Cooling

The mechanism for cooling and ventilation. Select Air conditioning, Mechanical ventilation or Natural ventilation. This setting determines the options available for the calculation of auxiliary energy, and categorizes the system for UK compliance and certification. When Mechanical Ventilation is selected, the rooms receiving mechanical ventilation should be indicated at room level on the Space Data System tab, under the heading ‘Ventilation & exhaust’.

The meter supplying the cooling system – most commonly an electricity meter. This setting is used to total fuel consumptions and determine carbon emissions.

The Energy Efficiency Ratio of the chiller or other cooling source generator under rated (applies to UK NCM only).

The seasonal Energy Efficiency Ratio of the chiller or other cold source generator.

Efficiency of delivering the cooling energy to the space

The system seasonal energy efficiency ratio of the chiller or other cold source generator plus the heat rejection pumps and fans.

The maximum load on the chiller or other cold source. An uneditable autosized parameter.

Tick this box if the cooling source is an absorption chiller. In this case the chiller will be assumed to take heat from the heating system. This may in turn be supplied by heat from the CHP plant.

Operation When a system has the cooling/ventilation mechanism set to air conditioning the option to define an absorption chiller is available on the cooling tab. When this is selected the heating tab gives the option to define a CHCP system.

This parameter is only required for UK regulations compliance and certification. For a changeover mixed mode system, indicate whether the free cooling is achieved by natural or mechanical ventilation. If the system is not a changeover mixed mode system, use the setting ‘Not a CMM system’.

Heat rejection pump and fan power, expressed as a percentage of heat rejected by the chiller.