机械毕业设计1682制冷系统综合试验台设计（量热器及总体设计）.doc

制冷系统综合试验台设计（量热器及总体设计） 摘 要 该试验台的设计是为了研究在不同工况下各输入参数的变化对压缩机或制冷系统综合性能的影响大小；或在不同制冷剂工质下，检验制冷系统的性能，并提出针对性的改善措施，最终使系统的性能得到优化。 该试验台采用“第二制冷剂电量热器法”，其原理是制冷系统产生的冷量与电加热器产生的热量相交换，达到平衡时，通过测量电加热量而得出制冷量的一种间接实验方法。校核实验方法采用水冷冷凝器量热法。该试验台设置有数据自动采集系统，通过控制系统调节节流阀的开起度和冷凝器冷却水阀的开启度，达到在设定工况下采集记录各工况参数的目的。 本次设计的主要任务是对试验台的一个主要部件——量热器进行设计计算，并对该试验台进行总体布置。通过热力计算，得出制冷量等性能指标。再根据传热学和换热器设计等有关文献，计算出蒸发盘管的传热系数，从而得出所需蒸发盘管面积，并对其进行结构设计。同时还根据量热器设计压力，计算出量热器的壁厚，并对其进行强度校核。接下来，进行了制冷系统节流机构和附属设备的选型。 关键词：量热器，试验台，第二制冷剂，制冷系统 DESIGN OF TEST BENCH FOR REFRIGERATION SYSTEM (DESIGN AND APLACATION OF CALORMETER AND WHOLE BENCH) ABSTRACT The comprehensive experimental bench of refrigeration system was set up to investigate the impact on performance of compressor or refrigeration system with the change of input parameter on different operating mode; or to check the performance of refrigeration system and introduce the improved method to optimize the performance of the system. The experimental bench was designed following to the second refrigerant electro-calorimeter. The principle is that measuring the quantity of the electricity to get the refrigerating output when the exchange of the refrigerating output produced by the refrigeration system equaled with the heat quantity produced by the electric heater. The method of checking test is water-cooled condenser calorimeter method. This experimental bench was set up automatic date acquisition system. By means of control system to set the open level of the throttle and the condenser cooling water valve, we can collect every parameter of different work condition. The primary mission of this design is to calculate the calorimeter, which is one important part of the experimental. First, through heat calculation, we can get refrigerating output, then according to heat transfer and design of heat exchanger, we can get the coefficient of heat transmission. So we get the area of coil pipe and make design of it. Also, according to the design pressure, I calculate the wall thickness of th