This guide discusses numerous platforms and the apparatus (components or assemblies) they contain, and describes beneficial properties and alterations. this data is helping method designers and operators in opting for and utilizing gear. This version incorporates a new bankruptcy 18, Variable-Refrigerant-Flow platforms, which describes those platforms, their elements, and acceptable criteria intimately, and features a method layout instance and critical assistance on charges, controls, and protection. 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 folks. ASHRAE fulfills its challenge of advancing heating, air flow, air con, and refrigeration to serve humanity and advertise a sustainable international via study, 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)
If an energy analysis study is performed as part of the comparison between decentralized and centralized concepts, the resulting month-to-month energy data should be a good electronic document to benchmark actual energy consumption using the measurement and verification plan implementation. Ongoing commissioning or periodic recommissioning further ensures that the design intent is met, and that cooling and heating are reliably delivered after the warranty phase. Many central systems are designed and built with the intent to connect to facilities in a phased program, which also requires commissioning.
Most building codes require that measures such as anchors and bracing be applied to the HVAC system. Refer to the local authority responsible for requirements, and to Chapter 55 of the 201 1 ASHRAEHandbook-HVAC Applicationsfor design guidance. SPACE CONSIDERATIONS In the very early phases of building design, architects, owners, and space planners often ask the engineer to estimate how much building space will be needed for mechanical equipment. The type of mechanical system selected, building configuration, and other variables govern the space required, and many experienced engineers have developed rules of thumb to estimate the building space needed.
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.