JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

UNIT - I

Psychrometry: Properties of moist air. Important Psychrometry properties, Dry bulb temperature, Humidity ratio, degree of saturation, Dew point temperature and Enthalpy, Psychometric chart and ASHRAE chart.

UNIT - II

Applied Psychrometry: Psychrometric processes in air conditioning equipment, Mixing, Bypass factor, Heating and dehumidifying coils, Air washers. Cooling by dry and wet coils, Use of hygroscopic solution in air washers, Adiabatic dehumidifiers. Humidifiers, Water injection. Steam injection.

UNIT - III

Comfort Air Conditioning and Cooling Load Calculations: Sensible and Latent Heat Loads - sensible heat factor. Use of Effective and grand sensible heat factor, Relationship between ESHF, ADP and BF. Representation of All Fresh Air, Recirculated air, Bypassed Air and High Latent Heat Load systems on Psychrometric Chart

UNIT - IV

Air Conditioning Systems: Summer, winter and year round air Conditioning system, Hot and dry outdoor conditions. Hot and humid outdoor conditions. Winter air conditioning system. Year round air conditioning system.

UNIT - V

Selection of outside and inside design conditions: Thermodynamics of human body. Body regulation process against heat and cold. Comfort & Comfort chart, Effective temperature, Factors governing optimum effective temperature, Design considerations. Air conditioning control systems: Basic elements of the control system, Temperature, Humidity & Pressure controls, Refrigeration, Room thermostat.

REFERENCES:

• 1. Refrigeration & Air Conditioning / C.P. Arora / TMH
• 2. Refrigeration & Air Conditioning / Arora & Domkundwar / Dhanpat Rai & Co.
• 3. Refrigeration & Air Conditioning / R C Arora / PHI / 2012
• 4. Hand Book of Air Conditioning System Design / Carrier
• 5. Refrigeration & Air Conditioning / S.C. Jain / Chand and Co.
• 6. ASHRAE Hand Book / Volume 1& 2.