[Bldg-sim] Comfort calculation (globe temperature)

varun kulkarni seldomvarun at gmail.com
Thu Oct 6 08:18:08 PDT 2011


Right,
Because if you see the formula for MRT, as the air velocity approaches to
zero, MRT gets closer to globe temperature.
So MRT is equal to globe temperature, but only with zero air movement.

I am still not able to figure out a way to document the MRT calculations as
there is no way I would be able to measure the actual globe temperature.
How am I suppose to show the PMV/PPD calculations and operative temperature
calculations in LEED documentations ?

On Thu, Oct 6, 2011 at 11:11 AM, Abushakra, Bass <abushakr at msoe.edu> wrote:

>  Yes, MRT needs Globe Temperature.****
>
> Globe temperature requires a Globe Thermometer.  Radio Shack used to carry
> them.****
>
> There are no tables that could give you a Globe Temperature, because the
> reading depends on the specific space you’re studying.****
>
> ** **
>
> Bass****
>
> ** **
>
> ** **
>
> Bass Abushakra, Ph.D., Associate Professor****
>
> Technical Specialty Head, Building Mechanical Systems****
>
> Advisor, ASHRAE Student Branch****
>
> Civil and Architectural Engineering and Construction Management Department
> ****
>
> Milwaukee School of Engineering****
>
> 1025 N. Broadway, CC-41****
>
> Milwaukee, WI 53202****
>
> Tel: 414-277-4551****
>
> Fax: 414-277-7415****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Larry Degelman
> *Sent:* Thursday, October 06, 2011 9:34 AM
> *To:* 'varun kulkarni'; bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Comfort calculation (globe temperature)****
>
> ** **
>
> I never knew that the MRT calculation would require Globe Temp.  My
> understanding of this is that the Globe Temperature is actually a function
> of Air Temp, MRT and the convection (air speed effects.)  The MRT is
> calculable from the temperature of the surrounding surfaces.  If the Op Temp
> calculation includes air temp, MRT, RH, and air speed, then there is no need
> to ever know Globe Temp.   Opinions here, maybe not facts!****
>
> ** **
>
> Regards,****
>
> ** **
>
> *===========================*
>
> *Larry O. Degelman, PE, HBDP/BEMP*
>
> *Professor Emeritus of Architecture*
>
> *Texas A&M University*
>
> *ldegelman at suddenlink.net*
>
> *==========================***
>
> ** **
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *varun kulkarni
> *Sent:* Thursday, October 06, 2011 8:18 AM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Comfort calculation (globe temperature)****
>
> ** **
>
> Hello all,****
>
>  ****
>
> For EQc7.1 in LEED NC 2009, I need to provide detailed calculations for
> "operative temperature". ****
>
> ASHRAE 55 appendix C gives you the formula to calculate operative
> temperature, but that requires mean radiant temperature. And the formula for
> "mean radiant temperature" requires globe temperature.****
>
> I am trying to find a graph/chart/table from which I can obtain the "globe
> temperature" or do I even need to find globe temperature ?****
>
> Any insights, suggestions would be appreciated.
>
> -- ****
>
> Thanks and Best Regards, ****
>
> Sincerely,****
>
>  ****
>
> Varun Kulkarni  ****
>
> Note: Please do not print, unless required.****
>
>  ****
>
>  ****
>
> ** **
>



-- 
Thanks and Best Regards,



Sincerely,

Varun Kulkarni

Note: Please do not print, unless required.
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