Cooling Load Calculations and Principles



TABLE OF CONTENTS
1.0 OBJECTIVE………..2
2.0 TERMINOLOGY……………………………….2
3.0 SIZING YOUR AIR-CONDITIONING SYSTEM………………………………4
3.1 HEATING LOAD V/S COOLING LOAD CALCULATIONS……………..5
4.0 HEAT FLOW RATES…………………….5
4.1 SPACE HEAT GAIN………………………………………….6
4.2 SPACE HEAT GAIN V/S COOLING LOAD (HEAT STORAGE EFFECT). .7
4.3 SPACE COOLING V/S COOLING LOAD (COIL)……………………………..8
5.0 COMPONENTS OF COOLING LOAD…………………………………………….8
6.0 COOLING LOAD CALCULATION METHOD…………………9
6.1 ACCURACY AND RELIABILITY OF VARIOUS CALCULATION METHODS..9
7.0 DESIGN INFORMATION……………………………………………………………………………………10
7.1 OUTDOOR DESIGN WEATHER CONDITIONS…………………………………..10
7.2 INDOOR DESIGN CONDITIONS AND THERMAL COMFORT…………………..12
7.3 INDOOR AIR QUALITY AND OUTDOOR AIR REQUIREMENTS…………………13
7.4 BUILDING PRESSURIZATION………………………………………………….13
7.5 BUILDING CHARACTERISTICS…………………………………………………………..14
7.6 OPERATING SCHEDULES……………………………………………….14
8.0 COOLING LOAD METHODOLOGY – CONSIDERATIONS & ASSUMPTIONS……………….14
8.1 THERMAL ZONING……………………………..15
9.0 CLTD/SCL/CLF METHOD OF LOAD CALCULATION (ASHRAE FUNDAMENTALS 1997)………………………………………..16
9.1 EXTERNAL COOLING LOAD……………………………….16
9.2 INTERNAL COOLING LOADS…………………………………….25
9.3 HEAT GAIN FROM MISCELLANEOUS SOURCES……………..30
10.0 SUPPLY AIR CALCULATIONS………………………………………………………32
11.0 EXAMPLE…………………………..33
11.1 COOLING LOAD EXAMPLE IN US UNITS………………………………………33
11.2 COOLING LOAD EXAMPLE IN METRIC UNITS……………………………53

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