.AixLib.ThermalZones.HighOrder.Validation.ASHRAE140.UsersGuide

Information

The package AixLib.ThermalZones.HighOrder.Validation.ASHRAE140 consists of models for several comparative test cases according to the standard ASHRAE140.

All implemented comparative test cases refer to changes to the input specifications for Building Thermal Envelope and Fabric Load Tests.
The standard ASHRAE140 provides detailed descriptions of all test cases.

Base Case600 according to ASHRAE140

Case600 represents the base-building model, which is the basis for all following cases.
The base-building is a single-story, low-mass building with rectangular geometry, 48 m2 floor area and 12 m2 of south-facing windows.

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Case number Low Mass / High Mass
 Window Orientation Air Exchange Rate
[ach] 		Thermostat Control Internal Gains
[W] 		Solar Absorptance Infrared Emittance
600 Low Mass South 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp > 7°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: 0.6 		exterior: 0.6
interior: 0.6

Comparative test cases according to ASHRAE140

The following table describes the input specifications for all Building Thermal Envelope and Fabric Load Test Cases.

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Case number Low Mass / High Mass
 Window Orientation Air Exchange Rate
[ach] 		Thermostat Control Internal Gains
[W] 		Solar Absorptance Infrared Emittance
600 Low Mass South 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp > 7°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
620 Low Mass East/West 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp > 7°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
640 Low Mass South 0.41 23-7 h: Heat = ON IF Temp < 10°C
7-23 h: Heat = ON IF Temp < 20°C;
Cool = ON IF Temp > 27°C 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
650 Low Mass South 10.8 18-7 h: Vent fan = ON
7-18 h: Vent fan = OFF
Heating = always OFF
18-7 h:Cool = OFF
7-18 h: Cool =ON IF Temp>27°C 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
900 High Mass South 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp > 7°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
920 High Mass East/West 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp > 7°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
940 High Mass South 0.41 23-7 h: Heat = ON IF Temp < 10°C
7-23 h: Heat = ON IF Temp < 20°C;
Cool = ON IF Temp > 27°C 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
950 High Mass South 10.8 18-7 h: Vent fan = ON
7-18 h: Vent fan = OFF
Heating = always OFF
18-7 h:Cool = OFF
7-18 h: Cool =ON IF Temp > 27°C 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
220 Low Mass South (opak) 0 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		0 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.9
210 Low Mass South (opak) 0 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		0 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.1
230 Low Mass South (opak) 0.822 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		0 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.9
240 Low Mass South (opak) 0 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		200 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.9
250 Low Mass South (opak) 0 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		0 exterior: 0.9
interior: - 		exterior: 0.9
interior: 0.9
270 Low Mass South 0 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		0 exterior: 0.1
interior: 0.9 		exterior: 0.9
interior: 0.9
280 Low Mass South 0 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		0 exterior: 0.1
interior: 0.1 		exterior: 0.9
interior: 0.9
300 Low Mass East/West 0 Heat = ON IF Temp < 20°C
Cool ON IF Temp > 20°C 		0 exterior: 0.1
interior: 0.9 		exterior: 0.9
interior: 0.9
320 Low Mass South 0 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		0 exterior: 0.1
interior: 0.9 		exterior: 0.9
interior: 0.9
400 Low Mass South (opak) 0 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		0 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.9
395 Low Mass no window 0 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		0 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.9
410 Low Mass South (opak) 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		0 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.9
420 Low Mass South (opak) 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		200 exterior: 0.1
interior: - 		exterior: 0.9
interior: 0.9
430 Low Mass South (opak) 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: - 		exterior: 0.9
interior: 0.9
440 Low Mass South 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: 0.1 		exterior: 0.9
interior: 0.9
800 High Mass South (opak) 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: - 		exterior: 0.9
interior: 0.9
810 High Mass South 0.41 Heat = ON IF Temp < 20°C; otherwise Heat=OFF
Cool = ON IF Temp < 27°C; otherwise Cool = OFF 		200 exterior: 0.6
interior: 0.1 		exterior: 0.9
interior: 0.9

The following FreeFloating models refer to test cases that do not include mechanical heating or cooling of the building.

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Case number Low Mass / High Mass
 Window Orientation Air Exchange Rate
[ach] 		Thermostat Control Internal Gains
[W] 		Solar Absorptance Infrared Emittance
600FF Low Mass South 0.41 No mechanichal heating or cooling 200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
650FF Low Mass South 0.41 No mechanical heating/cooling
but vent fan :
18-7 Uhr Vent fan = ON
7-18 Uhr Vent fan = OFF 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
900FF High Mass South 0.41 No mechanichal heating or cooling 200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9
950FF High Mass South 0.41 No mechanical heating/cooling
but vent fan :
18-7 Uhr Vent fan = ON
7-18 Uhr Vent fan = OFF 		200 exterior: 0.6
interior: 0.6 		exterior: 0.9
interior: 0.9

Limitations

The simulated annual heating and cooling loads of Case 210, 250, 395, 430 cannot meet the statistical acceptance ranges given by ASHRAE140 (01.01.2021).
However, cases that do not perform according to the reference values should not be considered erroneous. They shall be used as indication for debugging purposes instead.

References

  • ASHRAE140-2017

Revisions

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