NA-04-9-1 – Application of Conduction Transfer Functions and Periodic Response Factors in Cooling Load Calculation Procedures ✓ Most Recent

This paper presents an overview of the conduction transfer function (CTF) and periodic response factor (PRF) methods of calculating conductive heat transfer. Different forms of the equations used in cooling load calculations are compared and contrasted. Particular attention is given to the methods included in the ASHRAE Loads Toolkit. The toolkit contains the source code for ASHRAE’s new load calculation methods, the heat balance method (HBM) and the radiant time series method (RTSM). Each method uses a similar, but different, conduction calculation technique.The HBM uses CTFs and the RTSM uses PRFs. Since there are limited numbers of CTFs and PRFs in the literature, the toolkit algorithms provide a means of calculating CTFs and PRFs for stand-alone computer programs or for generating CTF and PRF libraries. This paper describes the CTF and PRF algorithms in the toolkit and demonstrates implementation of the toolkit modules in a program that calculates CTFs and PRFs.

Units: Dual