf and import t

Why Surface Window BSDF Beam Direction Number was 0? Hi,everyone I used LBNL window to generate a BSDF idf and import t

Why Surface Window BSDF Beam Direction Number was 0? I used LBNL window to generate a BSDF idf and import the BSDF idf t

Why Surface Window BSDF Beam Direction Number was 0? I used LBNL window to generate a BSDF idf and import the BSDF idf t

Why Surface Window BSDF Beam Direction Number was 0? I used LBNL window to generate a BSDF idf and import the BSDF idf t

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radiance running on Windows cannot support parallel computing Why radiance running on Windows platform cannot support pa

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When we perform energy analysis in preliminary design stage ,there is a situation often occurs,which is the Window to Wall Ratio (WWR) is frequently changed. But in eQUEST, WWR can only be set in wizard mode.And once we enter the detailed mode,we can not return wizard mode.So if we have entered the detailed mode,how can we change the WWR? Is there a way to manipulate WWR in detailed mode?

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