Additionally, a weighting factor database was generated to help correct for previous inaccuracies. In 1988 Research Project 472 worked to correct these oversights with the introduction of a classification system for walls, roofs, and zones. Research completed in 1984 revealed some factors which were not accounted for in the original publication of the method these findings were a result of the research project 359. History After its introduction in the 1979 handbook, research continued on increasing the accuracy of the CLTD/CLF method. Error when using the CLTD/CLF/SCL method tends to be less than twenty percent over and less than ten percent under. This second edition of Load Calculation Applications Manual, available in both I-P and SI units, is an in-depth, applications-oriented reference that provides clear understanding of the state of the art in heating and cooling load calculation methods, plus the tool and resources needed to implement them in practice. This method was developed as a simpler calculation alternative to difficult and unwieldy calculation methods such as the transfer function method and the method. CLTD/CLF/SCL cooling load calculation method The CLTD/CLF/SCL (cooling load temperature difference/cooling load factor/solar cooling load factor) calculation method was first introduced in the 1979 Cooling and Heating Load Manual (GRP-158) The CLTD/CLF/SCL Method is regarded as a reasonably accurate approximation of the total heat gains through a building envelope for the purposes of sizing equipment.
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