CN114646166A - Refrigerator for recovering waste heat by using latent heat type functional fluid, defrosting system and defrosting method - Google Patents
Refrigerator for recovering waste heat by using latent heat type functional fluid, defrosting system and defrosting method Download PDFInfo
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- CN114646166A CN114646166A CN202210249763.4A CN202210249763A CN114646166A CN 114646166 A CN114646166 A CN 114646166A CN 202210249763 A CN202210249763 A CN 202210249763A CN 114646166 A CN114646166 A CN 114646166A
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- 238000010257 thawing Methods 0.000 title claims abstract description 81
- 239000012530 fluid Substances 0.000 title claims abstract description 73
- 239000002918 waste heat Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims description 49
- 238000005338 heat storage Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 8
- 239000003094 microcapsule Substances 0.000 claims description 7
- 229920000877 Melamine resin Polymers 0.000 claims description 3
- 239000004640 Melamine resin Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000004146 energy storage Methods 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 description 8
- 239000012782 phase change material Substances 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000011162 core material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000013529 heat transfer fluid Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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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
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
-
- 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
-
- 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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
-
- 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
- F25B2600/01—Timing
-
- 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
-
- 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
- F25D2600/00—Control issues
- F25D2600/02—Timing
-
- 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
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a refrigerator for recovering waste heat by using latent heat type functional fluid, a defrosting system and a defrosting method. The invention integrates the two characteristics of the energy storage and the transportation medium of the latent heat type functional fluid, so that the characteristics of matching the energy supply and demand parties in time and strength are exerted to the utmost extent, intelligent defrosting is realized, energy is saved, power consumption is reduced, low carbon and environmental protection are realized, heat exchange is efficient, and the operation is stable.
Description
Technical Field
The invention relates to the technical field of refrigeration of refrigerators, in particular to an intelligent defrosting method by utilizing latent heat type functional fluid.
Background
In recent years, with the improvement of living standard of people, the popularization rate of the refrigerator is higher and higher, and the refrigerator becomes one of electric appliances essential to daily life of people. With the increasing social requirements on energy conservation, emission reduction, environmental protection and sustainable development, the refrigerator is used as an important component of household energy consumption, and has very important application value in reducing the energy consumption of the refrigerator. At present, the evaporator frosting is a very common phenomenon, and because the heat conductivity coefficient of the frost layer is small, the heat transfer performance of the evaporator can be reduced, the energy consumption is increased, and even the system is blocked in serious conditions, so that the refrigerator can not work normally. Therefore, the refrigerator defrosting function optimization and improvement has wide application prospect.
The existing refrigerator mainly adopts two modes of active defrosting and passive defrosting. The active defrosting has the disadvantage that the power consumption for defrosting accounts for about 10% -15% of the power consumption of the whole refrigerator, so that the overall energy consumption of the refrigerator is very large. Passive defrosting has the disadvantage that once the cold surface is covered by a layer of frost, the surface treatment technique no longer plays any role. Therefore, on the premise of not reducing the heat exchange performance of various equipment at the energy supply end and the energy utilization end, the refrigerator defrosting system is optimized to achieve the effect of reducing defrosting energy consumption, the energy utilization rate is improved, and the refrigerator defrosting system has important significance in overall energy conservation, optimization, consumption reduction and intelligent management and regulation.
Disclosure of Invention
The embodiment of the invention provides a refrigerator for recovering waste heat by using a latent heat type functional fluid, a defrosting system and a defrosting method, which can avoid energy consumption waste, integrate two characteristics of energy storage and serving as a transportation medium of the latent heat type functional fluid, bring the matched characteristics of energy supply and demand parties in time and strength into full play, realize intelligent defrosting, save electricity and stably operate, and can realize high-efficiency heat exchange.
In order to solve the above object, the embodiments of the present invention provide the following technical solutions:
a refrigerator defrosting system for recovering waste heat by using latent heat type functional fluid comprises a compressor, an evaporator and a liquid storage tank, wherein the liquid storage tank is arranged between the compressor and the evaporator, one side of the liquid storage tank is connected by a pipeline to form a heat storage circulating pipeline of a loop, and a circulating pump II and a compressor collecting pipe are arranged on the pipeline of the heat storage circulating pipeline; the other side of the liquid storage tank is connected with a defrosting circulation pipeline forming a loop through a pipeline, and an evaporator collecting pipe and a first circulation pump are arranged on the pipeline of the defrosting circulation pipeline;
the liquid storage tank is filled with latent heat type functional fluid, the latent heat type functional fluid can flow in the heat storage circulation pipeline and the defrosting circulation pipeline, the compressor collecting pipe is gathered and wound on the compressor to form a pipe network, and the evaporator collecting pipe is gathered and wound on the evaporator to form the pipe network.
Illustratively, a third electromagnetic valve and a fourth electromagnetic valve are arranged on the heat storage circulating pipeline; the defrosting circulation pipeline is provided with a first electromagnetic valve and a second electromagnetic valve; the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are all connected with a control system through electric wires.
Illustratively, the evaporator is provided with three humidity sensors, the three humidity sensors are respectively arranged at the upper part, the middle part and the lower part of the evaporator, and the humidity sensors are electrically connected with the control system.
For example, the humidity sensor monitors the humidity of the air near the evaporator surface in real time and is preset with a lower threshold and an upper threshold.
Illustratively, the latent heat type functional fluid consists of phase-change microcapsule particles and a base liquid, wherein the base liquid is deionized water, and the phase-change microcapsule particles are paraffin-melamine resin particles.
The utility model provides an use refrigerator of latent heat type functional fluid recovery waste heat, the refrigerator include the refrigerator defrost system of recovery latent heat type functional fluid waste heat, the evaporimeter with by capillary network and pipe connection between the compressor, be equipped with condenser and drier-filter on the pipeline.
A defrosting method for a refrigerator using a latent heat type functional fluid to recover waste heat, the method using the refrigerator using the latent heat type functional fluid to recover the waste heat and a defrosting system for the refrigerator using the latent heat type functional fluid to recover the waste heat, the method comprising the steps of:
s1: the compressor works, the first electromagnetic valve and the second electromagnetic valve are closed, the third electromagnetic valve and the fourth electromagnetic valve are opened, the second circulating pump works to pump and circulate the latent heat type functional fluid in the liquid storage tank, the latent heat type functional fluid is conveyed through a pipeline and fully exchanges heat with the compressor through a pipe network formed by the compressor gathering pipe and then flows back to the liquid storage tank, the absorbed waste heat is stored in the latent heat type functional fluid, and the temperature of liquid in the liquid storage tank is increased;
s2: when the evaporator starts to work, the surface temperature of the evaporator starts to decrease, moisture in the air starts to be solidified and frosted on the surface of the evaporator, the humidity sensor arranged on the surface of the evaporator monitors that the humidity reaches a set lower limit critical value, and a signal is transmitted to the control system;
s3: the control system receives signals and controls the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve to be opened, the circulating pump starts to work, latent heat type functional fluid which stores heat in the liquid storage tank is conveyed to a pipe network which is formed by an evaporator gathering pipe and is close to the evaporator through a pipeline, latent heat is released near the surface of the evaporator, defrosting is started, and the latent heat type functional fluid which is cooled after the temperature is reduced is pumped back to the liquid storage tank through the first circulating pump;
s4: and when the surface humidity of the evaporator rises, a humidity sensor arranged on the surface of the evaporator monitors that the humidity reaches a set upper limit critical value, a signal is transmitted to the control system, the control system receives the signal and controls the first electromagnetic valve and the second electromagnetic valve to be closed, the first circulating pump stops working, and a defrosting cycle is finished.
For example, when the refrigerator normally works, the heat storage cycle is circulated first, the defrosting cycle is in a closed state at this time, and when the control system opens all the electromagnetic valves, the circulating pump starts to work, and the defrosting cycle is opened at this time.
For example, the humidity sensor can accurately detect the relative humidity of the measured point and the dry-bulb humidity.
Compared with the prior art, the technical scheme at least has the following beneficial effects:
according to the scheme, the defrosting system of the refrigerator for recovering waste heat by using the latent heat type functional fluid adopts the latent heat type functional fluid for defrosting, integrates the two characteristics of energy storage and serving as a transportation medium of the latent heat type functional fluid, and enables the characteristics of matching the energy supply and demand parties in time and strength to be brought into full play, so that intelligent defrosting is realized; and the latent heat type functional fluid can be recycled as a phase-change material, and has high energy storage density and constant phase-change temperature.
The refrigerator defrosting method for recovering waste heat by using the latent heat type functional fluid is characterized in that waste heat of a storage compressor is collected and stored in a heat storage cycle, and is defrosted by using the waste heat through a defrosting cycle, the whole process saves energy, does not waste energy, is low-carbon and environment-friendly, and the heat storage cycle and the defrosting cycle are controlled by a control system, and are stable in operation and intelligent in regulation and control; the method adopts a novel working medium to effectively store energy, and the heat exchange is more efficient;
compared with the traditional active defrosting method of the refrigerator, the defrosting method saves electricity at 0.246 ℃, and saves more energy;
the defrosting method can achieve the real frostless purpose by setting the upper limit critical value and the lower limit critical value of the humidity, so that the surface of the evaporator can not generate a frost layer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the heat storage cycle and the defrosting cycle of the refrigerator and the defrosting system for recovering waste heat by using latent heat type functional fluid according to the present invention;
FIG. 2 is a diagram of a defrosting control system algorithm implemented by the defrosting method of the refrigerator using latent heat type functional fluid to recover waste heat according to the present invention;
FIG. 3 is a flow chart of the defrosting method of the refrigerator using latent heat type functional fluid to recover the residual heat according to the present invention.
Wherein the reference numerals are as follows:
101. a control system; 102. an evaporator; 103. a first electromagnetic valve; 104. a first circulating pump; 105. a second electromagnetic valve; 106. a capillary network; 107. drying the filter; 108. a liquid storage tank; 109. a second circulating pump; 110. a third electromagnetic valve; 111. a fourth electromagnetic valve; 112. a compressor; 113. a condenser; 114. a compressor header; 115. an evaporator collection tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that "up", "down", "left", "right", "front", "back", and the like used in the present invention are only used to indicate relative positional relationships, and when the absolute position of a described object is changed, the relative positional relationship may be changed accordingly.
The invention provides a refrigerator capable of intelligently defrosting, saving energy, realizing low carbon and environmental protection, efficiently exchanging heat and stably running and recovering waste heat by using latent heat type functional fluid, and a defrosting system and a defrosting method thereof, aiming at the problems of high energy consumption and the like of a defrosting system of the refrigerator in the market at present.
As shown in fig. 1, in the refrigerator for recovering waste heat by using latent heat type functional fluid according to the embodiment of the present invention, a capillary network 106 and a pipeline are arranged between an evaporator 102 and a compressor 112, the pipeline is provided with a condenser 113 and a dry filter 107, and the refrigerator includes a refrigerator defrosting system for recovering waste heat of latent heat type functional fluid.
As shown in fig. 1, an embodiment of the present invention provides a refrigerator defrosting system using latent heat functional fluid to recover waste heat, including a liquid storage tank 108, where the liquid storage tank 108 is disposed between the compressor 112 and the evaporator 102, the liquid storage tank 108 is filled with latent heat functional fluid as an energy transmission medium, the latent heat functional fluid has characteristics of phase change energy storage and efficient heat exchange, and can flow in a pipeline, the latent heat functional fluid is composed of phase change microcapsule particles and a base liquid, the base liquid may be deionized water, and the phase change microcapsule particles may be paraffin-melamine resin particles; the technical core of the phase-change microcapsule particles is that the core material phase-change material is utilized to realize the storage and release of heat; the phase-change material can absorb or release a large amount of phase-change latent heat when the phase-change material is in phase change, meanwhile, the temperature is kept unchanged, when the phase-change material is converted from a solid state to a liquid state, a large amount of heat is absorbed and stored, and when the phase-change material is converted from the liquid state to the solid state, the absorbed heat is released, so that the phase-change material has the characteristics of high energy storage density, constant phase-change temperature and cyclic use.
Compared with the common single-phase heat transfer fluid, the latent heat type functional fluid has large apparent specific heat at a phase change temperature section, and the heat transfer capacity between the heat transfer fluid and the wall surface of a flow channel can be obviously improved due to the influence of micron phase change particles on the flow and heat transfer of the fluid, so that the latent heat type functional fluid not only can be used as a high-efficiency heat transfer medium, the effective specific heat and the heat transfer performance of the fluid are greatly improved, but also the integration of energy storage and transportation media can be realized, and the contradiction of mismatching of energy supply and energy demand in time and strength is relieved.
A pipeline on one side of the liquid storage tank 108 is connected with a loop to form a heat storage circulating pipeline, and a third electromagnetic valve 110, a second circulating pump 109, a compressor collecting pipe 114 and a fourth electromagnetic valve 111 are arranged on the pipeline of the heat storage circulating pipeline; the other side of the liquid storage tank 108 is connected with a loop through a pipeline to form a defrosting circulation pipeline, and a first electromagnetic valve 103, an evaporator collecting pipe 115, a first circulation pump 104 and a second electromagnetic valve 105 are arranged on the pipeline of the defrosting circulation pipeline; the latent heat type functional fluid collects and stores waste heat generated by the compressor 112, flows back to the liquid storage tank 108 and is transmitted to the evaporator 102 from the liquid storage tank 108 through the pipeline; the compressor header 114 is gathered and wound around the compressor 112 to form a network of pipes where the latent heat type functional fluid exchanges heat with the compressor 112; the evaporator collecting pipe 115 is wound around the evaporator 102 to form a pipe network where the latent heat type functional fluid exchanges heat with the evaporator 102, and collects and stores cold generated by the evaporator 102 and flows to the liquid storage tank 108.
The first electromagnetic valve 103, the second electromagnetic valve 105, the third electromagnetic valve 110 and the fourth electromagnetic valve 111 are connected with a control system 101 through electric wires; the evaporator 102 is provided with three humidity sensors, the three humidity sensors are respectively arranged at the upper part, the middle part and the lower part of the evaporator 102, the humidity sensors are electrically connected with the control system 101, the humidity sensors monitor the air humidity, the relative humidity and the dry-bulb humidity near the surface of the evaporator 102 in real time, and an upper limit critical value and a lower limit critical value are set.
As shown in fig. 2 to 3, an embodiment of the present invention provides a method for defrosting a refrigerator by recovering waste heat using a latent heat type functional fluid, including the following steps:
firstly, the compressor 112 works, the first electromagnetic valve 103 and the second electromagnetic valve 105 are closed, the third electromagnetic valve 110 and the fourth electromagnetic valve 111 are opened, the heat storage circulation works, the second circulating pump 109 works to pump and circulate the latent heat type functional fluid in the liquid storage tank 108, the latent heat type functional fluid is conveyed through a pipeline and flows back to the liquid storage tank 108 after fully exchanging heat with the compressor 112 through a pipe network formed by a compressor collecting pipe 114, absorbed waste heat is stored in the latent heat type functional fluid, and the temperature of liquid in the liquid storage tank 108 rises.
In the second step, when the evaporator 102 starts to work, the temperature of the surface of the evaporator 102 starts to decrease, moisture in the air starts to freeze and frost on the surface of the evaporator 102, and the humidity sensor arranged on the surface of the evaporator monitors that the humidity reaches a set lower limit threshold value, and transmits a signal to the control system 101.
Thirdly, the control system 101 receives a signal to control the first electromagnetic valve 103, the second electromagnetic valve 105, the third electromagnetic valve 110 and the fourth electromagnetic valve 111 to be opened, the first circulation pump 104 starts to work, the defrosting cycle is started, latent heat type functional fluid which stores heat in the liquid storage tank 108 is conveyed to a pipe network which is formed by the evaporator collecting pipe 115 and is close to the evaporator 102 through a pipeline, latent heat is released near the surface of the evaporator 102, defrosting is started, and the latent heat type functional fluid which is cooled after the temperature is reduced is pumped back to the liquid storage tank 108 through the first circulation pump 104.
Fourthly, the humidity on the surface of the evaporator 102 rises, a humidity sensor arranged on the surface of the evaporator 102 monitors that the humidity reaches a set upper limit critical value, a signal is transmitted to the control system 101, the control system 101 receives the signal and controls the first electromagnetic valve 103 and the second electromagnetic valve 105 to be closed, the first circulating pump 104 stops working, and a defrosting cycle is finished.
When the refrigerator normally works, the heat storage cycle is circulated first, the defrosting cycle is in a closed state at the moment, and when the control system 101 opens all the electromagnetic valves, the first circulating pump 104 starts to work, and the defrosting cycle is started at the moment.
The heat storage cycle collects and stores the waste heat of the compressor 112 and defrosts by using the waste heat through the defrosting cycle, the whole process saves energy, does not waste energy consumption, is low-carbon and environment-friendly, and the heat storage cycle and the defrosting cycle are controlled by the control system 101, so that the operation is stable and the regulation and control are intelligent; the method adopts a novel working medium to effectively store energy, and the heat exchange is more efficient; the defrosting method of the invention can achieve the real frostless purpose by setting the upper limit and the lower limit of the humidity, so that the surface of the evaporator 102 can not generate frost layer.
The working process of the refrigerator defrosting method for recovering waste heat by using the latent heat type functional fluid comprises the following steps:
s1, the refrigerator works normally, the compressor works, the first electromagnetic valve and the second electromagnetic valve are closed at the moment, the third electromagnetic valve and the fourth electromagnetic valve are opened at the moment, the heat storage cycle works at the moment, the defrosting cycle is closed, the second circulating pump works to pump and circulate the latent heat type functional fluid in the liquid storage tank, the latent heat type functional fluid is conveyed through a pipeline, heat is fully exchanged with the compressor through a pipe network formed by a compressor gathering pipe and then flows back to the liquid storage tank, the absorbed waste heat is stored in the latent heat type functional fluid, and the temperature of liquid in the liquid storage tank is increased.
And S2, when the evaporator starts to work, the surface temperature of the evaporator starts to decrease, moisture in the air starts to be solidified and frosted on the surface of the evaporator, and a humidity sensor arranged on the surface of the evaporator monitors that the humidity reaches a set lower limit critical value and transmits a signal to a control system.
S3, the control system receives the signal, controls the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve to open, the first circulating pump starts to work, at the moment, the defrosting cycle is started, the latent heat type functional fluid which stores heat in the liquid storage tank is conveyed to a pipe network which is formed by an evaporator gathering pipe and is near the evaporator through a pipeline, latent heat is released near the surface of the evaporator, defrosting is started, and the latent heat type functional fluid which is cooled after the temperature is reduced is pumped to the liquid storage tank through the first circulating pump.
And S4, the surface humidity of the evaporator rises, the humidity sensor arranged on the surface of the evaporator monitors that the humidity reaches a set upper limit critical value, a signal is transmitted to the control system, the control system receives the signal, the first electromagnetic valve and the second electromagnetic valve are controlled to be closed, the first circulating pump stops working, and a defrosting cycle is finished.
The following points need to be explained:
(1) the drawings of the embodiments of the invention only relate to the structures related to the embodiments of the invention, and other structures can refer to common designs.
(2) The thickness of layers or regions in the figures used to describe embodiments of the invention may be exaggerated or reduced for clarity, i.e., the figures are not drawn on a true scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
(3) Without conflict, embodiments of the present invention and features of the embodiments may be combined with each other to arrive at new embodiments.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (9)
1. A refrigerator defrosting system for recovering waste heat by using latent heat type functional fluid comprises a compressor and an evaporator and is characterized by comprising a liquid storage tank, wherein the liquid storage tank is arranged between the compressor and the evaporator, one side of the liquid storage tank is connected by a pipeline to form a heat storage circulating pipeline of a loop, and a circulating pump II and a compressor collecting pipe are arranged on the pipeline of the heat storage circulating pipeline; the other side of the liquid storage tank is connected with a defrosting circulation pipeline forming a loop through a pipeline, and an evaporator collecting pipe and a first circulation pump are arranged on the pipeline of the defrosting circulation pipeline;
the liquid storage tank is filled with latent heat type functional fluid, the latent heat type functional fluid can flow with the defrosting circulation pipeline in the heat storage circulation pipeline, the compressor collecting pipe is gathered and wound on a refrigerator compressor to form a pipe network, and the evaporator collecting pipe is gathered and wound on an evaporator to form the pipe network.
2. The defrosting system for a refrigerator using a latent heat type functional fluid for recovering waste heat according to claim 1, wherein a third solenoid valve and a fourth solenoid valve are provided on the heat storage circulating line; the defrosting circulation pipeline is provided with a first electromagnetic valve and a second electromagnetic valve; the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are all connected with a control system through electric wires.
3. The system according to claim 1, wherein the evaporator has three humidity sensors disposed at the upper, middle and lower portions thereof, and the humidity sensors are electrically connected to the control system.
4. The system of claim 3, wherein the humidity sensor monitors the humidity of the air near the surface of the evaporator in real time and is preset with a lower threshold and an upper threshold.
5. The system of claim 1, wherein the latent heat functional fluid comprises phase change microcapsule particles and a base fluid, the base fluid is deionized water, and the phase change microcapsule particles are paraffin-melamine resin particles.
6. A refrigerator for recovering waste heat by using a latent heat type functional fluid, characterized in that the refrigerator comprises the defrosting system for a refrigerator for recovering waste heat by using a latent heat type functional fluid according to any one of claims 1 to 5, the evaporator and the compressor are connected by a capillary network and a pipeline, and the pipeline is provided with a condenser and a drying filter.
7. A method for defrosting a refrigerator by recovering waste heat using a latent heat type functional fluid, the method comprising the steps of using the refrigerator for recovering waste heat using a latent heat type functional fluid according to claim 6 and the defrosting system for a refrigerator for recovering waste heat using a latent heat type functional fluid according to any one of claims 1 to 5, the method comprising:
s1: the compressor works, the first electromagnetic valve and the second electromagnetic valve are closed, the third electromagnetic valve and the fourth electromagnetic valve are opened, the second circulating pump works to pump and circulate the latent heat type functional fluid in the liquid storage tank, the latent heat type functional fluid is conveyed through a pipeline and fully exchanges heat with the compressor through a pipe network formed by the compressor gathering pipe and then flows back to the liquid storage tank, the absorbed waste heat is stored in the latent heat type functional fluid, and the temperature of liquid in the liquid storage tank is increased;
s2: when the evaporator starts to work, the surface temperature of the evaporator starts to decrease, moisture in the air starts to be solidified and frosted on the surface of the evaporator, the humidity sensor arranged on the surface of the evaporator monitors that the humidity reaches a set lower limit critical value, and a signal is transmitted to the control system;
s3: the control system receives signals and controls the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve to be opened, the circulating pump starts to work, latent heat type functional fluid which stores heat in the liquid storage tank is conveyed to a pipe network which is formed by an evaporator gathering pipe and is close to the evaporator through a pipeline, latent heat is released near the surface of the evaporator, defrosting is started, and the latent heat type functional fluid which is cooled after the temperature is reduced is pumped back to the liquid storage tank through the first circulating pump;
s4: and when the surface humidity of the evaporator rises, a humidity sensor arranged on the surface of the evaporator monitors that the humidity reaches a set upper limit critical value, a signal is transmitted to the control system, the control system receives the signal and controls the first electromagnetic valve and the second electromagnetic valve to be closed, the first circulating pump stops working, and a defrosting cycle is finished.
8. The method as claimed in claim 7, wherein the heat storage cycle is first circulated during normal operation of the refrigerator, and the defrosting cycle is closed, and when the control system turns on all the solenoid valves, the circulating pump starts to operate, and the defrosting cycle is turned on.
9. The method for defrosting a refrigerator using latent heat type functional fluid for recovering waste heat according to claim 7, wherein the humidity sensor can accurately detect the relative humidity of the measured point and the dry bulb humidity.
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| CN202210249763.4A CN114646166A (en) | 2022-03-14 | 2022-03-14 | Refrigerator for recovering waste heat by using latent heat type functional fluid, defrosting system and defrosting method |
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| CN107917570A (en) * | 2016-10-11 | 2018-04-17 | 松下电器产业株式会社 | Refrigerator and its control method |
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2022
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|---|---|---|---|---|
| JP2000304415A (en) * | 1999-04-23 | 2000-11-02 | Lg Electronics Inc | Defrosting device for refrigerator |
| US20050081548A1 (en) * | 2002-08-06 | 2005-04-21 | Samsung Electronics Co., Ltd. | Defroster and refrigerator employing the same |
| CN105004127A (en) * | 2015-07-30 | 2015-10-28 | 青岛海尔股份有限公司 | Refrigerator and defrosting control method thereof |
| CN105674681A (en) * | 2016-01-20 | 2016-06-15 | 青岛海尔股份有限公司 | Air-cooling refrigerator and defrosting control method for evaporator of air-cooling refrigerator |
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