Different from the traditional hydraulic oil cooling method,a new type of constant temperature oil tank cooling system based on semiconductor refrigeration technology is designed. This paper studies the principle of s...Different from the traditional hydraulic oil cooling method,a new type of constant temperature oil tank cooling system based on semiconductor refrigeration technology is designed. This paper studies the principle of semiconductor refrigeration and establishes a heat transfer model. Semiconductor cooler on piping refrigeration is simulated,and influence of the parameters on the outlet temperature,such as pipe pressure difference of inlet and outlet,pipe length,pipe radius,are gotten,and then hydraulic tank semiconductor refrigeration system is proposed. The semiconductor refrigeration system can control temperature at 37 ± 1°C.展开更多
This paper analyzes the status and the development trend of refrigerator fresh-keeping technologies domestically and internationally, introduces several popular fresh-keeping technologies, elaborates on the principles...This paper analyzes the status and the development trend of refrigerator fresh-keeping technologies domestically and internationally, introduces several popular fresh-keeping technologies, elaborates on the principles and characteristics of several fresh-keeping technologies, and put forth that the future research should be focused on the different needs of customers.展开更多
An adsorption refrigeration system can be driven by low grade heat and uses natural refrigerant with the advantage of reducing the greenhouse gases emission.However,one of the weaknesses is its low efficiency and more...An adsorption refrigeration system can be driven by low grade heat and uses natural refrigerant with the advantage of reducing the greenhouse gases emission.However,one of the weaknesses is its low efficiency and more importantly its high cost.The recovery of internal waste heat becomes therefore very important in order to improve the coefficient of performance(COP).Analysis based on pinch technology can be helpful to optimal heat recovery operation.In this paper,temperature-heat diagrams and problem tables for adsorption refrigeration systems are proposed and analyzed using Pinch Technology.The results show that pinch point is located between beds and the main waste heat needs to be recovered between beds.Dynamic characteristic(time factor)of adsorption refrigeration system is the main resistance for heat recovery.The effect of pinch point temperature difference on the system COP is not distinct.Furthermore,when the driving temperature is 90°C,the COP of adsorption refrigeration via optimization of pinch analysis is 0.73 which is fairly comparable to Li Br-water absorption refrigeration system.Pinch Technology can be adopted in different types of adsorption refrigeration systems(two-bed,four-bed,mass recovery,et al.).展开更多
Refrigerants used in refrigerators are an important source of ozone depleting substances released into the atmosphere, and can have a significantly negative effect on the hole in the ozone layer. But most emission of ...Refrigerants used in refrigerators are an important source of ozone depleting substances released into the atmosphere, and can have a significantly negative effect on the hole in the ozone layer. But most emission of refrigerants is man-made, unrea-sonable and needless. Since in most emission cases the refrigerants are contained in the refrigerators, we can retrieve them by some technique that changes the 'manual emission' into manual retriev-ing. To promote the retrieval action and diminish the pollution, society can use economic, administrative and technical counter-measures, which can create a 'good-cycle' both 'harnessing pollu-tion and earning income simultaneously', reinforce the motive of retrieving, and retrieve most proportion of refrigerants used by all refrigerators. This 'good-cycle' method can be easily promoted, and also a valuable way to promote other forms of environmental protection. The three countermeasures have almost no social cost, even no cost at all.展开更多
Cryogenic electronics refers to the devices and circuits operated at cryogenic temperatures(below 123.15 K),which are made from a variety of materials such as insulators,conductors,semiconductors,superconductors and t...Cryogenic electronics refers to the devices and circuits operated at cryogenic temperatures(below 123.15 K),which are made from a variety of materials such as insulators,conductors,semiconductors,superconductors and topological materials.The cryogenic electronics are endowed with some unique advantages that cannot be realized in room temperature,including high computing speed,high power performance and so on.Choosing the appropriate refrigeration tech-nology is critical for achieving the best performance of the cryogenic electronics.In this review,the cryogenic technology was divided into non-optical refrigeration and optical refrigeration,where non-optical refrigeration technologies are relatively conventional refrigeration technologies,while optical refrigeration is an emerging research field for the cooling of the chips.In the current work,the fundamental principles,applications and development prospects of the non-optical refrigeration was introduced,also the research history,fundamental principles,existing problems and application prospects of the optical refrigeration was thoroughly reviewed.展开更多
基金Supported by the National Natural Science Foundation of China(No.51175448,51405424)
文摘Different from the traditional hydraulic oil cooling method,a new type of constant temperature oil tank cooling system based on semiconductor refrigeration technology is designed. This paper studies the principle of semiconductor refrigeration and establishes a heat transfer model. Semiconductor cooler on piping refrigeration is simulated,and influence of the parameters on the outlet temperature,such as pipe pressure difference of inlet and outlet,pipe length,pipe radius,are gotten,and then hydraulic tank semiconductor refrigeration system is proposed. The semiconductor refrigeration system can control temperature at 37 ± 1°C.
文摘This paper analyzes the status and the development trend of refrigerator fresh-keeping technologies domestically and internationally, introduces several popular fresh-keeping technologies, elaborates on the principles and characteristics of several fresh-keeping technologies, and put forth that the future research should be focused on the different needs of customers.
基金supported by the National Natural Science Foundation of China(Grant No.51906136)the Institute of Advanced Studies(IAS)of the University of Warwick in the UK(Grant No C5E3X56470T)Shanghai Sailing Program(Grant No.19YF1423100)。
文摘An adsorption refrigeration system can be driven by low grade heat and uses natural refrigerant with the advantage of reducing the greenhouse gases emission.However,one of the weaknesses is its low efficiency and more importantly its high cost.The recovery of internal waste heat becomes therefore very important in order to improve the coefficient of performance(COP).Analysis based on pinch technology can be helpful to optimal heat recovery operation.In this paper,temperature-heat diagrams and problem tables for adsorption refrigeration systems are proposed and analyzed using Pinch Technology.The results show that pinch point is located between beds and the main waste heat needs to be recovered between beds.Dynamic characteristic(time factor)of adsorption refrigeration system is the main resistance for heat recovery.The effect of pinch point temperature difference on the system COP is not distinct.Furthermore,when the driving temperature is 90°C,the COP of adsorption refrigeration via optimization of pinch analysis is 0.73 which is fairly comparable to Li Br-water absorption refrigeration system.Pinch Technology can be adopted in different types of adsorption refrigeration systems(two-bed,four-bed,mass recovery,et al.).
基金supported by the Sci-ence and Technology Bureau of Nangping city,Fujian,China(Grant No.N2006Z01-4)
文摘Refrigerants used in refrigerators are an important source of ozone depleting substances released into the atmosphere, and can have a significantly negative effect on the hole in the ozone layer. But most emission of refrigerants is man-made, unrea-sonable and needless. Since in most emission cases the refrigerants are contained in the refrigerators, we can retrieve them by some technique that changes the 'manual emission' into manual retriev-ing. To promote the retrieval action and diminish the pollution, society can use economic, administrative and technical counter-measures, which can create a 'good-cycle' both 'harnessing pollu-tion and earning income simultaneously', reinforce the motive of retrieving, and retrieve most proportion of refrigerants used by all refrigerators. This 'good-cycle' method can be easily promoted, and also a valuable way to promote other forms of environmental protection. The three countermeasures have almost no social cost, even no cost at all.
基金the National Natural Science Founda-tion of China (12074371)CAS Interdisciplinary Innovation Team,Strategic Priority Research Program of Chinese Academy of Sciences (XDB28000000).
文摘Cryogenic electronics refers to the devices and circuits operated at cryogenic temperatures(below 123.15 K),which are made from a variety of materials such as insulators,conductors,semiconductors,superconductors and topological materials.The cryogenic electronics are endowed with some unique advantages that cannot be realized in room temperature,including high computing speed,high power performance and so on.Choosing the appropriate refrigeration tech-nology is critical for achieving the best performance of the cryogenic electronics.In this review,the cryogenic technology was divided into non-optical refrigeration and optical refrigeration,where non-optical refrigeration technologies are relatively conventional refrigeration technologies,while optical refrigeration is an emerging research field for the cooling of the chips.In the current work,the fundamental principles,applications and development prospects of the non-optical refrigeration was introduced,also the research history,fundamental principles,existing problems and application prospects of the optical refrigeration was thoroughly reviewed.
