I am Modelling a CAV system in Energy plus. I am using Chiller. I am trying to put a set point near the Mixed air inlet or at the return air temperature. I want chilled water actuator to operate based on the thermostat temperature. software is not accepting chilled water actuator operation based on either return air temperature/Mixed air inlet. instead it is only accepting a cooling coil outlet based setpoint which is Fine for VAV systems but it cannot be the case for CAV systems. In CAV system the supply air temperature cannot remain constant. the supply air temperature keeps on changing depending upon the load that is prevailing inside the room (Return air temperature) other wise one will end up in overcooling if the setpoint is based on cooling coil outlet during part load conditions.
So Keeping the above thing in view, can any one suggest me how to place this controller ?
