compressor is the core of chiller . Its performance directly affects the performance of the entire unit. Similarly, the evaporator and condenser inside the chiller will also affect the performance of the compressor. , such as changes in evaporation temperature, condensation temperature, superheat, and subcooling.
So what factors in the evaporator and condenser will affect the chiller?
The editor of Kaidley screw chiller below will introduce you to the relevant knowledge about the two devices:
1. The form of the homogenizer and the inner end cover: the homogenizer can maximize the evaporator inlet according to its structure. The refrigerant is evenly distributed between the heat exchange tubes to alleviate the gas-liquid separation phenomenon. Of course, the inner end cover profile lines that it switches to different degrees should be as smooth as possible to reduce resistance and avoid gas-liquid separation, so that the refrigerant can be evenly distributed in the heat exchange tubes in the next step of the process.
2. Heat exchange tubes: will also distribute the number of different heat exchange tubes reasonably or not, so that the influence of the length of the heat exchange tubes is relatively large. It optimizes the distribution ratio of the number of heat exchange tubes between different processes, so that it can achieve a good proportional heat exchange effect. It can also function as a relatively tall corrugated inner fin tube, which can not only enhance the heat exchange on the fluorine side, but also enhance the heat exchange on the water side.
3, Water leakage between the baffle and the shell : Although compared with the fluorine side heat exchange, the heat transfer coefficient of the adjacent water side is also larger. If it is also the water leakage phenomenon between the baffle and the shell. , in serious cases it will affect the heat exchange function on the water side. In order to reduce the adverse effects of water infiltration, in addition to taking measures on the baffle structure, we can also optimize the water speed on the shell side to obtain a more reasonable water speed, such as 1.2~2.0m/s.
4. Mass flow rate in the tube: From the relationship between evaporation and heat transfer in the tube, it can be found that the flow rate in the tube is obviously affected by the mass flow rate of the refrigerant in the tube, and will also change along the length of the evaporation heat exchange tube. At the speed of the mass of the refrigerant It will also gradually decrease.
We can clearly know that the coefficient of heat release in the evaporation of these refrigerants will slowly decrease in the length direction of the heat exchange tube. In the following process, the heat release coefficient is much lower than that of the previous process. In order to use different ranges of refrigerants To calculate and optimize the flow rate, we need to make the refrigerant flow rate with a higher evaporation heat transfer coefficient within a reasonable range.
5. Supercooler: uses a subcooler in the condenser to effectively increase the subcooling degree of the refrigerant. Its cooling degree can be as high as 7-8℃, which can effectively reduce the liquid supply temperature of the evaporator, thus increasing the cold water The cooling capacity of the machine.
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This article is compiled from real cases and technical information. The pictures are from real shooting and network compilation , . If the content of the article is incorrect or there are other problems, please contact the editor as soon as possible to solve it.
