Download Air Conditioning Principles and Systems An Energy Approach by Edward G. Pita P.E. PDF

By Edward G. Pita P.E.

Utilizing not less than arithmetic, this article explores the elemental strategies of air con and their software to structures, explaining all suggestions in a transparent, useful demeanour. specializes in difficulties and examples in most cases encountered at the task.

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15(j) lowers its temperature. When the cooling continues to (e), the temperature no longer drops, but the gas begins to condense to a liquid (d). After all of the steam is condensed (c), further removal of heat will result in a temperature drop of the liquid, (b) and (a). 16, called the temperature- 31 enthalpy diagram. When heat is added to the water between 32 F and 212 F, both its enthalpy and temperature increase. However, if more heat is added at 212 F, note that although its enthalpy continues iucreasing, the temperature remains constant.

Room air = 70 F Room air = 70 F ~ a Heat(O) Heat (a) 40 F-+ ~ Refrigerator at 200 F (a) ~ .. 12 Heat can flow only from a higher to a lower temperature. (a) If I, is greater than 12 , heat flows from A to B. (b) If t, = 12 , no heat follows. Fahrenheit (F), in which the boiling point of water is 212 F and the freezing point of water is 32 F at atmospheric pressure. In the SI system of units the degree Celsius (C) is used, in which the boiling point of water is 100 C and the freezing point is 0 C at atmospheric pressure.

4 / 2 17 1 Superheated vapor region - 8 6 4 7 -. J / II 2 o. 19 Slow evaporation of liquid. Escape of some molecules through surface causes a vapor pressure. fore at a lower temperature. A slight cooling effect of the liquid has occurred as a result of the evaporation. We have all noticed this effect when alcohol is rubbed on the skin. It gradually evaporates and cools itself and the skin. The molecules escaping from the surface of a liquid create vapor. The pressure exerted by the vapor at the surface of the liquid is called the vapor pressure.

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