The Design Database package contains a number of calculation modules that allow for the introduction of conditioned air into a space.
The available options are:
These options relate to the following:
This option is for conditioning the room locally be means of fan coil units. Fresh air is not being introduced directly into the room, or at the main plant.
This option is for local conditioning via fan coils and the introduction of untreated air into the room.The untreated air could be introduced into the fan coil unit, directly into the room, or ceiling void.
This option is for local cooling in the room (fan coil units) but also have a fresh air requirement that is being managed by central plant.
The temperature of the primary fresh air must be specified. You can also set a humidity control for the primary fresh air if desired. The central plant will then be modeled based on the heating/cooling and humidify/dehumidify parameters.
When considering this option, individual room load results will be affected as the cooling on the primary fresh air will be considered. The plant results will display the fresh air conditioning loads.
This option is for all the conditioning at central plant with no local cooling. This could either be by recirculation or a full fresh air system. The illustration shows a recirculation system where primary fresh air is mixed with recirculation air then cooled to the defined supply temperature before being introduced to the room. With this option, room loads will not be affected as there is no requirement for local conditioning. The total plant loads will increase to indicate the fresh air load being handled.
Jose - While we welcome comment on Wiki content, the place to ask questions about the operation of the software is in the Forum section.
With regards your query - the room is affected by air from plant, but none of the plant load is considered in room results. As stated, this would be used for a recirculation or a full fresh air system.
I have a question related to the Fresh air loads. As the "Fresh Air From Central Plant With Conditioned Air" option doesn't affect the room loads, in which situation is useful to select this option? .... when I'd be doing something different rather than doing the calculation of the room loads?
Still find the inputs difficult to understand for this CIBSE Gain calculation.