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Falling film type shell-tube evaporator and air conditioning system

An evaporator and falling film technology, which is applied in the field of air conditioning, can solve the problems of not considering the overheating of the return air, the influence of the adjustment of the refrigerant liquid level, and the poor control ability of the degree of superheating of the return air, so as to achieve the effect of being beneficial to the safety of suction.

Inactive Publication Date: 2019-07-23
HANGZHOU SAFETY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Problem: The charging amount of refrigerant has a major impact on liquid level regulation, and at the same time, the ability to control the superheat of return air is poor
[0012] Disadvantages: The return air superheat of the falling film heat exchanger is usually low, and the use of suction superheat control will result in a small opening of the expansion valve, low evaporation temperature, and the capacity of the entire refrigeration system cannot be fully utilized
[0016] Disadvantages: A new set of calculation logic needs to be designed and embedded in PLC, and the expansion valve needs to be selected accordingly, which is difficult for general OEMs to adapt
On the other hand, the overheating of the return air is not considered

Method used

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  • Falling film type shell-tube evaporator and air conditioning system
  • Falling film type shell-tube evaporator and air conditioning system
  • Falling film type shell-tube evaporator and air conditioning system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment one, refer to figure 1 with figure 2 As shown, a falling film shell and tube evaporator includes a cylindrical shell 1, a heat exchange tube bundle 4 arranged at the lower part of the inner cavity of the cylindrical shell, and a liquid distributor 3 arranged at the upper part of the inner cavity of the cylindrical shell. The upper part of the cylindrical shell is connected with a liquid inlet pipe 11 and an air outlet pipe 12, and the upper part of the inner cavity of the cylindrical shell is provided with a finned heat exchanger 2 between the liquid distributor 3 and the liquid inlet pipe 11. The inlet of the heater 2 is connected with the liquid inlet pipe 11 , and the outlet is connected with the inlet of the liquid distributor 3 . In this embodiment, a section of finned heat exchanger 2 is installed before the upper part of the cylinder of the evaporator and the liquid distributor 3 to solve the problem of overheating of the return air. The fin heat ex...

Embodiment 2

[0045] Embodiment two, refer to image 3 As shown, an air-conditioning system includes a condenser, a filter and the falling film shell-and-tube evaporator, and the refrigerant liquid condensed by the condenser is directly sent to the inlet of the falling-film shell-and-tube evaporator after being filtered by the filter. A compressor is also connected between the liquid pipe, the condenser and the falling film shell and tube evaporator.

[0046] The connecting liquid pipe between the condenser and the falling film shell-and-tube evaporator is provided with a throttling device for variable load adjustment. The refrigerant liquid condensed by the condenser is filtered through a filter, and then enters the drop-off device after passing through the throttling device. The liquid inlet pipe of the membrane shell and tube evaporator. The throttle device is a throttle orifice or an electric throttle valve.

[0047] When the throttling orifice is used, the aperture of the throttling ...

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PUM

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Abstract

The invention discloses a falling film type shell-tube evaporator and an air conditioning system. The falling film type shell-tube evaporator comprises a cylindrical shell, heat exchange tube bundlesand a liquid distributor, wherein the heat exchange tube bundles are arranged at the lower part of an inner cavity of the cylindrical shell, the liquid distributor is arranged at the upper part of theinner cavity of the cylindrical shell, the upper part of the cylindrical shell is connected with a liquid inlet tube, heat exchangers are arranged at the position, between the liquid distributor andthe liquid inlet tube, of the upper part of the inner cavity of the cylindrical shell, inlets of the heat exchangers are connected with the liquid inlet tube, and outlets of the heat exchangers are connected with an inlet of the liquid distributor. According to the falling film type shell-tube evaporator, the fin heat exchangers are arranged, phase-change-free heat exchange between a liquid refrigerant and a gaseous refrigerant is realized, a certain gas superheat degree is obtained, and the air suction safety of a compressor is facilitated; moreover, the fin heat exchangers act as air returnbaffles, so that an air return baffle structure of the liquid distributor can be omitted; and furthermore, the undercooling capacity of the fin heat exchangers is high, the liquid refrigerant does notflash basically, and liquid supplying is stable.

Description

technical field [0001] The present invention relates to air conditioning technology. Background technique [0002] The falling film shell-and-tube evaporator is a new type of shell-and-tube heat exchanger that has been developed in the refrigeration industry in recent years. Compared with the flooded heat exchanger, the refrigerant charge is reduced by more than 30%, and the oil concentration is high. , can return oil efficiently, under the same configuration, the evaporation efficiency is 15-20% higher than that of ordinary flooded liquid, and can achieve higher energy efficiency. In recent years, it has been paid more and more attention and widely used in the refrigeration industry. [0003] The falling film evaporator belongs to the large space of the shell where the refrigerant evaporates. The refrigerant is supplied from the liquid inlet pipe on the upper part of the cylinder, and is sprayed from top to bottom by a specially designed liquid distributor to exchange heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B39/02F25B41/06F25B41/34
CPCF25B39/02F25B41/30
Inventor 舒迎胡陈王国民
Owner HANGZHOU SAFETY EQUIP