前言 Unit One Lesson 1 Air Lesson 2 The Need of Air Conditioning Lesson 3 the Cleaning of air Lesson 4 Thermal Storage Unit Two Lesson 5 Fluid Lesson 6 Level Measurement Lesson 7 Measuring Rate of fluid flow Lesson 8 What Is Humidity Unit three Lesson 9 Control Valves Lesson 10 Liquid Pump Lesson 11 the Reciprocating Compressor Lesson 12 Heat Exchanger Unit Four Lesson 13 Thermodynamic Pronciples of Refrigeration Lesson 14 Mechanical Refrigeration Principles Lesson 15 Evaporation Lesson 16 Condensation Unit Five Lesson 17 Evaporative Air Cooling Lesson 18 Room Air Conditioner Lesson 19 Methods of Food Freezing Lesson 20 All-Air Systems Appendixes1 Version to Texts(译文) Appendixes2 Special Terms(专业术语) Appendixes3 Vocabulary (词汇) 参考文献