Download PDF by Robert McDowall: Fundamentals of HVAC Systems

By Robert McDowall

ISBN-10: 012372497X

ISBN-13: 9780123724977

The publication explains: . The ambitions to be completed through a process when it comes to environmental keep an eye on. . the outline of a approach - together with fundamental apparatus, technique of distribution, house and cargo choice, and working method. . the fundamental functionality of parts that shape HVAC platforms. . The structure and functioning of universal HVAC platforms, together with all-air structures, air-water platforms, and all-water platforms. . The thoughts for working structures and their uncomplicated technique of keep an eye on. . selecting the main appropriate kind of process for various kinds of program

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For example, a new prestigious hotel in Hawaii had to be closed within a year of opening, due to mold in over 400 bedrooms. Remedial costs will exceed $US10 million. One source of mold, that is often neglected, is the drain pan beneath a cooling coil. The coil collects moisture and, being wet, some dirt out of the air. Ideally, this moisture and dirt drips down into the tray and drains away. Unfortunately, (and frequently), if the tray has a slope-to-drain ratio that is less than the required 1/8 inch per foot, a layer of sludge can form in the tray and grow mold.

Once the relative importances have been assigned, it is time to assess the systems under consideration. In our example, both systems have excellent cooling capacity. They each score “10” under performance for this factor. When we consider the requirement for zone occupancy-timing, however, we note that the reheat system does not have any ability to shut off one part of the system and leave another running. Therefore, it scores only “1” for this requirement. The VAV system, on the other hand, has the capacity to shut off any zone at any time though the main fan still has to run, even if only one zone is on.

Therefore, the designer has to consider the clients’ requirements both for construction and for in-use costs. For example, the available construction finances may dictate a very simple system. Alternatively, the client may wish to finance a very sophisticated, and more expensive system to achieve superior performance, or to reduce in-use costs. In addition to cost structures, the availability of maintenance staff must be considered. A building at a very remote site should have simple, reliable systems, unless very competent and well-supported maintenance staff will be available.

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Fundamentals of HVAC Systems by Robert McDowall


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