Defining two integrated distinct HVAC for a SINGLE zone/space

asked 2024-09-20 04:27:26 -0500

Behnam
11 ●1

updated 2024-09-20 11:54:52 -0500

Aaron Boranian

13965 ●80 ●24 http://bigladdersoftware.com/

Hello EnergyPlus users and developers,

I need to ask a question about modeling two different HVAC systems for a super-duper simple SINGLE zone/space. Let’s say one is [HP+Electrich SHW] and the other [VAV+Gasboiler SHW]. I am interested in having the first one ([HP+Electric SHW]) to be operable from 7:00 to 16:00 and the other system ([VAV+Gasboiler SHW]) from 16:00 to 7:00. In the end, I should have one integrated result for the zone operative temperature and all the loads.

I would appreciate it if you could kindly let me know how I can perform this simulation.

Thanks very much in advance.

Sincerely, Behnam

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answered 2024-09-20 13:47:15 -0500

shorowit

11571 ●195 ●9 https://www.nrel.gov/b...

You can attach multiple HVAC equipment (whether zonal equipment, airloop HVAC, etc.) to the ZoneHVAC:EquipmentList object. This object defines all HVAC equipment serving the zone.

To specify the operation, you could then:

Set the load distribution scheme to "SequentialLoad"
Define Sequential Heating/Cooling Fraction Schedules, so that one system has 1s between 7:00-16:00 and 0s elsewhere, and the other system has 1s between 16:00-7:00 and 0s elsewhere.

(Alternatively, you could probably set the Sequential Heating/Cooling Fraction Schedules to constant 1s, and then use availability schedules on the equipment themselves to define their operation.)

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