A high-efficiency composite double-sided enhanced heat transfer tube

Abstract

The invention discloses a high-efficiency composite double-sided enhanced heat transfer tube, and both sides of the enhanced heat transfer tube are strengthened. It is characterized in that the inside of the tube is an internal thread strengthening structure, and the strengthening structure on the phase change side outside the tube changes according to the change of the heat transfer temperature difference. The invention mainly aims at the characteristics that the boiling and condensation heat transfer coefficients change with the heat flux density in the phase change heat transfer process. Different enhanced heat transfer structures processed outside the tube are just suitable for different heat flux ranges. At the same time, the present invention provides different condensation and boiling enhanced heat transfer structures for common heat flux ranges. This type of heat transfer tube is suitable for centrifugal and screw central air conditioners with large temperature differences, and can operate reliably in a wider range of evaporation and condensation temperatures. It can also be applied to heat pump systems for waste heat utilization and organic Rankine cycle, such as river water, sea water sources, sewage source heat pumps, waste heat recovery from thermal power plants, etc. It can also be applied to ice storage systems at night, which can reduce the power consumption during peak power consumption and save operating costs.

Description

technical field [0001] The invention belongs to the technical field of enhanced heat transfer pipes, in particular to a high-efficiency composite double-sided enhanced heat transfer pipe. Background technique [0002] In refrigeration, air conditioning, heat pump, waste heat utilization and ice storage industries, evaporators and condensers are the key heat exchange components in the unit system. For example, in a centrifugal water-cooled central air-conditioning unit, the refrigerant exchanges heat with water in the evaporator and absorbs the heat in the water to become steam, and the centrifugal compressor sucks in steam from the evaporator and compresses it, turning the low-temperature and low-pressure steam into high-temperature High-pressure steam, after being compressed, the high-temperature and high-pressure steam flows into the condenser and then dissipates heat to the cooling medium water to become a high-temperature and high-pressure liquid, which is then depressur...

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Problems solved by technology

[0005] At present, all the enhanced heat transfer tubes used to enhance the high-efficiency heat transfer of refrigerants adopt the same enhanced heat transfer structure on the same tube. The coefficient is low. This technology has been developed for nearly 40 years. It is very difficult to increase the heat transfer coefficient. Even if it is only 5%, it is very difficult.

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