Defining two integrated distinct HVAC for a SINGLE zone/space

asked Sep 20

Behnam
21 ●2

updated Sep 20

Aaron Boranian

14375 ●90 ●25 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

answered Sep 20

shorowit

12570 ●220 ●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.)

link

Comments

Hi Sir,

Thank you very much for your reply. I have applied your comments and formulated the IDF. It is working, but to be honest, I'm not entirely sure if it's correct. Would you be kind enough to check the validity of the logic in my program if I send you the IDF?

Behnam ( Sep 26 )

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