Single alloy compressing-diffusing metal hydride heat pump/refrigerating method and system

Abstract

This invention is a kind of single alloy compression-diffusion type metal hydride heat pump / refrigeration method and its system. Pressure difference between metal hydride under solid solution phase and hydride phase is generated. Metal hydride absorbs hydrogen and releases heat at high- pressure side. It releases hydrogen and absorbs heat at low -pressure side. Through heat exchanger carrying away the generated heat / cold energy, heating / refrigerating is fulfilled. The hydrogen atoms, which are absorbed from metal hydride high- pressure side, are transferred to low pressure side through the inside of metal hydride continually by diffusion effect. This system includes compressor, one-way valve, hydrogen pipeline and diffusing bed. The diffusing bed includes pore filter sheet, low temperature heat exchanger, bed body insulating outer wall, metal hydride powder and high temperature heat exchanger.

Description

technical field [0001] The invention relates to a method and system in the technical field of refrigeration, in particular to a single alloy compression-diffusion metal hydride heat pump / refrigeration method and system. Background technique [0002] The traditional vapor compression heat pump / refrigeration system consumes a lot of energy, and the destructive effect of its freon working fluid on the atmosphere has also reached a worldwide consensus; the metal hydride heat pump / refrigeration system was born under such conditions. Metal hydride is a special alloy, which can reversibly absorb a large amount of hydrogen at a certain temperature and pressure, and release a large amount of reaction heat at the same time; its hydrogen storage density at room temperature can reach the density of liquid hydrogen, while the hydrogen storage pressure is much lower than that of hydrogen. Liquid hydrogen; the equilibrium pressure of the alloy increases rapidly with increasing temperature....

AI Technical Summary

Problems solved by technology

Obviously, the time-sharing, reversed-phase metal hydride heat pump / refrigeration technology cannot guarantee the stability of heating / cooling capacity; the alloy will expand and pulverize when absorbing hydrogen, and repeated hydrogen absorption and desorption can easily cause considerable expansion on the local wall of the container stress, thus reducing the reliability of the system; and in order to improve reliability, the existing system basically adopts thick-walled containers, and the heat capacity of the reaction bed is very large, but because the system is constantly switching between the state of absorbing and releasing heat, the heat The loss of heat / cooling capacity caused by capacity is also quite large, usually accounting for 20% to 40% of the theoretical heating / cooling capacity of the system

Therefore, the intermittent operation mode causes the heating / cooling capacity of the existing system to be unstable, the efficiency and reliability are not high, and there is still a long way to go before practical application

[0003] After searching the literature of the prior art, it was found that the patent name: "A metal hydride air-conditioning device", the application number: CN200420047871.0, this patent designed a complete air-conditioning device on the basis of the existing cycle, but failed to get rid of the " The cycle mode of the two systems is time-sharing and anti-phase, so it cannot solve the shortcomings of the existing metal hydride heat pump / refrigeration system, such as unstable heating / cooling capacity and low COP

In the prior art, no technology has been found that can achieve continuous and stable heating / cooling with a single metal hydride

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