[Bldg-sim] Comfort calculation (globe temperature)

Anne Juran juran at summerconsultants.com
Thu Oct 6 10:22:40 PDT 2011


Are you able to claim that the operative temperature equals the air
temperature based on the 4 criteria listed in Appendix C?  All my LEED
projects have met those criteria and GBCI accepted it.  Don't know what to
tell you, though, if the criteria do not apply . sorry.

 

 

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 11:18 AM
To: Abushakra, Bass
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Comfort calculation (globe temperature)

 

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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