By W. P. Jones
Designed for college students engineers, the 5th variation of this vintage textual content bargains with basic 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 adventure as a lecturer to provide the cloth in a logical and obtainable demeanour, consistently introducing new strategies with using labored examples. This re-creation has been totally up-to-date take into consideration the newest advancements in criteria, laws and expertise. The ebook comprises fresh learn on development power administration structures and the most recent refrigerants. every one bankruptcy includes many examples, workouts and additional analyzing allowing the reader to extend their wisdom via extra learn. ?·Keep updated with the most recent criteria and technology?·Put conception into perform with examples and workouts plus info for extra reading?·New version comprises contemporary study on development strength administration platforms and the newest refrigerants
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Additional resources for Air Conditioning Engineering, Fifth Edition
It is also known as the degree of saturation. _ ms ma Ps Pa psVs RsTs --. o , RaTa paVa Ra Rs since the steam and dry air occupy the same volume and are at the same temperature, being in intimate contact with one another. We may then write Ps g- Ra (Pat-Ps) " RS for the unsaturated moist air. 15) Pss ( P a t - Pss) . 15). 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.
The enthalpy of dry air increases very slightly as the pressure falls at constant temperature but, for most practical purposes, it can be regarded as a constant value at any given temperature from one standard atmosphere down to 80 kPa. It follows that the most significant effect of a change in barometric pressure on the enthalpy of moist air lies in the alteration of the moisture content. 15 Calculate the enthalpy of moist air at 20~ per cent saturation. 54 kJ kg -1 at 20~ saturated. 5 kPa. 61 kJ kg -1.
1. CIBSE Guide (1986): C1 Properties of humid air, and C2 Properties of water and steam. W. (1949): Standardisation of thermodynamic properties of moist air, Trans. ASHVE, 55, 125. P. (1965): Fundamental concepts and definitions relating to humidity. In Science and Industry 3:289. H. , New York. W. and Wexler, A. 15 K, ASHRAE Trans. 89(2A), 500519. P. (1970): The psychrometric chart in SI units, JIHVE, 38, 93. P. (1994): A review of CIBSE psychrometry, Building Serv. Eng. Res. Technol. 15, 4, 189-198.
Air Conditioning Engineering, Fifth Edition by W. P. Jones