[Bldg-sim] Fwd: Variation in incident solar radiation on east and west surface of a building in different simulation tool

[Jeff Haberl]

FYI:



You also didn't say that you're using the EPW weather file in EQUEST, only that EQUEST is using .BIN format (or binary). Is EQUEST using TMY2 or TMY3?



Jeff


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Jeff S. Haberl, Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......jhaberl at tamu.edu<mailto:........jhaberl at tamu.edu>
Professor........................................................................Office Ph: 979-845-6507
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________________________________
From: Bldg-sim [bldg-sim-bounces at lists.onebuilding.org] on behalf of Peter Simmonds [psimmonds11 at gmail.com]
Sent: Wednesday, September 24, 2014 10:15 AM
To: Mayank Bhatnagar
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Fwd: Variation in incident solar radiation on east and west surface of a building in different simulation tool

Try checking the date and time set on the programs. One could be using summertime hours ?

Peter Simmonds, Ph.D., ASHRAE Fellow and DL
Mobile US: +1-310-383-9911
Mobile HKG: +852-9845-4902
Mobile UK: +44 7711 926317

On Sep 24, 2014, at 8:06 AM, Mayank Bhatnagar <mayank.23aug at gmail.com<mailto:mayank.23aug at gmail.com>> wrote:

Dear Dru,

Yes, I am using the same weather file for all simulation tools. eQuest used bin format, which I have already checked with weather file (epw format). The bin file only have total horizontal radiation and Normal direct radiation, the diffuse radiation is being calculated by eQuest itself (as per Joe huang's mail: previously asked for a query on eQuest users). TRNSYS and E+ used epw format.

The variation are found in radiation falling on east and west surface of the building.

Regards,
Mayank

On Wed, Sep 24, 2014 at 8:23 PM, Dru Crawley <dbcrawley at gmail.com<mailto:dbcrawley at gmail.com>> wrote:
Are you using the same hourly weather data in eQuest, TRNSYS and EnergyPlus?  The radiation can vary significantly.

On Wed, Sep 24, 2014 at 7:42 AM, Mayank Bhatnagar <mayank.23aug at gmail.com<mailto:mayank.23aug at gmail.com>> wrote:

Dear All,

I am doing envelope analysis of a rectangular building in eQuest. The building have identical parameters for all perimeter zones. The simulation is being done for New Delhi climate zone. The results shows that the total solar heat gain through glazing is more in east zone compare to west zone. In the result of that the total load and energy consumption in east zone is higher than in west zone.

To verify the results, I analyzed the total horizontal and beam radiation incident on east and west facade. Here, the issue was started. In the eQuest, there always high incident solar radiation in east surface compare to west surface. However, the incident solar radiation on east and west surface in energy plus and TRNSYS have different trend from the eQuest. Here I am attaching graph showing variation of incident solar radiation in east and west facade with energy plus and TRNSYS.

Any guidance, suggestions will be appreciated.

1. Variation in eQuest and TRNSYS. (Blue and green is for eQuest and; Magenta and brown for TRNSYS)

<image.png>

2. eQuest and Energy Plus
<image.png>


 Regards,

Mayank Bhatnagar

Energy Analyst



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