Air-cooled air-condition finned tube evaporator of two-stage vapour-liquid separation
An air-cooled air conditioner and vapor-liquid separation technology, which is applied in the field of fin-tube evaporators of air-cooled air conditioners and fin-tube evaporators of air-cooled air conditioners, can solve the problem of reducing the heat transfer coefficient of the refrigerant side and ensuring the uniformity of flow distribution. and other problems, to achieve the effect of increasing the mass flow density, reducing the pressure drop along the path, and increasing the heat transfer coefficient
Inactive Publication Date: 2005-09-21
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
Therefore, when the flow rate of the evaporator is large, many shunts are often needed. The more shunts, the more difficult it is to ensure the uniformity of flow distribution; on the other hand, although increasing the shunts can reduce the refrigerant side pressure drop, but at the same time Also reduces the heat transfer coefficient on the refrigerant side
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[0013] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0014] Such as figure 1 As shown, the present invention includes a liquid supply pipe 1, a first-stage separation splitter 2, a liquid splitter pipe 3 of the first-stage separation splitter, a steam bypass pipe 4 of the first-stage separation splitter, and an evaporator heat exchange part 5 (consisting of heat exchange tubes and fins), the suction pipe 9 is characterized in that it also includes the second stage separation splitter 6, the liquid distribution pipe 7 of the second stage separation splitter, the steam side of the second stage separation splitter The through pipe 8; the first-stage separation splitter 2 and the second-stage separation splitter 6 are vertically arranged on both sides of the heat exchange part 5 of the evaporator, the liquid supply pipe 1 is connected to the inlet of the first-stage separation splitter 2, and t...
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The air-cooled air-conditioning fin tube evaporator with two-stage vapor-liquid separation mainly includes a heat exchange part of the evaporator and a two-stage vapor-liquid separation shunt. The two-phase refrigerant first flows into the first-stage separator for vapor-liquid separation, and the separated refrigerant liquid is diverted to each branch of the first stage for evaporation and heat exchange, and the refrigerant vapor is bypassed to the suction pipe. According to a reasonable structural design, the liquid entering each branch of the first stage is evaporated and heat-exchanged, and the dryness at the outlet of the first-stage branch reaches about 0.5. The separated refrigerant liquid is diverted to each branch of the second stage for evaporation and heat exchange, and the refrigerant vapor is bypassed to the suction pipe. The invention separates the refrigerant vapor twice at the inlet of the evaporator and the middle of the process and bypasses it to the suction pipe twice, and performs two-stage heat exchange and evaporation with different numbers of branches on the separated liquid, thereby reducing the pressure drop of the evaporator. The heat exchange efficiency is improved, and the number of branches of the evaporator and the number of heat exchange tubes are simplified.
Description
technical field [0001] The invention relates to a finned tube evaporator for an air-cooled air conditioner, in particular to a two-stage vapor-liquid separation air-cooled air-conditioning fin that can reduce the number of heat exchange tubes of the evaporator and reduce the pressure drop along the evaporator. A sheet tube evaporator belongs to the technical field of refrigeration. Background technique [0002] Finned tube evaporators used in air-cooled air conditioners generally adopt a split structure, that is, the low-quality vapor-liquid two-phase refrigerant passes through a flow distributor, enters the evaporator in several ways for heat exchange, and finally absorbs heat and evaporates. It becomes superheated gas and then merges into one path, and enters the compressor through the suction pipe. When using a flow distributor, it is hoped that the flow distribution will be as even as possible. However, since the refrigerant participating in the distribution is in a co...
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IPC IPC(8): F25B30/02F25B39/02
CPCF25B2400/23F25B39/02
Inventor 张春路
Owner SHANGHAI JIAOTONG UNIV