CN112815390A - Multi-split air conditioning system - Google Patents

Multi-split air conditioning system Download PDF

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Publication number
CN112815390A
CN112815390A CN202110056479.0A CN202110056479A CN112815390A CN 112815390 A CN112815390 A CN 112815390A CN 202110056479 A CN202110056479 A CN 202110056479A CN 112815390 A CN112815390 A CN 112815390A
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CN
China
Prior art keywords
expansion valve
pipeline
heat exchanger
fresh air
output end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110056479.0A
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Chinese (zh)
Inventor
王作林
邱韦淇
倪加成
梁斌
曲志光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Tengyuan Design Institute Co Ltd
Original Assignee
Qingdao Tengyuan Design Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Tengyuan Design Institute Co Ltd filed Critical Qingdao Tengyuan Design Institute Co Ltd
Priority to CN202110056479.0A priority Critical patent/CN112815390A/en
Publication of CN112815390A publication Critical patent/CN112815390A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F24F1/32—Refrigerant piping for connecting the separate outdoor units to indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention relates to the technical field of air conditioning systems, in particular to a multi-split air conditioning system which comprises an outdoor unit, an indoor unit and a fresh air machine, wherein the outdoor unit is integrated with a compressor and a condenser, the compressor is designed with double suction inlets, and the outdoor unit is provided with a first suction inlet, a second suction inlet and an exhaust port; the first suction inlet is communicated with a low-pressure cavity of the compressor, and the second suction inlet is communicated with a medium-pressure cavity of the compressor; the air outlet is connected with the condenser, the indoor unit is connected with the first suction inlet of the compressor, the fresh air fan is connected with the second suction inlet of the outdoor unit, and the air outlet is respectively connected with the expansion valves of the indoor unit and the fresh air fan; the method is beneficial to improving the operation energy efficiency of the multi-split air-conditioning system, so that the energy conservation of the multi-split air-conditioning system is improved.

Description

Multi-split air conditioning system
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to a multi-split air conditioning system.
Background
With the development of economy and society and the improvement of living standard of people, people have higher and higher requirements on the comfort in buildings. In the building indoor environment construction process, not only indoor air needs to be heated or cooled to meet indoor temperature requirements, but also fresh air needs to be conveyed to the interior of the building so as to meet the requirement of human bodies on air freshness. The multi-split air conditioning system is widely popularized and applied due to simple installation and flexible use.
In the use process of the multi-split air and fresh air system, although the indoor unit processes indoor air and the fresh air (outdoor air) is processed by the fresh air machine, and the temperature working conditions of the indoor air and the fresh air are completely different, in the multi-split air and fresh air system, the multi-split outdoor unit provides refrigerants with the same parameters to the multi-split indoor unit and the fresh air machine at present, the evaporating pressures of the refrigerants in the heat exchangers of the multi-split indoor unit and the fresh air machine are close, and the processing mode is simple but not energy-saving. Because the temperature working condition of the fresh air is generally worse than the indoor temperature working condition, the fresh air can be processed to the isenthalpic state point of the indoor air by using the high-temperature cold source (the outdoor unit can provide two refrigerants with different working conditions to process the indoor air and the fresh air respectively, the evaporation pressure of the refrigerant entering the indoor unit is lower, but the evaporation pressure of the refrigerant entering the fresh air fan is improved, so that the operation energy efficiency of the whole refrigerating system can be improved. The other mode is that two sets of multi-connected outdoor units are arranged, one set of multi-connected outdoor units is used for specially treating indoor air, and the other set of multi-connected outdoor units is used for specially treating fresh air, so that the evaporation temperature of the set of air conditioner host machine for treating the fresh air can be increased, and the energy conservation in operation is realized. However, this method has a high initial cost and a complicated system.
Disclosure of Invention
The invention aims to provide a multi-split air conditioning system, which is used for solving the problems of complex structure and poor energy-saving performance of the conventional multi-split air conditioning system.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-split air conditioning system comprises an outdoor unit, an indoor unit, a fresh air fan and a pipeline, wherein the outdoor unit is integrated with a compressor and a condenser, the compressor is provided with a low-pressure cavity, a medium-pressure cavity and a high-pressure cavity, and the output end of the high-pressure cavity is connected with the input end of the condenser through the pipeline;
the indoor unit is integrated with a first heat exchanger and a first expansion valve, the output end of the first heat exchanger is connected with the input end of the low-pressure cavity through a pipeline, the input end of the first heat exchanger is connected with the output end of the first expansion valve through a pipeline, and the input end of the first expansion valve is connected with the output end of the condenser through a pipeline;
the fresh air machine is integrated with a second heat exchanger and a second expansion valve, the output end of the second heat exchanger is connected with the input end of the medium-pressure cavity through a pipeline, the input end of the second heat exchanger is connected with the output end of the second expansion valve through a pipeline, and the input end of the second expansion valve is connected with the output end of the condenser through a pipeline;
and a refrigerant is arranged in the inner cavity of the pipeline.
Preferably, the pipeline is a copper pipe.
Preferably, an opening degree of the first expansion valve is smaller than an opening degree of the second expansion valve.
Preferably, the outdoor unit is provided with an exhaust port, a first suction port and a second suction port, an inner end of the exhaust port is connected with an output end of the condenser, an outer end of the exhaust port is connected with input ends of the first expansion valve and the second expansion valve respectively, an inner end of the first suction port is connected with an input end of the low-pressure chamber, an outer end of the first suction port is connected with an output end of the first heat exchanger, an inner end of the second suction port is connected with an input end of the medium-pressure chamber, and an outer end of the second suction port is connected with an output end of the second heat exchanger.
Preferably, the indoor unit and the fresh air fan are respectively provided with a plurality of air inlets.
Compared with the prior art, the invention has the beneficial effects that:
1. the multi-split air conditioning system can realize that the indoor unit and the fresh air fan can both normally process air with different temperature working conditions (the indoor unit processes indoor air, and the fresh air fan processes fresh air), and can improve the performance coefficient of the whole refrigerating system and save power consumption on the premise of realizing normal functions. In the cold load of a building, the fresh air load ratio is very high, about 30 to 50 percent, and the energy consumption for processing the fresh air is reduced, so that the energy-saving significance is achieved; the refrigeration performance coefficient is improved by about 3 percent when the evaporation temperature is improved by 1 ℃; the air conditioning system can obviously increase the evaporation temperature of the refrigerant in the fresh air machine, so that the increase of the evaporation temperature of the refrigerant in the fresh air machine from about 5 ℃ to 20 ℃ is possible, and huge energy-saving potential is brought.
2. The air conditioning system has simple and integrated structure, and avoids arranging a plurality of outdoor units, thereby reducing the input cost.
Drawings
FIG. 1 is a schematic structural view of the present invention as a whole;
FIG. 2 is a schematic diagram of the energy saving mechanism of the present invention.
In the figure: 100-an outdoor unit; 200-a compressor; 2001-first suction port; 2002-a second suction inlet; 2003-an exhaust port; 201-low pressure chamber; 202-a medium pressure chamber; 203-high pressure chamber; 300-a condenser; 400-an indoor unit; 401 — a first heat exchanger; 402-a first expansion valve; 500-fresh air machine; 501-a second heat exchanger; 502-a second expansion valve; 600-pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, the present invention provides a technical solution, a multi-split air conditioning system, including an outdoor unit 100, an indoor unit 400, a fresh air blower 500, and a pipeline 600, wherein the outdoor unit 100 is integrated with a compressor 200 and a condenser 300, the compressor 200 is provided with a low pressure chamber 201, a medium pressure chamber 202, and a high pressure chamber 203, and an output end of the high pressure chamber 203 is connected with an input end of the condenser 300 through the pipeline 600;
the indoor unit 400 is integrated with a first heat exchanger 401 and a first expansion valve 402, an output end of the first heat exchanger 401 is connected with an input end of the low pressure chamber 201 through a pipeline 600, an input end of the first heat exchanger 401 is connected with an output end of the first expansion valve 402 through a pipeline 600, and an input end of the first expansion valve 402 is connected with an output end of the condenser 300 through a pipeline 600;
the fresh air fan 500 is integrated with a second heat exchanger 501 and a second expansion valve 502, the output end of the second heat exchanger 501 is connected with the input end of the medium pressure cavity 202 through a pipeline 600, the input end of the second heat exchanger 501 is connected with the output end of the second expansion valve 502 through a pipeline 600, and the input end of the second expansion valve 502 is connected with the output end of the condenser 300 through a pipeline 600;
the inner cavity of the pipeline 600 is provided with refrigerant.
In this embodiment, the pipeline 600 is a copper pipe.
In this embodiment, the opening degree of the first expansion valve 402 is smaller than the opening degree of the second expansion valve 502.
In this embodiment, the outdoor unit 100 is provided with an exhaust port 2003, a first suction port 2001 and a second suction port 2002, the inner end of the exhaust port 2003 is connected to the output end of the condenser 300, the outer end of the exhaust port 2003 is connected to the input ends of the first expansion valve 402 and the second expansion valve 502, the inner end of the first suction port 2001 is connected to the input end of the low pressure chamber 201, the outer end of the first suction port 2001 is connected to the output end of the first heat exchanger 401, the inner end of the second suction port 2002 is connected to the input end of the medium pressure chamber 202, and the outer end of the second suction port 2002 is connected to the output end of the second heat exchanger.
In summary, the refrigerant liquid flowing out of the exhaust port 2003 of the outdoor unit 100, i.e., the output end of the condenser 300, is at a high temperature and a high pressure, and the refrigerant liquid respectively enters the indoor unit 400 and the new fan 500 through the pipeline 600; one path of refrigerant is throttled by a first expansion valve 402 inside the indoor unit 400 to become low-temperature and low-pressure refrigerant liquid, and then enters a first heat exchanger 401 of the indoor unit 400, and the refrigerant liquid absorbs heat of indoor air and then becomes low-temperature and low-pressure refrigerant gas, and then returns to a first suction port 2001 of the outdoor unit 100 through a pipeline 600 (the first suction port 2001 of the outdoor unit 100 is connected with a low-pressure cavity 201 of the compressor 200); one path of refrigerant entering the fresh air machine 500 is throttled by a second expansion valve 502 of the fresh air machine 500 and then is changed into medium-temperature and medium-pressure refrigerant liquid, and then enters a second heat exchanger 501 of the fresh air machine 500 to absorb the heat of fresh air and then is changed into medium-temperature and medium-pressure refrigerant gas; this medium temperature and pressure refrigerant gas is returned to the second suction port 2002 of the outdoor unit 100 through the pipe 600 (the second suction port 2002 is connected to the medium pressure chamber 202 of the compressor 200).
The low-temperature and low-pressure gas from the indoor unit 400 inside the compressor 200 is compressed into a medium-temperature and medium-pressure refrigerant gas in the low-pressure chamber 201, and then enters the medium-pressure chamber 202 of the compressor 200; after being mixed with the refrigerant gas from the fresh air fan 500, the refrigerant gas is continuously compressed into high-temperature and high-pressure refrigerant gas, is discharged out of the compressor 200 from the high-pressure cavity 203, enters the condenser 300 of the outdoor unit 100 to be condensed and released, and is changed into high-temperature and high-pressure refrigerant liquid; the refrigerant liquid is sent to the indoor unit 400 and the fresh air fan 500 through the outlet 2003 of the outdoor unit 100; thus, the process is continuously circulated.
The energy-saving mechanism is as follows: as shown in the pressure-enthalpy diagram of the refrigeration cycle in fig. 2, during the refrigeration cycle, the evaporation temperature is increased under the condition that other conditions are not changed, which is beneficial to improving the operation energy efficiency of the system. Because the temperature working conditions of the air processed by the indoor unit 400 and the fresh air fan 500 are different (the indoor air processed by the indoor unit 400 is about 25 ℃, the outdoor air processed by the fresh air fan 500 is much worse than the indoor air, and sometimes the outdoor temperature reaches 35 ℃ or even 40 ℃), the indoor air can be processed by the low-temperature refrigerant, and the fresh air can be processed by the medium-temperature refrigerant. Thus, although the evaporation temperature of the refrigerant for processing the indoor air part is unchanged, the evaporation temperature of the refrigerant for processing fresh air can be greatly increased. The whole operation efficiency is improved. Wherein the process is described as: the high-temperature high-pressure refrigerant gas (state 5) discharged by the compressor 200 is condensed and releases heat in the condenser 300 and is changed from state 5 to state 6 (low-temperature high-pressure liquid), then the refrigerant gas is divided into two paths, one path of the refrigerant gas is throttled to state 8 (low-temperature low-pressure liquid) through the first expansion valve 402, the other path of the refrigerant gas is throttled to state 7 (low-temperature medium-pressure liquid) through the second expansion valve 502, the two paths of the refrigerant gas respectively enter the suction inlet of the compressor 200 after the first heat exchanger 401 absorbs indoor air heat and the fresh air heat absorbed by the second heat exchanger 501, the two paths of the refrigerant gas respectively enter the suction inlet of the compressor 200, the refrigerant gas (state 1) output by the first heat exchanger 401 enters the first suction inlet of the compressor 200, then the refrigerant gas is compressed to state 2, and the refrigerant (state.
Example two:
referring to fig. 1, on the basis of the first embodiment, a plurality of indoor units 400 and a plurality of fresh air fans 500 are respectively arranged, so that one outdoor unit 100 can simultaneously meet the operation requirements of a plurality of indoor units 400 and fresh air fans 500.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A multi-split air conditioning system, comprising:
an outdoor unit (100);
an indoor unit (400);
fresh air machine (500) and
the outdoor unit (100) is integrated with a compressor (200) and a condenser (300), the compressor (200) is provided with a low-pressure cavity (201), a medium-pressure cavity (202) and a high-pressure cavity (203), and the output end of the high-pressure cavity (203) is connected with the input end of the condenser (300) through a pipeline (600);
the indoor unit (400) is integrated with a first heat exchanger (401) and a first expansion valve (402), the output end of the first heat exchanger (401) is connected with the input end of the low-pressure cavity (201) through a pipeline (600), the input end of the first heat exchanger (401) is connected with the output end of the first expansion valve (402) through a pipeline (600), and the input end of the first expansion valve (402) is connected with the output end of the condenser (300) through a pipeline (600);
the fresh air fan (500) is integrated with a second heat exchanger (501) and a second expansion valve (502), the output end of the second heat exchanger (501) is connected with the input end of the medium-pressure cavity (202) through a pipeline (600), the input end of the second heat exchanger (501) is connected with the output end of the second expansion valve (502) through a pipeline (600), and the input end of the second expansion valve (502) is connected with the output end of the condenser (300) through a pipeline (600);
the inner cavity of the pipeline (600) is provided with a refrigerant.
2. A multi-split air conditioning system as recited in claim 1, wherein: the pipeline (600) is a copper pipe.
3. A multi-split air conditioning system as recited in claim 1, wherein: the opening degree of the first expansion valve (402) is smaller than the opening degree of the second expansion valve (502).
4. A multi-split air conditioning system as recited in claim 1, wherein: the outdoor unit (100) is provided with an exhaust port (2003), a first suction port (2001) and a second suction port (2002), wherein the inner end of the exhaust port (2003) is connected with the output end of the condenser (300), the outer end of the exhaust port (2003) is respectively connected with the input ends of the first expansion valve (402) and the second expansion valve (502), the inner end of the first suction port (2001) is connected with the input end of the low-pressure chamber (201), the outer end of the first suction port (2001) is connected with the output end of the first heat exchanger (401), the inner end of the second suction port (2002) is connected with the input end of the medium-pressure chamber (202), and the outer end of the second suction port (2002) is connected with the output end of the second heat exchanger (501).
5. A multi-split air conditioning system as claimed in any one of claims 1 to 4, wherein: the indoor unit (400) and the fresh air fan (500) are respectively provided with a plurality of air inlets.
CN202110056479.0A 2021-01-15 2021-01-15 Multi-split air conditioning system Pending CN112815390A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110056479.0A CN112815390A (en) 2021-01-15 2021-01-15 Multi-split air conditioning system

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Application Number Priority Date Filing Date Title
CN202110056479.0A CN112815390A (en) 2021-01-15 2021-01-15 Multi-split air conditioning system

Publications (1)

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CN112815390A true CN112815390A (en) 2021-05-18

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205980121U (en) * 2016-08-22 2017-02-22 上海日立电器有限公司 One drags two fresh air conditioning unit systems
CN206488406U (en) * 2017-02-16 2017-09-12 南京天加空调设备有限公司 A kind of air-conditioner set of pair of evaporating temperature
CN209557183U (en) * 2018-09-12 2019-10-29 珠海格力电器股份有限公司 Compressor, air conditioning system and fresh air system
CN111306674A (en) * 2020-03-06 2020-06-19 中国中建设计集团有限公司 Independent temperature and humidity control system and method for recycling condensation waste heat
CN214094703U (en) * 2021-01-15 2021-08-31 青岛腾远设计事务所有限公司 Multi-split air conditioning system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205980121U (en) * 2016-08-22 2017-02-22 上海日立电器有限公司 One drags two fresh air conditioning unit systems
CN206488406U (en) * 2017-02-16 2017-09-12 南京天加空调设备有限公司 A kind of air-conditioner set of pair of evaporating temperature
CN209557183U (en) * 2018-09-12 2019-10-29 珠海格力电器股份有限公司 Compressor, air conditioning system and fresh air system
CN111306674A (en) * 2020-03-06 2020-06-19 中国中建设计集团有限公司 Independent temperature and humidity control system and method for recycling condensation waste heat
CN214094703U (en) * 2021-01-15 2021-08-31 青岛腾远设计事务所有限公司 Multi-split air conditioning system

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Application publication date: 20210518

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