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 booklet explores the elemental options of air con and their software to systems—explaining all ideas in a transparent, sensible demeanour, and concentrating on difficulties and examples regularly encountered at the task. This booklet comprises the newest and industry-wide accredited info on load calculations, layout information, gear details, and use of the net. particular bankruptcy subject matters disguise the scope and makes use of of air con; actual ideas; heating lots; furnaces and boilers; hydronic piping structures and terminal devices; cooling load calculations; psychrometrics; fluid circulation in piping and ducts; piping, valves, ducts, and insulation; lovers and air distribution units; centrifugal pumps, enlargement tanks, and venting; air-con platforms and gear; refrigeration structures and gear; automated controls; power usage and conservation; instrumentation, checking out, and balancing; and making plans and designing the HVAC procedure; and sun heating and cooling structures. For consulting engineers, mechanical contractors, HVAC engineers, designers, undertaking managers, and amenities managers.

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38 DOMESTIC GAS INSTALLATION PRACTICE Fig. 35 Marking out single set The mark is now made on the pipe at this point. It must then be placed in the former in line with the spot where the bend will begin. This spot can be found by placing a piece of pipe in the former and lining up a square with the pipe and the centre of the former, Fig. 36. Alternatively, a simple way of locating the pipe is as follows: Fig. 36 Locating pipe in the machine • place the guide on the pipe with its end in line with the marks on the tube • insert the guide and tube into the machine until the guide just touches the roller, Fig.

Bent, usually by opening out the end, Fig. 25(a) and (c). The bent section of tube is gripped between the cap and the boss of the fitting. These fittings should not be used on tubes above 28 mm size. Making compression joints The end of the pipe must be clean and not scratched or distorted. It must be squarely cut and all burrs should be removed. The cap should be tightened sufficiently to form a sound joint, but not over-tightened and the pipework should not be strained when the joint is made.

Nuts Nuts are usually square or hexagonal and they are usually made to the same dimensions as the head of the bolt on which they fit. Locknuts, Fig. 58(a), are half as thick as an ordinary nut. They are ‘locked’ by tightening against the main nut. (a) (b) (c) (d) Fig. 58 Types of nuts: (a) Locknut; (b) Slotted nut; (c) Castle nut; (d) Wing nut Slotted or castle nuts, Fig. 58(b) and (c), are used in conjunction with a drilled bolt and a split pin. When the nut is in the required position, the split pin is passed through both the hole in the bolt and the slot in the nut and then secured.

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