暖通空调专业毕业设计外文翻译.doc
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暖通空调专业毕业设计外文翻译,chilled water systems were used in less than 4% of commercial buildings in the u.s. in 1995. however, because chillers are usually installed in larger buildings...
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Chilled water systems were used in less than 4% of commercial buildings in the U.S. in 1995. However, because chillers are usually installed in larger buildings, chillers cooled over 28% of the U.S. commercial building floor space that same year (DOE, 1998). Five types of chillers are commonly applied to commercial buildings: reciprocating, screw, scroll, centrifugal, and absorption. The first four utilize the vapor compression cycle to produce chilled water. They differ primarily in the type of compressor used. Absorption chillers utilize thermal energy (typically steam or combustion source) in an absorption cycle with either an ammonia-water or water-lithium bromide solution to produce chilled water.
Overall System
Figure 4.2.2 shows a simple representation of a dual chiller application with all the major auxiliary equipment. An estimated 86% of chillers are applied in multiple chiller arrangements like that shown in the figure (Bitondo and Tozzi, 1999). In chilled water systems, return water from the building is circulated through each chiller evaporator where it is cooled to an acceptable temperature (typically 4 to 7°C) (39 to 45°F). The chilled water is then distributed to water-to-air heat exchangers spread throughout the facility. In these heat exchangers, air is cooled and dehumidified by the cold water. During the process, the chilled water increases in temperature and must be returned to the chiller(s).
冷水机组
1995年，在美国，冷水机组应用在至少4％的商用建筑中。而且，由于制冷机组通常安装在较大的建筑中，在同一年里，制冷机组冷却了多于28％的商用建筑的地板空间（DOE，1998）。在商用建筑中普遍采用五种型式的制冷机：往复式、螺杆式、旋涡式、离心式和吸收式。前四种利用蒸汽压缩式循环来制得冷冻水。它们的不同主要在于使用的压缩机种类的不同。吸收式制冷机在吸收循环中利用热能（典型
Overall System
Figure 4.2.2 shows a simple representation of a dual chiller application with all the major auxiliary equipment. An estimated 86% of chillers are applied in multiple chiller arrangements like that shown in the figure (Bitondo and Tozzi, 1999). In chilled water systems, return water from the building is circulated through each chiller evaporator where it is cooled to an acceptable temperature (typically 4 to 7°C) (39 to 45°F). The chilled water is then distributed to water-to-air heat exchangers spread throughout the facility. In these heat exchangers, air is cooled and dehumidified by the cold water. During the process, the chilled water increases in temperature and must be returned to the chiller(s).
冷水机组
1995年，在美国，冷水机组应用在至少4％的商用建筑中。而且，由于制冷机组通常安装在较大的建筑中，在同一年里，制冷机组冷却了多于28％的商用建筑的地板空间（DOE，1998）。在商用建筑中普遍采用五种型式的制冷机：往复式、螺杆式、旋涡式、离心式和吸收式。前四种利用蒸汽压缩式循环来制得冷冻水。它们的不同主要在于使用的压缩机种类的不同。吸收式制冷机在吸收循环中利用热能（典型
