By ASHRAE
ISBN-10: 1621980359
ISBN-13: 9781621980353
ISBN-10: 1936504251
ISBN-13: 9781936504251
This instruction manual discusses quite a few platforms and the gear (components or assemblies) they include, and describes gains and ameliorations. this knowledge is helping method designers and operators in picking out and utilizing apparatus. This version incorporates a new bankruptcy 18, Variable-Refrigerant-Flow structures, which describes those platforms, their elements, and acceptable criteria intimately, and contains a procedure layout instance and critical suggestions on expenses, controls, and security. This instruction manual is a reference for engineers operating in HVAC&R and for execs in allied fields. ASHRAE, based in 1894, is a global 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.
Read or Download 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) PDF
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Additional resources for 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)
Sample text
The main electrical transformer and switchgear rooms should be located as close to the incoming electrical service as practical. The main electric transformers and switchgear for the plant and the mechanical equipment switchgear panels should be in separate rooms that only authorized electricians can enter. If there is an emergency generator, it should be located considering (1) proximity to emergency electrical loads, (2) sources of combustion and cooling air, (3) fuel sources, (4) ease of properly venting exhaust gases outside, and (5) provisions for noise control.
Examples of connection strategies less costly than full renovation of a connected facility are (1) return recirculation control, to maintain a design temperature across a facility connection, or (2) separation of primary distribution supply from the secondary facility connection by a plate-and-frame heat exchanger with a control valve on the primary return controlled by the secondary supply to the facility. If the temperature split is allowed to fall, increased flow of the medium through the distribution system will be required to accomplish the same capacity.
In this instance, a preheat coil installed in the minimum outdoor airstream to warm outdoor air can produce overheating, unless it is sized so that it does not heat the air above 35 to 40°F. Assuming good mixing, a preheat coil in the mixed airstream prevents this problem. 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.
2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition) by ASHRAE
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