[Bldg-sim] PMV for Design & Operation

Fred Betz fbetz at aeieng.com
Thu Oct 9 14:35:01 PDT 2014


Hayes,

This tool is great, and works for LEED IEQc7 Thermal Comfort compliance as well.

http://smap.cbe.berkeley.edu/comforttool

Play around with it, there's lots of bells and whistles, but it's fairly intuitive.

Fred


Fred Betz  PhD., LEED AP (r)BD&C
Senior Sustainable
Systems Analyst



AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
fbetz at aeieng.com<mailto:fbetz at aeieng.com>  |  www.aeieng.com<http://www.aeieng.com/>



From: Craig Gann [mailto:cjg04austin at swbell.net]
Sent: Thursday, October 09, 2014 12:35 PM
To: bldg-sim at onebuilding.org
Subject: Re: [Bldg-sim] PMV for Design & Operation

 ASHRAE 55/ISO 7730 has a software program where you can input the air speed, DB/WB temps, clothing levels, occupant metabolic rate, etc and it will draw a comfort region on the psychrometric chart showing you the region with 80% occupant satisfaction (the max achievable value). ASHRAE Handbook shows a table with airspeed in the occupied zone and how you may change the effective draft temperature to maintain same comfort level. For example if you double the room air velocity in the occupied zone from 40 to 80 fpm you can set thermostat from 73 to 75F resulting in same 80% satisfaction level of comfort. This is why ceiling fans are such a good idea. Only downside of increasing room air motion much above 50 fpm is some occupants perceive air motion as drafts, especially those with lighter clothing.

Regards,

Craig J. Gann, P.E.; LEED AP

On 10/9/2014 10:31 AM, Hayes Zirnhelt wrote:
Has anyone used PMV (predicted mean vote) in the design of a building? We are looking for examples where systems, setpoints etc are completely based on PMV rather than dry bulb temperature. And any performance results - were people comfortable?

Also, if you've used a different thermal comfort metric for such objectives I'd be interested to hear about it as well.


Thanks,

--
Hayes Zirnhelt, M.A.Sc<http://M.A.Sc>
Associate, Buildings Practice

Rocky Mountain Institute | T: 303-567-8631<tel:303-567-8631> | E: hzirnhelt at rmi.org<mailto:hzirnhelt at rmi.org> | www.rmi.org<http://www.rmi.org>





--
Hayes Zirnhelt, M.A.Sc<http://M.A.Sc>
Associate, Buildings Practice

Rocky Mountain Institute | T: 303-567-8631 | E: hzirnhelt at rmi.org<mailto:hzirnhelt at rmi.org> | www.rmi.org<http://www.rmi.org>






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