Cristiano's profile - activity

I see. I raised the air flow rate and it worked. In this example I used a cooling capacity of 5274 W (12000 BTU/hr) and

I'm using the HVACTemplate:Zone:PTHP template to estimate the cooling and heating loads of a AC split unit with COP of 3.29 and thermal capacity of 12000 BTU during one year and I'm getting the following warnings:

** Warning ** Calculated design heating load for zone=DORM2 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
   ************* SizeDXCoil: Potential issue with equipment sizing for Coil:Cooling:DX:SingleSpeed DORM2 PTHP COOLING COIL
   **   ~~~   ** User-Specified Gross Rated Total Cooling Capacity [W] = 3516.00000
   **   ~~~   ** differs from Design Size Gross Rated Total Cooling Capacity [W] = 2960.30983
   **   ~~~   ** This may, or may not, indicate mismatched component sizes.
   **   ~~~   ** Verify that the value entered is intended and is consistent with other components.
   ** Warning ** SizeHeatingCoil: : Potential issue with equipment sizing for Coil:Heating:Electric DORM2 PTHP SUPP HEATING COIL
   **   ~~~   ** ...Rated Total Heating Capacity = 0.00 [W]
   **   ~~~   ** ...Capacity used to size child component set to 0 [W]
   ************* Testing Individual Branch Integrity
   ************* All Branches passed integrity testing
   ************* Testing Individual Supply Air Path Integrity
   ************* All Supply Air Paths passed integrity testing
   ************* Testing Individual Return Air Path Integrity
   ************* All Return Air Paths passed integrity testing
   ************* No node connection errors were found.
   ************* Beginning Simulation
   ** Warning ** CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed "DORM2 PTHP COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 1.43 C.
   **   ~~~   **  ...Occurrence info = ANO, 01/01 00:00 - 00:05
   **   ~~~   ** ... 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 = 16.999 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.
   ************* Simulation Error Summary *************
   *************
   ************* ===== Recurring Error Summary =====
   ************* The following recurring error messages occurred.
   *************
   *************  ** Warning ** CalcDoe2DXCoil: Coil:Cooling:DX:SingleSpeed="DORM2 PTHP COOLING COIL" - Full load outlet temperature indicates a possibility of frost/freeze error continues. Outlet air temperature statistics follow:
   *************  **   ~~~   **   This error occurred 30222 total times;
   *************  **   ~~~   **   during Warmup 0 times;
   *************  **   ~~~   **   during Sizing 0 times.
   *************  **   ~~~   **   Max=1.999957  Min=0.6961

I believe that the first warning is not a problem once the weather file is from a very hot climate. What worries me is the third which indicates the possibility of coil frost/freeze. I believe the problem is because the constant cooling setpoint is set to 17 °C, but this is the value that I have to use. Does anyone know how I can fix this problem? are these warnings something to worry about? If someone wants to check the IDF file here it is: https://www.dropbox.com/s/xc8m9cedjgv...

PTHP Template: how to fix this warning: Full load outlet air dry-bulb temperature < 2C" I'm using the HVACTemplate:Zo

PTHP Template: how to fix this warning: Full load outlet air dry-bulb temperature < 2C" I'm using the HVACTemplate:Zo

PTHP Template: How to fix this error: "Gross Rated Total Cooling Capacity [W] will be limited by the maximum rated volum