Chapter hvac engineering Fundamentals: Part 1 Introduction

11.3.1
Rooftop AHU
The typical rooftop AHU is self-contained, although some are made
for use with external sources of thermal energy. The self-contained
system includes a direct-expansion cooling coil; a direct-fired heater,
usually gas or electric; a refrigerant compressor with an air-cooled
Equipment: Part 3
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