Comparison of Methods Used in Calculated of Cooling Loads: The Case of Elementary School

Abstract

Nowadays, in terms of continuity of indoor environment comfort conditions and decreased initial investment, maintenance and operating costs, selected of a appropriate cooling system is important in buildings. In the selection of cooling system, system capacity need to determine according to building cooling load. That cooling load is not calculated in the reliability way cause selected cooling system that is not suitable to building, increase cooling system cost and aggravation indoor environment comfort conditions. Therefore, the reliability calculation method should be used in the calculation of building cooling loads. There are several methods that calculates building cooling loads. In this study, TEDT/TA, HB, TFM, CLTD/SCL/CLF and RTS methods that are used commonly from this methods are compared according to their using data, coefficients and calculation procedure. The elementary school that is located in İstanbul is selected to compared of numerical differences among these methods and cooling loads of this building for July 21 that is design day are determined according to calculation templates prepared in MS Excel using TEDT/TA, TFM, CLTD/SCL/CLF and RTS methods. Obtained results are found difference between 5% and 25% according to building occupancy period.

Keywords

• Cooling load
• Total equivalent temperature difference
• Transfer function method
• Heat balance
• Cooling load temperature difference
• Radiant time series