[TRNSYS-users] TRNSYS-users Digest, Vol 128, Issue 24 (Mean Radiant Temperature)

[Bradley Painting]

Hi Asit,

I can see how sunlight would change the mean radiant temperature (MRT);
however, the multizone manual says that TRNSYS only calculates MRT from
longwave radiation (emitted from surrounding surfaces). I am using internal
calculation -- simple model, which uses the formula:

[image: Inline image 1]

On Fri, Aug 21, 2015 at 10:29 AM, <
trnsys-users-request at lists.onebuilding.org> wrote:

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>    1. Re: TRNSYS-users Digest, Vol 128, Issue 23 (asit mishra)
>
>
> ---------- Forwarded message ----------
> From: asit mishra <writeto.asit at gmail.com>
> To: trnsys-users at lists.onebuilding.org
> Cc:
> Date: Fri, 21 Aug 2015 19:58:49 +0530
> Subject: Re: [TRNSYS-users] TRNSYS-users Digest, Vol 128, Issue 23
> Hello Brad,
>                 I have observed this happening (while taking readings with
> a globe thermometer) for locations near fenestration in summer. So, if you
> have a significant percentage of wall area covered by fenestration, this
> could happen. I cannot explain the winter situation though.
>
> Regards,
> Asit
>
> On Fri, Aug 21, 2015 at 5:45 PM, <
> trnsys-users-request at lists.onebuilding.org> wrote:
>
>> Send TRNSYS-users mailing list submissions to
>>         trnsys-users at lists.onebuilding.org
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>> To subscribe or unsubscribe via the World Wide Web, visit
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>>
>> or, via email, send a message with subject or body 'help' to
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>> You can reach the person managing the list at
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>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of TRNSYS-users digest..."
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>> Today's Topics:
>>
>>    1. Solar Thermal Collector outlet temperature (Arnaud Candaele)
>>    2. Mean Radiant Temperature More Extreme than        Individual Surface
>>       Temps (Bradley Painting)
>>
>>
>> ---------- Forwarded message ----------
>> From: Arnaud Candaele <arnaud.candaele at gmail.com>
>> To: trnsys-users at cae.wisc.edu
>> Cc:
>> Date: Fri, 21 Aug 2015 10:45:08 +0200
>> Subject: [TRNSYS-users] Solar Thermal Collector outlet temperature
>> Hi,
>>
>> I'm trying to model a simple solar thermal collector, using Type1a.
>>
>> I created a very simple test case, basically just taking the outdoor
>> temperature and solar radiation, and plotting the outlet temperature.
>> The thing is, I'm changing the number of collectors in series, and the
>> plotted outlet temperature doesn't change at all.
>> Isn't it supposed to change ?
>>
>> Thanks for any help !
>>
>> Arnaud
>>
>>
>> ---------- Forwarded message ----------
>> From: Bradley Painting <paintingbr at appstate.edu>
>> To: "trnsys-users at lists.onebuilding.org" <
>> trnsys-users at lists.onebuilding.org>
>> Cc:
>> Date: Thu, 20 Aug 2015 22:05:56 -0400
>> Subject: [TRNSYS-users] Mean Radiant Temperature More Extreme than
>> Individual Surface Temps
>> Hello,
>>
>> I am seeing poor thermal comfort and found that the mean radiant
>> temperature of my air node is more extreme than the inside surface
>> temperature of any individual wall or window comprising the airnode. It is
>> much colder in the winter and much warmer in the summer.
>>
>> This doesn't seem possible to me. Any idea what could cause this? Please
>> see first the aggregate temperature range for all walls and windows, and
>> then the mean radiant temperature for the same time period in the two
>> respective graphs below. Thanks.
>>
>>
>> [image: Inline image 1]
>>
>> [image: Inline image 2]
>>
>> --
>>
>> Brad Painting
>>
>> Master of Science Candidate, Renewable Energy Engineering
>>
>> Department of Technology & Environmental Design
>>
>> Appalachian State University
>>
>> Boone, NC  28608
>>
>> _______________________________________________
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>>
>
>
> --
> Asit Kumar Mishra (11ME92R01)
> Research Scholar
> Refrigeration and Air Conditioning Lab
> Department of Mechanical Engineering
> IIT Kharagpur
>
> a.
>
> @@@
> *The pen might not be mightier than the sword, but maybe the printing
> press was heavier than the siege weapon. Just a few words can change
> everything.*
> @@@
>
>
>
>
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>


-- 

Brad Painting

Master of Science Candidate, Renewable Energy Engineering

Department of Technology & Environmental Design

Appalachian State University

Boone, NC  28608
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