CN111536720A - Defrosting method and device adopting secondary condensation of refrigerant - Google Patents
Defrosting method and device adopting secondary condensation of refrigerant Download PDFInfo
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- CN111536720A CN111536720A CN202010458340.4A CN202010458340A CN111536720A CN 111536720 A CN111536720 A CN 111536720A CN 202010458340 A CN202010458340 A CN 202010458340A CN 111536720 A CN111536720 A CN 111536720A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 169
- 238000010257 thawing Methods 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000009833 condensation Methods 0.000 title claims abstract description 37
- 230000005494 condensation Effects 0.000 title claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 84
- 238000001704 evaporation Methods 0.000 claims abstract description 66
- 230000008020 evaporation Effects 0.000 claims abstract description 62
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 238000005057 refrigeration Methods 0.000 claims description 58
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 238000004781 supercooling Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000006467 substitution reaction 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
- 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
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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Abstract
The invention discloses a defrosting method and a defrosting device adopting secondary condensation of a refrigerant, wherein the defrosting method comprises the following steps: a liquid refrigerant formed after the condenser is condensed is shunted to the primary evaporation device through a shunt pipeline; the liquid refrigerant is evaporated and absorbs heat in the primary evaporation device and is converted into a vapor-liquid mixture refrigerant or a gas refrigerant; the vapor-liquid mixture refrigerant or the gas refrigerant is conveyed to an evaporator to be defrosted through a defrosting pipeline, and the mixture refrigerant or the gas refrigerant is used as a defrosting medium for releasing heat to melt frosting on the evaporator. The invention takes the gas-liquid mixture refrigerant or the gas refrigerant formed after the liquid refrigerant is evaporated and absorbs heat in the primary evaporation device as the defrosting medium to melt the frost on the evaporator, thereby realizing the output of the refrigerating capacity of two times and effectively improving the refrigerating capacity of the refrigerating system.
Description
Technical Field
The invention relates to a defrosting technology of a refrigerating system, in particular to a defrosting method and a defrosting device adopting secondary condensation of a refrigerant.
Background
In the operation process of the refrigeration system, when the evaporation temperature is lower than 0 ℃, the phenomenon of frosting can occur on the evaporator, so that the heat exchange efficiency and the refrigeration efficiency are reduced, and defrosting treatment is required.
The existing defrosting modes mainly comprise refrigerant defrosting and non-refrigerant defrosting. The refrigerant defrosting mainly comprises superheated gas defrosting, liquid defrosting and gas-liquid mixed defrosting. The existing method for obtaining the defrosting refrigerant by compressing and then depressurizing increases energy consumption. The defrosting is carried out by mixing liquid refrigerant or vapor and liquid for defrosting, although the same problem as that of superheated gas defrosting does not exist, the specific enthalpy of defrosting is small, the required flow is large, the defrosting efficiency is low, the time required for single defrosting is long, and the defrosting time interval is short. The defrosting medium for liquid defrosting is mainly a high-pressure liquid refrigerant formed by condensing gas through a condenser; the vapor-liquid mixed defrosting refrigerant is directly throttled by the liquid refrigerant, and is not subjected to heating treatment, and has equal enthalpy with the high-pressure liquid refrigerant of the liquid defrosting only for reducing the temperature and the pressure of defrosting.
Disclosure of Invention
The invention aims to overcome the existing problems and provides a defrosting method adopting secondary condensation of a refrigerant, and the defrosting method adopts a gas-liquid mixture refrigerant or a gas refrigerant formed after a liquid refrigerant is evaporated and absorbs heat in a primary evaporation device as a defrosting medium to melt frosting on an evaporator, thereby realizing output of twice refrigerating capacity and effectively improving the refrigerating capacity of a refrigerating system.
Another object of the present invention is to provide a defrosting apparatus using secondary condensation of a refrigerant.
The purpose of the invention is realized by the following technical scheme:
a defrosting method adopting secondary condensation of refrigerant comprises the following steps:
a liquid refrigerant formed after the condenser is condensed is shunted to the primary evaporation device through a shunt pipeline; the liquid refrigerant is evaporated and absorbs heat in the primary evaporation device and is converted into a vapor-liquid mixture refrigerant or a gas refrigerant; and delivering the vapor-liquid mixture refrigerant or the gas refrigerant to an evaporator to be defrosted through a defrosting pipeline, wherein the vapor-liquid mixture refrigerant or the gas refrigerant is used as a defrosting medium to release heat to melt frosting on the evaporator.
The defrosting method adopting the secondary condensation of the refrigerant has the working principle that:
when the refrigeration system works, the compressor compresses low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas refrigerant through compression work, the high-temperature and high-pressure gas refrigerant is converted into liquid refrigerant or gas refrigerant after being condensed by the condenser, and then the liquid refrigerant is conveyed to the refrigeration evaporator through the refrigeration main pipeline. In the process, the liquid refrigerant formed after condensation of the condenser is shunted to the primary evaporation device through the shunt pipeline, and in the primary evaporation device, the liquid refrigerant is converted into a vapor-liquid mixture refrigerant or a gas refrigerant after evaporation and heat absorption. Further, after the refrigerant is condensed by the condenser (namely, the refrigerant serving as a defrosting medium is subjected to primary condensation), the part of the refrigerant enters the primary evaporation device to be evaporated and absorb heat, the main refrigeration pipeline is supercooled or a specific environment is cooled, the first evaporation and heat absorption of the refrigerant serving as the defrosting medium are realized, and a primary refrigeration effect is generated.
The vapor-liquid mixture refrigerant or the gas refrigerant is conveyed to an evaporator to be defrosted through a defrosting pipeline, and the mixture refrigerant or the gas refrigerant is used as a defrosting medium for releasing heat to melt frosting on the evaporator. In the defrosting process, a refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalent to secondary improvement of heat absorption capacity), is conveyed into a refrigerating evaporator, is subjected to secondary evaporation, generates a secondary refrigerating effect, and realizes output of two refrigerating capacities.
In a preferred embodiment of the present invention, in the primary evaporation device, the liquid refrigerant is evaporated to absorb heat, and the liquid refrigerant in the main refrigeration pipeline is subcooled or cools a predetermined refrigeration environment. Specifically, when the liquid refrigerant in the refrigeration main pipe is supercooled, that is, the specific enthalpy of the liquid refrigerant to be sent to the refrigeration evaporator is made lower (lower temperature), to improve the heat absorption (refrigeration) capacity. When the refrigerant serving as the defrosting medium is evaporated for the first time to absorb heat for cooling the set refrigeration environment, the energy use efficiency can be improved.
In a preferred embodiment of the present invention, before defrosting, the number of times of evaporating the refrigerant as the defrosting medium is several times, that is, not limited to one time, and may be several times, and the specific number of times may be flexibly selected according to the actual application.
In a preferred embodiment of the present invention, at least one of the evaporators is refrigerating during defrosting operation.
In a preferred aspect of the present invention, after the defrosting operation is completed, the refrigerant is sent downward to the evaporator that is performing the cooling operation to be evaporated. In the later evaporation process, the characteristics of the vapor-liquid mixture are utilized: the heat absorption capacity is equal to the heat release capacity, and even if heat is leaked to the outside in the defrosting process, the heat can be absorbed back equivalently through subsequent evaporation heat absorption, so that the refrigerating efficiency of the refrigerating system cannot be reduced.
In a preferred embodiment of the present invention, the enthalpy of the vapor-liquid mixture refrigerant is greater than the enthalpy of the gas compressed by the compressor and discharged after the gas is completely condensed, and is less than or equal to the enthalpy of the refrigerant as a defrosting medium after the refrigerant is evaporated for cooling.
In a preferred embodiment of the present invention, the evaporation temperature of the refrigerant is higher than the frost melting temperature of the evaporator to be defrosted and lower than the condensation temperature of the refrigeration system.
Preferably, when the frosting component is ice, the melting temperature is 0 ℃.
A defrosting device adopting secondary condensation of a refrigerant is integrated in a refrigerating system and comprises a primary evaporation device, a shunt pipeline and a defrosting pipeline, wherein the primary evaporation device is used for evaporating and absorbing heat for a liquid refrigerant condensed by a condenser, the shunt pipeline is used for conveying the liquid refrigerant in a main refrigeration pipeline to the primary evaporation device, and the defrosting pipeline is used for conveying a vapor-liquid mixture refrigerant or a gas refrigerant formed by evaporation and heat absorption to an evaporator to be defrosted;
the head end of the defrosting pipeline is connected with the outlet of the primary evaporation device, and the tail end of the defrosting pipeline is connected with the inlet of the evaporator to be defrosted.
In a preferred embodiment of the invention, the outlet of the evaporator to be defrosted is connected to the head end of a secondary evaporation pipe, the end of which is connected to the inlet of the evaporator being refrigerated.
In a preferred embodiment of the present invention, the primary evaporation device includes a primary expansion valve and a primary evaporation heat exchanger, and the primary expansion valve is disposed on the diversion pipeline.
Preferably, the primary evaporation heat exchanger is arranged outside a main refrigeration pipeline for conveying liquid refrigerant and used for supercooling the refrigerant in the main refrigeration pipeline and improving the refrigeration capacity of the refrigerant.
In a preferred embodiment of the present invention, the defrosting pipe is provided with a pressure controller for adjusting the pressure of the defrosting medium in the pipe.
In a preferred embodiment of the present invention, the defrosting pipe is provided with a temperature sensor for detecting a temperature of the defrosting medium in the pipe.
Compared with the prior art, the invention has the following beneficial effects:
1. after being condensed by the condenser, the refrigerant serving as a defrosting medium is subjected to primary condensation, and the refrigerating capacity is obtained. Part of the liquid refrigerant is shunted into the primary evaporation device, and the liquid refrigerant is evaporated for the first time to absorb heat, so that the primary refrigeration is completed. In the defrosting process, the refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalent to the secondary improvement of the heat absorption capacity), is conveyed to the refrigerated evaporator and is subjected to secondary evaporation to generate a secondary refrigeration effect, so that the output of the secondary refrigeration capacity is realized, and the refrigeration capacity of the refrigeration system is effectively improved.
2. Compared with the traditional superheated gas defrosting mode (the gas taking pipe orifice is arranged on a main refrigerating pipe between the oil separator and the condenser), the refrigerant liquid taking pipe orifice can be arranged on a high-pressure liquid pipe between the condenser and the evaporator and is closer to a cooled environment, the length of the pipe is effectively shortened, and the using amount of the pipe is reduced.
Drawings
FIG. 1 is a pressure-enthalpy diagram of one embodiment wherein the numbers indicate the location of the refrigerant, 1 indicates the compressor inlet, 2 indicates the condenser inlet, 3 indicates the expansion valve inlet, 4 indicates the inlet of the evaporator for cooling, 5 indicates the primary evaporative heat exchanger inlet, 6 indicates the inlet of the evaporator for defrosting, and 7 indicates the outlet of the evaporator for defrosting; wherein, the circulation path of the refrigerant as the defrosting medium is as follows: 1-2-3-5-6-7-4.
Figure 2 is a pressure enthalpy diagram for another embodiment.
When neglecting the pipe pressure loss, the pressures at points 5, 6, and 7 should be the same, but for clarity of the entire flow of defrosting refrigerant, the pressures at 5, 6, and 7 are slightly differentiated in fig. 1 and 2.
Fig. 3 is a schematic structural diagram of an embodiment of a defrosting method using secondary condensation of refrigerant applied to a refrigeration system in the present invention, wherein a dotted line represents a defrosting pipe.
Detailed Description
In order to make those skilled in the art understand the technical solutions of the present invention well, the following description of the present invention is provided with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 3, the defrosting apparatus using secondary condensation of refrigerant in the present embodiment is integrated in a refrigeration system, and includes a primary evaporation apparatus for evaporating and absorbing heat from a liquid refrigerant condensed by a condenser 1, a branch pipe 2 for conveying the liquid refrigerant in a main refrigeration pipe 3 to the primary evaporation apparatus, and a defrosting pipe 3 for conveying a vapor-liquid mixture refrigerant formed by evaporation and absorption to an evaporator 5(a) to be defrosted, wherein a head end of the branch pipe 2 is connected by the main refrigeration pipe 3 for conveying the liquid refrigerant, and a tail end of the branch pipe is connected to an inlet of the primary evaporation apparatus, a head end of the defrosting pipe 3 is connected to an outlet of the primary evaporation apparatus, and a tail end of the defrosting pipe is connected to an inlet of the evaporator 5(a) to be defrosted.
Referring to fig. 3, the outlet of the evaporator 5(a) to be defrosted is connected to the head end of a secondary evaporation pipe, the tail end of which is connected to the inlet of the evaporator 5(b) being refrigerated. Referring to fig. 3, the primary evaporation apparatus includes a primary expansion valve 6 and a primary evaporation heat exchanger 7, and the primary expansion valve 6 is disposed on the diversion conduit 2. Further, the primary evaporation heat exchanger 7 is arranged outside the main refrigeration pipeline 3 for conveying liquid refrigerant, and is used for supercooling the refrigerant in the main refrigeration pipeline 3 and improving the refrigeration capacity of the refrigerant.
Specifically, the defrosting pipe 3 is provided with a pressure controller for adjusting the pressure of the defrosting medium in the pipe and a temperature sensor for detecting the temperature of the defrosting medium in the pipe.
Referring to fig. 1 and 3, the defrosting method using secondary condensation of the refrigerant in the present embodiment includes the following steps:
condensing the high-temperature and high-pressure gas refrigerant into a liquid refrigerant by a condenser 1 of the refrigeration system, as in process 2-3; part of liquid refrigerant (most of the liquid refrigerant is used for normal refrigeration work, and the rest of the liquid refrigerant is used for defrosting of an evaporator) formed after condensation of the condenser 1 is shunted to a primary evaporation device through a shunt pipeline 2, and in the primary evaporation device, the liquid refrigerant is throttled and evaporated to enable the liquid refrigerant in a main refrigeration pipeline 3 to be supercooled; after supercooling, the liquid refrigerant absorbs heat and is converted into a vapor-liquid mixture refrigerant, as in process 3-6; the gas-liquid mixture refrigerant is conveyed to the evaporator 5(a) to be defrosted through the defrosting pipeline 4, and the mixture refrigerant is used as a defrosting medium for releasing heat to melt frost on the evaporator, as in the process 6-7. Further, in the present embodiment, the circulation path of the refrigerant as the defrosting medium is: 1-2-3-5-6-7-4; of course, the point 7 and the point 4 may coincide, that is, the defrosted refrigerant is directly used in other refrigeration occasions without throttling.
Before defrosting, the evaporation frequency of the refrigerant as a defrosting medium is several times, namely, the refrigerant is not limited to one time, and can be multiple times, and the specific frequency can be flexibly selected according to practical application.
In the defrosting operation, at least one evaporator is refrigerating, and in this embodiment, two evaporators switched to operate in turn are provided, but of course, the number of the evaporators may be three, four or more. After the defrosting operation is finished, the refrigerant is sent downward to the evaporator 5(b) which is performing cooling to be evaporated, as in process 4-1.
Specifically, in the present embodiment, the evaporation temperature of the refrigerant is higher than the melting temperature of frost formation of the evaporator 5(a) to be defrosted and lower than the condensation temperature of the refrigeration system. Wherein, when the frosting component is ice, the melting temperature is 0 ℃.
Referring to fig. 1 and 3, the defrosting method using secondary condensation of refrigerant in the present embodiment operates on the principle that:
when the refrigeration system works, the compressor 8 compresses low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas refrigerant through compression work, the high-temperature and high-pressure gas refrigerant is converted into liquid refrigerant after being condensed by the condenser 1, and then the liquid refrigerant is conveyed to the refrigeration evaporator through the refrigeration main pipeline 3. In the process, the liquid refrigerant formed after the condenser 1 is condensed is shunted into the primary evaporation device through the shunt pipe 2, and the primary evaporation device utilizes part of the liquid refrigerant to carry out supercooling on the liquid refrigerant in the main refrigeration pipe 3, so that the specific enthalpy of the liquid refrigerant to be conveyed to the refrigeration evaporator is lower (the temperature is lower) to improve the heat absorption (refrigeration) capacity of the primary evaporation device.
In the supercooling process, the liquid refrigerant is evaporated and absorbs heat to be converted into a vapor-liquid mixture refrigerant, and then the vapor-liquid mixture refrigerant is conveyed to the evaporator 5(a) to be defrosted through the defrosting pipeline 4, and the mixture refrigerant is used as a defrosting medium for releasing heat to melt frosting on the evaporator.
Specifically, referring to the figure 1, the abscissa represents the magnitude of the enthalpy, the ordinate represents the magnitude of the pressure, the curve represents the saturation curve, the medium in the region enclosed by the curve is in a vapor-liquid mixed state, the left side is in a liquid state, and the right side is in a gaseous state. Wherein, the 1-2 process is a process that the compressor 8 compresses the gas, so that the low-temperature and low-pressure gas is changed into high-temperature and high-pressure gas, the 2-3 process is an isobaric cooling process, the 3-4 process is an isenthalpic pressure reduction process, and the 4-1 process is an isobaric heat absorption process, namely representing the heat absorption capacity of the refrigeration medium.
2-3*The refrigerant contains compression work and condensation heat, and the heat release is completed in the condenser of the traditional refrigeration system if the refrigerant is to be positioned at 2-3*The defrosting medium is used for defrosting under the state, namely an evaporator to be defrosted is a condenser of a traditional refrigerating system, and compression work or condensation heat is transferred to air, so that the refrigerating efficiency of the refrigerating system is reduced. On the contrary, although at 3*The liquid in the state of-3 does not contain compression work and condensation heat, has small enthalpy value, is easy to control, has the capacity of releasing heat equal to the capacity of absorbing heat, but has large required flow, low defrosting efficiency and short defrosting time interval.
Further, after the refrigerant is condensed by the condenser 1 (equivalent to the refrigerant serving as the defrosting medium is subjected to primary condensation), the part of the refrigerant enters the primary evaporation device to be evaporated and absorb heat, and is subcooled in the main refrigeration pipeline 3, so that the first evaporation and heat absorption of the refrigerant serving as the defrosting medium are realized, and the primary refrigeration effect is generated. In the defrosting process, the refrigerant serving as a defrosting medium is subjected to secondary condensation (equivalent to secondary improvement of heat absorption capacity), and is conveyed to the evaporator 5(b) for refrigeration to perform secondary evaporation, so that a secondary refrigeration effect is generated, and the output of two refrigeration amounts is realized.
Example 2
Referring to fig. 2, unlike embodiment 1, in the present embodiment, after being supercooled, the liquid refrigerant is converted into a gas refrigerant by heat absorption, as in processes 3 to 6; the gas-liquid mixture refrigerant is conveyed to the evaporator 5(a) to be defrosted through the defrosting pipe 4, and the gas refrigerant is used as a defrosting medium for releasing heat to melt frost on the evaporator, as in the process 6-7.
Example 3
Unlike embodiment 1, when the refrigerant serving as the defrosting medium in this embodiment is first evaporated to absorb heat for cooling the set cooling environment, the energy use efficiency can be improved.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (10)
1. A defrosting method adopting secondary condensation of a refrigerant is characterized by comprising the following steps:
a liquid refrigerant formed after the condenser is condensed is shunted to the primary evaporation device through a shunt pipeline; the liquid refrigerant is evaporated and absorbs heat in the primary evaporation device and is converted into a vapor-liquid mixture refrigerant or a gas refrigerant; and delivering the vapor-liquid mixture refrigerant or the gas refrigerant to an evaporator to be defrosted through a defrosting pipeline, wherein the vapor-liquid mixture refrigerant or the gas refrigerant is used as a defrosting medium to release heat to melt frosting on the evaporator.
2. The defrosting method using secondary condensation of refrigerant according to claim 1, wherein in the primary evaporation device, the liquid refrigerant is evaporated to absorb heat, and the liquid refrigerant in the main refrigeration pipeline is subcooled or the set refrigeration environment is cooled.
3. A defrosting method using secondary condensation of refrigerant according to claim 1 or 2, wherein the number of times of evaporation of refrigerant as defrosting medium is at least one before defrosting.
4. A defrosting method using secondary condensation of refrigerant according to claim 1 or 2, wherein at least one evaporator is refrigerating in defrosting operation.
5. The defrosting method by secondary condensation of refrigerant according to claim 4, wherein after the defrosting operation is finished, the refrigerant is sent downwards to an evaporator which is performing the refrigeration operation for evaporation, or is sent to a liquid storage container for storage.
6. The defrosting method using secondary condensation of refrigerant according to claim 1 or 5, wherein the evaporation temperature of the refrigerant is higher than the melting temperature of frosting of the evaporator to be defrosted and lower than the condensation temperature of the refrigeration system.
7. An apparatus for applying the defrosting method by secondary condensation of refrigerant according to any one of claims 1 to 6, which is integrated in a refrigeration system, and comprises a primary evaporation device for evaporating and absorbing heat of the liquid refrigerant condensed by the condenser, a branch pipe for delivering the liquid refrigerant in the main refrigeration pipe to the primary evaporation device, and a defrosting pipe for delivering the vapor-liquid mixture refrigerant or gas refrigerant formed by evaporation and absorption of heat to the evaporator to be defrosted, wherein the head end of the branch pipe is connected by the main refrigeration pipe for delivering the liquid refrigerant, and the tail end of the branch pipe is connected to the inlet of the primary evaporation device;
the head end of the defrosting pipeline is connected with the outlet of the primary evaporation device, and the tail end of the defrosting pipeline is connected with the inlet of the evaporator to be defrosted.
8. The defrosting apparatus using secondary condensation of refrigerant according to claim 7 wherein the outlet of the evaporator to be defrosted is connected to the head end of a secondary evaporation pipe, the tail end of which is connected to the inlet of the evaporator being cooled.
9. The defrosting apparatus using secondary condensation of a refrigerant according to claim 7, wherein the primary evaporation apparatus includes a primary expansion valve and a primary evaporation heat exchanger, the primary expansion valve being provided on the diverging pipe;
the primary evaporation heat exchanger is arranged on the outer side of a main refrigeration pipeline for conveying liquid refrigerant and used for supercooling the refrigerant in the main refrigeration pipeline and improving the refrigeration capacity of the refrigerant.
10. The defrosting apparatus using secondary condensation of refrigerant according to claim 7 wherein the defrosting duct is provided with a pressure controller for adjusting a pressure of the defrosting medium in the duct and a temperature sensor for detecting a temperature of the defrosting medium in the duct.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116222041A (en) * | 2023-03-20 | 2023-06-06 | 广东省现代农业装备研究所 | Secondary condensation defrosting medium flow control method for refrigeration system |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005018125A1 (en) * | 2005-04-20 | 2006-10-26 | Bernhard Wenzel | A method for defrosting evaporators in heat pump systems has each evaporator provided with a similar tubular defrost unit by which the evaporators are operated alternately |
| CN201034400Y (en) * | 2007-05-31 | 2008-03-12 | 广州立昆空调科技有限公司 | Defrosting device of air source heat pump water heater |
| CN201149399Y (en) * | 2008-07-08 | 2008-11-12 | 西安交通大学 | Refrigeration and defrosting system |
| JP2013137123A (en) * | 2011-12-28 | 2013-07-11 | Mitsubishi Electric Corp | Refrigerating apparatus |
| CN204786911U (en) * | 2015-06-11 | 2015-11-18 | 泰豪科技股份有限公司 | Novel defrosting low temperature dehumidifier |
| CN108458511A (en) * | 2018-04-19 | 2018-08-28 | 天津商业大学 | It is a kind of to be in direct contact condensation refrigerating system with hot gas defrosting |
| CN109469990A (en) * | 2018-10-08 | 2019-03-15 | 东南大学 | The air source heat pump and its working method with disengaged defroster based on super-hydrophobic finned heat exchanger |
| CN110762872A (en) * | 2019-11-14 | 2020-02-07 | 天津商业大学 | Air cooler system capable of alternately defrosting |
| CN212274330U (en) * | 2020-05-26 | 2021-01-01 | 广东省现代农业装备研究所 | Defrosting device adopting secondary condensation of refrigerant |
-
2020
- 2020-05-26 CN CN202010458340.4A patent/CN111536720A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005018125A1 (en) * | 2005-04-20 | 2006-10-26 | Bernhard Wenzel | A method for defrosting evaporators in heat pump systems has each evaporator provided with a similar tubular defrost unit by which the evaporators are operated alternately |
| CN201034400Y (en) * | 2007-05-31 | 2008-03-12 | 广州立昆空调科技有限公司 | Defrosting device of air source heat pump water heater |
| CN201149399Y (en) * | 2008-07-08 | 2008-11-12 | 西安交通大学 | Refrigeration and defrosting system |
| JP2013137123A (en) * | 2011-12-28 | 2013-07-11 | Mitsubishi Electric Corp | Refrigerating apparatus |
| CN204786911U (en) * | 2015-06-11 | 2015-11-18 | 泰豪科技股份有限公司 | Novel defrosting low temperature dehumidifier |
| CN108458511A (en) * | 2018-04-19 | 2018-08-28 | 天津商业大学 | It is a kind of to be in direct contact condensation refrigerating system with hot gas defrosting |
| CN109469990A (en) * | 2018-10-08 | 2019-03-15 | 东南大学 | The air source heat pump and its working method with disengaged defroster based on super-hydrophobic finned heat exchanger |
| CN110762872A (en) * | 2019-11-14 | 2020-02-07 | 天津商业大学 | Air cooler system capable of alternately defrosting |
| CN212274330U (en) * | 2020-05-26 | 2021-01-01 | 广东省现代农业装备研究所 | Defrosting device adopting secondary condensation of refrigerant |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116222041A (en) * | 2023-03-20 | 2023-06-06 | 广东省现代农业装备研究所 | Secondary condensation defrosting medium flow control method for refrigeration system |
| CN116222041B (en) * | 2023-03-20 | 2024-02-02 | 广东省现代农业装备研究所 | Secondary condensation defrosting medium flow control method for refrigeration system |
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