CN110726271A - Efficient chassis icing-resistant finned heat exchanger and working method thereof - Google Patents
Efficient chassis icing-resistant finned heat exchanger and working method thereof Download PDFInfo
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- CN110726271A CN110726271A CN201911093115.9A CN201911093115A CN110726271A CN 110726271 A CN110726271 A CN 110726271A CN 201911093115 A CN201911093115 A CN 201911093115A CN 110726271 A CN110726271 A CN 110726271A
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- fin
- heat exchanger
- temperature
- heat
- defrosting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/006—Preventing deposits of ice
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a high-efficiency chassis icing-resistant finned heat exchanger and a working method thereof. The efficient chassis icing-resistant finned heat exchanger provided by the invention thoroughly avoids the phenomena of icing and frosting at the bottom of the fin, and can improve the heat production performance and energy efficiency of a unit. The unit can be stably, efficiently and continuously heated through linkage operation among the quadruple modes, and negative effects caused by frequent defrosting of the unit are avoided.
Description
Technical Field
The invention belongs to the field of heat exchange equipment, and particularly relates to a high-efficiency fin heat exchanger capable of resisting chassis icing and a working method thereof.
Background
When the outdoor environment temperature is low and the humidity is high, the phenomenon of frosting and even icing exists in the outdoor heat exchanger of the air source heat pump. If the defrosting can not be effectively carried out, the continuous and efficient operation of the heat pump unit can be influenced, and finally the alarm shutdown is caused. The problem of fin frosting is solved by periodically defrosting the air source heat pump at low temperature, but frequent start-stop defrosting inevitably has serious influence on the heating of the system, and each reversing defrosting slightly reduces the water temperature of a client using end. After defrosting is finished, a time difference is inevitably generated between restarting and entering stable operation, and the time difference is adverse factors influencing continuous and efficient heating of the system. Especially, when the ambient temperature continuously decreases and the heat generating capacity of the unit also decreases, the reversing defrosting at each time becomes a great disadvantage of the unit. For the unit with top air outlet, the air quantity at the bottom of the fin is the minimum, and the load is larger, so that the unit is most prone to frosting and icing.
The invention provides a high-efficiency chassis icing-resistant finned heat exchanger and a working method thereof, aiming at the problems that the bottom of the finned heat exchanger is frosted or frozen due to low environmental temperature and high humidity during transition in winter or autumn and the phenomenon of final freezing of frost accumulated at the bottom of a fin can be caused due to incomplete defrosting, the performance of an air source heat pump unit is greatly influenced for a long time in the past, and even the possibility of shutdown protection exists.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-efficiency chassis icing-resistant finned heat exchanger and a working method thereof, thoroughly avoiding the phenomena of icing and frosting at the bottom of a fin, and improving the heat production performance and energy efficiency of a unit. The unit can be stably, efficiently and continuously heated through linkage operation among the quadruple modes, and negative effects caused by frequent defrosting of the unit are avoided.
In order to solve the technical problems, an embodiment of the invention provides a high-efficiency finned heat exchanger capable of resisting chassis icing, which comprises fins, a variable resistance heating belt, an anti-freezing working medium pipe and a cold and heat transfer heat pipe, wherein the anti-freezing working medium pipe is coiled inside the fins, the variable resistance heating belt is arranged on one side of the bottoms of the fins, and the cold and heat transfer heat pipe is arranged on the other side of the bottoms of the fins.
The fin temperature sensing tube is arranged at one end of the bottom of the fin tube, and a temperature sensing probe is arranged in the fin temperature sensing tube.
The upper end of the cold and heat migration heat pipe is a condensation heat dissipation end, the lower end of the cold and heat migration heat pipe is an evaporation heat absorption end, and the middle of the cold and heat migration heat pipe is a working medium flow guide core.
Preferably, one end of the anti-freezing working medium main pipe on the side of the fin is an inlet of the anti-freezing working medium pipe, and the other end of the anti-freezing working medium main pipe is an outlet of the anti-freezing working medium pipe.
The invention also provides a working method of the efficient chassis icing-resistant finned heat exchanger, which comprises the following instructions:
instruction 1: the bottom of a high-humidity area of the fin heat exchanger is ensured not to be frosted;
instruction 2: the bottom of the area near the freezing point of the fin heat exchanger is ensured not to be frosted or frozen;
instruction 3: the bottom of a low-temperature area of the fin heat exchanger is ensured not to be frozen;
and 4-6: and the bottom of the fin heat exchanger is prevented from freezing in low-temperature, rainy and snowy severe weather.
The working method of the efficient chassis icing-resistant finned heat exchanger comprises the following steps:
step 1: when the ambient temperature is 4 ℃ < T0When the temperature is less than or equal to 8 ℃, the finned heat exchanger realizes an anti-freezing function through the working medium in the anti-freezing working medium pipe;
step 2: the ambient temperature is continuously reduced to be lower than T at minus 2 DEG C0When the temperature is less than or equal to 4 ℃ and the humidity is increased, the evaporation temperature of the fin heat exchanger is gradually reduced, the heat production capacity of the fin heat exchanger is reduced along with the reduction of the demand of a user side on heat, the surface of fins of the fin heat exchanger is frosted due to high humidity, the heat in air is absorbed by the evaporation heat absorption end of the cold-heat transfer heat pipe, the evaporated refrigerant is transferred to the fin heat exchanger after being transferred to the condensation heat dissipation end, and the frosting phenomenon is effectively inhibited while the capacity transfer is realized;
and step 3: ambient temperature is reduced to T0＜-2℃，TFinIf the temperature is lower than the defrosting set temperature and t is not less than the minimum defrosting time, the fin heat exchanger can be seriously frosted or even frozen when outdoor coincidence is carried out and the cooling capacity of the fins is larger than the heat transferred by the heat pipe, at the moment, the defrosting logic of the fin heat exchanger is started, the refrigerant in the refrigerating system is reversed to transfer the condensation heat to the fin heat exchanger, and therefore the fin surface is subjected to defrosting operationRemoving the frost layer of the surface;
t in the step is the running time of the unit;
and 4, step 4: when the problem of frosting at the bottoms of the fins cannot be solved by any program in the steps 1 to 3, a temperature sensor in the fin temperature sensing tube is used for collecting temperature signals of the fin heat exchanger, and the variable resistance heater is started after theoretical calculation and is used for heating the deicing device.
Further, the defrosting logic of the finned heat exchanger in the step 3 corresponds to instructions 4-6, wherein,
the environmental factors corresponding to instruction 4 are: t is0＜-2℃，TFin< defrost setting temperature, TFinDefrosting exit temperature is less than or equal to;
the environmental factors corresponding to instruction 5 are: t is0＜-2℃，TFin< defrost setting temperature, TFinDefrosting exit temperature is less than or equal to, and defrosting times are more than or equal to 2;
the environmental factors corresponding to instruction 6 are: t is0＜-2℃，TFin< defrost setting temperature, TFinThe defrosting exit temperature is less than or equal to, and the defrosting times are more than or equal to 3.
The technical scheme of the invention has the following beneficial effects:
the efficient chassis icing-resistant finned heat exchanger provided by the invention thoroughly avoids the phenomena of icing and frosting at the bottom of the fin, and can improve the heat production performance and energy efficiency of a unit. The unit can be stably, efficiently and continuously heated through linkage operation among the quadruple modes, and negative effects caused by frequent defrosting of the unit are avoided.
Drawings
FIG. 1 is a front view of a finned heat exchanger according to the present invention;
FIG. 2 is a rear view of the finned heat exchanger of the present invention;
FIG. 3 is a left side view of the finned heat exchanger of the present invention;
FIG. 4 is an enlarged view of a portion of the structure at A in FIG. 1;
fig. 5 is an enlarged view of a portion B of fig. 3.
Description of reference numerals:
1. a fin; 2. a fin temperature sensing tube; 3. a variable resistance heating zone; 4. an anti-freezing working medium pipe; 6. a cold-hot transfer heat pipe; 60. a condensation heat dissipation end; 61. evaporating the heat absorption end; 62. and a working medium flow guide core.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 3, the invention provides a high-efficiency finned heat exchanger capable of resisting chassis icing, which comprises a fin 1, a fin temperature-sensing tube 2, a variable resistance heating belt 3, an anti-freezing working medium tube 4 and a cold-heat transfer heat tube 6, wherein the fin temperature-sensing tube 2 is arranged at one end of the bottom of the fin, and a temperature-sensing probe is arranged in the fin temperature-sensing tube 2. An anti-freezing working medium pipe 4 is coiled inside the fin 1, one end of the anti-freezing working medium main pipe on the side of the fin 1 is an inlet of the anti-freezing working medium pipe, and the other end of the anti-freezing working medium main pipe is an outlet of the anti-freezing working medium pipe.
A resistance-variable heating belt 3 is arranged on one side of the bottom of the fin 1, and a cold-heat transfer heat pipe 6 is arranged on the other side of the bottom of the fin 1.
The upper end of the cold and heat transfer heat pipe 6 is a condensation heat dissipation end 60, the lower end is an evaporation heat absorption end 61, and the middle part of the cold and heat transfer heat pipe 6 is a working medium flow guide core 62.
The invention also provides a working method of the efficient chassis icing-resistant finned heat exchanger, which comprises the following instructions:
instruction 1: the bottom of a high-humidity area of the fin heat exchanger is ensured not to be frosted;
instruction 2: the bottom of the area near the freezing point of the fin heat exchanger is ensured not to be frosted or frozen;
instruction 3: the bottom of a low-temperature area of the fin heat exchanger is ensured not to be frozen;
and 4-6: and the bottom of the fin heat exchanger is prevented from freezing in low-temperature, rainy and snowy severe weather.
The working method of the efficient chassis icing-resistant finned heat exchanger comprises the following steps corresponding to the instructions:
step 1: when the ambient temperature is 4 ℃ < T0When the temperature is less than or equal to 8 ℃, the finned heat exchanger passes through an anti-freezing toolThe working medium in the mass pipe realizes the anti-freezing function; this step corresponds to instruction 1;
step 2: the ambient temperature is continuously reduced to be lower than T at minus 2 DEG C0When the temperature is less than or equal to 4 ℃ and the humidity is increased, the evaporation temperature of the fin heat exchanger is gradually reduced, the heat production capacity of the fin heat exchanger is reduced along with the reduction of the demand of a user side on heat, the surface of fins of the fin heat exchanger is frosted due to high humidity, the heat in air is absorbed by the evaporation heat absorption end of the cold-heat transfer heat pipe, the evaporated refrigerant is transferred to the fin heat exchanger after being transferred to the condensation heat dissipation end, and the frosting phenomenon is effectively inhibited while the capacity transfer is realized; this step corresponds to instruction 2;
and step 3:
ambient temperature is reduced to T0＜-2℃，TFinIf the defrosting setting temperature is lower than the defrosting setting temperature, t is not less than the minimum defrosting time, severe frosting and even icing can occur in the fin heat exchanger when outdoor coincidence exists and the cooling capacity of the fins is larger than the heat transferred by the heat pipe, at the moment, the defrosting logic of the fin heat exchanger is started, and the refrigerant in the refrigerating system is reversed to transfer the condensation heat to the fin heat exchanger, so that the frost layer on the surfaces of the fins is removed; t in the step is the running time of the unit; this step corresponds to instruction 3;
and 4, step 4: when the problem of frosting at the bottoms of the fins cannot be solved by any program in the steps 1-3, acquiring temperature signals of the fin heat exchanger by a temperature sensor in a fin temperature sensing tube, and starting a variable resistance heater for heating the deicing device after theoretical calculation;
the defrosting logic of the finned heat exchanger in the step 3 corresponds to instructions 4-6, wherein,
the environmental factors corresponding to instruction 4 are: t is0＜-2℃，TFin< defrost setting temperature, TFinDefrosting exit temperature is less than or equal to;
the environmental factors corresponding to instruction 5 are: t is0＜-2℃，TFin< defrost setting temperature, TFinDefrosting exit temperature is less than or equal to, and defrosting times are more than or equal to 2;
the environmental factors corresponding to instruction 6 are: t is0＜-2℃，TFin< defrost setting temperature, TFinThe defrosting exit temperature is less than or equal to, and the defrosting times are more than or equal to 3.
Table 1 is a logic control table showing the correspondence between each step and a command, and the bottom defrosting mode of the fin heat exchanger is controlled simply and clearly by using the table.
Supplementary explanation:
1)4℃＜T0≤8℃，TfinIf the unit (the fin heat exchanger is one part of the inside of the unit) is detected to be abnormal, the fluorine leakage of the unit is judged initially.
2)-2℃＜T0≤4℃，TFinIf the set temperature is lower than the defrosting set temperature and t is lower than the minimum defrosting time, the fluorine leakage of the set is initially judged if the set is detected to be abnormal.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides a high-efficient anti chassis finned heat exchanger that freezes which characterized in that, includes fin, resistance-variable heating area, prevents frostbite working medium pipe and cold and hot migration heat pipe, the inside of fin is coiled there is the frostbite working medium pipe, bottom one side of fin is equipped with the resistance-variable heating area, the bottom opposite side of fin is equipped with cold and hot migration heat pipe.
2. The efficient finned heat exchanger capable of resisting chassis icing as claimed in claim 1, wherein one end of the bottom of the finned heat exchanger is provided with a finned temperature sensing tube, and a temperature sensing probe is arranged in the finned temperature sensing tube.
3. The efficient chassis-icing-resistant finned heat exchanger as claimed in claim 1, wherein the upper end of the cold-heat transfer heat pipe is a condensation heat dissipation end, the lower end of the cold-heat transfer heat pipe is an evaporation heat absorption end, and the middle part of the cold-heat transfer heat pipe is a working medium flow guide core.
4. The efficient chassis icing-resistant finned heat exchanger as claimed in claim 1, wherein one end of the antifreeze working medium on the side of the fin is an antifreeze working medium pipe inlet, and the other end of the antifreeze working medium pipe is an antifreeze working medium pipe outlet.
5. A working method of the efficient chassis icing-resistant finned heat exchanger as claimed in any one of claims 1 to 4, characterized by comprising the following instructions:
instruction 1: the bottom of a high-humidity area of the fin heat exchanger is ensured not to be frosted;
instruction 2: the bottom of the area near the freezing point of the fin heat exchanger is ensured not to be frosted or frozen;
instruction 3: the bottom of a low-temperature area of the fin heat exchanger is ensured not to be frozen;
and 4-6: and the bottom of the fin heat exchanger is prevented from freezing in low-temperature, rainy and snowy severe weather.
6. The working method of the efficient chassis icing resistant finned heat exchanger according to claim 5, characterized by comprising the following steps:
step 1: when the ambient temperature is 4 ℃ < T0When the temperature is less than or equal to 8 ℃, the finned heat exchanger realizes an anti-freezing function through the working medium in the anti-freezing working medium pipe;
step 2: the ambient temperature is continuously reduced to be lower than T at minus 2 DEG C0When the temperature is less than or equal to 4 ℃ and the humidity is increased, the evaporation temperature of the fin heat exchanger is gradually reduced, the heat production capacity of the fin heat exchanger is reduced, the demand of a user side on heat is not reduced and increased, the surface of the fin heat exchanger is frosted due to high humidity, and cold and hot water are generatedThe evaporation heat absorption end of the transfer heat pipe absorbs heat in the air, and the evaporated refrigerant working medium transfers the heat to the fin heat exchanger after moving upwards to the condensation heat dissipation end, so that the frosting phenomenon is effectively inhibited while the capacity transfer is realized;
and step 3: ambient temperature is reduced to T0＜-2℃，TFinIf the defrosting setting temperature is lower than the defrosting setting temperature, t is not less than the minimum defrosting time, severe frosting and even icing can occur in the fin heat exchanger when outdoor coincidence exists and the cooling capacity of the fins is larger than the heat transferred by the heat pipe, at the moment, the defrosting logic of the fin heat exchanger is started, and the refrigerant in the refrigerating system is reversed to transfer the condensation heat to the fin heat exchanger, so that the frost layer on the surfaces of the fins is removed;
t in the step is the running time of the unit;
and 4, step 4: when the problem of frosting at the bottoms of the fins cannot be solved by any program in the steps 1 to 3, a temperature sensor in the fin temperature sensing tube is used for collecting temperature signals of the fin heat exchanger, and the variable resistance heater is started after theoretical calculation and is used for heating the deicing device.
7. The working method of the fin heat exchanger with the efficient chassis icing resistance as claimed in claim 6, wherein the defrosting logic of the fin heat exchanger in the step 3 corresponds to instructions 4-6, wherein,
the environmental factors corresponding to instruction 4 are: t is0＜-2℃，TFin< defrost setting temperature, TFinDefrosting exit temperature is less than or equal to;
the environmental factors corresponding to instruction 5 are: t is0＜-2℃，TFin< defrost setting temperature, TFinDefrosting exit temperature is less than or equal to, and defrosting times are more than or equal to 2;
the environmental factors corresponding to instruction 6 are: t is0＜-2℃，TFin< defrost setting temperature, TFinThe defrosting exit temperature is less than or equal to, and the defrosting times are more than or equal to 3.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111397708A (en) * | 2020-04-24 | 2020-07-10 | 上海交通大学 | Non-contact measuring device for ice amount of wet dust on surface of heat exchanger fin |
| CN111765665A (en) * | 2020-06-17 | 2020-10-13 | 珠海格力电器股份有限公司 | Automatic and accurate defrosting control method and device and heat pump water heater |
| CN114719540A (en) * | 2022-05-03 | 2022-07-08 | 四方科技集团股份有限公司 | Quick defrosting type air-cooler |
| CN115200259A (en) * | 2021-04-09 | 2022-10-18 | 广东芬尼克兹节能设备有限公司 | Control method and device for preventing heat pump unit chassis from freezing |
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| CN202501683U (en) * | 2012-03-02 | 2012-10-24 | 山东宏力空调设备有限公司 | Solar heat pipe condensation defrosting device |
| CN109539622A (en) * | 2018-11-30 | 2019-03-29 | 上海海立睿能环境技术有限公司 | A kind of net for air-source heat pump units and its defrosting control method |
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| US6467282B1 (en) * | 2000-09-27 | 2002-10-22 | Patrick D. French | Frost sensor for use in defrost controls for refrigeration |
| JP2009162393A (en) * | 2007-12-28 | 2009-07-23 | Daikin Ind Ltd | Air conditioner |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111397708A (en) * | 2020-04-24 | 2020-07-10 | 上海交通大学 | Non-contact measuring device for ice amount of wet dust on surface of heat exchanger fin |
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| CN115200259A (en) * | 2021-04-09 | 2022-10-18 | 广东芬尼克兹节能设备有限公司 | Control method and device for preventing heat pump unit chassis from freezing |
| CN115200259B (en) * | 2021-04-09 | 2023-11-28 | 广东芬尼克兹节能设备有限公司 | Control method and device for preventing chassis of heat pump unit from icing |
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| CN114719540B (en) * | 2022-05-03 | 2024-03-08 | 四方科技集团股份有限公司 | Quick defrosting type air cooler |
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