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

By W. P. Jones

Designed for college kids engineers, the 5th version of this vintage textual content bargains with basic technology and layout rules of air con engineering platforms. W P Jones is an said specialist within the box, and he makes use of his event as a lecturer to offer the fabric in a logical and obtainable demeanour, continually introducing new recommendations with using labored examples. This new version has been totally up to date take into consideration the most recent advancements in criteria, laws and expertise. The publication contains fresh learn on development strength administration structures and the newest refrigerants. every one bankruptcy comprises many examples, workouts and additional analyzing permitting the reader to extend their wisdom via extra study. ?·Keep updated with the most recent criteria and technology?·Put concept into perform with examples and routines plus details for extra reading?·New variation contains fresh examine on construction strength administration structures and the most recent refrigerants

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Example text

We also see that, because the solid-liquid line is very nearly vertical, liquid water temperatures less than 0~ are only possible at very high pressures. Exercises 1. (a) Air at a condition of 30~ dry-bulb, 17~ wet-bulb and a barometric pressure of 105 kPa enters a piece of equipment where it undergoes a process of adiabatic saturation, the air leaving with a moisture content of 5 g kg -1 higher than entering. Calculate, using the data below, and the ideal gas laws, (i) (ii) the moisture content of the air entering the equipment, the dry-bulb temperature and enthalpy of the air leaving the equipment.

69 g/kg dry air. Note that although the saturation vapour pressure is independent of barometric pressure the moisture content of air at 100 per cent saturation is not. #/ to o ~ o Dry-bulb temperature Fig. 6 The effect of barometric pressure on percentage saturation. 18 Fundamental properties of air and water vapour mixtures for air at 100 per cent saturation corresponds to higher moisture contents as the barometric pressure decreases. 11 Percentage saturation This is not the same as relative humidity but is sometimes confused with it.

325 kPa and this value is used by the American Society of Heating, Refrigeration and Air Conditioning Engineers. It is also, incidentally, the value adopted by the Meteorological Office in Great Britain. It is worth noting though, that there are a few differences of expression in the British and American charts. The most important of these is, of course, in the datum used for the enthalpy of dry air. Two other minor points of difference are that the American chart expresses the temperature of adiabatic saturation and specific humidity, whereas the British chart uses wet-bulb temperature (sling) and moisture content (which is the same as specific humidity).

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