[Equest-users] Design Day Temp Changes not Impacting Unconditioned Zone Temperatures

[Bishop, Bill]

Hi Darryl,
The temperature of an unconditioned zone is going to float based on loads in the hourly simulation. Changing the Design Day Properties affects the system sizing as reflected in the loads reports, but doesn’t change the actual loads that are used in the hourly simulation. Unconditioned zones are not heated or cooled by systems, so system sizing should have no impact on zone temperatures. The outdoor air temperature in the hourly simulation is dictated by the weather file. The zone temperatures reported in SS-F should change if you use a different weather file, provided the space has an infiltration load or exterior surface.
Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer

[Pathfinder-EA-logo-2]T: (585) 698-1956                        F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>        www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
[cid:image011.png at 01D3E2C0.04AE5B10]134 South Fitzhugh Street
Rochester, NY 14608                                Ask me why Carbon Fee & Dividend may be right for you.

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Darryl Kasun via Equest-users
Sent: Wednesday, May 02, 2018 7:03 PM
To: equest <equest-users at lists.onebuilding.org>
Subject: [Equest-users] Design Day Temp Changes not Impacting Unconditioned Zone Temperatures

Hi everyone,

I am modelling a parking garage and would like to know what the impact of different heating design day temperatures has on the temperatures on each parking garage level. The parking garage is below ground but I have modelled P1 with some roof space. Within the Design Day Properties, when I change the min outdoor air temp, the temperatures in the parking garage remain the same. See below for screenshots of the changes I have made, which is only to DRYBULB-HIGH.

I see the dry-bulb temperature changes on the LS-A reports but when I look at the SS-F reports, the temperatures in those unconditioned zones remain constant.

Any help would be appreciated!


[cid:image012.png at 01D3E2C0.04AE5B10]


[cid:image013.png at 01D3E2C0.04AE5B10]


Darryl Kasun, P. Eng., LEED® AP
250.299.1586
interiorengineering.ca<http://interiorengineering.ca>
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