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

By W. P. Jones

ISBN-10: 0080498949

ISBN-13: 9780080498942

ISBN-10: 0750650745

ISBN-13: 9780750650748

Designed for college kids engineers, the 5th variation of this vintage textual content bargains with primary technology and layout ideas of air con engineering structures. W P Jones is an stated professional within the box, and he makes use of his event as a lecturer to give the cloth in a logical and obtainable demeanour, constantly introducing new options with using labored examples. This new version has been totally up to date take into consideration the newest advancements in criteria, laws and expertise. The publication comprises contemporary examine on construction power administration platforms and the newest refrigerants. each one bankruptcy includes many examples, workouts and extra interpreting permitting the reader to extend their wisdom via extra examine. ?·Keep up to date with the newest criteria and technology?·Put conception into perform with examples and routines plus info for extra reading?·New variation contains contemporary learn on development strength administration platforms and the most recent refrigerants

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NBS Circular 564 (1955): Tables of thermal properties of air, November. , 32. J, (1962): Thermal Environmental Engineering, Prentice-Hall, New York, p. 175 Bibliography l. A. Goff and S. Gratch, Thermodynamic properties of moist air, Trans. ASHVE, 1945, 51, 125. 2. H. McAdams, Heat Transmission, McGraw-Hill, 1942. 3. G. Kern, Process Heat Transfer, McGraw-Hill, 1950. 4. H. K. H. R. Gilliland, Principles of Chemical Engineering, McGraw-Hill, 1937. 5. W. Goodman, Air Conditioning Analysis with Psychrometric Charts and Tables.

B) Pressure-volume diagram showing evaporation and superheating. 16 Fundamental properties o f air and water vapour mixtures is in the superheated state. 5(b) rather than by the point B. 10 Moisture content and humidity ratio Moisture content is defined as the mass of water vapour in kilograms which is associated with one kilogram of dry air in an air-water vapour mixture. It is sometimes called specifiC humidity or humidity ratio. Starting with the definition, we can w r i t e ~ moisture content = mass of water vapour per unit mass of dry air = ms/ma By using Dalton's law we can now apply the general gas law to each of the two constituents of moist air, just as though the other did not exist: p V = m R T in general hence psVs = msRsTs for the water vapour and paVa = maRaTa for the dry air The general gas law may be rearranged so that mass is expressed in terms of the other variables: m- pV RT By transposition in the equations referring to water vapour and dry air, we can obtain an expression for moisture content based on its definition: moisture content = PsVsgaTa RsTsPaVa = RaPs RsPa since the water vapour and the dry air have the same temperature and volume.

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.

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

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