Heat transfer is energy transferred because of a temperaturedifference. Energy moves from a higher-temperature region to alower-temperature region by one or more of three modes: conduction, radiation,and convection. This chapter presents elementary principles of single-phaseheat transfer, with emphasis on HVAC applications. Boiling and condensation arediscussed in Chapter 5. More specific information on heat transfer to or from buildingsor refrigerated spaces can be found in Chapters 14 to 19, 23, and 27 of thisvolume and in Chapter 24 of the 2018

ASHRAEHandbook—Refrigeration. Physical properties of substances can be found inChapters 26, 28, 32, and 33 of this volume and in Chapter 19 of the 2018 ASHRAE Handbook—Refrigeration. Heattransfer equipment, including evaporators, condensers, heating and cooling coils,furnaces, and radiators, is covered in the 2020 ASHRAE Handbook—HVAC Systems and Equipment. For further information onheat transfer, see the Bibliography.

Heat Transfer Processes
Thermal Conduction
Thermal Radiation
Thermal Convection
Heat Exchangers
Heat Transfer Augmentation
Symbols

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