Q.1// A conference room is to be air conditioned for comfort conditions of (25oC) DBT and (50% RH). The outdoor air conditions are (35oC DBT) and (28oC WBT). The sensible and latent heat are (43200 kJ/hr) and (36000 kJ/hr) respectively. The return air from the conference room is mixed with outdoor air before entering the cooling coil as shown in the Figure below. In addition, the return air from the (conference room) is mixed with cooling air (after cooling coil) see Figure below, where cooling coil by bass factor (BPF = 0.1) and (ADP =10oC). The air is reheated to (21oC DBT) before supplying to room. Note: point 6 not equal to point 1. Determine: 1 – Conditions at point 3 (DBT3, WBT3, RH3, h3). 2 – Conditions at point 4 (DBT4, WBT4, RH4, h4). 3 – Conditions at point 5 (DBT5, WBT5, RH5, h5). 4 – Conditions at point 6 (WBT6, RH6, h6). 5 – The total quantity of air supplied to conference room (kg/sec). 6 – Capacity of reheated coil (kJ/kg). 7 – Sensible heat factor SHF. 8 – Capacity of cooling coil (kJ/kg). 9 – Contact factor of cooling coil. 10 – Sketch the process on the Psychometric chart.
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Q.1// A conference room is to be air conditioned for comfort conditions of (25oC) DBT and (50% RH). The outdoor air conditions are (35oC DBT) and (28oC WBT). The sensible and latent heat are (43200 kJ/hr) and (36000 kJ/hr) respectively. The return air from the conference room is mixed with outdoor air before entering the cooling coil as shown in the Figure below. In addition, the return air from the (conference room) is mixed with cooling air (after cooling coil) see Figure below, where cooling coil by bass factor (BPF = 0.1) and (ADP =10oC). The
air is reheated to (21oC DBT) before supplying to room.
Note: point 6 not equal to point 1.
Determine:
1 – Conditions at point 3 (DBT3, WBT3, RH3, h3).
2 – Conditions at point 4 (DBT4, WBT4, RH4, h4).
3 – Conditions at point 5 (DBT5, WBT5, RH5, h5).
4 – Conditions at point 6 (WBT6, RH6, h6).
5 – The total quantity of air supplied to conference room (kg/sec). 6 – Capacity of reheated coil (kJ/kg).
7 – Sensible heat factor SHF.
8 – Capacity of cooling coil (kJ/kg).
9 – Contact factor of cooling coil.
10 – Sketch the process on the Psychometric chart.
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