CN109682119B - Evaporation coil pipe with efficient liquid separation function - Google Patents

Evaporation coil pipe with efficient liquid separation function Download PDF

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Publication number
CN109682119B
CN109682119B CN201910078835.1A CN201910078835A CN109682119B CN 109682119 B CN109682119 B CN 109682119B CN 201910078835 A CN201910078835 A CN 201910078835A CN 109682119 B CN109682119 B CN 109682119B
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China
Prior art keywords
liquid
gas
pipe
communicated
bin
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CN201910078835.1A
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Chinese (zh)
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CN109682119A (en
Inventor
朱宗升
李再鑫
刘增辉
王园
薛晓宇
王修芳
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Tianjin University of Commerce
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Tianjin University of Commerce
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/02Heat pumps of the compression type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00Evaporators; Condensers
    • F25B39/02Evaporators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00Evaporators; Condensers
    • F25B39/04Condensers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention discloses an evaporation coil with a high-efficiency liquid separation function, which comprises a buffer tube; the front end of the buffer tube is communicated with a liquid inlet tube through an expansion valve, a stop valve and a liquid inlet tube in sequence; the rear end of the buffer tube is communicated with the front end of the liquid bin; the rear end of the liquid bin is communicated with the front end of the air bin through an air passage; the bottom of the liquid bin is communicated with a plurality of liquid separating pipes; the bottom of the air bin is communicated with a plurality of air distribution pipes; the upper part of the rear end of the gas bin is communicated with a gas-liquid separator through a liquid return pipe; the gas-liquid separator is communicated with an air outlet pipe; each liquid separating pipe is communicated with the upper end of one inner layer liquid pipe; each gas-distributing pipe is communicated with the upper end of one outer-layer gas pipe; the lower ends of the inner liquid pipe and the outer air pipe are communicated with a gas collecting pipe; the gas collecting pipe is also communicated with the gas-liquid separator through a gas return pipe. The invention can effectively separate the gas and the liquid of the throttled gas-liquid two-phase fluid, solves the problem of uneven liquid separation and improves the heat exchange performance of the whole evaporating coil.

Description

Evaporation coil pipe with efficient liquid separation function
Technical Field
The invention relates to the technical field of evaporation coils, in particular to an evaporation coil with an efficient liquid separation function.
Background
At present, the heat pump system can realize heat transfer and has been widely applied to the work and life of people.
In a conventional heat pump system, after the liquid refrigerant is throttled by a throttle valve, the liquid refrigerant becomes a gas-liquid two-phase fluid, and then the gas refrigerant enters each coil (i.e., an evaporation coil) of an evaporator through a liquid separator, and the heat exchange performance of the refrigerant in the evaporation coil is reduced due to the mixing of gas (i.e., the mixing of gaseous refrigerant).
Meanwhile, in order to ensure the operation safety of the compressor, the refrigerant at the outlet of the evaporating coil is required to be in a gas overheat state, so that the heat exchange area of the evaporating coil cannot be efficiently utilized, the heat exchange performance of the evaporating coil is further deteriorated, and the utilization efficiency and the heat exchange performance of the evaporating coil are seriously affected.
Disclosure of Invention
Therefore, the invention aims to provide the evaporating coil with the efficient liquid separation function, which can effectively separate the gas phase fluid from the liquid phase fluid after throttling, improves the heat exchange performance of the whole evaporating coil, is beneficial to wide application and has great production practice significance.
Therefore, the invention provides an evaporation coil with high-efficiency liquid separation function, which comprises a buffer tube;
the front end of the buffer tube is communicated with a liquid inlet tube through an expansion valve, a stop valve and a liquid inlet tube in sequence;
the rear end of the buffer tube is communicated with the front end of the liquid bin;
the rear end of the liquid bin is communicated with the front end of the air bin through an air passage;
the bottom of the liquid bin is communicated with a plurality of liquid separating pipes;
the bottom of the air bin is communicated with a plurality of air distribution pipes;
the upper part of the rear end of the gas bin is communicated with a gas-liquid separator through a liquid return pipe;
the gas-liquid separator is communicated with an air outlet pipe;
each liquid separating pipe is communicated with the upper end of one inner layer liquid pipe;
each gas-distributing pipe is communicated with the upper end of one outer-layer gas pipe;
the lower ends of the inner liquid pipe and the outer air pipe are communicated with a gas collecting pipe;
the gas collecting pipe is also communicated with the gas-liquid separator through a gas return pipe.
Wherein the liquid bin is used for storing low-pressure refrigerant liquid.
The liquid bin is internally provided with a liquid level meter which is used for measuring the liquid level of the refrigerant liquid in the liquid bin in real time and then sending the liquid level meter to the expansion valve;
the expansion valve is an electronic expansion valve;
the liquid level meter is in signal connection with the expansion valve;
the expansion valve is used for correspondingly controlling the opening degree of the expansion valve according to the liquid level fed back by the liquid level meter.
The bottom of the liquid bin is provided with a plurality of liquid outlet holes, and each liquid outlet hole is welded with a liquid separating pipe;
the bottom of the air bin is provided with a plurality of air outlet holes, and each air outlet hole is welded with an air distribution pipe.
Wherein the height of the airway bottom surface is higher than the height of the axial center line of the buffer tube.
The liquid separation pipe is used for uniformly distributing the refrigerant liquid in the liquid bin to an inner layer liquid pipe in the evaporation coil;
and the gas distribution pipe is used for uniformly distributing the gas-liquid mixed refrigerant in the gas bin to the outer layer gas pipe in the evaporating coil.
Wherein the lengths and the pipe diameters of the liquid separation pipes are kept consistent;
the lengths and the pipe diameters of the plurality of gas distribution pipes are kept consistent.
Compared with the prior art, the evaporation coil with the efficient liquid separation function can effectively separate gas and liquid of throttled gas-liquid two-phase fluid, solves the problem of uneven liquid separation, improves the heat exchange performance of the whole evaporation coil, is beneficial to wide application, and has great production practice significance.
In addition, for the invention, aiming at the problem of back air overheat, the gas-liquid two-phase fluid at the outlet of the evaporation coil can be in a near-saturation state, so that the heat exchange performance of the whole evaporation coil is further improved.
Drawings
FIG. 1 is a schematic diagram of an evaporation coil with efficient liquid separation function according to the present invention;
in the figure, 1 is a liquid inlet pipe, 2 is a stop valve, 3 is an expansion valve, 4 is a buffer pipe, and 5 is a liquid bin;
6 is a liquid level meter, 7 is an air passage, 8 is an air bin, 9 is a liquid separating pipe and 10 is an air separating pipe;
11 is an inner layer liquid pipe, 12 is an outer layer air pipe, 13 is a gas collecting pipe, 14 is a gas return pipe, and 15 is a gas-liquid separator;
16 is a liquid return pipe and 17 is an air outlet pipe.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the drawings and embodiments.
Referring to fig. 1, the invention provides an evaporation coil with efficient liquid separation function, comprising a buffer tube 4;
the front end of the buffer tube 4 is communicated with a liquid inlet tube 1 through an expansion valve 3, a stop valve 2 in sequence;
the rear end of the buffer tube 4 is communicated with the front end of the liquid bin 5;
the rear end of the liquid bin 5 is communicated with the front end of the air bin 8 through an air passage 7;
the bottom of the liquid bin 5 is communicated with a plurality of liquid separating pipes 9;
the bottom of the air bin 8 is communicated with a plurality of air distribution pipes 10 (not limited to the two shown in fig. 1);
the upper part of the rear end of the gas bin 8 is communicated with a gas-liquid separator 15 through a liquid return pipe 16;
the gas-liquid separator 15 is communicated with an air outlet pipe 17;
each liquid separating pipe 9 is communicated with the upper end of one inner layer liquid pipe 11;
each gas-distributing pipe 10 is communicated with the upper end of one outer-layer gas pipe 12;
the lower ends of the inner liquid pipe 11 and the outer air pipe 12 are communicated with a gas collecting pipe 13;
the gas collecting pipe 13 is also communicated with a gas-liquid separator 15 through a gas return pipe 14.
In a specific implementation of the invention, the liquid bin 5 is used for storing low-pressure refrigerant liquid.
In the invention, in particular implementation, a liquid level meter 6 is arranged in the liquid bin 5 and is used for measuring the liquid level of the refrigerant liquid in the liquid bin 5 in real time and then sending the liquid level to the expansion valve 3;
the liquid level gauge 6 is in signal connection with the expansion valve 3 (for example, wired connection is performed through a signal wire);
the expansion valve 3 is configured to correspondingly control the opening degree (the higher the liquid level is, the smaller the opening degree is, and conversely the lower the liquid level is, the larger the opening degree is) according to the liquid level fed back by the liquid level meter 6.
In the invention, in particular implementation, the bottom of the liquid bin 5 is provided with a plurality of liquid outlet holes, and each liquid outlet hole is welded with a liquid separation pipe 9;
the bottom of the air bin 8 is provided with a plurality of air outlet holes, and each air outlet hole is welded with an air distribution pipe 10.
In the present invention, the liquid inlet pipe 1 is used for connecting a refrigerant liquid storage device (for example, a condenser in a refrigeration system, or of course, other devices capable of outputting refrigerant liquid) to the evaporation coil;
the stop valve 2 is used for controlling the delivery of the refrigerant liquid, and is opened when the power is on and closed when the power is off;
the expansion valve 3 is used for realizing the conversion of high-pressure refrigerant liquid into gas-liquid two-phase low-pressure fluid. In the invention, the expansion valve 3 adopts an electronic expansion valve, and the adjusting signal of the electronic expansion valve is the refrigerant liquid level in the liquid bin 5;
the buffer tube 4 ensures that the flow rates of gas and liquid in the refrigerant are changed in an unequal manner through the abrupt expansion of the tube diameter (the tube diameter of the buffer tube 4 is obviously larger than the tube diameter of a connecting tube between the expansion valve 3 and the inlet at the left end of the buffer tube 4), meanwhile, the flow rates are reduced, the liquid flows along the bottom of the tube and the gas flows along the top of the tube, so that the buffer tube is used for realizing primary gas-liquid separation;
in the present invention, in particular, the bottom surface of the air channel 7 is higher than the axial center line of the buffer tube 4, that is, the lower boundary of the air channel 7 is higher than the axial center line of the buffer tube 4, so that the air channel 7 can block the refrigerant liquid in the liquid bin 5 and simultaneously make the refrigerant gas with lighter mass and floating upwards enter the gas bin 8, thereby ensuring the gas-liquid separation effect.
For the invention, the gas bin 8 is filled with refrigerant gas, the bottom of the gas bin 8 is provided with a hole for welding the gas distribution pipe 10, and the upper side is provided with a hole for screwing the liquid return pipe 16.
The liquid separation pipes 9 are used for uniformly distributing the refrigerant liquid in the liquid bin 5 to the inner liquid pipes 11 in the evaporating coil, and the lengths and the pipe diameters of the liquid separation pipes 9 are kept consistent;
the gas-distributing pipes 10 are used for uniformly distributing the gas-liquid mixed refrigerant in the gas bin 8 to the outer-layer gas pipes 12 in the evaporating coil, and the lengths and the pipe diameters of the plurality of gas-distributing pipes 10 are kept consistent;
the inner liquid pipe 11 is positioned in the middle of the outer air pipe 12, the upper end of the inner liquid pipe is connected with the liquid separating pipe 9, and the lower end of the inner liquid pipe is connected with the gas collecting pipe 13 and is a main heat exchange pipe;
the outer-layer air pipes 12 are positioned on two sides of the inner-layer liquid pipe 11, the upper ends of the outer-layer air pipes are connected with the air distribution pipes 10, and the lower ends of the outer-layer air pipes are connected with the air collection pipes 13;
the gas collecting pipe 13 is used for collecting the refrigerant subjected to heat exchange and then conveying the refrigerant to the gas-liquid separator 15 through the gas return pipe 14;
one end of the air return pipe 14 is connected with the air collecting pipe 13, and the other end of the air return pipe is connected with the gas-liquid separator 15, so that the refrigerant is introduced into the gas-liquid separator 15 from the air collecting pipe 13;
the gas-liquid separator 15 is a hollow container, and is used for being respectively connected with the air return pipe 14, the air outlet pipe 17 and the liquid return pipe 16, so that the gas-liquid separator has a gas-liquid separation function, the gas-liquid two-phase refrigerant introduced through the air return pipe 14 is separated in the gas-liquid separator 15, the liquid enters the liquid return pipe 16, and the gas enters the air outlet pipe 17;
one end of the liquid return pipe 16 is connected with the separator 15, and the other end is connected with the gas bin 8, so that liquid in the gas-liquid separator 15 can be introduced into the gas bin 8, and the heat exchange capacity of the outer-layer air pipe 12 is improved;
the gas outlet pipe 17 is used for conveying the gas in the gas-liquid separator 15 to other equipment (such as a compressor of a refrigeration system, etc.).
It should be noted that, in the present invention, after the buffer tube 4, the liquid bin 5, the air channel 7 and the air bin 8 are throttled by the expansion valve 3, the gas-liquid separation can be realized, and the gas-liquid is respectively sent into the outer air tube 12 and the inner liquid tube 11, and meanwhile, the return liquid is sent back to the air bin 8 through the return liquid tube 16 for recirculation under the condition that the liquid is allowed to be carried by the gas collecting tube 13, so as to increase the utilization efficiency of the whole evaporation coil.
It should be noted that, for the present invention, any two components that are mutually communicated are communicated through a section of pipeline, as shown in fig. 1.
In order to more clearly understand the technical scheme of the evaporation coil with the efficient liquid separation function, the following description is made on the specific working process:
when refrigeration is needed, the stop valve 2 is opened, high-pressure refrigerant liquid flows into the expansion valve 3 from the liquid inlet pipe 1, is throttled by the expansion valve 3 and then is changed into low-temperature low-pressure gas-liquid two-phase fluid, then enters the buffer pipe 4, preliminary separation of the refrigerant liquid along the lower surface of the buffer pipe 4 and the refrigerant gas along the upper surface is realized, then the refrigerant liquid continuously enters the liquid bin 5, and the refrigerant gas enters the gas bin 8 through the air passage 7, at the moment, the liquid level meter in the liquid bin 5 can detect the liquid level condition of the refrigerant liquid and transmit a liquid level signal to the expansion valve 3 so as to control the opening degree of the expansion valve 3 (the higher the liquid level is, the smaller the opening degree is, and the lower the liquid level is, the larger the opening degree is conversely); liquid in the liquid bin 5 enters the inner-layer coil pipe 11 through the liquid separation pipe 9, gas in the gas bin 8 enters the outer-layer gas pipe 12 through the gas separation pipe 10, so that heat absorption of the refrigerant is realized, then the liquid is collected in the gas collection pipe 13 and enters the gas-liquid separator 15 through the gas return pipe 14, gas-liquid separation is carried out through the gas-liquid separator 15, the separated refrigerant liquid enters the gas bin 8 through the liquid return pipe 16, and the refrigerant gas is discharged outwards through the gas outlet pipe 17 (for example, discharged to a compressor of an external refrigeration system).
According to the technical scheme, on one hand, the liquid distribution uniformity is improved through the arrangement of the plurality of liquid distribution pipes 9, on the other hand, the liquid supply amount is increased, the liquid level of the liquid storage bin is increased, the outlet of the evaporation coil can be enabled to operate with liquid, the phase change heat exchange efficiency is far higher than that of the non-phase change heat exchange for the evaporator, and when the outlet of the evaporation coil is provided with liquid, the whole process inside the evaporator is in the phase change heat exchange stage, so that the performance of the evaporation coil is integrally improved.
In summary, compared with the prior art, the evaporation coil with the efficient liquid separation function provided by the invention can effectively separate gas and liquid of throttled gas-liquid two-phase fluid, solves the problem of uneven liquid separation, improves the heat exchange performance of the whole evaporation coil, is beneficial to wide application, and has great production and practical significance.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (5)

1. An evaporation coil with a high-efficiency liquid separation function is characterized by comprising a buffer tube (4);
the front end of the buffer tube (4) is communicated with a liquid inlet tube (1) through an expansion valve (3), a stop valve (2) in sequence;
the rear end of the buffer tube (4) is communicated with the front end of the liquid bin (5);
the rear end of the liquid bin (5) is communicated with the front end of the air bin (8) through an air passage (7);
the bottom of the liquid bin (5) is communicated with a plurality of liquid separating pipes (9);
the bottom of the air bin (8) is communicated with a plurality of air distribution pipes (10);
the upper part of the rear end of the gas bin (8) is communicated with a gas-liquid separator (15) through a liquid return pipe (16);
the gas-liquid separator (15) is communicated with an air outlet pipe (17);
each liquid separating pipe (9) is communicated with the upper end of one inner layer liquid pipe (11);
each gas distribution pipe (10) is communicated with the upper end of one outer layer gas pipe (12);
the lower ends of the inner liquid pipe (11) and the outer air pipe (12) are communicated with a gas collecting pipe (13);
the gas collecting pipe (13) is also communicated with the gas-liquid separator (15) through a gas return pipe (14);
a liquid level meter (6) is arranged in the liquid bin (5) and is used for measuring the liquid level of the refrigerant liquid in the liquid bin (5) in real time and then sending the liquid level to the expansion valve (3);
the expansion valve (3) is an electronic expansion valve;
the liquid level meter (6) is in signal connection with the expansion valve (3);
the expansion valve (3) is used for correspondingly controlling the opening degree of the expansion valve according to the liquid level fed back by the liquid level meter (6);
the bottom of the liquid bin (5) is provided with a plurality of liquid outlet holes, and each liquid outlet hole is welded with a liquid separating pipe (9);
the bottom of the air bin (8) is provided with a plurality of air outlet holes, and each air outlet hole is welded with an air distribution pipe (10).
2. An evaporation coil with efficient liquid separation function according to claim 1, characterized in that the liquid sump (5) is adapted to store low pressure refrigerant liquid.
3. An evaporation coil with efficient liquid separation function as claimed in claim 1, characterized in that the height of the bottom surface of the air channel (7) is higher than the height of the axial center line of the buffer tube (4).
4. An evaporation coil with efficient liquid separation function according to claim 1, characterized in that the liquid separation tube (9) is used for uniformly distributing the refrigerant liquid in the liquid bin (5) to the inner liquid tube (11) in the evaporation coil;
the gas distribution pipe (10) is used for uniformly distributing the gas-liquid mixed refrigerant in the gas bin (8) to the outer layer gas pipe (12) in the evaporation coil.
5. The evaporating coil with the efficient liquid separation function as claimed in claim 4, wherein the lengths and the pipe diameters of the liquid separation pipes (9) are kept consistent;
the lengths and the pipe diameters of the plurality of gas distribution pipes (10) are kept consistent.
CN201910078835.1A 2019-01-28 2019-01-28 Evaporation coil pipe with efficient liquid separation function Active CN109682119B (en)

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CN109682119B true CN109682119B (en) 2024-03-29

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110230901A (en) * 2019-05-27 2019-09-13 广州大学 A kind of the refrigerant distribution pipe and heat pump system of gas-liquid two-phase common type

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CN108709337A (en) * 2018-07-02 2018-10-26 天津商业大学 Cooling air formula evaporator with eddy flow bleed liquid-dividing head
CN209672647U (en) * 2019-01-28 2019-11-22 天津商业大学 A kind of evaporation coil of the efficient liquid separation function of band

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节流短管在大容量空调机组中的应用;李敏华;欧阳惕;;制冷与空调(04);第22-25页 *

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