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

By Edward G. Pita P.E.

utilizing at least arithmetic, this publication explores the basic suggestions of air con and their software to systems—explaining all innovations in a transparent, functional demeanour, and concentrating on difficulties and examples as a rule encountered at the activity. This e-book comprises the newest and industry-wide authorised details on load calculations, layout info, gear details, and use of the web. particular bankruptcy subject matters hide the scope and makes use of of air-con; actual rules; heating a lot; furnaces and boilers; hydronic piping structures and terminal devices; cooling load calculations; psychrometrics; fluid circulate in piping and ducts; piping, valves, ducts, and insulation; lovers and air distribution units; centrifugal pumps, enlargement tanks, and venting; air con structures and gear; refrigeration structures and kit; computerized controls; power usage and conservation; instrumentation, trying 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, undertaking managers, and amenities managers.

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Appraisal of results of survey Assess results of upgrading fabric – walls, roofs, floors and windows. Assess cost and energy savings, and other benefits such as improved comfort. Windows – assess condition of window frames and need for upgrading – this will factor into the case for double glazing. Assess opportunities for changing window size. Assesss effect of blinds or shading on cooling load. Doors – assess opportunities for reducing heat losses – revolving doors, air curtains, closers. Energy – assess effects of switching fuels, suppliers.

Submeters may not be linked to billing, but identifying the consumption related to individual buildings is important. Even if a meter is not used for billing, regular readings, taken manually if necessary, should be incorporated as part of the monitoring strategy. Electricity bills will also show maximum demand charges (see Chapter 8), and further analysis should reveal whether loadshifting is feasible as a means of reducing these charges. A series of bills going back a number of years will also enable long-term trends in energy usage to be revealed.

4) and this may dictate the extent of possible changes. 4 Lifetimes of different elements of a building Element Lifetime (years) Structure 50 + Building services 20 Cabling 12 Office equipment 6–8 IT hardware 3–5 CHAPTER 4 TECHNIQUES FOR REDUCING ENERGY CONSUMPTION The general strategy for reducing energy consumption should be: ● ● ● ● Repair faults Reduce loads where possible Use efficient plant to service the loads Use efficient sources of energy to operate the plant. Once the sources of energy waste have been identified through the energy audit, techniques for reducing this waste must be found.

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


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