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6. 4 (iii) (iv) Dehumidification 45 absorption, compression followed by cooling. The first method forms the subject matter of this section. Cooling to a temperature below the dew point is done by passing the moist air over a cooler coil or through an air washer provided with chilled water. 4 shows on a sketch of a psychrometric chart what happens when moist air is cooled and dehumidified in this fashion. Since dehumidification is the aim, some of the spray water or some part of the cooler coil must be at a temperature less than the dew point of the air entering the equipment.

3. 325 kPa, using the ideal gas laws as necessary. (b) Explain how the value would alter if the barometric pressure only were reduced. 93 kJ kg -1. 4. 7 kPa barometric pressure. Use CIBSE tables where necessary to determine saturation vapour pressure. (b) Calculate its enthalpy. 69 kJ per kg dry air. 5. (a) Distinguish between saturation vapour pressure and the vapour pressure of moist air at an unsaturated state. (b) Illustrate relative humidity by means of a p - V diagram for steam. (c) What happens if air at an unsaturated state is cooled to a temperature below its dew point?

In sensible cooling there is a further restriction: the lowest water temperature must not be so low that moisture starts to condense on the cooler coils. If such condensation does occur, through a poor choice of chilled water temperature, then the process will no longer be one of sensible cooling since dehumidification will also be taking place. 6. 3 shows the changes of state which occur, sketched upon a psychrometric chart. The essence of both processes is that the change of state must occur along a line of constant moisture content.

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