Fluid Cooler and Chiller staging
It seems that this should be simpler.... I would like to model a chilled water cooling loop with a fluid cooler and chiller. The fluid cooler should operate at cold outdoor temps (eg, 3C and below). The air-cooled chiller should operate at higher outdoor temps (eg, > 3C)
Implementing that idea is eluding me after trying many options. It would be handy, for example, to use PlantEquipmentoperation:OutdoorDryBulb, but that is applicable only for condenser loops.
Can someone give a little guidance regarding a workable approach? Thanks very much.
I've made some progress using EMS. There are now two EMS:Programs, both of them change a schedule:compact value from 1 to 0 depending on the outdoor temperature. One changes schedule #1's value to zero when outdoor temp is BELOW 5C. the other changes schedule #2's value to zero when outdoor temp is ABOVE 5C.
For some reason, all works well when the outdoor temp >5C - only the chiller operates. Below 5C, however, BOTH the chiller and fluid cooler operate. The EMS:Programs report the correct schedule value, so something is allowing the fluid cooler to run >5C
Still hoping for help!