This instruction manual discusses numerous structures and the gear (components or assemblies) they contain, and describes good points and transformations. this knowledge is helping procedure designers and operators in making a choice on and utilizing apparatus. This variation incorporates a new bankruptcy 18, Variable-Refrigerant-Flow structures, which describes those platforms, their parts, and appropriate criteria intimately, and incorporates a process layout instance and significant counsel 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 people. ASHRAE fulfills its venture of advancing heating, air flow, air-con, and refrigeration to serve humanity and advertise a sustainable global via learn, 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)
To remove dissolved solids or allow maintenance when installing subtraction meters) to the storm drainage system, but note that environmental effects of the water chemistry must be evaluated. Where chemical treatment conditions do not meet environmental outfall requirements, drainage to the sanitary system may still be required unless prefiltration can be incorporated. Water pumps move both chilled and condenser water to and from the refrigeration equipment and associated ancillary equipment.
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. Additional control is needed to heat perimeter spaces properly. Reheating the air is the simplest solution, but is often restricted under energy codes.
Seismic and Wind Issues Depending on code requirements and the facility’s location with respect to seismic fault lines, seismic bracing may be required for the central plant equipment and distribution. For instance, a hospital located in a seismically active area must be able to remain open and operational to treat casualties in the aftermath of an earthquake. Additionally, outdoor equipment in some areas needs appropriate bracing for wind loads. This is particularly apparent in critical operations facilities in areas susceptible to hurricanes or tornadoes.
2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (SI Edition) by ASHRAE