The 'Internal Gains' tab displays the radiant proportion and view co-efficient for lighting, occupancy and equipment. for more information on these please read the section: Radiant Property Parameters.
This tab also displays the occupation parameters in a gains table.
Infiltration
The fresh air infiltration (leakage) into the zone expressed in air changes per hour (ACH). This can be influenced by setting an infiltration coefficient other than a value of 1 in Section: Heating Plantroom Controls.
Ventilation
The fresh air which enters the zone via a mechanical ventilation system, expressed in air changes per hour (ACH). This parameter makes it possible for you to obtain an estimate of the total load on an air handling system serving the building without invoking the detailed air-conditioning analysis software.
Lighting Gain
The heat gain into the zone due to artificial lighting, expressed in Watts per unit floor area.
For buildings that have extract light fittings, only the proportion of lighting energy that enters the room should be defined.
Occupant Sensible Gain
The sensible heat gain into the zone due to the metabolism of the occupants, expressed in Watts per unit floor area.
Occupant Latent Gain
The latent heat or moisture gain into the zone due to the metabolism of the occupants, expressed in Watts per unit floor area.
Equipment Sensible Gain
The sensible heat gain into the zone due to equipment, expressed in Watts per unit floor area. The cooling effect of equipment such as that in supermarket refrigerated food display units may be input by entering a negative value.
Equipment Latent Gain
The latent heat or moisture gain into the zone due to equipment, expressed in Watts per unit floor area. Equipment which causes moisture removal can be specified by entering a negative value.
Pollutant Generation (g/h/m^2)
Measured in grams per hour per floor area, the pollutant generation parameter can be used to represent any type of pollutant.
This is in addition to the external air pollutant which has a default concentration of 350ppm by volume (you can edit this value on the Building Summary screen) and is able to enter a zone through something like an open window, by infiltration, or through a louvre, as well as by mechanical ventilation (as determined by the value you enter for Ventilation, measured in ACH).
The pollutant generation value can be set by entering a single value which will follow the scheduled hours (you will define and apply a schedule yourself, and the value will be used when the schedule value for a given hour is '1', otherwise the Setback value will be used). You can also use the Hourly option which requires you to enter a value at each hour of the day, or you can use the Yearly option, for which you will be required to input 8760 values, one for each hour of the year. For yearly profiles you should use a program like MS Excel to generate the profile, as you will then be able to copy and paste the values into Tas.
Do not apply a schedule if you have selected Hourly or Yearly.
Warning - in the above definitions, the area of the floor refers to the 'Floor Area' parameter in the Zones topic. If a zone extends upwards through many levels of the building, you should make sure that the figures entered are calculated accordingly.
For more details on how to edit these parameters, please read the section: Gains Table.