AIRCRAFT ENVIRONMENT CONTROL SYSTEM [AE _]

Course objectives:
The aircraft environmental control is vital to modern aircraft because of increasingly comfort level for commercial airliners and intensively avionics cooling for military aircraft. This course mainly focuses on fundamentals of aircraft environmental control and aircraft control systems and components. Fundamentals of aircraft environmental control mainly include atmosphere, aviation physiology, phycrometrics and air conditioning processes.

1. Atmosphere and Aviation Physiology (6 hours)
1. Structures of atmosphere
2. Composition of atmosphere
3. Dalton’s law and ideal gas law
4. Standard atmosphere
5. Environmental design conditions
6. Anoxia
7. Decompression disorders
8. Effect performance times
2. Phycrometrics and Air Conditioning Processes (8 hours)
1. Properties of moist air (Partial pressure, saturation pressure, moist content, dry-bulb temperature, wet-bulb temperature, dew-point temperature, relative humidity)
2. American phycrometrics
3. Molliar diagram
4. Heating processes
5. Dry cooling and wet cooling processes
6. Adiabatic humidification processes
7. Dehumidification processes
8. Adiabatic mixing processes
3. Air Cycle Refrigeration Systems and Design (16 hours)
1. Scopes
2. Heat sinks
3. Carnot cycles
4. Simple air cycle refrigeration systems (ACRS)
5. Bootstrap ACRS
6. Three wheel ACRS
7. High pressure water separation ACRS
8. Regeneration ACRS
9. Closed loop ACRS
10. Reverse bootstrap ACRS
4. Vapor Cycle Refrigeration Systems and Design (10 hours)
1. Refrigerants
2. p-h diagrams
3. Ideal vapor cycle refrigeration systems (VCRS)
4. Factors affecting VCRS performances
5. Two stage VCRS
6. Cascade VCRS
7. Other variations of VCRS
8. Combinations of ACRS and VCRS
5. Refrigeration Components (12 hours)
1. Heat exchangers (principles; structures, effectiveness, design methods)
2. Turbines (principles; structures, efficiency performances, mass flow performances, design methods)
3. Compressors (principles; structures, efficiency performances, mass flow performances, design methods)
4. Fans (principles; structures, efficiency performances, similarities, design methods)
5. Air ducts
6. Air scoops.

References:

1. Bill Neese “Aircraft Environmental Systems” Endeavor Books, 1999
2. Alvin, “Fundamentals of Aircraft Environmental Control” Hayden Book Co., 1968
3. Ian Moir, Allan Seabridge, “Environmental Control Systems”, John Wiley & Sons, Ltd, 2008
4. M. Dechow, C.A.H. Nurcombe, “Aircraft Environmental Control Systems”, The Handbook of Environmental Chemistry book series (HEC, volume 4H)

Evaluation Scheme:
There will be questions covering all the chapters in the syllabus. The evaluation scheme for the question will be as indicated in the table below:

Chapter	Hours	Mark distribution*
1 & 3 (3.8-3.10)	-	16
2	-	16
3 (3.1 - 3.7)	-	16
4	-	16
5	-	16
Total	-	80

*Note: There may be minor deviation in mark distribution.