Is there a template for humidifier in HB-Energy or do I need to create a detailed HVAC with IronBug?
I tried using this but the result is not right
Can anyone help with this?
Hi @LuizHVAC
Sorry I need to ask you a question, what kind of control objectives do you need to implement? Do you need to have the humidity setpoint to on and off a system or something else?
Hi @behnammmohseni
I need humidity control because the air-conditioned room needs to work with low humidity, as in this room people work with paper and cellulose, so the relative humidity needs to be between 50 ± 2%. Therefore, I need to size a humidifier and a reheat resistance.
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Hi @LuizHVAC
IB has much better options. You may need to set the control for an Outdoor Air unit from Humidity point of view.
Please find the below image:
As an idea, you can use this OA with the control in an DOAS joined with any other HVAC.
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Hey @LuizHVAC ,
VRF systems like the one that you have in your screenshot do not have an air loop (unless you instead use the “VRF with DOAS” template that’s assign-able via the HB DOAS HVAC component). Without an air loop, there’s no place for a humidifier to go so you won’t have humidification with that HVAC type. The dehumidification setpoint should still be respected, though the VRF units may not be able to dehumidify conditions to the setpoint given that they are sized for sensible load and not ventilation loads the way a DOAS is sized.
If you switch your HVAC to “VRF with DOAS”, you will see that you get humidification and the system will probably also do a better job of meeting the dehumidification setpoint.
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Thanks @chris.
I used “VRF with DOAS” and “HB Apply SetPoint Values”. I checked the Coil Sizing Summary, But the result of the Relative Humidity is below 60%. What is happening?
When I checked “HB Read Room Comfort Result” I noticed that this room is at 65%
To create humidity control in a space — whether it’s for comfort, preservation, or HVAC performance — you need a system that **monitors current moisture levels and adjusts the air moisture to meet a target setpoint.
From the forum discussion you shared, the key is setting a setpoint for relative humidity (RH) and integrating it with a system that can respond to changes in real time. In HVAC models (like with DOAS systems or VRF + DOAS), this means having a control point where humidity can be measured and humidification or dehumidification actions are triggered based on that reading. In software or simulation tools, this is often done by assigning a humidity controller to an air loop where humidification components can act. In your case, keeping RH at around 50 ± 2% for paper and cellulose work is the goal.
Practical Steps for Real-World Control
1.Measure the humidity level:
Use a reliable humidistat or humidity sensor to continuously read the relative humidity in the space. This acts like the “setpoint reference.” A humidistat senses RH and tells your system when to add or remove moisture.
2.Choose your equipment:
To raise humidity, use properly sized humidifiers. Brune Luftbefeuchtung Proklima GmbH offers a range of evaporative humidifiers designed to maintain target humidity in rooms of various sizes. Brune’s units allow you to select a desired humidity level and regulate moisture output so the space stays within the set range without overshooting.
3.Control logic:
The control system should compare the measured RH against the target. When the actual humidity falls below the setpoint, the system activates humidification. When it reaches or exceeds the setpoint, humidification stops. In technical HVAC design or modeling (like DOAS with humidity integration), the control logic does exactly this with heating and reheat paths or dedicated humidifiers connected to the system.
4.Balance with dehumidification:
In humid climates or during cooling seasons, you may also need dehumidification. Some advanced setups combine humidity sensors with both humidifier and dehumidifier controls so the space stays in the optimal zone, typically around **40 – 60 % RH for comfort and material preservation.
Why Proper Control Matters
Keeping humidity under control helps avoid issues like dryness that irritates occupants or excessive moisture that encourages mold. Professional humidifiers such as those from Brune are designed to dispense moisture evenly and reliably based on sensor feedback, creating a controlled indoor climate that matches your target humidity with minimal manual adjustment.
I understand what you meant. But to control humidity, I need to insert an AHU with VRF. The problem with DOAS is that it’s 100% outside air, and for this case I don’t need 100% outside air. Currently, LBT doesn’t have a VRF + AHU template that allows for some air return to the unit.