G
I'm programming a DDC for air conditioning control and am required to use enthalpy in the economy mode. The spec is very brief and they are relying on me to come up with the strategy.
I haven't done this before and I'm quite green. Any information would be a great help please!
I have an outside air temperature and relative humidity sensor and I have a function block that calculates the enthalpy in btu/lbm or kj/kg.
My basic understanding is that this should operate much the same as a simple temperature economy mode:
If outside air temp < set point, open outside air damper and close return air damper.
If outside air temp > set point, close outside air damper to minimum and open return air damper.
Is this correct? Any comments or advice on this matter? They have specified modulating dampers (not just open and closed) so I was thinking I would modulate the dampers over a small span over set point. For example modulate from (set point * 0.9) to (set point * 1.1), that is 90% set point to 110% set point. Is this reasonable?
Also what would be a good default set point to program in for the enthalpy?
Many thanks,
GreenAz
I haven't done this before and I'm quite green. Any information would be a great help please!
I have an outside air temperature and relative humidity sensor and I have a function block that calculates the enthalpy in btu/lbm or kj/kg.
My basic understanding is that this should operate much the same as a simple temperature economy mode:
If outside air temp < set point, open outside air damper and close return air damper.
If outside air temp > set point, close outside air damper to minimum and open return air damper.
Is this correct? Any comments or advice on this matter? They have specified modulating dampers (not just open and closed) so I was thinking I would modulate the dampers over a small span over set point. For example modulate from (set point * 0.9) to (set point * 1.1), that is 90% set point to 110% set point. Is this reasonable?
Also what would be a good default set point to program in for the enthalpy?
Many thanks,
GreenAz