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Humidity control

asked 2016-07-08 09:18:21 -0500

Wilson's avatar

updated 2017-05-06 08:31:16 -0500

Hi! I'm modeling a single zone building with OpenStudio. I'm trying to control the humidity inside the building.I added a Packadge Rooftop Heat Pump to my building model. As I have low knowledge about HVAC system I started to search questions about how to add a humidity control system to my model. This and this questions/answers gave me an overview about how to do it. In the first step I'm trying to add a Zone control:Humidistat by adding, in the Thermal Zones tab, the Humidifying and Dehumidifying setpoint schedules to my single zone but I'm not finding in the library this schedules. It is possible to had a humidity control system to a Packadge Rooftop Heat Pump? Thank you

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answered 2016-07-11 05:49:45 -0500

Just create a ScheduleRuleset with Type Percent. As stated in the documentation for ZoneControl:Humidistat, the schedules that defines the humidifying/dehumidifying relative humidity setpoint should expressed as a percentage (0-100), for each timestep of the simulation.

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Thank you for your answer Julien. I'm trying to find the way to create the ScheduleRuleset. It is possible to create a ScheduleRuleset using OpensStudio interface? Thank you

Wilson's avatar Wilson  ( 2016-07-11 11:51:40 -0500 )edit

It's in the quick start guide for example. Go to schedule tab > Schedule and then click the green + at the bottom.

Julien Marrec's avatar Julien Marrec  ( 2016-07-11 12:39:01 -0500 )edit

Thank you Julien. I added the Humidifying and Dehumidifying Setpoint Schedules and associate them to my single thermal zone in the "Thermal Zones" tab. I have some doubts in the way we can control the humidity with a Packaged Rooftop Heat Pump. What components realize the humidification/dehumidification of the zone? Should I have to add in the "Thermal Zone" tab a Dehumidifier-DX? If the solution is to add a Dehumidifier-DX in which node do we have to add the Setpoint Manager(minimum/maximum)? Thank you

Wilson's avatar Wilson  ( 2016-07-11 14:36:47 -0500 )edit

This thread might be getting a bit out of hand, and ultimately this has nothing to do with OpenStudio. It's more a matter of EnergyPlus (and maybe a bit of general HVAC knowledge). I suggest you try to read up the Input/Output reference guide, and take a look at the numerous example files that ship with EnergyPlus. In the Example folder inside the EnergyPlus install folder, you'll find two HTML files that will help you locate which file to look at. here open Example Files - with object links and search for ZoneControl:Humidistat

Julien Marrec's avatar Julien Marrec  ( 2016-07-11 14:51:29 -0500 )edit

Thank you for your suggestion Julien.

Wilson's avatar Wilson  ( 2016-07-11 17:16:06 -0500 )edit

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Asked: 2016-07-08 09:18:21 -0500

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Last updated: Jul 11 '16