humidity control with sensible heating

answered 2018-02-10 21:05:01 -0500

This is a unique request as sensible only heating cannot remove moisture from a zone. It could control RH by heating the space to result in lower RH (i.e., zone condition state point moves right on a psyc chart), but that would be very uncomfortable. The typical method would be to activate a cooling coil and remove moisture from the zone, and reheat if necessary.

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Its quite specific, but not unique. The requirement is not driven by confort so temperature is not an issue... At least not in the climate im working on. I understand you can dehumidify with a cooling coil or a desiccant system but im after sensible heating strategy, commonly known as "conservation heating". I could calculate an hourly setpoint with some psyc calcs, but it means I need to do it for every infiltration option I ran... I was wondering if there was a way to size and control a heating coil based on RH and not on temp.

Any thoughts?

Santiago Velez ( 2018-02-12 12:26:41 -0500 )edit

If you simulate a heating coil based on outlet node set point then you could use EMS to perform the psychrometric calculations and adjust the heating coil outlet node set point as you need.