CN108413666B - Efficient air source heat pump system capable of quickly defrosting - Google Patents
Efficient air source heat pump system capable of quickly defrosting Download PDFInfo
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- CN108413666B CN108413666B CN201810183805.2A CN201810183805A CN108413666B CN 108413666 B CN108413666 B CN 108413666B CN 201810183805 A CN201810183805 A CN 201810183805A CN 108413666 B CN108413666 B CN 108413666B
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- defrosting
- temperature sensor
- fin evaporator
- heat pump
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/004—Control mechanisms
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/065—Removing frost by mechanical means
Abstract
A high-efficiency air source heat pump system capable of quickly defrosting comprises a compressor, a four-way valve, a gas-liquid separator, an outdoor fin evaporator, an indoor heat exchanger, a first electromagnetic valve, a controller and a defrosting device, wherein the four-way valve is connected with the outdoor fin evaporator; the indoor heat exchanger is provided with a first temperature sensor, the air outlet side of the outdoor fin evaporator is provided with a second temperature sensor and a reversible fan, and the reversible fan can be reversed and has two working states of air draft and air supply; a third temperature sensor and a defrosting device are arranged on the air inlet side of the outdoor fin evaporator; the controller is respectively connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the first electromagnetic valve, the reversible fan and the defrosting device; the invention provides a quick defrosting high-efficiency air source heat pump system, which has three defrosting modes, is high in defrosting efficiency, energy-saving and environment-friendly, obviously reduces defrosting time, and effectively ensures indoor thermal comfort.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a high-efficiency air source heat pump system capable of quickly defrosting.
Background
The air source heat pump has the advantages of cooling and heating, small occupied space, energy conservation, environmental protection, convenience and the like, and is more and more favored. However, the frosting problem is a main factor influencing normal heating of the heat pump unit in winter, and particularly in cold northern areas and south areas with high humidity and cold, the development of the air source heat pump is severely restricted.
A great deal of research has been done at home and abroad on defrosting of an air source heat pump, and two common defrosting methods are reverse cycle defrosting and hot gas bypass defrosting, but both defrosting methods consume much energy and affect the heating effect during defrosting, so a control defrosting method capable of reducing the defrosting frequency as much as possible is needed; the existing defrosting control method mostly adopts a timing control method or a single temperature method, the timing control method carries out defrosting in corresponding time, and the defect is that unnecessary defrosting operation causes unnecessary waste; the single temperature method is that a temperature sensor is used for detecting the surface temperature of the finned tube of the heat exchanger, defrosting is carried out according to temperature setting, but misoperation is easy to occur once the temperature sensor is damaged; in addition, no matter a timing control method or a single temperature method, the defrosting is controlled to be started after the frosting is very thick, so that the difficulty in defrosting is inevitable, the defrosting time is long, and the heating effect is adversely affected; when the frost is little, the defrosting is started, so that the energy consumption is large, the load on the heat pump system is heavy, and the energy conservation and the maintenance of the heat pump system are not facilitated.
In addition, the frosting of the outdoor heat exchanger is only carried out on the air inlet side at the frosting initial stage, and the frosting is possible to be carried out on the air outlet side of the heat exchanger only when the repeated defrosting is not completed and the frost layer is thicker and thicker, so that the temperature of the non-frosting side of the outdoor heat exchanger is higher than that of the frosting side in the normal defrosting process, the air near the non-frosting side is heated and then rises and is not used for the defrosting of the frosting side, and the energy is wasted; when the frost layer is thick, once the frost attached to the surface of the outdoor heat exchanger is melted and a gap is formed between the frost layer and the outdoor heat exchanger, the outdoor heat exchanger cannot transfer heat to the frost layer in a heat conduction mode, and finally, a hollow frost shell which is difficult to remove can be formed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a quick-defrosting high-efficiency air source heat pump system which has three defrosting modes, is high in defrosting efficiency, energy-saving and environment-friendly, remarkably reduces defrosting time, and effectively ensures indoor thermal comfort.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high-efficiency air source heat pump system capable of quickly defrosting comprises a compressor, a four-way valve, a gas-liquid separator, an outdoor fin evaporator, an indoor heat exchanger, a first electromagnetic valve, a controller and a defrosting device, wherein a first interface of the four-way valve is sequentially communicated with the first electromagnetic valve, the indoor heat exchanger, a filter, a liquid storage device and the outdoor fin evaporator;
the indoor heat exchanger is provided with a first temperature sensor, the air outlet side of the outdoor fin evaporator is provided with a second temperature sensor and a reversible fan, and the reversible fan can be reversed and has two working states of air draft and air supply; a third temperature sensor and a defrosting device are arranged on the air inlet side of the outdoor fin evaporator; the controller is respectively connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the first electromagnetic valve, the reversible fan and the defrosting device;
when the temperature difference measured by the first temperature sensor and the third temperature sensor is greater than a first threshold value and less than a second threshold value, the frosting on the air inlet side of the outdoor fin evaporator is less, the controller only starts the defrosting device to perform preliminary defrosting according to a preset first defrosting mode, and the working state of the heat pump system is unchanged;
when the temperature difference measured by the first temperature sensor and the third temperature sensor is larger than a second threshold value, the indoor and outdoor temperature difference is increased, the frosting of the outdoor fin evaporator is increased, the controller starts a second defrosting mode to provide heat for the outdoor fin evaporator for defrosting, and the reversible fan stops working;
when the heat pump system is in the second defrosting mode, if the temperature difference measured by the second temperature sensor and the third temperature sensor is greater than a third threshold value, the heat pump system further starts the third defrosting mode, the reversible motor starts to rotate reversely, heated air at the air outlet side of the outdoor fin evaporator is blown to a frost layer at the air inlet side of the outdoor fin evaporator, and the defrosting speed is accelerated;
when the heat pump system is in the third defrosting mode, if the temperature difference measured by the second temperature sensor and the third temperature sensor is smaller than the fourth threshold value, the reversible fan stops working, and the heat pump system returns to the second defrosting mode again.
Preferably, the second threshold is greater than the first threshold, and the third threshold is greater than the fourth threshold; the defrosting device comprises guide rails arranged at the left end and the right end of the air inlet side of the outdoor fin evaporator, a plurality of rows of hairbrushes capable of sliding up and down are arranged between the guide rails, rotating shafts of the plurality of rows of hairbrushes are connected with a rotating motor through a linkage rod, the rotating motor is arranged at the bottom of the air inlet side of the outdoor fin evaporator, and when the rotating motor works, the plurality of rows of hairbrushes can rotate to defrost; and the third temperature sensor is arranged at the position, close to the bottom fins, of the air inlet side of the outdoor fin evaporator.
Preferably, the first defrosting mode is to perform at least two preliminary defrosters within one hour, and the time of each preliminary defrosting is at least five minutes.
Preferably, the second defrosting mode is a reverse cycle defrosting mode, the four-way valve is switched over, the first electromagnetic valve is switched on, the heat pump system runs reversely, and heat is provided for the outdoor fin evaporator through power consumption of the compressor and heat absorption from the indoor, so that the defrosting purpose is achieved.
Preferably, the second defrosting mode is a hot gas bypass defrosting mode, a second interface of the four-way valve is further connected with a second electromagnetic valve, the other end of the second electromagnetic valve is respectively connected to two ends of the outdoor fin evaporator, and the controller is connected with and controls the second electromagnetic valve; the four-way valve is not reversed, the second electromagnetic valve is opened, and the exhaust of the compressor is discharged to the inlet of the outdoor fin evaporator through the bypass pipeline to perform heat release defrosting.
Compared with the prior art, the invention has the beneficial effects that: a high-efficiency air source heat pump system capable of quickly defrosting has three defrosting modes, when frosting is less, a first defrosting mode is adopted to defrost by using a brush, energy consumption is less, meanwhile, the defrosting difficulty of a second defrosting mode is reduced, and the load of the heat pump system is lightened; when frost is thick and the first defrosting mode is not enough to defrost, the second defrosting mode is adopted, and because the frosting thickness is reduced by the previous first defrosting mode, the defrosting speed of the second defrosting mode is higher, the defrosting time is obviously reduced, and the reduction of indoor thermal comfort is avoided; the third defrosting mode is used for starting the reversible fan to reversely supply air in the defrosting process, forcing the air to enter the outdoor fin evaporator from the non-frosting side and flow to the frosting side, blowing the heated air to the frost layer for defrosting, so that the defrosting can be quickly and effectively realized, and ice shells finally formed due to long-term defrosting can be quickly removed, thereby improving the heating efficiency of the heat pump and saving energy; and the temperature difference of the three temperature sensors is used as a method for judging whether defrosting is performed or not, so that the accuracy is high, and the error rate is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying description and examples:
detailed description of the invention: a quick defrosting high-efficiency air source heat pump system has three defrosting modes, and adopts the temperature difference of three temperature sensors as a method for judging whether to defrost: when the frosting is less, the first defrosting mode is adopted to defrost by the brush, the energy consumption is less, meanwhile, the defrosting difficulty of the second defrosting mode is reduced, and the load of a heat pump system is reduced; when frost is thick and the first defrosting mode is not enough to defrost, a second defrosting mode is adopted, the second defrosting mode is a reverse cycle defrosting mode or a hot gas bypass defrosting mode, and the frost thickness is reduced due to the previous first defrosting mode, so that the defrosting speed of the second defrosting mode is higher, the defrosting time is obviously reduced, and the reduction of indoor thermal comfort is avoided; the third defrosting mode is used for starting the reversible fan to reversely supply air in the defrosting process, forcing air to enter the outdoor fin evaporator from the non-frosting side and flow to the frosting side, blowing the heated air to the frost layer for defrosting, so that the defrosting can be quickly and effectively carried out, and ice shells finally formed due to long-term defrosting can be quickly removed, thereby improving the heating efficiency of the heat pump and saving energy.
The first embodiment is as follows: referring to fig. 1, a high-efficiency air source heat pump system for rapid defrosting comprises a compressor 1, a four-way valve 4, a gas-liquid separator 5, an outdoor fin evaporator 3, an indoor heat exchanger 2 and a first electromagnetic valve 6, wherein a first interface of the four-way valve is sequentially communicated with the first electromagnetic valve, the indoor heat exchanger, a filter 12, a liquid reservoir 11 and the outdoor fin evaporator, the other end of the outdoor fin evaporator is communicated with a third interface of the four-way valve, a second interface of the four-way valve is sequentially communicated with the compressor and the gas-liquid separator and then is connected with a fourth interface of the four-way valve, and the high-efficiency air source heat pump system further;
a first temperature sensor 13 is arranged on the indoor heat exchanger, a second temperature sensor 14 and a reversible fan 8 are arranged on the air outlet side of the outdoor fin evaporator, and the reversible fan can be reversed and has two working states of air draft and air supply; a third temperature sensor 15 and a defrosting device 9 are arranged on the air inlet side of the outdoor fin evaporator; the controller is respectively connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the first electromagnetic valve, the reversible fan and the defrosting device;
when the temperature difference measured by the first temperature sensor and the third temperature sensor is greater than a first threshold value and less than a second threshold value, the frosting on the air inlet side of the outdoor fin evaporator is less, the controller only starts the defrosting device to perform preliminary defrosting according to a preset first defrosting mode, and the working state of the heat pump system is unchanged;
when the temperature difference measured by the first temperature sensor and the third temperature sensor is larger than a second threshold value, the indoor and outdoor temperature difference is increased, the frosting of the outdoor fin evaporator is increased, the controller starts a second defrosting mode to provide heat for the outdoor fin evaporator for defrosting, and the reversible fan stops working;
when the heat pump system is in the second defrosting mode, if the temperature difference measured by the second temperature sensor and the third temperature sensor is greater than a third threshold value, the heat pump system further starts the third defrosting mode, the reversible motor starts to rotate reversely, heated air at the air outlet side of the outdoor fin evaporator is blown to a frost layer at the air inlet side of the outdoor fin evaporator, and the defrosting speed is accelerated;
when the heat pump system is in the third defrosting mode, if the temperature difference measured by the second temperature sensor and the third temperature sensor is smaller than the fourth threshold value, the reversible fan stops working, and the heat pump system returns to the second defrosting mode again.
The second threshold is greater than the first threshold, and the third threshold is greater than the fourth threshold; the defrosting device comprises guide rails arranged at the left end and the right end of the air inlet side of the outdoor fin evaporator, a plurality of rows of hairbrushes capable of sliding up and down are arranged between the guide rails, rotating shafts of the plurality of rows of hairbrushes are connected with a rotating motor 10 through a linkage rod, the rotating motor is arranged at the bottom of the air inlet side of the outdoor fin evaporator, and when the rotating motor works, the plurality of rows of hairbrushes can rotate to defrost; and the third temperature sensor is arranged at the position, close to the bottom fins, of the air inlet side of the outdoor fin evaporator.
The first defrosting mode is to carry out at least two times of primary defrosting within one hour, and the time of each time of primary defrosting is at least five minutes.
The second defrosting mode is a reverse circulation defrosting mode, the four-way valve is switched over, the first electromagnetic valve is switched on, the heat pump system runs reversely, and heat is provided for the outdoor fin evaporator through the power consumption of the compressor and the heat absorption from the indoor space, so that the defrosting purpose is achieved.
The second embodiment: referring to fig. 2, the second defrosting mode is a hot gas bypass defrosting mode, a second interface of the four-way valve is further connected to a second electromagnetic valve 7, the other end of the second electromagnetic valve is respectively connected to two ends of the outdoor fin evaporator, and the controller is connected to and controls the second electromagnetic valve; the four-way valve is not reversed, the second electromagnetic valve is opened, and the exhaust of the compressor is discharged to the inlet of the outdoor fin evaporator through the bypass pipeline to perform heat release defrosting.
The main functions of the invention are as follows: the utility model provides a high-efficient air source heat pump system of quick defrosting, its has three kinds of defrosting modes, and the defrosting is efficient, and energy-concerving and environment-protective is showing and is reducing the defrosting time, has effectively guaranteed indoor hot comfort level.
In summary, after reading the present disclosure, those skilled in the art can make various other corresponding changes without creative mental labor according to the technical solutions and concepts of the present disclosure, and all of them are within the protection scope of the present disclosure.
Claims (5)
1. The utility model provides a high-efficient air source heat pump system of quick defrosting, includes compressor, cross valve, vapour and liquid separator, outdoor fin evaporator, indoor heat exchanger and first solenoid valve, the first interface of cross valve communicates first solenoid valve, indoor heat exchanger, filter, reservoir and outdoor fin evaporator in proper order, the third interface of the other end intercommunication cross valve of outdoor fin evaporator, the second interface of cross valve communicates the fourth interface connection with the cross valve behind compressor, the vapour and liquid separator in proper order, its characterized in that: the defrosting device also comprises a controller and a defrosting device;
the indoor heat exchanger is provided with a first temperature sensor, the air outlet side of the outdoor fin evaporator is provided with a second temperature sensor and a reversible fan, and the reversible fan can be reversed and has two working states of air draft and air supply;
a third temperature sensor and a defrosting device are arranged on the air inlet side of the outdoor fin evaporator;
the controller is respectively connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the first electromagnetic valve, the reversible fan and the defrosting device;
when the temperature difference measured by the first temperature sensor and the third temperature sensor is greater than a first threshold value and less than a second threshold value, the frosting on the air inlet side of the outdoor fin evaporator is less, the controller only starts the defrosting device to perform preliminary defrosting according to a preset first defrosting mode, and the working state of the heat pump system is unchanged;
when the temperature difference measured by the first temperature sensor and the third temperature sensor is larger than a second threshold value, the indoor and outdoor temperature difference is increased, the frosting of the outdoor fin evaporator is increased, the controller starts a second defrosting mode to provide heat for the outdoor fin evaporator for defrosting, and the reversible fan stops working;
when the heat pump system is in the second defrosting mode, if the temperature difference measured by the second temperature sensor and the third temperature sensor is greater than a third threshold value, the heat pump system further starts the third defrosting mode, the reversible fan starts to rotate reversely, heated air at the air outlet side of the outdoor fin evaporator is blown to a frost layer at the air inlet side of the outdoor fin evaporator, and the defrosting speed is accelerated;
when the heat pump system is in the third defrosting mode, if the temperature difference measured by the second temperature sensor and the third temperature sensor is smaller than the fourth threshold value, the reversible fan stops working, and the heat pump system returns to the second defrosting mode again.
2. The rapid defrost, high efficiency air source heat pump system of claim 1 wherein: the second threshold is greater than the first threshold, and the third threshold is greater than the fourth threshold;
the defrosting device comprises guide rails arranged at the left end and the right end of the air inlet side of the outdoor fin evaporator, a plurality of rows of hairbrushes capable of sliding up and down are arranged between the guide rails, rotating shafts of the plurality of rows of hairbrushes are connected with a rotating motor through a linkage rod, the rotating motor is arranged at the bottom of the air inlet side of the outdoor fin evaporator, and when the rotating motor works, the plurality of rows of hairbrushes can rotate to defrost;
and the third temperature sensor is arranged at the position, close to the bottom fins, of the air inlet side of the outdoor fin evaporator.
3. A rapid defrost, high efficiency air source heat pump system as in claim 1 or 2 wherein: the first defrosting mode is to carry out at least two times of primary defrosting within one hour, and the time of each time of primary defrosting is at least five minutes.
4. A rapid defrost, high efficiency air source heat pump system as in claim 3 wherein: the second defrosting mode is a reverse circulation defrosting mode, the four-way valve is switched over, the first electromagnetic valve is switched on, the heat pump system runs reversely, and heat is provided for the outdoor fin evaporator through the power consumption of the compressor and the heat absorption from the indoor space, so that the defrosting purpose is achieved.
5. A rapid defrost, high efficiency air source heat pump system as in claim 3 wherein: the second defrosting mode is a hot gas bypass defrosting mode, a second interface of the four-way valve is also connected with a second electromagnetic valve, the other end of the second electromagnetic valve is respectively connected to two ends of the outdoor fin evaporator, and the controller is connected with and controls the second electromagnetic valve; the four-way valve is not reversed, the second electromagnetic valve is opened, and the exhaust of the compressor is discharged to the inlet of the outdoor fin evaporator through the bypass pipeline to perform heat release defrosting.
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| CN201810183805.2A CN108413666B (en) | 2018-03-07 | 2018-03-07 | Efficient air source heat pump system capable of quickly defrosting |
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| CN201810183805.2A CN108413666B (en) | 2018-03-07 | 2018-03-07 | Efficient air source heat pump system capable of quickly defrosting |
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| CN108413666B true CN108413666B (en) | 2021-01-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110470015A (en) * | 2019-08-03 | 2019-11-19 | 青岛海尔空调器有限总公司 | Control method and device, air-conditioning for air-conditioner defrosting |
| CN110470020B (en) * | 2019-08-04 | 2022-02-15 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110425807A (en) * | 2019-08-09 | 2019-11-08 | 四川虹美智能科技有限公司 | A kind of apparatus for removing refrigerator frost and refrigerator defrosting method |
| CN110617560A (en) * | 2019-09-10 | 2019-12-27 | 成都仙德科技有限公司 | Portable sound energy air conditioner waste heat recycling method |
| CN112539517A (en) * | 2019-09-20 | 2021-03-23 | 青岛海尔空调器有限总公司 | Method and device for defrosting of air conditioner and air conditioner |
| JP7445287B2 (en) * | 2019-12-26 | 2024-03-07 | アクア株式会社 | refrigerator |
| CN111351248B (en) * | 2020-03-13 | 2021-10-08 | 海信（山东）空调有限公司 | Air conditioning system and control method |
| CN111649510B (en) * | 2020-05-26 | 2022-03-04 | 北京新能源汽车股份有限公司 | Vehicle, defrosting control method and defrosting control device of heat pump air conditioning system |
| CN112710121A (en) * | 2020-12-30 | 2021-04-27 | Tcl家用电器（合肥）有限公司 | Control method, control device, refrigerator and computer-readable storage medium |
| CN112902515A (en) * | 2021-03-07 | 2021-06-04 | 广东纽恩泰新能源科技发展有限公司 | Air source heat pump defrosting control system and control method |
| CN114857806B (en) * | 2022-05-05 | 2023-07-14 | 山东和同信息科技股份有限公司 | Multifunctional complementary air source heat pump system with defrosting function |
| CN115307347B (en) * | 2022-06-24 | 2024-01-12 | 湖南松川爱能科技有限公司 | Power supply device combining solar energy and air source heat pump |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102242776B1 (en) * | 2014-03-20 | 2021-04-20 | 엘지전자 주식회사 | Air Conditioner and Controlling method for the same |
| WO2017017813A1 (en) * | 2015-07-29 | 2017-02-02 | 三菱電機株式会社 | Exterior unit |
| CN106766336A (en) * | 2017-01-20 | 2017-05-31 | 杨胜东 | A kind of online defrosting air source heat pump system |
| CN107461962A (en) * | 2017-08-17 | 2017-12-12 | 天津大学 | Air source heat pump defrosting system and method based on image procossing and hot-gas bypass |
| CN107560218B (en) * | 2017-09-14 | 2020-04-10 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and defrosting control method thereof |
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Address after: 510000 No. 96 Binhe Road, Huangpu District, Guangzhou City, Guangdong Province, Self-numbered Building No. 2, Floor 1, 203-B Applicant after: Liyang (Guangdong) Energy Saving Technology Co.,Ltd. Address before: 510000 No. 96 Binhe Road, Huangpu District, Guangzhou City, Guangdong Province, Self-numbered Building No. 2, Floor 1, 203-B Applicant before: GUANGZHOU LIYANG ENERGY TECHNOLOGY Co.,Ltd. |
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Denomination of invention: A high-efficiency air source heat pump system for rapid defrosting Effective date of registration: 20230807 Granted publication date: 20210108 Pledgee: Bank of China Limited Guangzhou Development Zone Branch Pledgor: Liyang (Guangdong) Energy Saving Technology Co.,Ltd. Registration number: Y2023980051169 |
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