I run my models with the E+ HVAC Template HVACTemplate:System:UnitaryHeatPump:AirToAir and it show smany warnings of possible coil frost/freeze. What can I do to avoid this? I am not an HVAC engineer that's the reason why I am using a template. I am wondering if these warnings are influencing the total energy performance of the model? I am simulating different passive design and comparing their HVAC consumption.
* Warning * CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed "ROOMWEST AIRTOAIR HEATPUMP COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 0.49 C. * ~~~ * ...Occurrence info = DOUBLE COTTAGE, 01/02 12:00 - 12:01 * ~~~ * ... 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 = 23.699 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. .... *** ===== Recurring Error Summary =====
*** The following recurring error messages occurred.
*** *** * Warning * CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed="ROOMWEST AIRTOAIR HEATPUMP COOLING COIL" - Full load outlet temperature indicates a possibility of frost/freeze error continues. Outlet air temperature statistics follow: *** * ~~~ * This error occurred 1903 total times; *** * ~~~ * during Warmup 0 times;
*** * ~~~ * during Sizing 0 times. *** *
~~~ * Max=1.998861 Min=-2.133559
