半封闭螺杆机组与开启之比较.doc

半封闭螺杆冷水机组与开启式螺杆冷水机组比较项 目 半封闭螺杆冷水机组 开启式螺杆冷水机组压缩机型式 1，不需专门采用轴封，不存在冷媒泄露问题2，电机采用冷媒冷却，电机运行环境好，清洁度高，寿命长，运行温度不受外界环境的影响，而且始终保持较高的运行效率3，机房无需专门的通风设备1，需要专门采用轴封，不存在冷媒泄露问题2，电机采用空气冷却，电机运行环境差，清洁度低，寿命短，运行温度受外界环境的影响，运行效率低3，机房需专门的通风设备密封型式 采用喷油密封压缩腔体，同时喷液态制冷剂以降低排气温度，提高机组效率无此装置，机组效率低节流装置 采用电子膨胀阀进行能量调节，调节精度高，机组在部分负荷下效率高采用热力膨胀阀，调节精度低，同时部分负荷效率低油路润滑 采用压差供油，无需油泵，油冷等外部连接件，系统简洁，无须进行维护采用油泵供油，需配置油泵，油冷等外部连接件，系统复杂，须每年进行维护机组设计 采用 2 台压缩机设计，由于每台压缩机采用独立回路，当一台压缩机出现故障时，另一台仍可正常工作单台压缩机独立系统，压缩机出现故障必须停机维修Semi-closed screw chiller and opened screw chiller comparisonItem Semi-closed screw chiller Opened screw chillerCompressor type1. without using special seal equipment, and there is no question of refrigerant leak 2. the motor cooled by refrigerant , operating in good environment, cleanliness, long life, besides,operating temperature without external environmental impacts, and always maintains a higher operating efficiency. 3. the engine room without special ventilation equipment.1. need for special seal equipment, and there is no question of refrigerant leak 2. the motor cooles by air,operating in poor environment, cleanliness low, short life, besides, outside environmental affacts operating temperature, and low operating efficiency. 3. the engine room required specialized ventilation equipment.Seal device type Sealed by injection compression chamber, and spray liquid refrigerant to reduce the exhaust temperature, and increase unit’s efficiency.The absence of such a device, and low efficiency.Throttle DevicesUsing electronic expansion valve for energy regulation, and the unit has high efficiency under some load.Using thermal expansion valve for energy regulation ,and the unit has low effcicency under load.Oil circuit lubricationFor using oil pressure to supply oil, the unit has no pumps, oil cooling, and other external connections,and the system is simple without maintenance.For using oil pump to suppply oil ,the unit must has configured pumps, oil cooling, and other external connections,and the system is complicated, subjected to annual maintenance.Unit Design 2 compressors by design, thanks to each compressor used independent circuit, when a compressor failure, another can still work properly.展勤浩 13818154378@Single compressor independent systems, when compressor failure must to be down for maintenance.。