"Science" magazine, published online recently, introduced the joint scientific research achievements of Nankai University in China and Texas State University in Dallas, USA: a new strategy of flexible refrigeration-"twisted heat refrigeration". This new refrigeration technology expands a new sector in the refrigeration field, which will provide a new way to reduce energy losses in the refrigeration field. The discovery came from the team of Professor Liu Zunfeng from the State Key Laboratory of Medicinal Chemistry and Biology, School of Pharmacy, and Key Laboratory of Functional Polymers of the Ministry of Education of Nankai University, and Professor of Texas State University, Dallas, and Lecture Professor Yang Shixian from Nankai University. .Baughman) team's collaborative research. Liu Zunfeng and Lei Bowman are co-corresponding authors of the thesis, and Nankai University is the first unit of the thesis. They found that changing the twist inside the fiber can achieve cooling. Due to higher refrigeration efficiency, smaller size and suitable for many common materials such as natural rubber, fishing line and nickel-titanium alloy, the "twisted refrigerator" made based on this method has also become promising. According to the statistics of the International Refrigeration Research Institute, the current consumption of air-conditioning and refrigerator refrigeration in the world accounts for about 20% of the global power loss. Nowadays, the widely used principle of air compression refrigeration, its Carnot efficiency is generally less than 60%. The gas released by the traditional refrigerator during the cooling process is exacerbating global warming. With the increase in human demand for refrigeration, it is urgent to explore new refrigeration theories and solutions to further improve refrigeration efficiency, reduce costs, and reduce the size of refrigeration equipment. The rubber band will heat when stretched, and the temperature will decrease after retracting. This phenomenon is called "elastic heat cooling". Other solid-state refrigeration technologies include new solutions such as electrothermal refrigeration, magnetocaloric refrigeration, and nickel-titanium shape memory materials. However, the Carnot efficiency of these refrigeration technologies has not exceeded the air compression refrigeration technology. Through the "torsion heat refrigeration" technology, people only need to untwist to achieve Carnot efficiency of 67%. This means that by using common materials such as rubber and fishing line for cooling, it is expected to achieve higher Carnot efficiency, thereby saving more power and reducing cooling costs. "Interestingly, we found that the 'twisted heat refrigeration' scheme is also suitable for fishing lines and textile threads. Before, people did not realize that these ordinary materials can be used for refrigeration." Liu Zunfeng said. The researchers also found that when the "torsion heat refrigeration" technology is applied to a nickel-titanium shape memory alloy with greater strength and faster heat transfer, the cooling effect is better, and only a lower twist is needed to obtain a larger Cool down. "These preliminary findings still have a long way to go before the commercialization of the" torsion refrigerator ", and there are many opportunities and challenges," Ray Bowman said. "These challenges include the development of new devices and materials to improve Cycle life, rational use of input work to increase efficiency. Potential opportunities include, in addition to using commercially available existing materials, to further optimize the 'twisted heat refrigeration' material to obtain the best performance. " It is understood that Tsinghua University, Wuhan University, Georgia Southern University, Tsinghua University Shenzhen International Graduate School, Lindeco (USA) Research Center, Campinas State University, Tianjin University of Technology, Liaoning University of Science and Technology, China Pharmaceutical University and other units participated This research. (Reporter Chen Jianqiang Liu Qian Correspondent Wu Junhui)
Capsule Pressure Gauge
Capsule pressure gauge is used to measure the
pressure or negative pressure of various non-solidified or noncrytalline liquid
media with certain corrosiveness. The corrosion resistance depends on the
diaphragm materials. The instrument is composed of a measuring
system(corrugated diaphragms), the drive indication mechanism(including a
connecting rod.
a gear drive mechanism, pointers and a dial) and a
housing(including a qauge case and a cover ring). The housing of the instrument
is of leakproof structure with high tightness thus it can protect the inside
from pollution. The working principle of the instrument is based on the deformation
of elastic elements(diaphragms in the measuring system). Uhder the pressure of
the tested media, the diaphragm responds with elastic deformation-displacement
which is then magnified by the drive mechanism of the connecting rod unit. The
pointer fixed to the gear will indicate the measured value on the dial.
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