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Humidistat controlled heating (Conservation Heating)

asked 2021-09-08 02:37:44 -0500

Debayan93's avatar

updated 2022-02-18 17:26:04 -0500


I am looking to achieve a humidistat controlled heating strategy (Conservation Heating), used in archive storage mostly. The heating should be activated if the temperature falls below 10° C and turned off if exceeds 25°C, regardless of RH, which is easily achievable by temperature setpoints with thermostat control. However, the heating also switched on/off based on the value of RH (45%-55%). The strategy of the control is attached in the picture.

Flowchart of Conservation Heating

Currently, I am using DesignBuilder v6 to achieve these indoor climate setpoints. I am looking for a possible way to control heating using a humidistat.

Please let me know if anyone knows this.



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answered 2021-09-08 09:18:25 -0500

The only way I know to achieve this control is using EMS. The EMS program would be rather simple and there are several examples and documentation to aid in the programming. See example files EMS*.idf and documentation EMSApplicationGuide.pdf.

The simple EMS program would basically use: if RH > RHmax, heater on (usually by raising the zone thermostat set point temperature) and then RH < RHmin, heater off (usually be resetting the zone thermostat set point temperature to NULL).

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Asked: 2021-09-08 02:37:44 -0500

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Last updated: Sep 08 '21