[Bldg-sim] MRT Tool

[Timothy Moore]

The ASHRAE Standard-55 Comfort Model (proper name) does allow for a
single user input. However, immediately to the right of the MRT value,
it also includes a "Calc" button that opens a separate dialog. In this
separate dialog, the user can enter values for the following parameters:

 

Room dimensions

Occupant location

Occupant orientation (facing wall or azimuth)

Occupant position (seated or standing)

Temperature for each of four walls, ceiling, and floor

And dimensions, location, and temperature for a "window or panel" area
within each of the four walls, ceiling, and floor.

 

I just sent a post with the actual MRT calculation dialog box (for those
of you that receive visuals in your emails); however, it appears that
the screen shot of the dialog was too big for the Bldg-Sim list serve.

 

The IES Virtual Environment also provides MRT, dry resultant
temperature, and the full range of ASHRAE 55 thermal comfort input
parameters and results (PPD, PMV, etc.) for a location in the center of
the room, as well as surface temperature results for each individual
surface in the model. These surface temperatures, for any given
simulation time step, can then be readily entered into the ASHRAE
Standard-55 Comfort Model above if one is interested in thermal comfort
for a specific location within a rectangular room. 

 

 


Timothy Moore 
Senior Consultant
Special Projects 

Mobile: 415 810 2495 
Office: 415 983-0603
timothy.moore at iesve.com <mailto:timothy.moore at iesve.com> 
www.iesve.com <http://www.iesve.com/> 

**Design, Simulate + Innovate with the <Virtual Environment>**

Email Disclaimer <http://www.iesve.com/disclaimer.html> 

 

 

 

 

 

 

 

 

From: Peter Simmonds [mailto:peter.simmonds at ibece.net] 
Sent: Tuesday, April 21, 2009 10:36 AM
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

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________________________________

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 

Mobile: 415 810 2495 
Office: 415 983-0603
timothy.moore at iesve.com <mailto:timothy.moore at iesve.com> 
www.iesve.com <http://www.iesve.com/> 

**Design, Simulate + Innovate with the <Virtual Environment>**

Email Disclaimer <http://www.iesve.com/disclaimer.html> 

 

 

 

 

 

 

 

 

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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