Revision history [back]

I'm preparing an energy model in eQuest for a multifamily apartment building and have run into an issue with the DOAS system.

The building has (2) AHU units supplying 100% outside air which is conditioned by a CHW and HW Loop. There is one larger unit at an estimated 18,000 cfm and a smaller unit at 12,000 cfm. Currently, they are modeled together as one 30,000 cfm VAV (with the OA and fan max and min ratios both set to 1 in order to accurately represent the operating conditions of the actual equipment).

I was informed by the facility manager today that the larger AHU was actually not working for 6 months out of the year. This explains why my calibration was off during those months. Anyway, is there a way to mimic this in eQuest?

• A way to assign a single zone to (2) DOAS systems and then kill the fan power to one of them with a schedule
• Drop the CFM for the combined DOAS at a certain month during the year with a schedule?
• Any other method you guys might have?

Thanks for the help!

I'm preparing an energy model in eQuest for a multifamily apartment building and have run into an issue with the DOAS system.

The building has (2) AHU units supplying 100% outside air which is conditioned by a CHW and HW Loop. There is one larger unit at an estimated 18,000 cfm and a smaller unit at 12,000 cfm. Currently, they are modeled together as one 30,000 cfm VAV (with the OA and fan max and min ratios both set to 1 in order to accurately represent the operating conditions of the actual equipment).

I was informed by the facility manager today that the larger AHU was actually not working for 6 months out of the year. This explains why my calibration was off during those months. Anyway, is there a way to mimic this in eQuest?

• A way to assign a single zone to (2) DOAS systems and then kill the fan power to one of them with a schedule
• Drop the CFM for the combined DOAS at a certain month during the year with a schedule?
• Any other method you guys might have?

Thanks for the help!

I'm preparing an energy model in eQuest for a multifamily apartment building and have run into an issue with the DOAS system.

The building has (2) AHU units supplying 100% outside air which is conditioned by a CHW and HW Loop. There is one larger unit at an estimated 18,000 cfm and a smaller unit at 12,000 cfm. Currently, they are modeled together as one 30,000 cfm VAV (with the OA and fan max and min ratios both set to 1 in order to accurately represent the operating conditions of the actual equipment).

I was informed by the facility manager today that the larger AHU was actually not working for 6 months out of the year. This explains why my calibration was off during those months. Anyway, is there a way to mimic this in eQuest?

• A way to assign a single zone to (2) DOAS systems and then kill the fan power to one of them with a schedule
• Drop the CFM for the combined DOAS at a certain month during the year with a schedule?
• Any other method you guys might have?

Thanks for the help!