[Bldg-sim] Setback Temperature

[Timothy Moore]

Indeed, ASHRAE 55 is he relevant standard for thermal comfort; however... While ASHRAE 90.1 does not specify min and max for the temperature setpoints be during occupied hours, it does include requirements for separation of the heating and cooling setpoints to provide an adequate deadband.

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of West, Scott P
Sent: Monday, December 02, 2013 3:09 PM
To: 'Anderson Letti'; 'bldg-sim at lists.onebuilding.org'
Subject: Re: [Bldg-sim] Setback Temperature

Anderson,
I was checking this out recently I don't believe temperature or humidity setpoints are regulated by ASHRAE 90.1 during occupied periods.  I think they primarily limit this through ASHRAE 55 regarding thermal comfort.  Of course ASHRAE standard 55 is often not mandatory but it is certainly good practice.  It goes without saying that several space types such as hospitals and labs have special temperature and humidity requirements that are industry-specific.

Scott P. West, P.E., LEED AP BD+C, BEAP, BEMP | JACOBS | Mechanical Engineer | Energy & Power Solutions | 817.222.8512 office | 817.897.1882 cell | scott.west at jacobs.com<mailto:rick.zilar at jacobs.com> | www.jacobs.com<http://www.jacobs.com/> | www.jacobs.com/energyportfolio<http://www.jacobs.com/energyportfolio>

From: Anderson Letti [mailto:anderson.a.letti at gmail.com]
Sent: Thursday, November 28, 2013 2:36 PM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] Setback Temperature

Dear all,

We are working on a project that has a special occupancy space and we need to determine a setback/setup temperature for moments that the space is not occupied during working hours.

Section 6.4.3.3.2, of ASHRAE 90.1, states that setback temperature must be 13ºC or lower, and setup temperature, 32ºC or higher. I understand these temperatures are for off-hours.

Are there such limits of setback/setup temperature for working hours? Or is it defined by design?

Regards,
Anderson Letti

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