Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

Revision history [back]

EnergyPlus calculates the inside/outside air film resistances during simulation so you don't need to specify these (see Construction).

If you want to enter the thermal performance yourself you can use the simplified Material:NoMass and/or WindowMaterial:SimpleGlazingSystem objects. However, the EnergyPlus documentation cautions against these because the effects of thermal mass are not considered - i.e. it assumes steady state heat transfer - and the results may differ significantly from the more detailed Material and WindowMaterial:Glazing objects.

Otherwise if you want to know the thermal performance of a Construction assembly pre-simulation you'll need to calculate it from each layer's properties (thickness, conductivity, etc), and then change one or more of these fields to match your target U-factor.

To confirm/view thermal performance post-simulation you can look in the Envelope Summary section of the eplustbl.htm file. Additionally, you can use/write an EnergyPlus Measure for OpenStudio to add additional output file formats and change the unit conversion from SI to IP (see the OutputControl:Table:Style object in the Input Output Reference PDF - it's not in Big Ladder's online version).

EnergyPlus calculates the inside/outside air film resistances during simulation so you don't need to specify these (see Construction).

If you want to enter the thermal performance yourself you can use the simplified Material:NoMass and/or WindowMaterial:SimpleGlazingSystem objects. However, the EnergyPlus documentation cautions against these because the effects of thermal mass are not considered - i.e. it assumes steady state heat transfer - and the results may differ significantly from the more detailed Material and WindowMaterial:Glazing objects.

Otherwise if you want to know the thermal performance of a Construction assembly pre-simulation you'll need to calculate it from each layer's properties (thickness, conductivity, etc), and then change one or more of these fields to match your target U-factor.

To confirm/view thermal performance post-simulation you can look in the Envelope Summary Summary section of the eplustbl.htm file. Additionally, you can use/write an EnergyPlus Measure for OpenStudio to add additional output file formats and change the unit conversion from SI to IP (see the OutputControl:Table:Style object in the Input Output Reference PDF - it's not in Big Ladder's online version).

EnergyPlus calculates the inside/outside air film resistances during simulation so you don't need to specify these (see Construction).

If you want to enter the thermal performance yourself you can use the simplified Material:NoMass and/or WindowMaterial:SimpleGlazingSystem objects. However, the EnergyPlus documentation cautions against these because the effects of thermal mass are not considered - i.e. it assumes steady state heat transfer - and the results may differ significantly from the more detailed Material and WindowMaterial:Glazing objects.

Otherwise if you want to know the thermal performance of a Construction assembly pre-simulation you'll need to calculate it from each layer's properties (thickness, conductivity, etc), and then change one or more of these fields to match your target U-factor.

To confirm/view thermal performance post-simulation you can look in the Envelope Summary section of the eplustbl.htm file. Additionally, you can use/write an EnergyPlus Measure for OpenStudio to add additional output file formats and change the unit conversion from SI to IP (see the OutputControl:Table:Style object in the Input Output Reference PDF - it's not in Big Ladder's online version).

EnergyPlus calculates the inside/outside air film resistances during simulation so you don't need to specify these (see Construction).

If you want to enter the thermal performance yourself you can use the simplified Material:NoMass and/or WindowMaterial:SimpleGlazingSystem objects. However, the EnergyPlus documentation cautions against these because the effects of thermal mass are not considered - i.e. it assumes steady state heat transfer - and the results may differ significantly from the more detailed Material and WindowMaterial:Glazing objects.

Otherwise if you want to know the thermal performance of a Construction assembly pre-simulation you'll need to calculate it from each layer's properties (thickness, conductivity, etc), and then change one or more of these fields to match your target U-factor.

To confirm/view thermal performance post-simulation you can look in the Envelope Summary section of the eplustbl.htm file. Additionally, you can use/write an EnergyPlus Measure Measure (see the Measure Writing Guide) for OpenStudio to add additional output file formats and change the unit conversion from SI to IP (see the OutputControl:Table:Style object in the Input Output Reference PDF - it's not in Big Ladder's online version).

EnergyPlus calculates the inside/outside air film resistances during simulation so you don't need to specify these (see Construction).

If you want to enter the thermal performance yourself you can use the simplified Material:NoMass and/or WindowMaterial:SimpleGlazingSystem objects. However, the EnergyPlus documentation cautions against these because the effects of thermal mass are not considered - i.e. it assumes steady state heat transfer - and the results may differ significantly from the more detailed Material and WindowMaterial:Glazing objects.

Otherwise if you want to know the thermal performance of a Construction assembly pre-simulation you'll need to calculate it from each layer's properties (thickness, conductivity, etc), and then change one or more of these fields to match your target U-factor.

To confirm/view thermal performance post-simulation you can look in the Envelope Summary section of the eplustbl.htm file. Additionally, you can use/write an EnergyPlus Measure for OpenStudio (see the Measure Writing Guide) for OpenStudio to add additional output file formats and change the unit conversion from SI to IP (see the OutputControl:Table:Style object in the Input Output Reference PDF - it's not in Big Ladder's online version).