Download e-book for iPad: 2012 ASHRAE Handbook - Heating, Ventilating, and by ASHRAE


ISBN-10: 1621980367

ISBN-13: 9781621980360

ISBN-10: 193650426X

ISBN-13: 9781936504268

This instruction manual discusses numerous structures and the apparatus (components or assemblies) they contain, and describes positive factors and adjustments. this data is helping process designers and operators in deciding on and utilizing apparatus. This variation contains a new bankruptcy 18, Variable-Refrigerant-Flow structures, which describes those platforms, their parts, and appropriate criteria intimately, and contains a approach layout instance and demanding tips on bills, controls, and defense. This guide is a reference for engineers operating in HVAC&R and for execs in allied fields. ASHRAE, based in 1894, is a world association of a few 50,000 individuals. ASHRAE fulfills its project 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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Additional info for 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (SI Edition)

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8 2012 ASHRAE Handbook—HVAC Systems and Equipment (SI) all sides (including overhead) for extended operation, maintenance, annual inspections of tubes, and tube replacement and repair. Where appropriate, the designer should include overhead structural elements to allow safe rigging of equipment. Ideally, large central facilities should include overhead cranes or gantries. It is critical that local codes and ASHRAE Standard 15 are consulted for special equipment room requirements. Many jurisdictions require monitoring, alarms, evacuation procedures, separating refrigeration and fuel-fired equipment, and high rates of purge ventilation.

Most energy codes require that the supply duct be insulated, which is usually good practice regardless of code requirements. Uninsulated supply ducts delivering cool air are subject to condensation formation, leading to building water damage and potential mold growth, depending on the dew-point temperature of surrounding air. • Controlling humidity in a space can affect the air quantity and become the controlling factor in selecting supply airflow rate. All-air systems provide only limited humidity control, particularly at part loads, so if humidity is critical, extra care must be taken in design.

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 (SI Edition) by ASHRAE

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