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

By Edward G. Pita P.E.

Utilizing no less than arithmetic, this article explores the basic options of air con and their program to platforms, explaining all suggestions in a transparent, sensible demeanour. makes a speciality of difficulties and examples commonly encountered at the task.

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ENTRY LEVEL ASSISTANT TO ESTIMATOR BUT CAPABLE PERSON FOR FAST-TRACK PROMOTION TO PROJECT MANAGER. WILL START SPECIFYING TAKEOFF AND EQUIPMENT NEEDS FOR DUCTWORK, READ BLUEPRINTS, CALL MANUFACTURERS. GOOD WRITING AND COMMUNICATION SKILLS. ARE LOOKING TO PROMOTE TO PROJECT MANAGER ASAP. K. c H A p T E R Physical Principles he HVAC practitioner often encounters problems that cannot be solved without a knowledge of applied physics. In this chapter, the physical principles that are useful in understanding air conditioning will be explained.

Water can exist at its boiling/condensing temperature and pressure only on this line. To the left of the line it can exist only as a liquid and to the right only as a vapor. Along the line it can exist either as liquid, vapor, or as mixture of the liquid-vapor. 18 Will water exist in the liquid state, or as steam, if its temperature is 225 F and its pressure is 25 psia? 9 psia. (a) Initial condition (subcooled liquid). (b) Heat added, temperature increases (subcooled liquid). (c) Heat added, temperature increases (subcooled liquid).

The insulation is to be ordered in square feet (ft2). How much insulation would you order for each panel? Solution The area of the insulation for each panel is Area = 28 in. X 33 in. " The area is not in the units needed, however. 2). 42 ft 2 144~ This is the amountef insulation required for each panel, expressed in ft2. An important point to note in this example is that there are always two possible raiios that can be used in converting units. In that case, it was either 1 ft2 or 144 in. 2 144 in?

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