I have started my simulation and It shows the following warning and I am not sure what is it and what to do about it.
I have trying to set up a DOAS System
First of all, I am not very sure what are these errors come from and how can I solve it?
* Warning * SimHVAC: Maximum iterations (20) exceeded for all HVAC loops, at HONG KONG SAR CHN CityUHK-45007 WMO#=450070, 01/01 03:15 - 03:30
* ~~~ * The solution for one or more of the Air Loop HVAC systems did not appear to converge
* ~~~ * Air System Named = DOAS did not converge for mass flow rate
* ~~~ * Check values should be zero. Most Recent values listed first.
* ~~~ * Demand-to-Supply interface mass flow rate check value iteration history trace: 0.421904,0.571668,0.774595,1.049554,1.422117,4.239839,0.421904,0.571668,0.774595,1.049554,
* ~~~ * Supply-to-demand interface deck 1 mass flow rate check value iteration history trace: 0.421904,0.571668,0.774595,1.049554,1.422117,0.311375,0.421904,0.571668,0.774595,1.049554,
* ~~~ * Air System Named = DOAS did not converge for temperature
* ~~~ * Check values should be zero. Most Recent values listed first.
* ~~~ * Demand-to-Supply interface temperature check value iteration history trace: 3.462632E-002,2.555499E-002,1.886016E-002,1.391922E-002,1.027269E-002,0.103233,3.462632E-002,2.555499E-002,1.886016E-002,1.391922E-002,
* ~~~ * Supply-to-demand interface deck 1 temperature check value iteration history trace: 2.555499E-002,1.886016E-002,1.391922E-002,1.027269E-002,0.103233,3.462632E-002,2.555499E-002,1.886016E-002,1.391922E-002,1.027269E-002,
* ~~~ * Air System Named = DOAS did not converge for energy
* ~~~ * Check values should be zero. Most Recent values listed first.
* ~~~ * Demand-to-Supply interface energy check value iteration history trace: 9612.881052,13025.189533,17648.773708,23913.603146,32402.274792,96602.722233,9612.881052,13025.189533,17648.773708,23913.603146,
* ~~~ * Supply-to-demand interface deck 1 energy check value iteration history trace: -9612.881052,-13025.189533,-17648.773708,-23913.603146,-33006.735202,-7094.521112,-9612.881052,-13025.189533,-17648.773708,-23913.603146,
This is my next warnings are the following As This is a DOAS System I am not sure how to adjust the input to Energyplus Yes, !- Use Outdoor Air DX Cooling Coil 7.2; !- Outdoor Air DX Cooling Coil Leaving Minimum Air Temperature {C} The maximum Outdoor Air DX Cooling Coil Leaving Minimum Air Temperature is 7.2C But What If my leaving air temperature is larger than 7.2? Can it still be a DOAS Coil?
* Warning * CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed "DOAS COOLING COIL 1" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -1.12 C. * ~~~ * ...Occurrence info = HONG KONG SAR CHN CityUHK-45007 WMO#=450070, 01/02 08:00 - 08:04 * ~~~ * ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil * ~~~ * 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 16.701 C. * ~~~ * 2) may have a low air flow rate per watt of cooling capacity. Check inputs. * ~~~ * 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs. * Warning * CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed "DOAS COOLING COIL 2" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -0.27 C. * ~~~ * ...Occurrence info = HONG KONG SAR CHN CityUHK-45007 WMO#=450070, 01/04 08:00 - 08:03 * ~~~ * ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil * ~~~ * 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 12.178 C. * ~~~ * 2) may have a low air flow rate per watt of cooling capacity. Check inputs. * ~~~ * 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.
