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

By W. P. Jones

Designed for college kids engineers, the 5th variation of this vintage textual content offers with basic technological know-how and layout rules of air-con engineering structures. W P Jones is an said professional within the box, and he makes use of his adventure as a lecturer to offer the cloth in a logical and available demeanour, continuously introducing new ideas with using labored examples. This re-creation has been absolutely up-to-date take into consideration the newest advancements in criteria, laws and expertise. The e-book comprises fresh examine on construction power administration structures and the most recent refrigerants. every one bankruptcy includes many examples, workouts and additional examining permitting the reader to extend their wisdom via extra learn. ?·Keep updated with the newest criteria and technology?·Put concept into perform with examples and routines plus info for extra reading?·New version contains contemporary study on development strength administration platforms and the newest refrigerants

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Example text

5 (a) Saturation vapour pressure and temperature. Charles' law applies for the superheated vapour from B to C. (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.

325 kPa and (b) a barometric pressure of 95 kPa. 015 69 kg per kg dry air at 95 kPa. 12 Relative humidity 19 Relative humidity This is defined as the ratio of the partial pressure of the water vapour in moist air at a given temperature, t, to the partial pressure of saturated water vapour in air at the same temperature, t. 7 which shows the pressure-volume changes for steam alone. 0 l_ u D_ Pw ~ T Volume Fig. 7 Relative humidity is the ratio pa/Pb for a constant absolute temperature T, shown on a pressure-volume diagram for steam.

You may use the CIBSE tables of psychrometric data only to determine saturation vapour pressures. 1%. Notation Symbol Description Unit A surface area of a water droplet second virial coefficient, molecules considered t w o at a time third virial coefficient, molecules considered three at a time second virial coefficient of dry air second virial coefficient of water vapour third virial coefficient of water vapour interaction coefficient constants constants constant specific heat of moist air specific heat of dry air specific heat of water vapour (steam) dimensionless coefficient moisture content moisture content of saturated air moisture content of saturated air at a temperature t' enthalpy specific enthalpy of moist air me Aik(T) Aijk(T) Aaa Aww AWWW Aaw A,B,C,D A', B', etc.

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