Read e-book online Air Conditioning Principles and Systems An Energy Approach PDF

By Edward G. Pita P.E.

utilizing at least arithmetic, this ebook explores the basic techniques of air-con and their program to systems—explaining all ideas in a transparent, sensible demeanour, and concentrating on difficulties and examples quite often encountered at the activity. This ebook comprises the latest and industry-wide accredited details on load calculations, layout facts, apparatus info, and use of the web. particular bankruptcy issues conceal the scope and makes use of of air-con; actual ideas; heating quite a bit; furnaces and boilers; hydronic piping platforms and terminal devices; cooling load calculations; psychrometrics; fluid stream in piping and ducts; piping, valves, ducts, and insulation; fanatics and air distribution units; centrifugal pumps, enlargement tanks, and venting; air con structures and kit; refrigeration structures and kit; automated controls; power usage and conservation; instrumentation, checking out, and balancing; and making plans and designing the HVAC method; and sunlight heating and cooling structures. For consulting engineers, mechanical contractors, HVAC engineers, designers, venture managers, and amenities managers.

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They are commonly installed on rooftops of homes in certain regions of the country, or beside a house or mobile home. H e a t Tr a n s f e r a n d H VA C B a s i c s Air Condenser Air handler FIGURE 2-12 Most homes have split systems, which are distinguished by an outside condenser and an inside air handler connected by two refrigerant lines. (Sarah Cheney/Egg Systems) (a) Package system (b) Air Side install Air Roof top FIGURE 2-13 Packaged air conditioners can be installed (a) beside the structure or (b) on a rooftop, but must be outside of the structure they are cooling or heating.

Efficiency and lower operating costs are achieved through the use of a pump rather than a compressor and a heat exchanger to recover and supply heat to the generator. A double-effect absorption cooling system adds a second generator and condenser to increase the refrigerant flow, and, by extension, the cooling effect, for a fraction of the heat needed for a single-effect system. The primary source of heat for these systems must be either waste process heat, such as low-pressure steam or hot water, or solar thermal heat.

I remember thinking that it was not exactly like separating pebbles from sand with a screen. I held my hands out in front of me, trying to imagine the air molecules in them looking different, the hot from the cold. I looked back at that air conditioner. And then I did what came naturally to the son of a high school English teacher: I read about it. It all has to do with the spacing and speed of the molecules of air. When the excited molecules pass by a cooler surface, the temperature difference allows an exchange of energy from the warmer to the cooler medium.

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


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