If these temperatures are known along with the cfm air flow rate through the coil, the cooling capacity of a unit can be verified. Using the dry and wet bulb temperature information, two points can be located on a psych chart and the corresponding enthalpy values read for them. The total btuh cooling capacity can then be determined by multiplying 4.5 times the cfm value times the enthalpy difference of the two air state points. Contractors often have to perform this calculation to prove that their equipment is working properly on a problem job. Computer software cannot do anything to help the temperature measuring aspect of psychrometric analysis.
Somebody still has to access the air handler and take temperature readings.
However, software can greatly aid in the analysis and handling of psychrometric data. With a conventional psych chart, the contractor must use a straight edge and pencil to plot lines and read data. The whole affair is very imprecise as the width of a pencil lead can cause significant error. In addition, most psych charts are printed for sea level barometric pressure. If a project is located thousands of feet above sea level, the standard psych chart cannot be reliably used.