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Sample text

The wet-bulb temperature is a value indicated on an ordinary thermometer, the bulb of which has been wrapped round with a wick, moistened in water. The initial temperature of the water used to wet the wick is of comparatively minor significance, but the cleanliness of the wick and the radiant heat exchange with surrounding surfaces are both important factors that influence the temperature indicated by a wet-bulb thermometer. On the other hand, the temperature of adiabatic saturation is that obtained purely from an equation representing an adiabatic heat exchange.

336 g/kg tc Fig. 5. (a) Mark state points A and B on a psychrometric chart. Join them by a straight line and extend the line to cut the saturation curve. 25~ It is not easy to decide this value with any exactness unless a large psychrometric chart is used. However, it is sufficiently accurate for present purposes (and for most practical purposes) to take the value read from an ordinary chart. 94 kJ kg -1. 874 [3 = 5 9 . 25 ~ 48 The psychrometry of air conditioning processes Clearly, in view of the error in reading the apparatus dew point from the chart, the value of 15 obtained from the temperatures is quite accurate enough in this example and, in fact, in most other cases.

Whichever method is used the psychrometric considerations are similar. It is customary to speak of the humidifying efficiency or the effectiveness of an air washer (although neither term is universally accepted) rather than a contact or by-pass factor. There are several definitions, some based on the extent to which the dry-bulb temperature of the entering moist airstream approaches its initial wet-bulb value, and others based on the change of state undergone by the air. In view of the fact that the psychrometric chart currently in use by the Chartered Institution of Building Services Engineers is constructed with mass (moisture content) and energy (enthalpy) as oblique, linear co-ordinates, the most suitable definition to use with the chart is that couched in terms of these fundamentals.

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