A Refrigerating System Device Of 550 Tons Cold Storage In Chengdu Area Design And Performance Analysis

With the rapid progress of science and technology,refrigeration technology has contributed significantly to people’s quality of life.The refirigeration device plays a vital role in the regular operation of the cold storage refrigeration system.With the international community’s increasing attention to energy conservation and emission reduction,developing new energy materials for cold storage refrigeration systems is essential.Still,adding waste heat recovery devices and corresponding vibration reduction measures is urgent.This topic is based on the design and planning installation of a 550-ton cold storage refrigeration system device in Chengdu.It is a medium-sized cold storage refrigeration equipment renovation project.By consulting domestic and foreign literature and combining with the actual needs of customers,the cold storage refrigeration system device is planned and installed,and studies the energy saving,emission reduction,and vibration reduction technology of the refrigeration system device of the cold storage.The main research contents are as follows:Combined with the actual meteorological conditions in the area where the cold storage is located and the customers’ essential needs,theoretical analysis shows the primary refrigeration system devices of the cold storage are selected,optimized,planned,and installed.The automatic unloading and flexible adjustment capabilities of the parallel unit control system and the top-row pipe technology are used to reduce energy consumption and costs to meet actual needs.A waste heat recovery device with a spiral heat exchanger was designed and installed at the back end of the exhaust pipe of the compressor to recover the condensing waste heat of the refrigeration system of the cold storage.The finite element software simulated the spiral heat exchanger inside the waste heat recovery device.The temperature field shows that the temperature of the cold water after heat exchange can be as high as 68℃.Based on this,the influence of different water supply pipe diameters and water supply flow rates on heat recovery is analyzed.It is determined that when the optimal water supply pipe diameter of cold water is 40 mm,and the water flow mass flow rate of water supply is 1.55 kg/s,the heat transfer effect of the spiral tube heat exchanger is the best.The corresponding waste heat recovery scheme is provided.The finite element software analyzed the structure and acoustic modal of the piping system and the pipeline’s internal gas column to reduce the piping system’s vibration in the refrigeration compressor’s operation and increase the piping’s service life.It is concluded that the secondorder natural frequency of the piping system is close to the excitation frequency of the compressor,resulting in resonance.Still,the natural frequency of the internal gas column of the pipeline is in the non-resonant zone.Based on this,the influence of different exhaust pipe lengths,return pipe lengths,and the number of supports at the bottom of the piping on the vibration of the piping system is studied.It is concluded that the straight pipe section L1 and L2 of the exhaust pipe are 90 mm and 150 mm,respectively,and the straight pipe section L3 and L4 of the return pipe are 230 mm and 140 mm,respectively.When two fixed supports are added at the bottom of the piping system,the resonance can be avoided,and the cold storage refrigeration system device has a good vibration reduction effect.Based on the above,taking the refrigeration system device and warehouse of the modified cold storage as the research object,the Emerson system is used to test the pressure and temperature at the critical position of the cold storage unit and the continuous test of the temperature of each storage.The results show that the refrigeration device of the cold storage has good operation stability,and the temperature reaches the expected effect.The power consumption of the refrigeration device was tested by the Emerson system for 24 hours in order to explore the energy loss of the refrigeration device.It was concluded that the cumulative power consumption increased with time,and the power consumption per unit of time was low.Finally,when the critical devices of the system are running well,the temperature of hot water in different periods after heat transfer is tested.The results show that the water temperature of the storage tank increases with time,approaching 65℃,and the temperature difference with the initial water is 45℃,which is close to the temperature difference between the inlet and outlet of the shell side of the simulation data(48 ℃).The hot water after heat transfer facilitates people’s production and life,which aligns with the general trend of energy saving and emission reduction.