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Mechanical

Vent Air Changes Rate Standard

The vent air changes rate standard calculates the minimum ventilation flow rate based on various global options, such as CIBSE, ASHRAE, and Building Regulations, and is used to size ductwork and ensure adequate ventilation in the building.

Heating Air Changes Rate Standard

The heating air changes rate standard is used for calculating the air changes, which is used in the heat loss and heat gain calculations.

District Heating

This selection defines how the diversity in the district heating system is calculated.

Duct Sizing Method

Choose between three options for duct sizing:

  1. Maximum Velocity: Ensures the duct does not exceed a set maximum velocity.

  2. Maximum Pressure Drop: Ensures the duct does not exceed a set maximum pressure drop.

  3. Maximum Velocity and Pressure Drop: Ensures the duct does not exceed a set limit on both velocity and pressure drop.

Pipe Sizing Method

Choose between three options for pipe sizing:

  1. Maximum Velocity: Ensures the pipe does not exceed a set maximum velocity.

  2. Maximum Pressure Drop: Ensures the pipe does not exceed a set maximum pressure drop.

  3. Maximum Velocity and Pressure Drop: Ensures the pipe does not exceed a set maximum on both velocity and pressure drop.

Percentage of Ventilation Heat Loss Recovered

This setting is used when a mechanical ventilation heat recovery (MVHR) system will be on the project but not part of your design.

The total heat loss from air changes is adjusted accordingly by specifying a percentage of heat loss to recover (e.g., 50%).

Note this Setting is overridden if an MVHR system is on the design.

Ambient Temperature

The ambient temperature is used in the pipe heat load calculations.