制冷系统培训.ppt

冷却空气的蒸发器 满液式壳管蒸发器 板式蒸发器 除垢效果评估 氨排空系统 利用那些措施可降低制冷电耗 （1）、优化系统设计，采用氨直接冷却和高效的薄板冷却器； （2）、高压系统定期放空排油； （3）、冷凝器循环水质监控； （4） 、采取除垢及杀菌灭藻措施； （5）、低压系统定期排油； （6）、根据制冷负荷调整开机台数； （7）、加强制冷系统保温。 如何降低峰时用电比例 （1）、增加冰水及冷媒储罐容积，增加平谷时冰水及 冷媒制备量，降低峰时制冷开机台数和开机时间； (2)、在谷时冷媒及蒸发器温度控制下限，峰时控制上 限； （3）、在淡季安排糖化投料时避开峰时用冷时段； （4）、啤酒速冷尽量安排在平谷时进行； * * Discuss the construction and operation of an evaporative condenser (page 30). A typical evaporative condenser cell is represented in Figure 4?19 below. Each cell consists of the following major components: refrigerant condensing coils, fan, water sump, recirculation pump, drift eliminators, and water spray nozzles. The hot ammonia gas is fed into the top of the cooling coil. Water is evenly sprayed over the cooling coil by spray nozzles. The water is supplied by the recirculation pump from the condenser water sump. The water absorbs heat from the ammonia in the coils. Water evaporates from the wet coils and heat is carried away in the water vapor by the fan-induced airflow. Any water that does not evaporate falls back to the condenser sump. The sump is supplied with makeup water to replace the evaporated water and to control the amount of solids in the circulating water. Excess water return returns back to a tank or other source to be chemically retreated. The ammonia gas is continually cooled as it flows through the coil. When enough heat has been removed, the gas condenses to liquid ammonia. The liquid ammonia flows out of the coil and drains to the receivers. Discuss glycol sub-loops (page 32). Some of cooling loads require glycol at above freezing temperatures. These cooling loads are supplied through sub-loops that mix locally recirculated glycol with cold glycol from the main system. Refer to Figure 4?22. In the above sub-loop, a recirculation pump supplies glycol at a constant 33?F to an air cooling coil by blending a portion of glycol return flow with cold glycol (27?F) from the main system. A temperature transm