Download e-book for iPad: Air Conditioning Engineering by W.P. Jones MSc CEng FInstE FCIBSE MASHRAE


ISBN-10: 0750650745

ISBN-13: 9780750650748

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61 kJ kg -1. 8693 m 3 kg -1. 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.

Ultrasonic acoustic humidifiers are also used to atomise water. A piezo-electric crystal submerged in water converts a high frequency electronic signal into oscillations which drive particles of water from the surface into the airstream. 8. As with all humidifiers that inject droplets into an airstream demineralised water must be used. Otherwise the salts of hardness and other pollutants remain in the humidified airstream as airborne solids after the droplets have evaporated and are delivered to the conditioned space.

It is customary and convenient to design charts at a constant barometric pressure because barometric pressure does not alter greatly over much of the inhabited surface of the earth. When the barometric pressure is significantly different from the standard adopted for the chart or psychrometric tables to hand, then the required properties can be calculated using the equations derived earlier. The British standard is that adopted by the Chartered Institution of Building Services Engineers for their Tables of Psychrometric Data and for their psychrometric chart.

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Air Conditioning Engineering by W.P. Jones MSc CEng FInstE FCIBSE MASHRAE

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