[Equest-users] VRV with Variable Exhaust

[Tim Johnson]

I am attempting to model a university laboratory building that has a VRV system being used in combination with a variable volume exhaust and makeup air systems controlled by pressure independent valves.  We are doing heat recovery on the exhaust air, so from the archives, I see that the only way to account for that is to specify the exhaust flow as supply air from the makeup air unit that is 100% outside air.  Equest will then balance the supply and exhaust.  This way I can set my schedules to reflect the usage of the spaces and will account for the variable volume exhaust and makeup air.  
The issue becomes the VRV system.  Ideally, the makeup air unit would run separately providing tempered outside air for ventilation and exhaust hoods and the VRV fan coils would cycle on to meet the heating or cooling load.  I am using the VRV modeling methodology discussed at the Oregon BSUG.  Is there a way to get my VRV fans to cycle separately from the exhaust and ventilation systems?
Thanks for the help,
Tim

Tim Johnson
Mechanical EIT, LEED-AP  
DIRECT: 208.577.5645 
FAX: 208.343-3531





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