HVAC Templates - System Heating/Cooling

System tab on HVAC Templates Dialog.

The data on this tab is divided into 'System' (i.e. whole system data), 'Heating' and 'Cooling'.

Auxiliary energy - defines the energy consumption of fans, pumps and other auxiliary equipment when using the 'Simple' HVAC model option. This energy is assumed to be consumed during periods when either heating or cooling systems are operating.

Type - defines the EnergyPlus compact system type when the 'Compact' HVAC model option is set. Select from:

• Unitary single zone - for modelling 'window' air conditioning units and any other system which does not use ducted air
• Unitary multizone - for modelling constant volume air conditioning systems.
• VAV - for modelling variable air volume air conditioning systems.

When using the VAV compact system type you can define the system in more detail using:

• Outside air control type - select either 'Fixed' or 'Proportional'. 'Fixed means that the minimum outside air flow rate is fixed no matter what the actual system flow rate is. Proportional means the minimum outside air flow rate varies in proportion to the total system air flow rate.
• Supply air min flow fraction - is the fraction that the zone VAV box can reduce to based on the supply air maximum flow rate.

Heating/cooling system CoP is the whole system seasonal coefficient of performance including distribution losses when using the 'Simple' HVAC model option.

Boiler/chiller CoP is the seasonal coefficient of performance of the boiler/chiller, excluding any energy consumption by fans, pumps etc and excluding distribution losses..