建筑环境及能源应用工程专业英语12.ppt

* Good good study,day day up! * The Air-Conditioning and Refrigeration Institute (ARI) defines a unitary air conditioner as one or more factory-made assemblies that normally include an evaporator or cooling coil and a compressor and condenser combination. It may include a heating function as well. A unitary air conditioner having more than one factory-made assembly (e.g., indoor and outdoor units) is commonly called a split system. Unitary air conditioner: 单元式空调器 Split unit: 分体式空调器 * Good good study,day day up! * Topic Three: Configuration and typical variants of unitary system-Classification 1 The remote air conditioning unit system. The unit is a factory-assembled combination of equipment which will perform all seven air conditioning functions. They are separated from compress chillers and heat source. The cooling coil may be either of the direct-expansion or chilled water type, and the heating coil may be either for hot water or for steam. 2 The self-contained air conditioning unit system. This type of unit incorporates the refrigeration condensing unit and the heating plant (frequently a gas-fired furnace) all in the same enclosure. 3 The unitary system for multi-room buildings. These systems are actually combination unitary-central-station systems. 分离式空气处理单元系统 独立式单元空调系统 多房间建筑中的单元空调系统 * Good good study,day day up! * Topic Three: Configuration and typical variants of unitary system-Classification 1 The fan-coil unit system. Unit conditioners of this type provide complete air conditioning using chilled water for cooling and hot water for heating. The same coil is ordinarily used for both summer and winter operation. The fan is a centrifugal type and blows freely into the room discharging conditioned air upward and slightly outward into the room. Slow fan and low static pressure permit extremely low noise level and power requirements. * Good good study,day day up! * Topic Three: Configuration and typical variants of unitary system-Classification 2 The duct-typ