A variable load control system and control method for a rotary room temperature magnetic refrigerator
A room temperature magnetic refrigerator and control system technology, applied in refrigerators, refrigeration and liquefaction, machines using electric/magnetic effects, etc., to achieve the effect of continuous capacity adjustment and efficient operation
Active Publication Date: 2020-08-18
XI AN JIAOTONG UNIV
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Problems solved by technology
At this stage, the room temperature magnetic refrigeration prototype can achieve an inverse Carnot cycle efficiency of 18%, which still has a certain gap with the efficiency of vapor compression refrigeration equipment
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Embodiment Construction
[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0026] The invention relates to the heat effect produced by phase transition of a magnetic working medium under the excitation of an external alternating magnetic field. The magnetic working medium releases heat when the external magnetic field intensity increases and absorbs heat when the external magnetic field intensity decreases. The phase transition can be a first order phase transition or a higher order phase transition.
[0027] see figure 1 , in the rotary magnetic refrigerator based on the variable load control system of the present invention, the variable-speed driving motor 105 is decelerated by the speed-changing mechanism 104, and is connected with the main shaft 103, drives the magnet 102 to rotate, and is arranged on the circumferential direction perpendicular to the plane of the main shaft. The regenerative magnetic working medium bed 101 of ...
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The invention relates to a variable load control system of a rotating room temperature magnetic refrigerator and a control method thereof. The control system comprises a plurality group of regenerative magnetic working medium beds, magnetic bodies are arranged on the inner side and outer side of the magnetic working medium bed, the magnetic bodies produce a periodic magnetic field through rotating, the regenerative magnetic working medium bed is connected with an external heat exchange fluid pipe network, a rotating flow distributing valve capable of synchronously rotating with the magnet bodies is arranged on the recuperative magnetic working medium bed, the rotating flow distributing valve is connected with a heat exchanger, a variable speed fluid driving pump and a flow sensor are arranged on a connecting pipe, a temperature sensor is arranged on the heat exchanger. The control method comprises the steps: the temperature sensor and the flow sensor transmit the acquired signals to acontroller, and the controller adjusts the change period of the magnetic field and the flow of the heat exchange fluid through a rotating speed controller. According to the invention, the capacity adjustment of the magnetic refrigerator can be continuously adjusted and the efficient operation of the magnetic refrigerator can be achieved under any conditions.
Description
technical field [0001] The invention relates to refrigeration technology, in particular to a variable load control system and control method for a rotary room temperature magnetic refrigerator. Background technique [0002] Vapor compression cycle is currently the most widely used refrigeration technology in the world, and is widely used in air conditioners, refrigerators and freezers. Since the beginning of the 20th century, the core components such as compressors and heat exchangers in the vapor compression cycle have undergone several generations of development. At present, the best vapor compression refrigeration system has a refrigeration efficiency close to 40%-45% reverse Carnot cycle. theoretical efficiency. However, the vapor compression refrigeration system uses a large number of refrigerants such as chlorofluorocarbons and hydrofluorocarbons that are harmful to the environment and climate change. The greenhouse gas effect of these refrigerants is mostly CO 2 Mor...
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IPC IPC(8): F25B21/00
CPCF25B21/00Y02B30/00Y02B30/70
Inventor 钱苏昕鱼剑琳晏刚
Owner XI AN JIAOTONG UNIV