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[EnergyPlus_Support] Simple Steady State simulation
Hi,
I am currently evaluating EnergyPlus as we hope to use it for
simulating the energy performance of a proposed new hospital building
in Dublin, Ireland. I have currently modelled a very simple concrete
cube for 2 design days, which have constant outdoor temperature. The
simulated inside zone temperature for both days is also constant but
about 4.5 degrees higher than the outdoor temperature. I expected the
temperatures to be the same, as there is no heat input to the
building. Is there a reason for the higher inside temperature or have
i modelled the building incorrectly?
Thank you in advance for your help.
Best regards
Colin Harris
Trinity College Dublin.
THE IDF FILE BELOW :-
!-Generator IDFEditor 1.05
!-NOTE: All comments with '!-' are ignored by the IDFEditor and are
generated automatically.
!- Use '!' comments if they need to be retained when using the
IDFEditor.
!- =========== ALL OBJECTS IN CLASS: VERSION ===========
VERSION,
1.0.1; !- Version Identifier
!- =========== ALL OBJECTS IN CLASS: BUILDING ===========
BUILDING,
hospital, !- Building Name
0, !- North Axis {deg}
Country, !- Terrain
.04, !- Loads Convergence Tolerance Value {W}
.004, !- Temperature Convergence Tolerance
Value {C}
MinimalShadowing; !- Solar Distribution
!- =========== ALL OBJECTS IN CLASS: TIMESTEP IN HOUR ===========
TIMESTEP IN HOUR,
4; !- Time Step in Hour
!- =========== ALL OBJECTS IN CLASS: INSIDE CONVECTION ALGORITHM
===========
INSIDE CONVECTION ALGORITHM,
Detailed; !- InsideConvectionValue
!- =========== ALL OBJECTS IN CLASS: OUTSIDE CONVECTION ALGORITHM
===========
OUTSIDE CONVECTION ALGORITHM,
Detailed; !- OutsideConvectionValue
!- =========== ALL OBJECTS IN CLASS: SKY RADIANCE DISTRIBUTION
===========
SKY RADIANCE DISTRIBUTION,
1; !- SkyRadianceValue
!- =========== ALL OBJECTS IN CLASS: SOLUTION ALGORITHM ===========
SOLUTION ALGORITHM,
CTF; !- SolutionAlgo
!- =========== ALL OBJECTS IN CLASS: SHADOWING CALCULATIONS
===========
SHADOWING CALCULATIONS,
20; !- Period_for_calculations
!- =========== ALL OBJECTS IN CLASS: ZONE VOLUME CAPACITANCE
MULTIPLIER ===========
ZONE VOLUME CAPACITANCE MULTIPLIER,
1; !- Capacitance Multiplier
!- =========== ALL OBJECTS IN CLASS: RUN CONTROL ===========
RUN CONTROL,
No, !- Do the zone sizing calculation
No, !- Do the system sizing calculation
No, !- Do the plant sizing calculation
Yes, !- Do the design day simulations
No; !- Do the weather file simulation
!- =========== ALL OBJECTS IN CLASS: LOCATION ===========
Location,
Dublin, !- LocationName
53.43, !- Latitude {deg}
-6.25, !- Longitude {deg}
0, !- TimeZone {hr (decimal)}
85; !- Elevation {m}
!- =========== ALL OBJECTS IN CLASS: DESIGNDAY ===========
DesignDay,
SummerDayDUB-IRL, !- DesignDayName
24.2, !- Maximum Dry-Bulb Temperature {C}
0, !- Daily Temperature Range {C}
17.2, !- Wet-Bulb Temperature At MaxTemp {C}
99433, !- Barometric Pressure {Pa}
0, !- Wind Speed {m/s}
221, !- Wind Direction {deg}
0, !- Sky Clearness
0, !- Rain Indicator
0, !- Snow Indicator
27, !- Day Of Month
7, !- Month
Friday, !- Day Type
0; !- Daylight Saving Time Indicator
DesignDay,
WinterDayDUB-IRL, !- DesignDayName
2, !- Maximum Dry-Bulb Temperature {C}
0, !- Daily Temperature Range {C}
0, !- Wet-Bulb Temperature At MaxTemp {C}
99433, !- Barometric Pressure {Pa}
0, !- Wind Speed {m/s}
221, !- Wind Direction {deg}
0, !- Sky Clearness
0, !- Rain Indicator
0, !- Snow Indicator
20, !- Day Of Month
1, !- Month
Friday, !- Day Type
0; !- Daylight Saving Time Indicator
!- =========== ALL OBJECTS IN CLASS: MATERIAL:REGULAR ===========
MATERIAL:REGULAR,
concreteWall, !- Name
MediumSmooth, !- Roughness
.3, !- Thickness {m}
1.7, !- Conductivity {W/m-K}
2240, !- Density {kg/m3}
836, !- Specific Heat {J/kg-K}
.9, !- Absorptance:Thermal
.7, !- Absorptance:Solar
.7; !- Absorptance:Visible
!- =========== ALL OBJECTS IN CLASS: CONSTRUCTION ===========
CONSTRUCTION,
wall, !- Name
concreteWall; !- Outside Layer
!- =========== ALL OBJECTS IN CLASS: ZONE ===========
ZONE,
cube, !- Zone Name
0, !- Relative North (to building) {deg}
0, !- X Origin {m}
0, !- Y Origin {m}
0, !- Z Origin {m}
1, !- Type
1, !- Multiplier
20, !- Ceiling Height {m}
70000; !- Volume {m3}
!- =========== ALL OBJECTS IN CLASS: SURFACEGEOMETRY ===========
SurfaceGeometry,
UpperLeftCorner, !- SurfaceStartingPosition
CounterClockWise, !- VertexEntry
relative; !- SurfaceGeometryKey
!- =========== ALL OBJECTS IN CLASS: SURFACE:HEATTRANSFER
===========
Surface:HeatTransfer,
southWall, !- User Supplied Surface Name
WALL, !- Surface Type
wall, !- Construction Name of the Surface
cube, !- InsideFaceEnvironment
ExteriorEnvironment, !- OutsideFaceEnvironment
, !- OutsideFaceEnvironment Object
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
.5, !- View Factor to Ground
4, !- Number of Surface Vertice Groups --
Number of (X,Y,Z) groups in this surface
0, !- Vertex 1 X-coordinate {m}
0, !- Vertex 1 Y-coordinate {m}
20, !- Vertex 1 Z-coordinate {m}
0, !- Vertex 2 X-coordinate {m}
0, !- Vertex 2 Y-coordinate {m}
0, !- Vertex 2 Z-coordinate {m}
50, !- Vertex 3 X-coordinate {m}
0, !- Vertex 3 Y-coordinate {m}
0, !- Vertex 3 Z-coordinate {m}
50, !- Vertex 4 X-coordinate {m}
0, !- Vertex 4 Y-coordinate {m}
20; !- Vertex 4 Z-coordinate {m}
Surface:HeatTransfer,
eastWall, !- User Supplied Surface Name
WALL, !- Surface Type
wall, !- Construction Name of the Surface
cube, !- InsideFaceEnvironment
ExteriorEnvironment, !- OutsideFaceEnvironment
, !- OutsideFaceEnvironment Object
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
.5, !- View Factor to Ground
4, !- Number of Surface Vertice Groups --
Number of (X,Y,Z) groups in this surface
50, !- Vertex 1 X-coordinate {m}
0, !- Vertex 1 Y-coordinate {m}
20, !- Vertex 1 Z-coordinate {m}
50, !- Vertex 2 X-coordinate {m}
0, !- Vertex 2 Y-coordinate {m}
0, !- Vertex 2 Z-coordinate {m}
50, !- Vertex 3 X-coordinate {m}
70, !- Vertex 3 Y-coordinate {m}
0, !- Vertex 3 Z-coordinate {m}
50, !- Vertex 4 X-coordinate {m}
70, !- Vertex 4 Y-coordinate {m}
20; !- Vertex 4 Z-coordinate {m}
Surface:HeatTransfer,
roof, !- User Supplied Surface Name
ROOF, !- Surface Type
wall, !- Construction Name of the Surface
cube, !- InsideFaceEnvironment
ExteriorEnvironment, !- OutsideFaceEnvironment
, !- OutsideFaceEnvironment Object
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
0, !- View Factor to Ground
4, !- Number of Surface Vertice Groups --
Number of (X,Y,Z) groups in this surface
0, !- Vertex 1 X-coordinate {m}
0, !- Vertex 1 Y-coordinate {m}
20, !- Vertex 1 Z-coordinate {m}
50, !- Vertex 2 X-coordinate {m}
0, !- Vertex 2 Y-coordinate {m}
20, !- Vertex 2 Z-coordinate {m}
50, !- Vertex 3 X-coordinate {m}
70, !- Vertex 3 Y-coordinate {m}
20, !- Vertex 3 Z-coordinate {m}
0, !- Vertex 4 X-coordinate {m}
70, !- Vertex 4 Y-coordinate {m}
20; !- Vertex 4 Z-coordinate {m}
Surface:HeatTransfer,
northWall, !- User Supplied Surface Name
WALL, !- Surface Type
wall, !- Construction Name of the Surface
cube, !- InsideFaceEnvironment
ExteriorEnvironment, !- OutsideFaceEnvironment
, !- OutsideFaceEnvironment Object
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
.5, !- View Factor to Ground
4, !- Number of Surface Vertice Groups --
Number of (X,Y,Z) groups in this surface
50, !- Vertex 1 X-coordinate {m}
70, !- Vertex 1 Y-coordinate {m}
20, !- Vertex 1 Z-coordinate {m}
50, !- Vertex 2 X-coordinate {m}
70, !- Vertex 2 Y-coordinate {m}
0, !- Vertex 2 Z-coordinate {m}
0, !- Vertex 3 X-coordinate {m}
70, !- Vertex 3 Y-coordinate {m}
0, !- Vertex 3 Z-coordinate {m}
0, !- Vertex 4 X-coordinate {m}
70, !- Vertex 4 Y-coordinate {m}
20; !- Vertex 4 Z-coordinate {m}
Surface:HeatTransfer,
westWall, !- User Supplied Surface Name
WALL, !- Surface Type
wall, !- Construction Name of the Surface
cube, !- InsideFaceEnvironment
ExteriorEnvironment, !- OutsideFaceEnvironment
, !- OutsideFaceEnvironment Object
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
.5, !- View Factor to Ground
4, !- Number of Surface Vertice Groups --
Number of (X,Y,Z) groups in this surface
0, !- Vertex 1 X-coordinate {m}
70, !- Vertex 1 Y-coordinate {m}
20, !- Vertex 1 Z-coordinate {m}
0, !- Vertex 2 X-coordinate {m}
70, !- Vertex 2 Y-coordinate {m}
0, !- Vertex 2 Z-coordinate {m}
0, !- Vertex 3 X-coordinate {m}
0, !- Vertex 3 Y-coordinate {m}
0, !- Vertex 3 Z-coordinate {m}
0, !- Vertex 4 X-coordinate {m}
0, !- Vertex 4 Y-coordinate {m}
20; !- Vertex 4 Z-coordinate {m}
Surface:HeatTransfer,
floor, !- User Supplied Surface Name
FLOOR, !- Surface Type
wall, !- Construction Name of the Surface
cube, !- InsideFaceEnvironment
ExteriorEnvironment, !- OutsideFaceEnvironment
, !- OutsideFaceEnvironment Object
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
1, !- View Factor to Ground
4, !- Number of Surface Vertice Groups --
Number of (X,Y,Z) groups in this surface
50, !- Vertex 1 X-coordinate {m}
0, !- Vertex 1 Y-coordinate {m}
0, !- Vertex 1 Z-coordinate {m}
0, !- Vertex 2 X-coordinate {m}
0, !- Vertex 2 Y-coordinate {m}
0, !- Vertex 2 Z-coordinate {m}
0, !- Vertex 3 X-coordinate {m}
70, !- Vertex 3 Y-coordinate {m}
0, !- Vertex 3 Z-coordinate {m}
50, !- Vertex 4 X-coordinate {m}
70, !- Vertex 4 Y-coordinate {m}
0; !- Vertex 4 Z-coordinate {m}
!- =========== ALL OBJECTS IN CLASS: REPORT VARIABLE ===========
Report Variable,
*, !- Key_Value
Outdoor Dry Bulb, !- Variable_Name
hourly; !- Reporting_Frequency
Report Variable,
*, !- Key_Value
Zone/Sys Air Temp[C], !- Variable_Name
hourly; !- Reporting_Frequency
!- =========== ALL OBJECTS IN CLASS: REPORT ===========
Report,
Surfaces, !- Type_of_Report
DXF; !- Name_of_Report
Report,
Variable Dictionary; !- Type_of_Report
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