I am attempting to control the surface temperature of a radiant slab by turning flow on and off through an active layer. The active layer receives a fluid of variable temperature. The allowable temperature range of the surface must be pretty small to achieve thermal comfort -- within a couple degrees.
At first I tried using a simple Type2b differential controller, where the heating setpoint is the Upper Temperature and the slab surface temperature is the Lower Temperature. However, it doesn't seem like it is responding. I do anticipate a problem with this regardless because of the thermal lag of the concrete slab. Which controller within the TESS or standard TRNSYS library would work best? Thanks.
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Brad Painting
Master of Science Candidate, Renewable Energy Engineering
Department of Technology & Environmental Design
Appalachian State University
Boone, NC 28608