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How can I control a loop by relative humidity?

asked 2018-07-21 06:47:14 -0600

taher.ahel gravatar image

updated 2018-07-22 05:11:35 -0600

I'm going to control airloop by air relative humidity... There are a zone and an air loop containing 1 humidifier and 1 fan. The fan is always on and I try to turn it off when humidifier is off...

how can I turn loop off?

I try to use EMS and turn the fan off when humidifier power is 0 but it didn't work...and also I've tried to change loop availability by using a sensor for humidifier power but it doesn't work also... what must I do?

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answered 2018-07-23 07:26:36 -0600

Option 1 - Wrap the fan with an AirLoopHVAC:UnitarySystem object. It is a multipurpose system object which can be set to use LatentOnlyLoadControl. It should cycle the fan on whenever there is a latent load.

Option 2 - Since you already have an EMS program in place, change the sensor to "Zone Predicted Moisture Load to Humidifying Setpoint Moisture Transfer Rate".

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I use "Zone Predicted Moisture Load to Humidifying Setpoint Moisture Transfer Rate" Sensor and it solved the problem...

Thank you

taher.ahel gravatar image taher.ahel  ( 2018-07-23 15:49:04 -0600 )edit

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Asked: 2018-07-21 06:47:14 -0600

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Last updated: Jul 23 '18