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

Mayank Bhatnagar mayank.23aug at gmail.com
Wed Sep 24 08:08:15 PDT 2014


Continue with the last mail........


The incident radiation falling on the east and west surface are outputs of
the simulation tools.

Regards,
Mayank

On Wed, Sep 24, 2014 at 8:36 PM, Mayank Bhatnagar <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> 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
>> > 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: Inline image 1]
>>>
>>> 2. eQuest and Energy Plus
>>> [image: Inline image 1]
>>>
>>>
>>>  Regards,
>>>
>>> Mayank Bhatnagar
>>>
>>> Energy Analyst
>>>
>>>
>>>
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>>
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