Constant Volume Multizone HVAC System Setpoint Manager

asked 9 years ago

dpud12
1269 ●1 ●12

updated 7 years ago

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

I am working on writing a measure for creating a Multizone Constant Volume HVAC system with reheat and wondering what the most appropriate supply air setpoint manager to use is. I see that there is a Single Zone Reheat setpoint manager, however, there is no equivalent for Multizone systems. Also, when I attempt to use the Multizone Humidity setpoint managers, they throw an error when running the simulation.

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For multi-zone air loops you can use the SetpointManagerScheduled object. I'll let @Kyle Benne address humidity control. You can only add humidity control to specific types of equipment.

David Goldwasser ( 9 years ago )

But since I want to model a Constant Volume system, isn't a scheduled setpoint manager not applicable? I thought that to satisfy the zone load given a constant air input, the temperature would need to vary free of a schedule

dpud12 ( 9 years ago )

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answered 9 years ago

aparker

8187 ●4 ●18 http://www.openstudio.net/

Use a SetpointManager:Scheduled set to ~55F on the supply outlet node if you want constant supply air temp, or a SetpointManager:Warmest:TempAndFlow if you want to have supply air temp reset based on the worst-case zone. In either case, the supply air temp will be cold, and any necessary reheat will be done by the zone terminals, not the central heating coil. The SetpointManager:SingleZone:Reheat is only used for single zone systems, where the reheat is done at the central heating coil (instead of at a terminal).

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Thank you both @David Goldwasser and @aparker So how common are single duct Multizone CV systems that have a fixed supply air temp set at 55? This produces a huge amount of simultaneous heating and cooling in my model and doubles the consumption for both these end uses.

dpud12 ( 9 years ago )

They are pretty common, especially in old buildings. According to the Energy Star Building Upgrade Manual "Retrofits involving conversion from CV to VAV are perhaps the most widely employed energy-saving retrofit to commercial HVAC systems, because typical airflow requirements for VAV systems are only about 60 percent that of CV systems."

aparker ( 9 years ago )

@aparker Thanks for the informative link!

dpud12 ( 9 years ago )

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Constant Volume Multizone HVAC System Setpoint Manager

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