Manual S Performance Data Example 5

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Manual S Performance Data Example 5

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Here's an example of entering values from a typical manufacturer's air conditioner or heat pump cooling performance data table into the Manual S Cooling Performance Data page.  The cells with shaded colors in the performance data table correspond to the colored input cells in the screenshot that follows.


Example 5

In this example none of the values in the Design column of the Interpolation Conditions area of this page exactly match any of the parameters of the manufacturer's table.  For example, the outdoor dry bulb is 99 degrees, but the table has 95 and 105 degree sections.  So we need to keep each of the Interpolation Conditions checkboxes checked, and fill in all 32 inputs in the Interpolation Values table (you only ever need to fill in 2 of the 4 columns under Sensible Capacity).

Since the "MBh" rows (total capacity) in the manufacturer's table shows values in units of 1000 Btuh, set the Capacity Units to MBtuh (it's also sometimes called MBH or KBtuh).  That way we can enter the numbers exactly as they appear in the table.

For the inputs under Sensible Capacity we only need to enter the values shown in the S/T columns, since this manufacturer's table has rows labeled "S/T".

With this table we needed to make another slight compromise in entering the data.  Since the "IDB" parameter (indoor dry bulb), shown at the far left of the table, includes all values within the table values to the right of it, that means the total capacity and power input values all correspond to that entering dry bulb value.  So this table really consists of several individual sub-tables, each corresponding to a particular entering dry bulb temperature.  But our page is set up with the total capacity and power input values being entered independently from entering dry bulb.  So we have to choose which sub-table to use.  Our entering dry bulb is 74, which is closer to the 75 sub-table than it is the 70 sub-table, so we chose to use the 75 sub-table for all values except for the EDB Low column of inputs.

The Interpolation Results boxes show that the selected unit's total capacity is 98% of the total load, and its sensible capacity is 100% of the sensible load.


Manufacturer's Performance Data Table:


Manual S Performance Data Page: