Capacity: For cooling and heating operation, the Capacity (Qcdes and Qhdes, respectively) is defined as the cooling and heating capacity of the VRF outdoor unit at design conditions. This value may be autosized, in which case the design Capacity will account for the oversizing factor, as described above.
COP: For cooling and heating operation, the COP (COPcdes and COPhdes, respectively) is defined as the cooling and heating coefficient of performance of the VRF outdoor unit at design conditions. The COP is the ratio of cooling output at the evaporator in cooling mode or heat extracted from the condenser in heating mode relative to the compressor power input required to achieve these respective cooling and heating capacities. This value is derived for the design conditions based upon the performance curves and the COP at the reference conditions.
Average indoor unit coil entering wet-bulb temperature: This editable design entering air condition (Tawbdes) is the average entering air wet-bulb temperature seen by indoor unit coils for all indoor units connected to the VRF system currently selected for editing. In the case of water-source VRF systems, this design condition is defined only for cooling.
Average indoor unit coil entering dry-bulb temperature: This editable design entering air condition (Tadbdes) is the average entering air dry-bulb temperature seen by indoor unit coils for all indoor units connected to the VRF system currently selected for editing. This value is defined only for heating mode.
Entering source loop water temperature: This design source water temperature (Tewtdes) is derived separately for cooling and heating. The performance of the Source water loop (selected on the VRF system tab) at the time of peak cooling and heating loads during System equipment and plant sizing determines these values.
Combination ratio: This parameter describes the capacity of indoor units at the design condition relative to the capacity of the outdoor unit at the design condition. It is presented separately for cooling and heating operation, as VRF outdoor units normally have different cooling and heating capacities at design conditions.
