[Bldg-sim] Comfort calculation (globe temperature)

[Abushakra, Bass]

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<mailto: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.



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