2012 ASHRAE Handbook - Heating, Ventilating, and by ASHRAE PDF

By ASHRAE

ISBN-10: 1621980359

ISBN-13: 9781621980353

ISBN-10: 1936504251

ISBN-13: 9781936504251

This guide discusses a number of structures and the gear (components or assemblies) they include, and describes good points and transformations. this data is helping procedure designers and operators in choosing and utilizing gear. This version contains a new bankruptcy 18, Variable-Refrigerant-Flow platforms, which describes those structures, their parts, and appropriate criteria intimately, and features a method layout instance and critical counsel on expenses, controls, and security. This instruction manual is a reference for engineers operating in HVAC&R and for pros in allied fields. ASHRAE, based in 1894, is a world association of a few 50,000 people. ASHRAE fulfills its venture of advancing heating, air flow, air con, and refrigeration to serve humanity and advertise a sustainable global via examine, criteria writing, publishing, and carrying on with schooling.

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Extra info for 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)

Sample text

Energy recovery opportunities may be more practical. Vibration and noise control, seismic bracing, outdoor air intakes, economizers, filtration, humidification, and similar auxiliary factors may be handled more simply when equipment is centralized. Decentralized MERs Many buildings locate air-handling equipment at each floor, or at other logical subdivisions of a facility. Reasons a design engineer may consider multiple distributed air-handling unit locations include the following: Reduced size of ducts reduces space required for distribution ductwork and shafts.

For best results, the most satisfactory ratio can be set after installation is completed and actual operating conditions are ascertained. Multiple perimeter spaces on one exposure served by a central system may be heated by supplying warm air from the central system. Areas with heat gain from lights and occupants and no heat loss require cooling in winter, as well as in summer. In some systems, very little heating of return and outdoor air is required when the space is occupied. 1 for recommended outdoor air ventilation).

The outdoor air damper should be kept closed until room temperatures are reached during warm-up. Low-leakage dampers should be specified. A return air thermostat can terminate warm-up. When a central air-handling unit supplies both perimeter and interior spaces, supply air must be cool to handle interior zones. Additional control is needed to heat perimeter spaces properly. Reheating the air is the simplest solution, but is often restricted under energy codes. An acceptable solution is to vary the volume of air to the perimeter and to combine it with a terminal heating coil or a separate perimeter heating system, either baseboard, overhead air heating, or a fan-powered terminal unit with supplemental heat.

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2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) by ASHRAE


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