CN112880244A - Two-phase flow air conditioning system with free cooling function - Google Patents
Two-phase flow air conditioning system with free cooling function Download PDFInfo
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- CN112880244A CN112880244A CN202110114577.5A CN202110114577A CN112880244A CN 112880244 A CN112880244 A CN 112880244A CN 202110114577 A CN202110114577 A CN 202110114577A CN 112880244 A CN112880244 A CN 112880244A
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- refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Air-Conditioning For Vehicles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a two-phase flow air conditioning system with free cooling, which comprises at least one compressor, a condenser, a throttling device, a low-pressure circulating barrel, a refrigerant circulating pump, at least one direct expansion flow regulating device, at least one direct expansion type evaporator and a plurality of control valves for switching operation conditions.
Description
Technical Field
The invention relates to a two-phase flow air conditioning system with free cooling, belonging to the technical field of refrigeration and air conditioning.
Background
With the compactness of the data center being improved more and more, the energy consumption of the traditional air-conditioning cooling system is also increased more and more, the cooling energy consumption of the data center gradually becomes an important expenditure of data center operators, and the reduction of the cooling energy consumption of the data center is an important mark for measuring the management level of the data center.
In order to ensure the safe and reliable operation of the compressor, the conventional data center mainly adopts a secondary cooling heat exchange method that pure water or ethylene glycol aqueous solution is used as secondary refrigerant, cold water is conveyed to an inter-machine air conditioner of the data center through a chilled water pump, heat generated inside the data center is transferred to the cold water in the form of air cooling or heat pipes, and the cold water is heated and then returns to a water cooler to be cooled to form a heat transfer cycle.
As pure water or glycol water solution is adopted as the secondary refrigerant, although the specific heat capacity of water is higher, the heat-carrying form of the water is still sensible heat-carrying, the heat-carrying capacity is poor, the temperature of the secondary refrigerant rises after heat absorption, the heat exchange temperature difference is reduced, the circulation quantity of the secondary refrigerant is large, and the power consumption of a circulating pump of the secondary refrigerant is also large.
In addition, a refrigeration system for heat exchange in a direct expansion mode is applied to the data center, flow control is often required to be performed in an evaporator outlet superheat degree mode in order to prevent liquid return of a compressor, sensible heat exchange is often the main at the tail end of an evaporator, the heat exchanger is extremely low in heat exchange coefficient at the moment, and the heat exchanger area utilization efficiency is very low.
And when the ambient temperature is lower, the condensation temperature of the refrigeration cycle is possibly lower than the evaporation temperature, the active refrigeration cycle cannot run safely, the traditional free cooling system is difficult to switch, the requirement on starting temperature difference is high, and therefore the free cooling utilization rate is lower.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a refrigeration system with free cooling by combining the characteristic of long annual working time of a data center.
The purpose of the invention is realized by the following technical scheme:
a two-phase flow air conditioning system with free cooling comprises at least one compressor, a condenser, a throttling device, a low-pressure circulating barrel, a refrigerant circulating pump, a flow regulating device, at least one evaporator and a plurality of refrigerant control valves for switching operation conditions; the refrigerant circulation passage is changed by changing the opening and closing state of the refrigerant control valve so as to switch the air conditioning system between two operation modes of active cooling and free cooling:
in the active cooling mode:
forming a refrigeration cycle that a refrigerant flows through a condenser, a throttling device, a low-pressure circulating barrel, a refrigerant circulating pump, a flow regulating device, an evaporator and the low-pressure circulating barrel from a compressor in sequence and then returns to the compressor;
in the free-cooling mode:
and forming a refrigeration cycle in which the refrigerant flows from the evaporator, through the condenser, the refrigerant circulating pump and the refrigerant control valve in sequence and then returns to the evaporator.
Preferably, the two-phase flow air conditioning system with free cooling of the present invention, the compressor is an oil-free compressor.
Preferably, the two-phase flow air conditioning system with free cooling of the invention, the condenser is an evaporative condenser.
Preferably, the refrigerant circulating pump is a positive displacement liquid pump.
Preferably, the two-phase flow air conditioning system with free cooling of the invention, the refrigerant circulating pump is a centrifugal liquid pump.
Preferably, the refrigerant of the two-phase flow air conditioning system with free cooling of the invention is R134 a.
Preferably, in the air conditioning system with free cooling two-phase flow, the liquid outlet end of the condenser is further provided with a liquid storage barrel, and the refrigerant flowing out of the condenser flows into the liquid storage barrel firstly and then flows into the low-pressure circulation barrel or the refrigerant circulation pump.
Preferably, in the air conditioning system with free cooling two-phase flow, the refrigerant control valves are all solenoid valves or electric valves and are controlled by the electric control system to be opened or closed.
The characteristics and the progress of the technical scheme of the application are mainly reflected in that:
the utility model provides a refrigerating system with free cooling, carry out gas-liquid separation through low pressure circulation bucket to the evaporimeter return air, the refrigerant liquid of not phase transition passes through the liquid pump pressurization, overcome pipeline resistance and get into the further heat transfer evaporation of evaporimeter, through this design, can be through the flow of adjusting the refrigerant in the evaporimeter, the refrigerant still remains partly liquid in the evaporimeter exit, the proportion of situation adjustment liquid according to actual operation, refrigerant boiling heat transfer area in the increase evaporimeter in the at utmost, reduce the heat transfer difference in temperature, the operating efficiency of system is improved.
Drawings
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
fig. 1 is a flowchart of the direct cooling mode of the refrigeration system of embodiment 1;
fig. 2 is a flow chart of the free-cooling mode of the refrigeration system of embodiment 1;
fig. 3 is a flowchart of the direct cooling mode of the refrigeration system with an accumulator of embodiment 2;
fig. 4 is a flow chart of the free cooling mode of the refrigeration system with accumulator of embodiment 2.
Wherein:
1, a compressor;
2, a condenser;
3 a throttling device;
4, a low-pressure circulating barrel;
5 a first valve;
6 a second valve;
7 a refrigerant circulating pump;
8 a flow regulating device;
9 an evaporator;
10 a third valve;
11 a second inlet;
12 a second outlet;
13 a first inlet;
14 a first outlet;
15 a fourth valve;
16 liquid storage barrels.
Detailed Description
Example 1
The embodiment provides a two-phase flow air conditioning system with free cooling, which comprises:
a compressor 1, a condenser 2, a throttling device 3, a low-pressure circulating barrel 4, a refrigerant circulating pump 7, at least one flow regulating device 8, at least one evaporator 9, and four refrigerant control valves (a first valve 5, a second valve 6, a third valve 10, a fourth valve 15, the refrigerant control valves can be selected from electromagnetic valves or electric valves) for switching operation conditions, wherein the refrigerant circulation path is changed by changing the opening and closing states of the refrigerant control valves so as to switch the air conditioning system between an active cooling operation mode and a free cooling operation mode:
the first valve 5, the second valve 6, the third valve 10 and the fourth valve 15 are preferably solenoid valves which can be opened or closed under the control of an electric control system; the refrigerant flow passage is changed by changing the opening and closing state of the refrigerant control valve so as to switch the air conditioning system between an active cooling operation mode and a free cooling operation mode;
in the active cooling mode, as shown in fig. 1:
closing the second valve 6 and the third valve 10; opening the first valve 5 and the fourth valve 15;
forming a refrigeration cycle of the compressor 1, the condenser 2, the throttling device 3, the low-pressure circulating barrel 4, the refrigerant circulating pump 7, the flow regulating device 8, the evaporator 9, the low-pressure circulating barrel 4 and the compressor 1;
specifically, the condensing agent enters the compressor 1 from the inlet of the compressor, is compressed into high-temperature and high-pressure gas, enters the condenser 2 through the outlet of the compressor and a connecting pipeline, is cooled into high-pressure and medium-temperature liquid in the condenser 2, is discharged from the outlet of the condenser 2, is depressurized and cooled at the throttling device 3 through a connecting pipe to form a low-temperature and low-pressure gas-liquid mixed state, enters the low-pressure circulating barrel 4 from the first inlet 13, and is separated in the low-pressure circulating barrel 4, wherein the liquid-state refrigerant flows out through the first outlet 14 of the low-pressure circulating barrel 4, passes through the refrigerant control valve 5, enters the refrigerant circulating pump 7, is pressurized through the refrigerant circulating pump 7, enters the flow regulating device 8 to regulate the flow, then enters the evaporator 9 to exchange heat, enters the low-pressure circulating barrel 4 from the second inlet 11 to perform gas-liquid separation after the heat exchange through the fourth valve, the gas enters the compressor through the second outlet 12 of the low-pressure circulating barrel 4 through a connecting pipeline to form a refrigeration cycle.
In the free cooling mode, as shown in fig. 2:
the compressor 1 stops running, the second valve 6 and the third valve 10 are opened, the first valve 5 and the fourth valve 15 are closed, and the throttling device 3 is closed;
a refrigeration cycle of an evaporator 9, a condenser 2, a refrigerant circulating pump 7, a flow regulating device 8 and the evaporator 9 is formed;
specifically, after absorbing heat in the evaporator 9, the refrigerant enters the condenser 2 through the connecting pipeline, is cooled in the condenser 2 to become medium-temperature liquid, is discharged from an outlet of the condenser, passes through the second valve 6 through the connecting pipe, enters the refrigerant circulating pump 7, is boosted through the refrigerant circulating pump 7, enters the flow regulating device 8 to regulate the flow, and then enters the evaporator 9 to exchange heat, so as to form a refrigeration cycle.
As a specific alternative embodiment, the compressor is an oil-free compressor.
As a specific alternative, the condenser 2 is an evaporative condenser.
Preferably, the refrigerant circulation pump 7 is a positive displacement liquid pump or a centrifugal liquid pump.
Preferably, the refrigerant is a variety of common refrigerants such as R134 a.
Example 2
The embodiment provides a two-phase flow air conditioning system with free cooling, which comprises:
the air-conditioning system comprises a compressor 1, a condenser 2, a throttling device 3, a low-pressure circulating barrel 4, a refrigerant circulating pump 7, at least one flow regulating device 8, at least one evaporator 9, at least one liquid storage barrel 16, and four refrigerant control valves (a first valve 5, a second valve 6, a third valve 10 and a fourth valve 15 respectively) for switching the operation conditions, wherein the refrigerant circulation passage is changed by changing the opening and closing states of the refrigerant control valves so as to switch the air-conditioning system between an active cooling operation mode and a free cooling operation mode:
the first valve 5, the second valve 6, the third valve 10 and the fourth valve 15 are preferably solenoid valves which can be opened or closed under the control of an electric control system; the refrigerant flow passage is changed by changing the opening and closing state of the refrigerant control valve so as to switch the air conditioning system between an active cooling operation mode and a free cooling operation mode;
in the active cooling mode, as shown in fig. 3:
closing the second valve 6 and the third valve 10; opening the first valve 5 and the fourth valve 15;
the refrigeration cycle of the compressor 1, the condenser 2, the liquid storage barrel 16, the throttling device 3, the low-pressure circulating barrel 4, the refrigerant circulating pump 7, the flow regulating device 8, the evaporator 9, the low-pressure circulating barrel 4 and the compressor 1 is formed;
specifically, the condensing agent enters the compressor 1 from the inlet of the compressor, is compressed into high-temperature and high-pressure gas, enters the condenser 2 through the outlet of the compressor and a connecting pipeline, is cooled into high-pressure and medium-temperature liquid in the condenser 2, is discharged from the outlet of the condenser 2, enters the liquid storage barrel 16 from the first inlet 13, is discharged from the first outlet 14 of the liquid storage barrel 16, is subjected to pressure reduction and temperature reduction at the throttling device 3 through a connecting pipe to form a low-temperature and low-pressure gas-liquid mixed state, enters the low-pressure circulating barrel 4 from the second inlet 11, is separated in the low-pressure circulating barrel 4, wherein the liquid-state refrigerant flows out through the second outlet 12 of the low-pressure circulating barrel 4, passes through the refrigerant control valve 5, enters the refrigerant circulating pump 7, is subjected to pressure increase through the refrigerant circulating pump 7, enters the flow regulating device 8 to regulate the flow rate, and then enters the evaporator 9, the refrigerant after heat exchange enters the low-pressure circulating barrel 4 through the fourth valve 15 for gas-liquid separation, and the gas flows out through the second outlet 12 of the low-pressure circulating barrel 4 and enters the compressor 1 through the connecting pipeline to form a refrigeration cycle.
In the free-cooling mode, as shown in fig. 4:
the compressor 1 stops running, the second valve 6 and the third valve 10 are opened, the first valve 5 and the fourth valve 15 are closed, and the throttling device 3 is closed;
a refrigeration cycle of the evaporator 9, the condenser 2, the liquid storage barrel 16, the refrigerant circulating pump 7, the flow regulating device 8 and the evaporator 9 is formed;
specifically, after absorbing heat in the evaporator 9, the condensing agent enters the condenser 2 through the connecting pipeline, is cooled to be medium-temperature liquid in the condenser 2, is discharged from the outlet of the condenser and enters the liquid storage barrel 16, the liquid storage barrel 16 passes through the second valve 6 through the connecting pipe and then enters the refrigerant circulating pump 7, after the pressure of the refrigerant circulating pump 7 is increased, the refrigerant enters the flow regulating device 8 to regulate the flow rate, and then enters the evaporator 9 to exchange heat, so that the refrigeration cycle is formed.
It is to be understood that: the foregoing is only a preferred embodiment of the present invention, and the solutions presented herein are examples for persons of ordinary skill in the art to understand, and it will be apparent to those of ordinary skill in the art that several modifications and adaptations can be made without departing from the principle of the present invention, and these modifications and adaptations should be considered as the scope of the present invention.
Claims (8)
1. A two-phase flow air conditioning system with free cooling is characterized by comprising at least one compressor (1), a condenser (2), a throttling device (3), a low-pressure circulating barrel (4), a refrigerant circulating pump (7), a flow regulating device (8), at least one evaporator (9) and a plurality of refrigerant control valves for switching the operation conditions; the refrigerant circulation passage is changed by changing the opening and closing state of the refrigerant control valve so as to switch the air conditioning system between two operation modes of active cooling and free cooling:
in the active cooling mode:
the refrigeration cycle that the refrigerant flows through the condenser (2), the throttling device (3), the low-pressure circulating barrel (4), the refrigerant circulating pump (7), the flow regulating device (8), the evaporator (9) and the low-pressure circulating barrel (4) from the compressor (1) and then returns to the compressor (1) is formed;
in the free-cooling mode:
the refrigerant flows from the evaporator (9) through the condenser (2), the refrigerant circulating pump (7) and the flow adjusting device (8) in sequence and then returns to the refrigeration cycle of the evaporator (9).
2. The two-phase flow air conditioning system with free cooling of claim 1, wherein the compressor is an oil-free compressor.
3. The two-phase flow air conditioning system with free cooling according to claim 1, wherein the condenser (2) is an evaporative condenser.
4. The two-phase flow air conditioning system with free cooling according to claim 1, characterized in that the refrigerant circulation pump (7) is a positive displacement liquid pump.
5. The two-phase flow air conditioning system with free cooling according to claim 1, characterized in that the refrigerant circulation pump (7) is a centrifugal liquid pump.
6. The two-phase flow air conditioning system with free cooling of claim 1, wherein the refrigerant is R134 a.
7. The two-phase flow air conditioning system with free cooling according to any one of claims 1 to 6, wherein a liquid outlet end of the condenser (2) is further provided with a liquid storage barrel (16), and the refrigerant flowing out of the condenser (2) flows into the liquid storage barrel (16) firstly and then flows into the low-pressure circulation barrel (4) or the refrigerant circulation pump (7).
8. The two-phase flow air conditioning system with free cooling of any one of claims 1 to 7, wherein the refrigerant control valves are all solenoid valves or electric valves and are controlled by an electric control system to open or close.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110114577.5A CN112880244A (en) | 2021-01-27 | 2021-01-27 | Two-phase flow air conditioning system with free cooling function |
| PCT/CN2021/074677 WO2022160339A1 (en) | 2021-01-27 | 2021-02-01 | Two-phase flow air conditioning system with free cooling function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110114577.5A CN112880244A (en) | 2021-01-27 | 2021-01-27 | Two-phase flow air conditioning system with free cooling function |
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| CN112880244A true CN112880244A (en) | 2021-06-01 |
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| CN202110114577.5A Pending CN112880244A (en) | 2021-01-27 | 2021-01-27 | Two-phase flow air conditioning system with free cooling function |
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| Country | Link |
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| CN (1) | CN112880244A (en) |
| WO (1) | WO2022160339A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116147217B (en) * | 2023-04-03 | 2024-03-12 | 西安交通大学 | Ejector-liquid pump compound synergistic refrigeration cycle system for cooling data center |
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| JPH0794926B2 (en) * | 1989-02-23 | 1995-10-11 | 三機工業株式会社 | Refrigerating device for both low temperature medium and high temperature medium |
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2021
- 2021-01-27 CN CN202110114577.5A patent/CN112880244A/en active Pending
- 2021-02-01 WO PCT/CN2021/074677 patent/WO2022160339A1/en active Application Filing
Patent Citations (6)
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| CN101694311A (en) * | 2009-10-23 | 2010-04-14 | 清华大学 | Multi-connected air conditioning unit with natural cooling function and liquid supplied by liquid pump |
| CN102278840A (en) * | 2011-06-25 | 2011-12-14 | 广东美的电器股份有限公司 | Air conditioner for machine room |
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| WO2022160339A1 (en) | 2022-08-04 |
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Address after: 215000 No.158 Jinshajiang Road, high tech Zone, Suzhou City, Jiangsu Province Applicant after: Bixin energy technology (Suzhou) Co.,Ltd. Address before: 215000 No.158 Jinshajiang Road, high tech Zone, Suzhou City, Jiangsu Province Applicant before: SUZHOU BSE AIR CONDITIONER Co.,Ltd. |
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Application publication date: 20210601 |