2012 ASHRAE Handbook - Heating, Ventilating, and by ASHRAE


This guide discusses a number of platforms and the gear (components or assemblies) they contain, and describes good points and modifications. this knowledge is helping process designers and operators in identifying and utilizing apparatus. This version contains a new bankruptcy 18, Variable-Refrigerant-Flow platforms, which describes those structures, their elements, and appropriate criteria intimately, and incorporates a process layout instance and critical information on charges, controls, and safeguard. 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 challenge of advancing heating, air flow, air-con, and refrigeration to serve humanity and advertise a sustainable international via examine, 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)

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For example, central plants are frequently located at or below grade. This provides a very stable platform for vibration isolation and greatly reduces the likelihood of vibration being transmitted into the occupied structure, where it can be regenerated as noise. Also, locating the central ventilation louvers or other openings away from noise- and vibration-sensitive areas greatly reduces the potential for problems in those areas. Louvers should be installed to prevent unwanted ambient air or water from being entrained into a facility.

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. 3 location is more economical. Also, central air-handling equipment requires less maintenance than a similar total capacity of multiple small packaged units. The many terminal units used in an all-air system do, however, require periodic maintenance.

Usually, a central, fuel-fired plant is more desirable for heating large facilities. In facilities with low heating loads, electric heating is a viable option and is often economical, particularly where care has been taken to design energy-efficient systems and buildings. Air-Handling Equipment Packaged air-handling equipment is commercially available in many sizes, capacities, and configurations using any desired method of cooling, heating, humidification, filtration, etc. These systems can be suitable for small and large buildings.

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