[Equest-users] Unit Heaters and RTUs serving the same zone

[Bishop, Bill]

Hi Victoria,
Your gymnasium is a good application for taking advantage of the new DOAS system type in eQUEST 3.65 build 7175 running DOE-2.3. Model the RTUs as a DOAS system. Model the hot water unit heaters as a Unit Heater system (UHT) and assign the gymnasium zone(s) to it. Then assign the DOAS to the Unit Heater system using the DOA-SYSTEM keyword and set the DOAS-ATTACHED-TO the CONDITIONED-ZONES. You will want to enter the gymnasium ventilation rate in the gymnasium zone(s). The eQUEST UHT system type doesn't normally accommodate ventilation but it seems to work in this configuration.
Regards,
~Bill

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

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From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Civitillo, Victoria via Equest-users
Sent: Wednesday, June 26, 2019 12:14 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Unit Heaters and RTUs serving the same zone

Hi all,

I am in the process of modeling a gymnasium that is served by two system types and I'm looking for the best way to model it. RTUs serve the space for cooling and ventilation purposes while hot water unit heaters supply the heating. The ventilation air from the RTUs tempered to 65degF during the heating months. Trying to figure out if there is a way to model it as a single system? I originally thought I could just mimic the RTU heating coil as the unit heater heating coil but got a ton of unmet hours. I have taken a powered induction unit with preheat as the approach now which has nixed my unmet hours but skyrocketed my heating energy consumption. Open to suggestions!

Thanks in advance,
Victoria


Victoria (Tsamis) Civitillo, PE, CEM, LEED AP BD+C, WELL AP
Sustainability Project Manager
 Direct: (212) 330-6165

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