By W. P. Jones
Designed for college students engineers, the 5th variation of this vintage textual content offers with basic technology and layout ideas of air-con engineering platforms. W P Jones is an stated professional within the box, and he makes use of his event as a lecturer to provide the cloth in a logical and obtainable demeanour, consistently introducing new recommendations with using labored examples. This re-creation has been absolutely up to date take into consideration the most recent advancements in criteria, laws and expertise. The booklet comprises fresh learn on construction power administration structures and the most recent refrigerants. every one bankruptcy comprises many examples, workouts and extra studying allowing the reader to extend their wisdom via extra examine. ?·Keep updated with the most recent criteria and technology?·Put conception into perform with examples and routines plus details for extra reading?·New variation comprises contemporary study on development strength administration platforms and the most recent refrigerants
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Additional info for Air Conditioning Engineering, Fifth Edition
_ 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.
14 Specific volume This is the volume in cubic metres of one kilogram of dry air mixed with g kilograms of water vapour. In the mixture each constituent occupies the same volume and is at the same temperature, but each exerts its own partial pressure. By Dalton's law the sum of these partial pressures is the total (barometric) pressure of the mixture. 4. 17) This equation could be used to refer to the dry air, or to the water vapour, independently if Dalton's law is accepted. In doing so, the appropriate values for the mass, particular gas constant and partial pressure of the constituent considered must be used.
It is to be noted that, when steam is mixed with dry air but the steam is not saturated, it / B' / / B At" Tc Absolute temperature (a) Pc Pb Pa Tc Wet zon Tb T~ Volume (b) Va= Vb---Vc ~ Fig. 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.
Air Conditioning Engineering, Fifth Edition by W. P. Jones