BuildingSurface:Detailed,
41A989, !- Name
Roof, !- Surface Type
INSULATION ABOVE DECK, !- Construction Name
Tenant 5, !- Zone Name
Outdoors, !- Outside Boundary Condition
, !- Outside Boundary Condition Object
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
, !- View Factor to Ground
4, !- Number of Vertices
-26.402536646104, 28.390207384233, 5.689600000000, !- X,Y,Z 1 {m}
-26.402536646104, 28.390207384233, 4.911994336072, !- X,Y,Z 2 {m}
-27.592535976135, 27.908390562012, 5.202118134911, !- X,Y,Z 3 {m}
-27.592535976135, 27.908390562012, 5.689600000000; !- X,Y,Z 4 {m}
======================
two (x,y) points at Z1=Z4, and the other two Z's are on the same vertical surface with 90 degree view angle.
Normally, there should be two parallel lines at different height. If the lines are not parallel, the surface has to be broken up into two triangles.
I do not use DesignBilder or OpenStudio, but is easy to fix using the EPlus MACRO.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: brent.griffith@xxxxxxxx
Date: Wed, 18 Jan 2012 14:11:56 -0700
Subject: RE: [EnergyPlus_Support] Warning for Coil:Cooling:DX:SingleSpeed
Those warnings are difficult to remove and can usually be ignored. It is rather common for interior zones with high internal gains and no infiltration to require cooling in the middle of winter. Real equipment might shut off or run heaters to protect the unit, but the simulation does not (yet) model that well so it issues the warning.
From a design perspective, getting those errors should suggest considering air-side economizing and that the real equipment will need to have cold-weather protection.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Laurent Kanago
Sent: Wednesday, January 18, 2012 11:21 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Warning for Coil:Cooling:DX:SingleSpeed
I saw this post earlier but I still don't understand why the DX cooling is running in the wintertime. I followed the example for Packaged Unitary systems and the thermostats are set. Is the problem the Cooling Coil Schedules? I would assume the the coiling coils should be allowed to stay "always on."
** Warning ** Coil:Cooling:DX:SingleSpeed "RTU-4 COOLING COIL" - Air-cooled condenser inlet dry-bulb temperature below 0 C. Outdoor dry-bulb temperature = -2.93
** ~~~ ** ... Occurrence info = CHICAGO WEATHER, 01/03 12:30 - 12:45
** ~~~ ** ... Operation at low ambient temperatures may require special performance curves.
** Warning ** Coil:Cooling:DX:SingleSpeed "RTU-5 COOLING COIL" - Air-cooled condenser inlet dry-bulb temperature below 0 C. Outdoor dry-bulb temperature = -2.80
** ~~~ ** ... Occurrence info = CHICAGO WEATHER, 01/03 12:45 - 13:00
** ~~~ ** ... Operation at low ambient temperatures may require special performance curves.
** Warning ** Coil:Cooling:DX:SingleSpeed "RTU-1 COOLING COIL" - Air-cooled condenser inlet dry-bulb temperature below 0 C. Outdoor dry-bulb temperature = -2.80
** ~~~ ** ... Occurrence info = CHICAGO WEATHER, 01/03 13:00 - 13:15
** ~~~ ** ... Operation at low ambient temperatures may require special performance curves.
** Warning ** Coil:Cooling:DX:SingleSpeed "RTU-3 COOLING COIL" - Air-cooled condenser inlet dry-bulb temperature below 0 C. Outdoor dry-bulb temperature = -2.80
** ~~~ ** ... Occurrence info = CHICAGO WEATHER, 01/03 13:00 - 13:15
** ~~~ ** ... Operation at low ambient temperatures may require special performance curves.
Any reply would help.
Thanks,
Laurent Kanago
Technology Director
Office: (312) 235-2225
Fax: (773) 989.8679
Cell: (312) 730-2419
5030 N. Marine Dr #807
Chicago, IL 60640
http://www.ecohillsolutions.com/
?Please consider the environment before printing this e-mail. Thank you.?
From: YuanLu Li <yli006@xxxxxxxxxxx>
Reply-To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Date: Wed, 28 Dec 2011 07:47:03 -0500
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Subject: RE: [EnergyPlus_Support] Warning for Coil:Cooling:DX:SingleSpeed
As indicated by the error message, you are running DX cooling in Winter. Jan 14 in Chicago.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: eee.javed@xxxxxxxxx
Date: Wed, 28 Dec 2011 12:32:54 +0000
Subject: [EnergyPlus_Support] Warning for Coil:Cooling:DX:SingleSpeed
Hi All,
I am trying to run DX cooling coil and getting following repetitive error , what could be the possible solution for the same.
** Warning ** Coil:Cooling:DX:SingleSpeed "SPACE5-1 PTAC COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = -4.83 C.
** ~~~ ** ...Occurrence info = Chicago Ohare Intl Ap IL USA TMY3 WMO#=725300, 01/14 08:38 - 08:45
** ~~~ ** ... 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 = 10.835 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 ** Coil:Cooling:DX:SingleSpeed "SPACE3-1 PTAC COOLING COIL" - Air-cooled condenser inlet dry-bulb temperature below 0 C. Outdoor dry-bulb temperature = -4.40
** ~~~ ** ... Occurrence info = Chicago Ohare Intl Ap IL USA TMY3 WMO#=725300, 01/14 10:00 - 10:15
** ~~~ ** ... Operation at low ambient temperatures may require special performance curves.
** Warning ** Coil:Cooling:DX:SingleSpeed "SPACE3-1 PTAC COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 8.52E-002 C.
** ~~~ ** ...Occurrence info = Chicago Ohare Intl Ap IL USA TMY3 WMO#=725300, 01/14 10:00 - 10:15
** ~~~ ** ... 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 = 15.011 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 ** Coil:Cooling:DX:SingleSpeed "SPACE1-1 PTAC COOLING COIL" - Air-cooled condenser inlet dry-bulb temperature below 0 C. Outdoor dry-bulb temperature = -4.40
** ~~~ ** ... Occurrence info = Chicago Ohare Intl Ap IL USA TMY3 WMO#=725300, 01/14 10:45 - 11:00
** ~~~ ** ... Operation at low ambient temperatures may require special performance curves.
** Warning ** Coil:Cooling:DX:SingleSpeed "SPACE1-1 PTAC COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 1.79 C.
** ~~~ ** ...Occurrence info = Chicago Ohare Intl Ap IL USA TMY3 WMO#=725300, 01/14 15:00 - 15:15
** ~~~ ** ... 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 = 15.972 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 ** Coil:Cooling:DX:SingleSpeed "SPACE5-1 PTAC COOLING COIL" - Low condenser dry-bulb temperature error continues...
************* ** ~~~ ** This error occurred 45 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=-2.8 [C] Min=-7.2 [C]
*************
************* ** Warning ** Coil:Cooling:DX:SingleSpeed "SPACE5-1 PTAC COOLING COIL" - Full load outlet temperature indicates a possibility of frost/freeze error continues. Outlet air temperature statistics follow:
************* ** ~~~ ** This error occurred 45 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=-2.888928 Min=-4.833602
*************
************* ** Warning ** Coil:Cooling:DX:SingleSpeed "SPACE3-1 PTAC COOLING COIL" - Low condenser dry-bulb temperature error continues...
************* ** ~~~ ** This error occurred 26 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=-2.8 [C] Min=-4.75 [C]
Any help is appreciated.
Thanks!
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