Finned coil tube for antifreeze air source heat pump

Abstract

The invention discloses a finned coil for an anti-freezing air source heat pump. The air source heat pump comprises the finned coil, a liquid storage tank connected to the finned coil, a gas-liquid separator connected to the liquid storage tank and a compressor connected to the gas-liquid separator; the finned coil comprises a plurality of heat exchange tubes, a plurality of fins connected to theheat exchange tubes in a swelling manner, a liquid collecting pipe communicating to the heat exchange tubes, a gas collecting pipe communicating to the heat exchange tubes and a defrosting pipeline arranged below the heat exchange tubes and connected to the liquid collecting pipe through a one-way guide part. In a normal heat supply state, a low-temperature and low-pressure refrigerant does not enter the defrosting pipeline, so that an ice layer at the bottom is prevented from being accumulated; during defrosting, part of high-temperature and high-pressure gas refrigerant enters the defrostingpipeline at the bottom of the coil to dissolve frost effectively, so that the heat exchange efficiency of the finned coil and the reliability of the compressor are improved effectively, and the heating effect is relatively good.

Description

technical field [0001] The invention belongs to the technical field of air source heat pumps, and in particular relates to a finned coil tube for an antifreeze type air source heat pump. Background technique [0002] When the conventional air source heat pump is heating in winter, the finned coil is used as an evaporator, and the low-temperature and low-pressure liquid refrigerant absorbs heat from the air and evaporates into gas through evaporation in the finned coil evaporation circuit. Since the air contains water vapor, the water vapor in the air is precipitated in the form of condensed water or frost during the cooling process by the low-temperature and low-pressure liquid refrigerant. [0003] When the fin surface of the coil is frosted thickly, the heat transfer efficiency of the coil decreases with the increase of the heat transfer resistance of the frost layer between the refrigerant and the air, and the air volume decreases due to the increase of wind resistance wh...

AI Technical Summary

Problems solved by technology

When the next time of defrosting, the bottom of the coil will melt slowly due to the thicker ice, which will cause the defrosting water flowing down from the upper part of the coil to flow to the ice layer, which will be blocked and the discharge will not be smooth. , the defrosted water will freeze again

[0005] After several frosting and defrosting cycles, the ice at the bottom of the coil will gradually accumulate upwards, resulting in a serious attenuation of air volume during heating operation, a rapid decline in evaporation temperature, heating capacity, and heating energy efficiency. Most of the liquid refrigerant in the coil evaporation circuit corresponding to the layer cannot be effectively evaporated into gas. After entering the compressor, it will cause the compressor to run with liquid, causing the lubrication and sealing performance of the dynamic and static scroll, bearing failure and shaft sleeve wear, which seriously affects Compressor life and operational reliability

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