Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Water cooling coils are reverse action ... more flow = lower outlet temp. The warning shows the sensed (air) temp = 9.3 C. The actuator (water) temp = 9.36 C. The set point temp = 8.57 C. With a water temp higher than the air temp, and also higher than the set point temp, there is no way to get to the set point temp of 8.57 C, and thus the warning. So to resolve this, look to see why the plant cannot supply, or maintain, a colder supply temperature. Also, a coil entering air temp of 9C if pretty low so then why would you need cooling? It's certainly possible, but then also is using an economizer in some situations. Make sure you actually need the cooling coil to turn on at this point in the simulation.
| | 2 | No.2 Revision |
Water cooling coils are reverse action ... more flow = lower outlet temp. The warning shows the sensed (air) temp = 9.3 C. The actuator (water) temp = 9.36 C. The set point temp = 8.57 C. With a water temp higher than the air temp, and also higher than the set point temp, there is no way to get to the set point temp of 8.57 C, and thus the warning. So to resolve this, look to see why the plant cannot supply, or maintain, a colder supply temperature. Also, a coil entering air temp of 9C if is pretty low so then why would you need cooling? It's certainly possible, but then also is using an economizer in some situations. Make sure you actually need the cooling coil to turn on at this point in the simulation.
