Whenever cooling load calculations for equipment selection have been discussed by ASHRAE members, there have been generally two major suggestions made for revisions for procedures without the use of large memory high speed computers. One has been to simplify the procedure and the other has been to develop consistency of the results regardless of the procedure used. In response to these and other requests TC 4.1 Load Calculation Data and Procedures funded RP-138 to investigate the possibilities for an improved procedure. This paper is a report of the results obtained.

The major objective of this work was to simplify the method used without the necessity of having a digital computer available. For simplicity this method will be referred to as the manual method or the Total Equivalent Temperature Difference (TETD) Method. The same simplifications developed for the manual method can be put into a computer program, if desired.