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Double-level falling film evaporator

A stage evaporator and evaporator technology, applied in the field of shell-and-tube evaporators, can solve the problems of low heat transfer efficiency and poor heat transfer efficiency, and achieve the effect of increasing refrigerant flow and reducing power consumption

Inactive Publication Date: 2014-03-26
SHANGHAI THERMO TECH ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of refrigerant from the top, there is no liquid film outside part of the heat exchange tubes, and the heat transfer efficiency is poor; in addition, the refrigerant that is not completely evaporated gathers at the bottom and evaporates in a flooded manner through the heat exchange tubes at the bottom Evaporation mechanism, low heat transfer efficiency

Method used

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  • Double-level falling film evaporator
  • Double-level falling film evaporator

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment one, such as figure 1 As shown, the double-stage falling film evaporator of the present invention includes a high-temperature evaporation cylinder 2 and a low-temperature evaporation cylinder 7, and a refrigerant inlet 3, a refrigerant outlet 4, and a refrigerant outlet 5 are arranged on the high-temperature evaporation cylinder, and the low-temperature evaporation A refrigerant inlet 8 and a refrigerant outlet 9 are arranged on the cylinder body. The refrigerant liquid from the condenser enters the high-temperature evaporation cylinder 2 after passing through the expansion distribution mechanism 1, the refrigerant evaporated into gas flows out from the outlet 4, and enters the middle suction port 12 of the compressor, and the unevaporated refrigerant liquid flows out from the outlet 5 The outflow enters the low-temperature evaporation cylinder 7 through the expansion distribution mechanism 6, evaporates into a gas, flows out from the refrigerant outlet 9, an...

Embodiment 2

[0017] Embodiment two, such as figure 2 As shown, the double-stage falling film evaporator of the present invention includes a high-temperature evaporation chamber 15 and a low-temperature evaporation chamber 16 in the same cylinder, and the refrigerant first flows into the shell side of the high-temperature evaporation chamber 15 from the refrigerant inlet 14. After the outer surface flows and evaporates, it flows out from the outlet 17. The incompletely evaporated refrigerant liquid flows from the bottom of the high-temperature evaporation chamber 15 into the throttling distribution mechanism in the low-temperature evaporation chamber 16, and then sprays on the outer surface of the heat exchange tube. Outlet 18 flows out.

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Abstract

The invention discloses an evaporator which comprises an evaporator cylinder and a water chamber. The evaporator is characterized in that the evaporator comprises two independent cylinders or cavities, each cylinder or cavity is provided with a refrigerating fluid inlet and a refrigerating fluid outlet, and the first-level evaporator cylinder or cavity is provided with another refrigerating fluid outlet; a water chamber corresponding to each cylinder or cavity is further respectively provided with a chilled water inlet and a chilled water outlet. According to the double-level film type evaporator, chilled water at two temperatures can be prepared through one refrigerating machine; after the refrigerating fluid flows through the first-level evaporator cylinder or cavity, secondary collection and distribution are achieved, distribution is evener, and high-efficiency falling-film heat transmission is thoroughly achieved through the two levels of evaporation processes, so that the evaporation temperature is increased and the refrigerating capacity is increased, or the size of a heat exchanger is reduced and cost is saved; after double-level compression is reduced, power consumption of a compressor is reduced and the unit energy efficiency ratio is improved, and the optimal heat exchange performance of the evaporator is achieved.

Description

technical field [0001] The invention relates to a refrigeration device, in particular to a shell-and-tube evaporator. Background technique [0002] The falling film evaporator is a shell-and-tube heat exchanger. The refrigerant flows from top to bottom in the shell side space of the heat exchange tube, forming a liquid film outside the heat exchange tube. The refrigerant exchanges heat with the heat exchange during the liquid film descent. The medium in the tube exchanges heat, evaporates into gas and flows out from the top outlet. Due to the uneven distribution of refrigerant from the top, there is no liquid film outside part of the heat exchange tubes, and the heat transfer efficiency is poor; in addition, the incompletely evaporated refrigerant collects at the bottom and evaporates in a flooded manner through the heat exchange tubes at the bottom Mechanism evaporation, low heat transfer efficiency. Contents of the invention [0003] The object of the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B39/02
Inventor 高原詹振乾郑小庆
Owner SHANGHAI THERMO TECH ENERGY TECH