Heat exchanger capable of automatically defrosting or deicing

Abstract

The invention relates to the technical field of heat exchangers, and discloses a heat exchanger capable of automatically defrosting or deicing. The heat exchanger comprises a tube bank and fins. A refrigerating medium can be introduced into the tube bank, the fins are arranged on the outer wall of the tube bank, and the heights of the fins extend in the radial direction of the tube bank. Each fincomprises a first heat conduction part and a second heat conduction part that are sequentially connected to the tube bank, and the heat conductivity coefficient of the second heat conduction part is smaller than that of the first heat conduction part and the tube bank. The outer surface of the first heat conduction part and the outer surface of the tube bank are each coated with a micron-scale ornano-scale hydrophobic layer, and the hydrophobic layers are hydrophobic coatings or hydrophobic oil films. According to the heat exchanger capable of automatically defrosting or deicing, the heat conductivity coefficient of the second heat conduction part is relatively low, frost or ice on two sides of the tube bank can be separated under a cold release working condition, the tube bank is prevented from being annularly wrapped by the frost or ice, and meanwhile, a frost layer or an ice layer can automatically fall off under the action of gravity through the hydrophobic coatings or the hydrophobic oil films, and a heating and defrosting process can be omitted, and the cold release heat exchange efficiency of the heat exchanger is improved.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a heat exchanger capable of automatic defrosting or deicing. Background technique [0002] With the improvement of people's living standards, the demand for energy is also increasing, such as heat pump heating in winter in the north, logistics cold supply chain, etc. The transmission of cold and heat here involves the use of heat exchangers. For conventional fluid medium heat transfer, high heat transfer efficiency can be achieved by increasing the thermal conductivity of heat exchanger materials, increasing the heat transfer area, and increasing the flow velocity of conventional fluids, which can respond to the national requirements for energy saving and emission reduction . However, some heat exchanger systems involve the phase change of the medium, especially the gas-solid and liquid-solid phase changes, and these situations often become complicated. Such as an impo...

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Problems solved by technology

However, this liquefaction time is often relatively long, which leads to a large loss of total transport cooling capacity

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