[Bldg-sim] MRT Tool

[Peter Simmonds]

Ah, another can of worms. MRT is probably the least understood and
certainly the least calculated of space thermodynamics. ASHRAE RP 1383
was specifically set up to calculate MRT for spaces, even having unusual
configurations. It should be ready in about 18 months or so? 

So Vikram, with reference to your analogy, how about this one?

Imagine a space that is naturally ventilated through an open window, at
this certain time of the day the occupant is in such a position that the
suns rays reach the occupant through the open window. What would the MRT
be in the space and how would this affect the occupants comfort.

 

Peter Simmonds. Ph.D.
Senior Associate, Advanced Technology Group

IBE Consulting Engineers
14130 Riverside Drive Suite 201
Sherman Oaks, CA 91423
p:   (818) 377-8220 ext. 246
f:    (818) 377-8230
m:  (818) 219-1284

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________________________________

From: Vikram Sami [mailto:VSami at lasarchitect.com] 
Sent: Tuesday, April 21, 2009 12:02 PM
To: Peter Simmonds; Timothy Moore; Karen Walkerman;
bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] MRT Tool

 

It's an interesting conundrum that the times that MRT becomes a
significant player in the comfort calculation is when there is an uneven
radiant field (hot or cold window; fireplace; thermal mass wall). In
such a situation, is it fair to average out the MRT for an entire room?
Don't your view factors change drastically depending on your position in
the room? 

 

Does one person too hot near the window and another person too cold on
the inside equal thermal comfort?  

 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE
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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Peter
Simmonds
Sent: Tuesday, April 21, 2009 1:36 PM
To: Timothy Moore; Karen Walkerman; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] MRT Tool

 

I do not think the thermal comfort tool calculates the MRT it is a user
input.

 

Peter Simmonds. Ph.D.
Senior Associate, Advanced Technology Group

IBE Consulting Engineers
14130 Riverside Drive Suite 201
Sherman Oaks, CA 91423
p:   (818) 377-8220 ext. 246
f:    (818) 377-8230
m:  (818) 219-1284

This e-mail message, including any attachments, is for the sole use of
the intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure, or distribution
is prohibited. If you are not the intended recipient, please contact the
sender by reply e-mail and destroy all copies of the original message

 

________________________________

From: Timothy Moore [mailto:timothy.moore at iesve.com] 
Sent: Tuesday, April 21, 2009 10:00 AM
To: Karen Walkerman; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] MRT Tool

 

Karen,

 

The ASHRAE-55 Thermal Comfort Tool created by the UC Berkeley Center for
the Built Environment and available from ASHRAE publications (if I
recall correctly) includes a very easy-to-use MRT calculator for
rectangular rooms. It allows for MRT at a particular position in that
room, separate surface temperatures and dimensions for surfaces, and
also the inclusion of a "panel" or other area within one of the walls
(such as a cold/hot window, heating panel, etc.) that has a distinct
temperature. This is part of a very handy tool for determining PPD, etc.
based upon the typical range of human thermal comfort variables (clo
value, activity level, air temp, MRT, humidity, air movement).

 

Cheers,

Timothy

 

 

 


Timothy Moore 
Senior Consultant
Special Projects 

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timothy.moore at iesve.com <mailto:timothy.moore at iesve.com> 
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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Karen
Walkerman
Sent: Tuesday, April 21, 2009 9:50 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] MRT Tool

 

Hello,

Is anyone aware of a simple Mean Radiant Temperature calculation tool?
I'm looking for something that will calculate MRT for a basic
rectangular room.

Thanks!

--
Karen

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