Summary Cooling Design Table

The Summary tab on the Cooling design screen shows a summary of maximum loads with some display options.

Summary Display Options

Data

Summary results can be displayed either for the time and month of the overall maximum building cooling load or for the individual zone.

• 1-Non-coincident - Summary results are for the time and month of maximum cooling load for each zone.
• 2-Coincident - All summary results are for the time and month of the maximum building total cooling load.

Totals calculation method

You can sum total loads in 2 different ways

• 1-Building - loads are summed for the whole building.
• 2-Cooling system - loads are summed for each Cooling system type allowing you to calculate system/block loads for sizing AHUs.

Summary Results

The Summary screen, 1-Zones display option shows design cooling loads and flow rates for each zone plus other related data.

• Design Capacity, shown in bold, is the maximum value of Total Cooling Load and Sensible multiplied by the Design margin to give the design cooling capacity of the equipment. This value is written into the Cooling capacity Model data on the HVAC tab if the appropriate Plant sizing Model Option is set.
• Design Flow Rate, shown in bold, is the flow rate required to deliver the Sensible cooling load using the Design supply temperature and the zone air temperature at the time of the maximum load multiplied by the Design margin.
• Total Cooling Load is the total maximum Sensible + Latent loads for the zone at the time of maximum Sensible Cooling load. If latent load is negative then it is ignored here and the Total Cooling Load is the same as the Sensible load.
• Sensible is the maximum Sensible Cooling load for the zone in the Design day.
• Latent is the latent load for the zone at the time of maximum Sensible load, calculated as Total Cooling - Sensible Cooling.
• Air Temperature is the Air temperature in the zone at the time of maximum Sensible load.
• Humidity is the humidity (%) in the zone at the time of maximum Sensible load.
• Time of Max Cooling - the time at which the maximum sensible cooling occurs.
• Max Op Temp in Day is the maximum operative temperature in the zone (using radiant fraction = 0.5) over the design day including periods when the zone may be unconditioned.
• Floor area is the floor area of the zone.
• Volume is the volume of the zone.
• Flow/Floor area (MBH/ft2 in IP units) is the Design Flow Rate divided by the Floor area of the zone. It provides a useful check for the flow rates calculated.

Tip: Use the Export command to export summary data to spreadsheet format.