By W. P. Jones
Designed for college kids engineers, the 5th version of this vintage textual content offers with primary technology and layout ideas of air con engineering platforms. W P Jones is an stated professional within the box, and he makes use of his adventure as a lecturer to give the fabric in a logical and obtainable demeanour, continually introducing new ideas with using labored examples. This re-creation has been absolutely up-to-date take into consideration the most recent advancements in criteria, laws and expertise. The ebook contains contemporary study on construction strength administration structures and the most recent refrigerants. every one bankruptcy includes many examples, workouts and additional analyzing permitting the reader to extend their wisdom via extra study. ?·Keep up to date with the newest criteria and technology?·Put thought into perform with examples and routines plus details for additional reading?·New variation contains fresh examine on construction power administration platforms and the most recent refrigerants
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Additional info for Air Conditioning Engineering, Fifth Edition
325 kPa barometric pressure. If the masses of dry air are 3 kg and 2 kg, respectively, calculate the moisture content, enthalpy and dry-bulb temperature of the mixture. 029 On the other hand, if the temperature were calculated by proportion, according to the masses of the dry air in the two mixing airstreams, a slightly different answer results: t= 3x60+2• 5 = 38~ This is clearly the wrong answer, both numerically and by the method of its calculation. However, the error is small, considering that the values chosen for the two mixing states spanned almost the full range of the psychrometric chart.
5 Humidification This, as its name implies, means that the moisture content of the air is increased. 7 being used for steam injection into moving airstreams. There are three methods of using water as a humidifying agent: the passage of moist air through a spray chamber containing a very large number of small water droplets; its passage over a large wetted surface; or the direct injection of water drops of aerosol size into the room being conditioned. ) Whichever method is used the psychrometric considerations are similar.
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.