Psychometric properties

1. k k y . i i t k @ g m a i l . c o m
F u n d a m e n t a l
O f
P s y c h r o m e t r i c
C h a r t
Er. Krishna Kumar Yadav
M.Tech, IIT Kanpur

2. Dry Bulb temperature line Specific Humidity line
Lines of Psychrometric chart

3. Dew point temperature line Wet bulb
Temperature line

4. Enthalpy Lines Specific Volume lines

5. Vapour Pressure line Relative Humidity

8. Psychrometric Processes

9. Sensible Heating
Heat Added

10. Sensible Cooling

11. By Pass Factor
Heating Coil
Efficiency of heating and cooling coil

12. Humidification and Dehumidification
Humidification Dehumidification

13. Cooling and Dehumidification

15. Cooling and with adiabatic humidification
• When temperature of water washer is at Tw of air entering
• Lower than Tw
• Higher than Tw

17. Evaporative Cooling (By Water spray)
Specific
humedity

18. Heating and Humidification
• This process is generally used in winters
• Air is passes from the humidifier spray having temperature greater than the dry
bulb temperature of entering air
• Unsaturated air get the moisture and become hot
• Heat of vaporization is absorbed

19. Heating and Humidification by steam Injection

21. Heating and dehumidification Adiabatic chemical Dehumidification
• This process is used for specific industrial
requirement
• Air is passes over moisture affinity chemicals

22. Adiabatic Mixing of two Air Stream