Thermal Properties

Setting	Description
General	Contains settings used to define the default calculation standard and the default building and room types to be used for the proposed building. Standard Building type - Used to select from a catalog of building types. OpenBuildings Energy Simulator provides two building type catalogs based on the calculation standards from ASHRAE and CIBSE. The default calculation standard is defined in the Buildings Defaults. Room type - Used to select from a list of room types whose properties are applied to the rooms created for the conceptual building. Room types are determined by the Building type selected.
Constructions	Contains settings used to select from a catalog of material constructions to define the proposed building's surfaces. The available constructions are: Exposed wall Ground floor Exposed roof Internal floor/ceiling Glazing type U Value displays the U-Value for selected constructions. The U-Value comes from the fabric data associated with the material constructions. Units displays the U-Value default units which can be changed. Material Manager opens the Materials Manager which is used to view, create, modify and edit building constructions and materials.
Internal conditions	Contains settings used to define the thermal design parameters used for energy calculations and simulation. Winter Temperature - Sets the design temperature to be maintained. & Saturation - Sets the saturation percentage required to initialize humidity control during heating. Infiltration - Sets the number of air changes per hour produced by outdoor air flow into the zone from window/door openings and cracks in the exterior surfaces. The value displayed here is the minimum supply air volume rate to be maintained for peak heat loss load conditions. Note: Infiltration rates entered here are handled as an arithmetic average in steady state calculations. Summer Temperature - Sets the design temperature to be maintained. & Saturation - Sets the saturation percentage required to initialize humidity control during heating. Infiltration - Sets the number of air changes per hour produced by outdoor air flow into the zone from window/door openings and cracks in the exterior surfaces. The value displayed here is the minimum supply air volume rate to be maintained for peak heat loss load conditions. Note: Infiltration rates entered here are handled as an arithmetic average in steady state calculations. Internal heat Gains Internal gains - Defines an internal gains value to apply to each room created for the conceptual building. Room internal gains are attributed to other heat sources in the room. Lighting gains - Defines a lighting gains value to apply to each room created for the conceptual building. Room lighting gains are attributed to lighting that infiltrates into the room. Occupancy density - Defines an occupancy density value to apply to each room created for the conceptual building. Room occupancy determines heat gains attributed to the number of people occupying the space.

General

Contains settings used to define the default calculation standard and the default building and room types to be used for the proposed building.

Standard
Building type - Used to select from a catalog of building types. OpenBuildings Energy Simulator provides two building type catalogs based on the calculation standards from ASHRAE and CIBSE. The default calculation standard is defined in the Buildings Defaults.
Room type - Used to select from a list of room types whose properties are applied to the rooms created for the conceptual building. Room types are determined by the Building type selected.

Constructions

Contains settings used to select from a catalog of material constructions to define the proposed building's surfaces.

The available constructions are:

Exposed wall
Ground floor
Exposed roof
Internal floor/ceiling
Glazing type

U Value displays the U-Value for selected constructions. The U-Value comes from the fabric data associated with the material constructions.
Units displays the U-Value default units which can be changed.
Material Manager opens the Materials Manager which is used to view, create, modify and edit building constructions and materials.

Internal conditions

Contains settings used to define the thermal design parameters used for energy calculations and simulation.

Winter
- Temperature - Sets the design temperature to be maintained.
- & Saturation - Sets the saturation percentage required to initialize humidity control during heating.
- Infiltration - Sets the number of air changes per hour produced by outdoor air flow into the zone from window/door openings and cracks in the exterior surfaces. The value displayed here is the minimum supply air volume rate to be maintained for peak heat loss load conditions.
Note: Infiltration rates entered here are handled as an arithmetic average in steady state calculations.
Summer
- Temperature - Sets the design temperature to be maintained.
- & Saturation - Sets the saturation percentage required to initialize humidity control during heating.
- Infiltration - Sets the number of air changes per hour produced by outdoor air flow into the zone from window/door openings and cracks in the exterior surfaces. The value displayed here is the minimum supply air volume rate to be maintained for peak heat loss load conditions.
Note: Infiltration rates entered here are handled as an arithmetic average in steady state calculations.
Internal heat Gains
- Internal gains - Defines an internal gains value to apply to each room created for the conceptual building. Room internal gains are attributed to other heat sources in the room.
- Lighting gains - Defines a lighting gains value to apply to each room created for the conceptual building. Room lighting gains are attributed to lighting that infiltrates into the room.
- Occupancy density - Defines an occupancy density value to apply to each room created for the conceptual building. Room occupancy determines heat gains attributed to the number of people occupying the space.