[Equest-users] Modeling common areas in multi-family

[Shaun Martin via Equest-users]

Hi Michael,

 

I frequently find that rooms like this will have exterior components, like roofs or floors, placed there by the wizard.  Also check your interior walls.  Inter-zone heat transfer through interior walls is all you have to maintain temperature, as there is no air flow.    

 

Shaun

 

 

 

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Michael Campbell via Equest-users
Sent: Monday, February 20, 2017 11:48 AM
To: equest-users <equest-users at lists.onebuilding.org>
Subject: [Equest-users] Modeling common areas in multi-family

 

Hello eQUEST Users,

I have a question regarding modeling common areas in a multifamily building.

I have 4-story residential building.

Floors 2-4 have corridors which are provided with outside air supply.

There are trash rooms, storage rooms, mechanical rooms off these corridors.

These trash rooms, storage rooms, mechanical rooms do not have their own heating/cooling systems, they are conditioned indirectly by the Corridor HVAC system.

Trash rooms and mechanical rooms have exhaust systems so i have modeled this per the design.


So in eQUEST I have modeled these spaces together as a single PSZ system using the Corridor space as the control zone.

I have modeled the Corridor with its specified outside air CFM supply per the drawings and I have modeled the trash rooms and mechanical rooms with their specified exhaust air CFM per the drawings, with exhaust air being made up via the air handler.

I have thermostat schedules set for the Corridor spaces (heat to 68F and cool to 78F), but have not used thermostat schedules for the trash rooms, mechanical rooms, storage spaces.  The reason I excluded thermostat schedules is because this is a single zone system and these spaces are essentially "along for the ride".

The issue I am having is that when I review my SS-F reports I am seeing temperature below 30F at times in the trash rooms.  I would expect that the temperatures would not be exactly the same as my Corridor since they are not being directly controlled but I am surprised to see such low temperatures as 30F and am sure the spaces will not reach these temperatures in real world conditions.  I am looking for some guidance on how to best model this scenario.  Any help would be appreciated.

Thank you,

 

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