Q.2 An evaporative cooler is used to cool a space which has a sensible heat load of 15 kW and a latent heat load of 4.8 kW. The dry air mass flow rate of the supply air is 1.4 kg/s. The air leaves the...

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Extracted text: Q.2 An evaporative cooler is used to cool a space which has a sensible heat load of 15 kW and a latent heat load of 4.8 kW. The dry air mass flow rate of the supply air is 1.4 kg/s. The air leaves the cooler with a db-temperature of 18°C and a relative humidity of 100%. The outdoor air db-temperature is 35°C. The pressure is constant at 101.3 kPa. Determine (i) the db-temperature and relative humidity of the space, (ii) the outdoor relative humidity, and (iii) the mass flow rate of water. 100 105 110 115 120 kJ/kg(d.a) 30 95 29 90 85 F-10.0 28 F2.0 8-1.0 *+0.0 27 SENSIBLE HEAT TOTAL HEAT- Qt %3D 26 80 1.0 25 4.0 75 24 70 23 ENTHALPY dH 65 22 HUMIDITY RATIO dw 21 60 20 55 19 50 18 17 45 16 40 15 35 14 30 13 5096 12 25 11 20 40% . 10 15 9. 30% 10 8 7 20% 6 5 10% -5 3 -10 1 -10 -5 10 15 20 25 30 35 40 45 50 Dry Bulb Temperature, °C. Pressure = 101325 Pa Humidity Ratio, g/kg(d.a) %09 %04 > %08 %06,Y -1.0 -0.5 0.2.