ASHRAE F18-2009 (SI)

Heating and cooling load calculations are the primary design basis for most heating and air-conditioning systems and components. These calculations affect the size of piping, ductwork, dif-fusers, air handlers, boilers, chillers, coils, compressors, fans, and every other component of systems that condition indoor environments. Cooling and heating load calculations can significantly affect first cost of building construction, comfort and productivity of occupants, and operating cost and energy consumption. Peak design heating and cooling load calculations, which are this chapters focus, seek to determine the maximum rate of heating and cooling energy transfer needed at any point in time. Similar principles, but with different assumptions, data, and application, can be used to estimate building energy consumption, as described in Chapter 19. This chapter discusses common elements of cooling load calculation (e.g., internal heat gain, ventilation and infiltration, moisture migration, fenestration heat gain) and two methods of heating and cooling load estimation: heat balance (HB) and radiant time series(RTS).

Chapter Table of Contents

Cooling Load Calculation Principles
Internal Heat Gains
Infiltration and Moisture Migration Heat Gains
Fenestration Heat Gain
Heat Balance Method
Radiant Time Series (RTS) Method
Heating Load Calculations
System Heating and Cooling Load Effects
Example Cooling and Heating Load Calculations
Previous Cooling Load Calculation Methods
Building Example Drawings

ISBN: 978-1-933742-55-7
ISSN: 1523-7282

Units: SI

Citation: 2009 ASHRAE Handbook -- Fundamentals: Chapter 18, Nonresidential Cooling and Heating Load Calculations



Product Code(s): D-F182009SI

This product is related to: Radiant Time Series (RTS) Method Load Calculation Spreadsheets