Download PDF by W. P. Jones: Air Conditioning Engineering, Fifth Edition

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By W. P. Jones

ISBN-10: 0080498949

ISBN-13: 9780080498942

ISBN-10: 0750650745

ISBN-13: 9780750650748

Designed for college students engineers, the 5th variation of this vintage textual content bargains with primary technological know-how and layout ideas of air con engineering platforms. W P Jones is an said professional within the box, and he makes use of his event as a lecturer to give the fabric in a logical and available demeanour, consistently introducing new innovations with using labored examples. This new version has been totally up to date take into consideration the most recent advancements in criteria, laws and know-how. The publication comprises contemporary examine on development strength administration structures and the most recent refrigerants. each one bankruptcy includes many examples, routines and additional analyzing permitting the reader to extend their wisdom via extra examine. ?·Keep up to date with the most recent criteria and technology?·Put thought into perform with examples and routines plus info for extra reading?·New version contains fresh examine on development strength administration structures and the newest refrigerants

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Air Conditioning Engineering, Fifth Edition by W. P. Jones PDF

Designed for college students engineers, the 5th version of this vintage textual content bargains with basic technology and layout ideas of air-con engineering structures. W P Jones is an stated specialist within the box, and he makes use of his adventure as a lecturer to provide the cloth in a logical and available demeanour, continuously introducing new concepts with using labored examples.

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8 Airflow through a perfectly insulated humidification chamber. A heat balance may be established: Ca(t1 - t2) + Csgl(tl - t2) = (g2 - gl)[(t2 - tw) + hfg] This equation expresses the physical changes that have taken place: (i) g 2 - gl kg of feed-water are sensibly heated from a temperature of tw to a temperature t2. (ii) g2 - g l kg of water are evaporated from the wetted surface within the chamber, at a temperature t 2. The latent heat required for this is hfg kJ kg -1 at temperature t2. (iii) 1 kg of dry air is cooled from a temperature tl to a temperature t2.

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.

1 shows a state point on a psychrometric chart. @•, % % / ,,U o \ ~ ~ A Dewpoint Specific volume / \\~ / (State Moisture content Drybulb Fig. 1 The variables shown on the psychrometric chart. 2 shows what happens when two airstreams meet and mix adiabatically. Moist air at state 1 mixes with moist air at state 2, forming a mixture at state 3. , o. E h2 g3 g2 Dry-bulb temperature Fig. 2 The adiabatic mixing of two airstreams. Therefore gl - g3 g3 - g2 maz mal Similarly, making use of the principle of the conservation of energy, hi - h3 h3 - h2 ma2 mal From this it follows that the three state points must lie on a straight line in a massenergy co-ordinate system.

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Air Conditioning Engineering, Fifth Edition by W. P. Jones

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