A flat tube counterflow heat exchanger

Abstract

A counter flow type heat exchanger provided with flat tubes comprises the flat tubes and fins, wherein sealing strips are mounted on two sides of each fin; the flat tubes and the fins are arranged alternatively in parallel; and the flowing directions of the flat tubes are parallel to the flowing directions of the fins outside the flat tubes, so that counter flow heating exchange is formed. The counter flow type heat exchanger provided with the flat tubes is compact in structure, small in occupied space, high in pressure resistance grade and wide in application range and can be used for an evaporator and a condenser taking carbon dioxide as a refrigerant, particularly large-scale heat exchange capability can be formed, the counter flow type heat exchanger is applicable to an evaporator and a condenser of a central air conditioner, the efficient evaporator and condenser allowing the refrigerant to pass through micro channels and water to flow from the outside of the micro channels are obtained, and energy is saved.

Description

technical field [0001] The invention relates to a flat tube counter-flow heat exchanger. Background technique [0002] In the 21st century, energy and environmental protection issues have become more and more prominent, and have become the bottleneck of my country's economic development, especially the frequent occurrence of smog in many large and medium-sized cities in my country, which not only causes harm to the health of ordinary people, but also restricts the development of my country's economy. Development and growth, such as prolonged smog weather will affect the photosynthesis of crops, resulting in reduced production of agricultural products, has become a major issue of the national economy and people's livelihood. The key to energy conservation and emission reduction is to carry out technological transformation on large emitters and ranks, such as thermal power plants, building material production enterprises, smelting, automobile exhaust, air conditioning and heati...

AI Technical Summary

Problems solved by technology

[0021] However, the current microchannel heat exchanger technology also has the following disadvantages: ①It is easy to build a water bridge on the fins and block the air duct; ②As an evaporator, the liquid fluid distribution is not uniform enough, which affects the heat exchange effect; ③The design is not flexible enough, which affects the actual application effect, it is difficult to use it as an evaporator; ④The flow of the microchannel is too long, which not only increases the fluid resistance and consumes too much circulation pump power, but also the effect of the first half of the channel is good, and the effect of the second half is very poor; ⑤The outer part of the flat tube The fin channel and the inner channel of the flat tube form a cross-flow heat transfer mode, and the average temperature difference is smaller than the counter-current heat transfer mode; ⑥The heat transfer process of the fins on the outer side of the flat tube is very short, and the utilization rate of wind is extremely low; ⑦It is difficult to achieve large-scale Heat exchange, a larger flow rate will lead to a decrease in its efficiency

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