General Summary
Update the latent degradation model available for some cooling coils (like Coil:Cooling:DX) to be used with cycling fans. Currently it only applies for continuous fans (with cycling compressors), as described here.
Detailed Description
The current EnergyPlus latent degradation model uses 1996 work by Henderson. Don Shirey and Hugh updated the model in 2006 and can account for cycling blowers.
The updated model accounts for latent removal during coil start-up, and moisture re-introduced to the conditioned space during the blower-off delay (forced evaporation) and during the remaining off cycle time after the blower shuts off (natural evaporation). The blower-off delay is a control setting in which the fan runs for a period of time after the compressor turns off, in order to recover more sensible cooling from the system.
Possible Implementation
We have an EMS program implemented in OpenStudio-HPXML that models latent degradation for cycling fans. Maybe this can be referenced for the EnergyPlus implementation, or compared against for testing purposes.
General Summary
Update the latent degradation model available for some cooling coils (like
Coil:Cooling:DX) to be used with cycling fans. Currently it only applies for continuous fans (with cycling compressors), as described here.Detailed Description
The current EnergyPlus latent degradation model uses 1996 work by Henderson. Don Shirey and Hugh updated the model in 2006 and can account for cycling blowers.
The updated model accounts for latent removal during coil start-up, and moisture re-introduced to the conditioned space during the blower-off delay (forced evaporation) and during the remaining off cycle time after the blower shuts off (natural evaporation). The blower-off delay is a control setting in which the fan runs for a period of time after the compressor turns off, in order to recover more sensible cooling from the system.
Possible Implementation
We have an EMS program implemented in OpenStudio-HPXML that models latent degradation for cycling fans. Maybe this can be referenced for the EnergyPlus implementation, or compared against for testing purposes.