2012 ASHRAE Handbook - Heating, Ventilating, and by ASHRAE

By ASHRAE

This guide discusses a variety of platforms and the apparatus (components or assemblies) they contain, and describes positive factors and modifications. this data is helping approach designers and operators in picking out and utilizing gear. This version features a new bankruptcy 18, Variable-Refrigerant-Flow platforms, which describes those platforms, their elements, and appropriate criteria intimately, and incorporates a method layout instance and demanding information on charges, controls, and safeguard. This instruction manual is a reference for engineers operating in HVAC&R and for pros in allied fields. ASHRAE, based in 1894, is a global association of a few 50,000 people. ASHRAE fulfills its project of advancing heating, air flow, air-con, and refrigeration to serve humanity and advertise a sustainable global via study, criteria writing, publishing, and carrying on with schooling.

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Extra resources for 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (SI Edition)

Sample text

Again, commercially available software can help the designer evaluate the overall energy effects of these decisions. Space Pressure Designers faced with the need to provide space pressure control along with temperature, humidity, and/or air filtration control will most likely find that all-air systems are the only systems capable of achieving this pressure control. Many special applications, such as isolation rooms, research labs, and cleanrooms, require constantvolume supply and exhaust air to the space to ensure space pressure control.

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. The perimeter heating should be individually controlled and integrated with the cooling control. Lowering the supply water temperature when less heat is required generally improves temperature control.

12 V ERY early in the design of a new or retrofit building project, the HVAC design engineer must analyze and ultimately select the basic systems, as discussed in Chapter 1, and whether production of primary heating and cooling should be decentralized (see Chapter 2) or central (see Chapter 3). This chapter covers the options, processes, available equipment, and challenges of all-air systems; for all-water, air-and-water, and local terminal systems, see Chapter 5. org). Building air systems can be designed to provide complete sensible and latent cooling, preheating, dehumidification, and humidification capacity in air supplied by the system.

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