CN110940014A - Energy-saving air conditioner water system - Google Patents

Energy-saving air conditioner water system Download PDF

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Publication number
CN110940014A
CN110940014A CN201911320705.0A CN201911320705A CN110940014A CN 110940014 A CN110940014 A CN 110940014A CN 201911320705 A CN201911320705 A CN 201911320705A CN 110940014 A CN110940014 A CN 110940014A
Authority
CN
China
Prior art keywords
water
cooling
way valve
energy
heat exchanger
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.)
Withdrawn
Application number
CN201911320705.0A
Other languages
Chinese (zh)
Inventor
李宏波
周伟
高琳
陈旭峰
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.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
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 Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201911320705.0A priority Critical patent/CN110940014A/en
Publication of CN110940014A publication Critical patent/CN110940014A/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-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
    • F24F5/0003Exclusively-fluid systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30Arrangement or mounting of heat-exchangers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-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
    • F24F5/0007Air-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
    • F24F5/001Compression cycle type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/20Heat-exchange fluid temperature

Abstract

The invention discloses an energy-saving air conditioning water system which comprises a water chilling unit, wherein chilled water inlets and chilled water outlets of the water chilling unit are communicated through a first three-way valve, cooling water inlets and cooling water outlets are communicated through a second three-way valve, the energy-saving air conditioning water system also comprises an intermediate heat exchanger arranged between a chilled water return pipeline and a cooling water return pipeline, a water outlet of the intermediate heat exchanger is communicated with the chilled water return pipeline through a third three-way valve on one side of chilled water, and a water inlet of the intermediate heat exchanger is communicated with the cooling water return pipeline through a fourth three-way valve on one side of cooling water. The invention can save energy and reduce equipment cost under the condition of ensuring that the process equipment is maintained at the required temperature.

Description

Energy-saving air conditioner water system
Technical Field
The invention relates to the technical field of refrigeration, in particular to an energy-saving air conditioning water system.
Background
In the industrial field, cooling water systems are often used to cool process equipment in order to meet the needs of the process. Generally, the water temperature is required to be maintained at a constant value or within a small range throughout the year, and certain requirements are made on the water temperature and the stability of water quality. The water chilling unit is usually used for providing cooling water, and the water chilling unit of the cooling water system in the traditional process is started all the year round, so that the operation energy consumption and the operation cost are high. However, in winter, the outdoor temperature is low, and if an external natural cold source is directly used for cooling, the electric power resource can be saved as much as possible, so that the method has important practical significance for current global energy conservation and emission reduction, resource conservation and energy conservation.
The process equipment and the main machine disclosed by the Chinese patent CN 202757224U respectively use two sets of cooling towers, and the water of the open type cooling tower directly enters the equipment, so that the equipment cost is increased, and the water quality is difficult to ensure. The technical scheme disclosed by the Chinese patent CN 101424472B only has two modes of summer and winter, cooling tower equipment is not used for cooling the refrigeration host machine in summer, an air cooling host machine is used, the efficiency is lower than that of a water cooling host machine, the energy efficiency of the system is not high, and equipment waste is also caused.
In summary, how to save energy and reduce cost under the condition of ensuring that the process equipment is maintained at the required temperature is an urgent technical problem to be solved in the industry.
Disclosure of Invention
The invention provides an energy-saving air conditioning water system, which aims to solve the problems of high energy consumption and high cost in the prior art.
The technical scheme adopted by the invention is that the energy-saving air conditioning water system comprises a water chilling unit, wherein chilled water inlets and chilled water outlets of the water chilling unit are communicated through a first three-way valve, cooling water inlets and cooling water outlets are communicated through a second three-way valve, the energy-saving air conditioning water system also comprises an intermediate heat exchanger arranged between a chilled water return pipeline and a cooling water return pipeline, a water outlet of the intermediate heat exchanger is communicated with the chilled water return pipeline through a third three-way valve on one side of chilled water, and a water inlet of the intermediate heat exchanger is communicated with the cooling water return pipeline through a fourth three-way valve on one side of cooling water.
Preferably, the intermediate heat exchanger is a plate heat exchanger.
The energy-saving air-conditioning water system further comprises a cooling tower, wherein a bypass is connected in parallel on a water inlet and outlet pipeline of the cooling tower, and a fifth valve is arranged on the bypass.
The energy-saving air-conditioning water system provided by the invention further comprises a refrigeration tail end, and the front end of the refrigeration tail end is provided with a heat preservation water tank.
Preferably, the rear end of the refrigeration terminal is provided with an auxiliary electric heater.
Preferably, an expansion water tank is arranged on the chilled water return pipe.
Preferably, a water treatment device and a chilled water pump are arranged on the chilled water return pipeline.
Preferably, a water treatment device and a cooling water pump are arranged on the cooling water return pipeline.
The energy-saving air-conditioning water system provided by the invention is characterized in that a temperature sensor is arranged on the water outlet pipeline of the cooling tower.
The energy-saving air-conditioning water system provided by the invention at least comprises the following three cooling modes:
in the cold supply mode of the water chilling unit, at the moment, the first three-way valve V1 is communicated with a water outlet channel of chilled water, the other channel is disconnected, the second three-way valve V2 is communicated with a water outlet pipeline of cooling water, the other channel is disconnected, the third three-way valve V3 is disconnected from the water outlet pipeline of the intermediate heat exchanger, the other channel is disconnected, the fourth three-way valve V4 is disconnected from the water inlet pipeline of the intermediate heat exchanger, and the fifth valve V5 is closed;
in the combined cooling mode, at the moment, the first three-way valve V1 is communicated with a water outlet channel of chilled water, the other channel is disconnected, the second three-way valve V2 is communicated with a water outlet pipeline of cooling water, the other channel is disconnected, the third three-way valve V3 is communicated with a water outlet pipeline of the intermediate heat exchanger, the other channel is disconnected, the fourth three-way valve V4 is communicated with a cooling water inlet pipeline, and the other channel is disconnected;
in the natural cooling mode, at the moment, the first three-way valve V1 is communicated with the chilled water inlet and outlet pipeline, the other channel is disconnected, the second three-way valve V2 is communicated with the cooling water inlet and outlet pipeline, the other channel is disconnected, the third three-way valve V3 is respectively communicated with the water outlet pipeline of the intermediate heat exchanger and the water return pipeline of the chilled water, the fourth three-way valve V4 is communicated with the water inlet pipeline of the intermediate heat exchanger, and the other channel is disconnected.
Compared with the prior art, the invention has the following beneficial effects:
1. an intermediate heat exchanger is added, so that a natural cold source is fully utilized in transition seasons and winter, the starting time of a water chilling unit is shortened, and the purpose of energy conservation is achieved;
2. the cooling water system is not directly contacted with the chilled water system, so that the water quality flowing into the process equipment is not polluted;
3. the water chilling unit is high in energy efficiency, and the water chilling unit and the plate share the cooling tower, so that equipment investment is reduced.
Drawings
FIG. 1 is a system diagram of the present invention operating in a chiller cooling mode;
FIG. 2 is a diagram of a system of the present invention operating in a combined cooling mode;
fig. 3 is a diagram of a system for operating the present invention in a natural cooling mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
The traditional water chilling unit for cooling the process equipment is started all the year around, and the operation energy consumption and the operation cost are high. However, in winter, the outdoor temperature is low, and if an external natural cold source is directly used for cooling, the electric power resource can be saved as much as possible, so that the method has important practical significance for current global energy conservation and emission reduction, resource conservation and energy conservation.
In order to utilize the outdoor natural cold source in winter, the invention provides an energy-saving air-conditioning water system for process cooling from the perspective of energy conservation and consumption reduction, the system can realize various cooling modes such as direct cooling of a host machine, combined cooling of the host machine and a plate heat exchanger, direct cooling without the host machine and the like, and has the advantages of reducing equipment investment, reducing cost, improving system energy efficiency and the like.
As shown in fig. 1, the energy-saving air conditioning water system provided by the invention comprises a water chilling unit 1, a cooling water circulation loop 2, a chilled water circulation loop 3 and an intermediate heat exchanger 4. The air conditioning water system comprises a compressor, a condenser, a throttling device and an evaporator. The chilled water inlet and outlet of the water chilling unit are communicated through a first three-way valve V1, and the chilled water inlet and outlet are communicated through a second three-way valve V2.
The intermediate heat exchanger 4 is disposed between the chilled water return pipe and the cooling water return pipe. In this embodiment, the intermediate heat exchanger 4 is a plate heat exchanger for exchanging heat between the chilled water return pipe and the cooling water return pipe. On the chilled water side, the water inlet 41 of the intermediate heat exchanger 4 is communicated with a chilled water return pipeline, the water outlet is communicated with the chilled water return pipeline through a third three-way valve V3, and on the cooling water side, the water inlet of the intermediate heat exchanger is provided with a fourth three-way valve V4 through which communication with the cooling water return pipeline is communicated or disconnected.
The cooling water circulation is also provided with a cooling tower 21, and the cooling water exchanging heat with the condenser of the water chilling unit is cooled in the cooling tower and then recycled. The water inlet and outlet pipeline of the cooling tower is connected in parallel with a bypass, and a fifth valve V5 is arranged on the bypass. The cooling water return pipeline is also provided with a water treatment device 22 and a cooling water pump 23. And a temperature sensor T is arranged on the water outlet pipeline of the cooling tower.
The chilled water is used to cool the refrigeration terminal 31, for example, to provide refrigeration to the process equipment. The front end of the refrigeration tail end is provided with a heat preservation water tank 22, and the rear end of the refrigeration tail end is provided with an auxiliary electric heater 23, an expansion water tank 24, a freezing water pump 25 and a water treatment device 26.
The cold supply mode can be realized by the cold water unit directly supplying cold, the cold water unit and the intermediate heat exchanger jointly supplying cold and the three cold supply modes without the main engine directly supplying cold. The system provided by the invention adopts the platen heat exchanger for heat exchange, and the cooling water system is not directly contacted with the chilled water system, so that the water quality flowing into the process equipment is not polluted. Meanwhile, the platen heat exchanger can reduce the complexity of the system, improve the stability of the system and reduce the cost of the system. This application adopts the break-make of each pipeline of electronic three way valve regulation, compares that the cross valve is controlled more simply, and reduces the use of two-way valve, realizes more accurate control. In addition, this application still adopts supplementary electric heater, before winter starting equipment, can open electric heating in advance, rises lower water temperature to required temperature to guarantee the safe operation of processing equipment. In addition, the heat-preservation water tank is adopted to reduce the impact of water temperature fluctuation on process equipment and reduce the fault problem of the equipment caused by cooling water fluctuation
The energy-saving air-conditioning water system provided by the invention at least comprises the following three cooling modes:
(1) and a cold water supply mode of the water chilling unit.
And when the temperature sensor T monitors that the water outlet temperature of the cooling tower is higher than 15 ℃, a water chilling unit is used for cooling. The control system opens the ends a, c of the first three-way valve V1, opens the ends a, b of the second three-way valve V2, opens the ends a, b of the third three-way valve V3, opens the ends a, b of the fourth three-way valve V4, and closes the fifth valve V5.
As shown in fig. 1, in the cooling mode of the chiller, cooling water exchanges heat with the condenser in the chiller, then dissipates heat in the cooling tower, and then flows through the water pump 23 and the water treatment device 22 to enter the chiller again for circulation. After exchanging heat with the evaporator through the chiller, the chilled water enters the end device 31 (process equipment) through the heat-insulating water tank 22 (which is used for adjusting the cooling capacity of the process equipment) to be cooled, and then returns to the chiller to circulate.
(2) And the cold supply mode of the water chilling unit is switched to the combined cold supply mode.
When the cooling tower is in a cooling mode of the water chilling unit, if the temperature sensor T monitors that the temperature of the water discharged from the cooling tower is less than or equal to 15 ℃, the combined cooling mode is started. The end c of the third three-way valve V3 is opened and the end b is closed through the control system; the end c of the fourth three-way valve V4 is opened, the end a is closed, and the state of the rest valves is unchanged.
As shown in fig. 2, in the combined cooling mode, the chilled water enters the process equipment for cooling through the heat-insulating water tank 22 after exchanging heat with the evaporator through the chiller, then exchanges heat through the intermediate heat exchanger 4 and the cooling water system, and then enters the chiller for circulation.
After heat exchange is carried out between the cooling water and the condenser through the water chilling unit, the cooling water is radiated in the cooling tower, then flows through the water pump and the water treatment device, enters the intermediate heat exchanger to exchange heat with the water of the chilled water system, and then enters the water chilling unit to circulate.
(3) The combined cooling mode is switched to the natural cooling mode.
When the water chilling unit is in the combined cooling mode, if the temperature sensor T monitors that the temperature of the water discharged from the cooling tower is less than or equal to 10 ℃, the water chilling unit stops running, and the natural cooling mode is started. The ends a and b of the first three-way valve V1 are opened and the end c is closed through the control system; the ends b and c of the second three-way valve V2 are opened, and the end a is closed; opening ends a and c of the third three-way valve V3, and disconnecting the section b; the b, c ends of the fourth three-way valve V4 are opened and the a end is closed.
As shown in fig. 3, in the natural cooling mode, the process equipment is supplied with cooling energy through the intermediate heat exchanger 4, and the bypass water amount is adjusted by adjusting the opening degree of the third three-way valve V3, so that the temperature monitored by the temperature sensor T is maintained at 18-20 ℃.
If the intermediate heat exchanger is needed to be used in transition seasons, winter and the like and the intermediate heat exchanger fails, the water chilling unit is started, the fifth valve V5 is opened, the bypass water quantity is adjusted, the outlet water temperature T of the cooling tower is kept to 15 ℃, and the problem that the water chilling unit cannot operate due to the fact that the outlet water temperature of the cooling tower is too low is prevented.
The energy-saving air-conditioning water system provided by the invention has the following advantages:
(1) the system can at least realize three cooling modes of direct cooling of the main machine, combined cooling of the main machine and the plate heat exchanger and direct cooling without the main machine.
(2) In transition seasons and winter, the intermediate heat exchanger is used for heat exchange, and the electric three-way valve is used for controlling and adjusting water flow, so that the aim of adjusting water temperature is fulfilled.
(3) Through valve control, use one set of cooling tower with cooling water set and intermediate heat exchanger, solve the problem that needs two cooling towers among the prior art, further reduce the cost of equipment.
(4) The auxiliary electric heating is adopted, and before the equipment is started in winter, the electric heating can be started in advance, so that the lower water temperature is increased to the required water temperature, and the safe operation of the process equipment is ensured.
The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides an energy-conserving air conditioner water system, includes the cooling water set, its characterized in that, through first three-way valve intercommunication between the chilled water of cooling water set is imported and exported, through second three-way valve intercommunication between the cooling water is imported and exported, still includes an intermediate heat exchanger that sets up between chilled water return water pipeline and cooling water return water pipeline, and on chilled water one side, the delivery port of intermediate heat exchanger passes through third three-way valve and chilled water return water pipeline intercommunication, and on cooling water one side, the water inlet of intermediate heat exchanger passes through fourth three-way valve and cooling water return water pipeline intercommunication.
2. The energy saving air conditioning water system as claimed in claim 1, wherein the intermediate heat exchanger is a plate heat exchanger.
3. The energy-saving air-conditioning water system as claimed in claim 1, further comprising a cooling tower, wherein a bypass is connected in parallel with the water inlet and outlet pipeline of the cooling tower, and a fifth valve is arranged on the bypass.
4. The energy-saving air-conditioning water system as claimed in claim 1, further comprising a refrigeration terminal, wherein a heat preservation water tank is arranged at the front end of the refrigeration terminal.
5. The energy-saving air-conditioning water system as claimed in claim 4, wherein an auxiliary electric heater is provided at the rear end of the cooling terminal.
6. The energy-saving air-conditioning water system as claimed in claim 1, wherein an expansion tank is provided on the chilled water return pipe.
7. The energy-saving air-conditioning water system as claimed in claim 1, wherein a water treatment device and a chilled water pump are arranged on the chilled water return pipe.
8. The energy-saving air-conditioning water system as claimed in claim 1, wherein a water treatment device and a cooling water pump are arranged on the cooling water return pipe.
9. The energy-saving air-conditioning water system as claimed in claim 3, wherein a temperature sensor is arranged on the water outlet pipeline of the cooling tower.
10. The energy-saving water conditioning system as claimed in claim 1, wherein the energy-saving water conditioning system comprises at least the following three cooling modes:
in the cold supply mode of the water chilling unit, at the moment, the first three-way valve V1 is communicated with a water outlet channel of chilled water, the other channel is disconnected, the second three-way valve V2 is communicated with a water outlet pipeline of cooling water, the other channel is disconnected, the third three-way valve V3 is disconnected from the water outlet pipeline of the intermediate heat exchanger, the other channel is disconnected, the fourth three-way valve V4 is disconnected from the water inlet pipeline of the intermediate heat exchanger, and the fifth valve V5 is closed;
in the combined cooling mode, at the moment, the first three-way valve V1 is communicated with a water outlet channel of chilled water, the other channel is disconnected, the second three-way valve V2 is communicated with a water outlet pipeline of cooling water, the other channel is disconnected, the third three-way valve V3 is communicated with a water outlet pipeline of the intermediate heat exchanger, the other channel is disconnected, the fourth three-way valve V4 is communicated with a cooling water inlet pipeline, and the other channel is disconnected;
in the natural cooling mode, at the moment, the first three-way valve V1 is communicated with the chilled water inlet and outlet pipeline, the other channel is disconnected, the second three-way valve V2 is communicated with the cooling water inlet and outlet pipeline, the other channel is disconnected, the third three-way valve V3 is respectively communicated with the water outlet pipeline of the intermediate heat exchanger and the water return pipeline of the chilled water, the fourth three-way valve V4 is communicated with the water inlet pipeline of the intermediate heat exchanger, and the other channel is disconnected.
CN201911320705.0A 2019-12-19 2019-12-19 Energy-saving air conditioner water system Withdrawn CN110940014A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911320705.0A CN110940014A (en) 2019-12-19 2019-12-19 Energy-saving air conditioner water system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911320705.0A CN110940014A (en) 2019-12-19 2019-12-19 Energy-saving air conditioner water system

Publications (1)

Publication Number Publication Date
CN110940014A true CN110940014A (en) 2020-03-31

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CN201911320705.0A Withdrawn CN110940014A (en) 2019-12-19 2019-12-19 Energy-saving air conditioner water system

Country Status (1)

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CN (1) CN110940014A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101650056A (en) * 2009-09-09 2010-02-17 北京康孚环境控制有限公司 Combined cold supply system of cooling towers and water cooling unit and control method thereof
CN105387547A (en) * 2015-12-15 2016-03-09 长沙麦融高科股份有限公司 Multi-source heat-tube energy-saving system and refrigerating method based on multi-source heat tube
CN206055810U (en) * 2016-09-30 2017-03-29 安徽中烟工业有限责任公司 A kind of United system of air-conditioning
WO2018000345A1 (en) * 2016-06-30 2018-01-04 深圳市艾特网能技术有限公司 Air conditioner for use in natural cooling machine room and condensate depression control method therefor
CN208765140U (en) * 2018-06-15 2019-04-19 中国海诚工程科技股份有限公司 A kind of refrigeration system of winter low energy consumption

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101650056A (en) * 2009-09-09 2010-02-17 北京康孚环境控制有限公司 Combined cold supply system of cooling towers and water cooling unit and control method thereof
CN105387547A (en) * 2015-12-15 2016-03-09 长沙麦融高科股份有限公司 Multi-source heat-tube energy-saving system and refrigerating method based on multi-source heat tube
WO2018000345A1 (en) * 2016-06-30 2018-01-04 深圳市艾特网能技术有限公司 Air conditioner for use in natural cooling machine room and condensate depression control method therefor
CN206055810U (en) * 2016-09-30 2017-03-29 安徽中烟工业有限责任公司 A kind of United system of air-conditioning
CN208765140U (en) * 2018-06-15 2019-04-19 中国海诚工程科技股份有限公司 A kind of refrigeration system of winter low energy consumption

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Application publication date: 20200331