Refrigeration and Air conditioning Suction Air conditioning processes

Refrigeration and Air conditioning Suction Air conditioning processes Preparation MR. Sayed Ahmed Nezar

Learning out come: 1. Identify air conditioning process 2. Determine air properties.

4 8 H hu ea m tin id g ifi an ca d tio n 1 d n n a tio g a il n ific oo mid C u h e d 5 Dehumidification 3 Sensible cooling Humidification 9 Co hu oli mi ng dif an ica d tio n 6 Sensible heating 2 de Heat hu ing mi dif and ica tio n 7

1 -Sensible heating 1 2 W 1 = W 2 DBT 1 DBT 2 In sensible heating, the air temperature increases but there is no change in moisture content. This effect is a straight horizontal Iine goes from the left to the right on chart.

2 -Sensible cooling 2 1 W 1 = W 2 DBT 1 In sensible heating, the air temperature decreases but there is no change in moisture content. This effect is a straight. horizontal Iine goes from the right to the left on chart

3 -Humidification 2 1 W 2 W 1 DBT 2 = DBT 1 Introducing steam having the same temperature to the air can do humidification at constant dry bulb temperature. This process as a vertical up ward line on chart

4 -Dehumidification W 1 1 2 W 2 DBT 2 = DBT 1 Using chemical material to dry the air can do dehumidification at constant dry bulb temperature. This process as a vertical down ward line on the chart.

5 -Cooling and dehumidification W 1 1 2 W 2 DBT 1 This process is a combination of sensible cooling and dehumidification.

6 -Heating and humidification 2 W 1 1 DBT 2 This process is a combination of sensible heating and humidification.

7 -Cooling and humidification (Adiabatic saturation) W 2 2 1 DBT 2 W 1 DBT 1 This process called direct evaporative cooling and it follows the constant enthalpy line (wet bulb line), the dry bulb temperature of air decreases as the air is saturated.

8 -Heating and Dehumidification W 1 1 2 DBT 1 DBT 2 This process is a combination of sensible heating and dehumidification. W 2

Air conditioning processes How many air conditioning Processes?

4 8 H hu ea m tin id g ifi an ca d tio n 1 d n n a tio g a il n ific oo mid C u h e d 5 Dehumidification 3 Sensible cooling Humidification 9 Co hu oli mi ng dif an ica d tio n 6 Sensible heating 2 de Heat hu ing mi dif and ica tio n 7

PSYCHROMETRIC EXERCISES

- Exercise no 1: - 30 0. 889 66 RH SV h WBT 22 DPT 16 W 0. 0105 35 DBT °C WBT °C h kj /kg R H % Wkgw / kga SV m³/kg DPT °C 35 22 66 30 0. 0105 0. 889 16

- Exercise no 2: - h SV 91 0. 913 40 RH 28 WBT 24. 5 W DPT 0. 0185 DBT 40 DBT °C WBT °C h kj /kg R H % Wkgw / kga SV m³/kg DPT °C 40 28 91 40 0. 0185 0. 913 24. 5

- Exercise no 3: - RH SV h 60 0. 882 73 WBT DPT 24 21. 8 W 0. 0165 30 DBT °C WBT °C h kj /kg R H % Wkgw / kga SV m³/kg DPT °C 30 24 91 60 0. 0165 0. 882 21. 8

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