By W. P. Jones
Designed for college students engineers, the 5th version of this vintage textual content offers with primary technology and layout ideas of air-con engineering structures. W P Jones is an said specialist within the box, and he makes use of his event as a lecturer to give the fabric in a logical and available demeanour, constantly introducing new strategies with using labored examples. This re-creation has been totally up to date take into consideration the most recent advancements in criteria, laws and know-how. The booklet contains fresh examine on development strength administration structures and the most recent refrigerants. every one bankruptcy comprises many examples, routines and extra examining allowing the reader to extend their wisdom via extra study. ?·Keep updated with the newest criteria and technology?·Put thought into perform with examples and workouts plus details for additional reading?·New version contains fresh examine on development strength administration structures and the most recent refrigerants
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Extra resources for Air Conditioning Engineering, Fifth Edition
325 kPa Absolute 90 80 70 tl:i D.. _ 13.. t-. Q < 40 30 20 . 6132 kPa "--" -20 ~ --" 0o 20 ~ , , 40 ~ 60 ~ 80 ~ Temperature Fig. 10 The triple point of water. 100 ~ 34 Fundamental properties of air and water vapour mixtures and vapour, as changes of pressure and temperature occur. 2 Pa is defined by international agreement as the temperature at which the solid, liquid and vapour forms of water can exist together in saturated equilibrium. 15 K), respectively. We see in the figure that it is not possible for liquid water to exist at a pressure below that of the triple point.
The chamber contains a large wetted surface, and water is evaporated from the surface to the stream of moist air flowing over it, provided the moist air is not already saturated. Feed-water is supplied to the chamber to make good that evaporated. 8 shows such a situation. , temperature hw enthalpy Fig. 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.
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. (b) Using the data below, calculate the moisture content of air at 17~ dry-bulb and 40 per cent saturation where the barometric pressure is 95 kPa.