[Equest-users] Zones with different HVAC systems

[Jones, Christopher]

SUM system type. The DOE2.2 manuals do not explain the SUM system type very well. From the DOE2.1e manual:

4. System Descriptions
a. Summation of LOADS to PLANT (SUM)
This is actually not a secondary HVAC distribution system, but rather a diagnostic tool, which is used to 1) pass the hourly LOADS program output to the PLANT program without simulating a system, 2) adjust the constant zone temperatures specified in LOADS, 3) simulate the thermostat schedules (but not the equipment), and 4) tabulate energy consumption by ZONE (or group of ZONEs). SUM is not a miscellaneous SYSTEM-TYPE for UNCONDITIONED zones.

UNCONDITIONEO ZONEs should be assigned to another SYSTEM.



Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D35E1E.C16A37F0]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jing Hong via Equest-users
Sent: Wednesday, November 15, 2017 2:13 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Zones with different HVAC systems

Dear All,

I have a building with more than one kind HVAC system. I have the first floor with VAV system, and the second floor only has ventilation fans running. So I made all the zones on Second Floor unconditioned, and choose SUM as air-side HVAC system for second floor. However, the Space Cool of no VAV for second floor is even higher than that of the whole VAV, which does not make sense to me.
Do you know how the eQuest calculate Space Cool? Should The VAV energy consumption be Space Cool+Vent. Fans shown on the simulation output?
Thank you,
Jing

--
PhD Candidate, LEED AP BD+C

School of Architecture and Urban Planning
University of Wisconsin-Milwaukee


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