In the recent 50 years, with the rapid development of m […]
In the recent 50 years, with the rapid development of modern science and technology, the technology of refrigerated cold room has been changing at a rapid pace. And it is playing an increasingly important role in the fields of modern national economy, people's life, national defense research, culture and the arts. China is one of the earliest countries to use natural cold source. With the progress of society, refrigeration system technology has been widely applied to various industries. The role of refrigeration technology is irreplaceable.
Therefore, the design of refrigeration system has become an important part. Refrigeration system design, whether it is assembled into the overall unit manufacturers, or on-site assembly system, the main choice of refrigeration compressors, condensers, evaporators, throttling institutions and fans, motors and automatic control equipment. The steps are to determine the design conditions of the refrigeration system based on the given chilled water temperature (or cooled air temperature), flow rate and inlet temperature and flow rate of the cooling water (or cooling air) Temperature and condensing temperature of the system design parameters of the intrinsic parameters), and then, in accordance with the design conditions of the refrigeration system to select the various components of the equipment, so that each device in the operation of matching each other to give full play to each device's ability to work.
However, when a refrigeration unit or a refrigeration system is actually operating, when external parameters (ie, water flow or air flow through the condenser and evaporator, and water or air inlet temperature, etc.) are changed within a certain range , How the performance of the aircraft system changes, the composition of the selected components are properly matched, are designed to consider the issue. In addition, the completion of the design, refrigeration work safety technology, the proper operation of refrigeration equipment, is our inevitable choice in the specific operation.
The volume of the receiver is calculated as the circulating capacity of the refrigerant, but the maximum storage capacity should not exceed 1/3 to 1/2 of the total circulating capacity of the refrigerant per hour. At the same time, consideration should be given to the danger that the liquid refrigerant in the liquid receiver will expand due to heat expansion when the ambient temperature changes. The storage capacity of drums should not exceed 70% ~ 80% of the total capacity.