Author: Le Quang Huy - Nguyen Chi Thien

Central Air Conditioning System

Introduction

Central air conditioning system circulate cool air through a system of supply and return ducts. Supply ducts and registers (openings in the walls, floors, or ceilings covered by grills) carry cooled air from air conditioner to the interior. This cooled air become warmer as it through the interior. Then, it flows back to the central air conditioner through return ducts and registers.

The major parts in central air conditioning system are: compressor, condenser coil, evaporator coil, air handling unit, fan and air filters.

Learning Objectives / Experiments

- Principle of central air conditioning system and its main components.

- Recirculating and outer air operation.

- Changes of state in the h-x diagram for humid air: cooling, heating, humidifying or dehumidifying and mixing.

- Investigation of the control behaviour of an automatic central air conditioning controller.

- The assembly of air duct system.

- The assembly of water duct system.

- The utilization of teaching the subjects: Central air conditioning, the measurement in thermal refrigeration.

Specifications

Fan

- Power consumption: 1.100W

- Max. flow rate: 1680 m3/h

- Max. differential pressure: 1000Pa

- Speed: 0÷2800rpm

Pipes

- Air duct: length: 16000mm. Diameter: 8x DN 200, 8x DN 100.

- Gas duct: length: 4000mm

- Water duct: length: 3000mm

References

1. William C.Whitman and William M.Johnson, Refrigeration and Air Conditioning Technology, Sixth edition, 2009.

2. Shan K. Wang, Handbook of Air Conditioning and Refrigeration, Second edition, 2001.

3. G.F. Hundy and A.R. Trott, Refrigeration and Air Conditioning, Fourth edition.

4. John H.Lienhard IV, A heat transfer textbook, Third edition, 2005.

5. Gunt, Process Control Engineering Handbook.