CN110926070A - Thermosiphon passive defrosting and condensing system and control method thereof - Google Patents
Thermosiphon passive defrosting and condensing system and control method thereof Download PDFInfo
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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
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention discloses a thermosiphon passive defrosting condensation system and a control method thereof, wherein the thermosiphon passive defrosting condensation system comprises a condensation loop and a thermosiphon defrosting loop, an evaporator is arranged on the condensation loop, the thermosiphon defrosting loop is connected with the evaporator, a first heat exchanger is arranged on the condensation loop, the thermosiphon defrosting loop is connected with the first heat exchanger, a second heat exchanger is arranged on the thermosiphon defrosting loop, the second heat exchanger is connected with a solar flat plate collector, and the solar flat plate collector comprises a solar heat collection module and an electric heating module. The solar heat-collecting and utilizing system has the advantages that two heat sources, namely solar heat-collecting utilization and electric heating auxiliary heating, are added on the basis of the original single heat source, and the effective switching of various heat sources is realized through the accurate control of the system, so that the energy consumption is saved for the operation of the system; in addition, the defrosting speed of the system is obviously improved as the added heat source provides sufficient heat for the system to defrost.
Description
Technical Field
The invention discloses a thermosyphon passive defrosting and condensing system and a control method thereof, belonging to the field of oil gas condensation and recovery.
Background
The rise of new energy application and the pollution current situation of primary energy application focus attention on the application of combining new energy with pollution control. In order to meet the tail gas emission standard specified by the state in the process of storage and transportation of petrochemical products, an oil gas recovery processing device is required to be installed to process the exhaust gas, so that a condensation method is indispensable in the physical recovery link of oil gas treatment.
The existing oil gas recovery condensing unit collects and sends oil gas into evaporators at all levels to exchange heat with a refrigerant, and condenses and recovers volatilized oil gas through the characteristic of cooling and condensation. In the process of oil gas cooling, water vapor, oil product components and the like contained in the oil gas are condensed on the surface of the heat exchanger in a frost shape due to low temperature, so that the heat exchange effect of the evaporator is influenced, the oil gas is also blocked from passing through, and the frost on the outer surface of a heat exchange tube of the evaporator is required to be melted. In some continuous long-time operation occasions, the condensing system also needs to consider the design capable of simultaneously condensing and defrosting, and in addition, the requirement of stopping the defrosting is also considered in the intermittent operation occasions.
The defrosting method commonly used in the industry at present comprises the following steps: 1) the electric heater is used for directly heating the outside of the heat exchanger needing defrosting to be heated and defrosted, the electric heating energy consumption of the method is large, and frosting substances in the heat exchanger usually contain flammable hydrocarbons and are easy to generate danger. 2) The exhaust gas generated during the operation of the compressor is discharged into the heat exchanger for defrosting, part of the refrigerant is short-circuited and does not participate in the refrigeration cycle, the cold energy of the system is reduced, meanwhile, heat energy is required to be provided for defrosting during the operation of the system, the defrosting cannot be completely performed, and the purpose of really performing long-time condensation operation cannot be achieved. 3) The Chinese patent No. CN201821079938 discloses a thermosiphon defrosting dual-channel oil gas recovery condensing unit, and the defrosting method comprises the following steps: the refrigerant is evaporated to the evaporative condenser by absorbing the heat of the liquid pipe after primary condensation, the heat is transferred to frost and then condensed into liquid, and the liquid flows back to the heat exchanger at the liquid pipe under the action of gravity, so that primary circulation is completed. This method also requires that the system be operated to provide thermal energy. Generally, the methods actively provide a heat source to heat and defrost a frosted part, so that the operation power consumption is increased, and in addition, the temperature fluctuation of a system cooling side is caused or the aim of quick defrosting is not achieved.
Disclosure of Invention
The invention provides a thermosiphon passive defrosting and condensing system and a control method of the system, which are characterized in that two heat sources of solar heat collection utilization and electric heating auxiliary heating are added on the basis of the original single heat source, and the effective switching of various heat sources is realized through the accurate control of the system, so that the energy consumption is saved for the operation of the system; in addition, because the added multi-stage heat source provides sufficient heat for the system to defrost, the defrosting rate of the system is obviously improved.
The invention relates to a thermosiphon passive defrosting condensation system which comprises a condensation loop and a thermosiphon defrosting loop, wherein an evaporator is arranged on the condensation loop, the thermosiphon defrosting loop is connected with the evaporator, a first heat exchanger is arranged on the condensation loop, the thermosiphon defrosting loop is connected with the first heat exchanger, a second heat exchanger is arranged on the thermosiphon defrosting loop, the second heat exchanger is connected with a solar flat plate collector, the solar flat plate collector comprises a solar heat collection module and/or an electric heating module, the solar heat collection module is a device which obtains heat by adopting heat transfer medium to exchange heat with solar energy, and the electric heating module is a device which obtains heat by adopting electric energy to heat and heat exchange medium through heat exchange.
Further, the evaporator is provided in plurality, and a plurality of the evaporators are connected in parallel.
Further, the second heat exchanger is connected with the solar heat collection module through a first control valve, and the second heat exchanger is connected with the electric heating module through a second control valve.
Another aspect of the present invention relates to a control method for a thermosiphon passive defrosting condensing system, which is applied to the above-mentioned condensing system, and comprises:
conducting the thermosiphon defrosting loop and the condensing loop, and closing the solar flat plate collector;
and if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, opening a first control valve, connecting the second heat exchanger with the solar heat collection module, and enabling the solar heat collection module of the solar flat plate heat collector to supplement heat for the thermosiphon defrosting loop.
Further, after the first control valve is opened, if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, the second control valve is opened to connect the second heat exchanger with the electric heating module, so that the electric heating module of the solar flat plate collector supplements heat for the thermosiphon defrosting loop.
Further, the control method further includes: and if the temperature of the waste heat outlet of the thermosiphon defrosting loop is between 20 ℃ and 30 ℃ and the temperature difference between the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is between 10K and 30K, outputting a defrosting signal.
Further, the control method further includes: and if the temperature of the waste heat outlet of the thermosiphon defrosting loop exceeds 30 ℃ or the temperature of the waste heat inlet of the thermosiphon defrosting loop is higher than 35 ℃, closing the electric heating module of the solar flat plate collector.
Further, the control method further includes: and if the temperature difference between the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is lower than 10K, outputting a defrosting ending signal and closing the thermosiphon defrosting loop.
Further, the control method further includes: and when the second control valve is opened, if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, outputting a defrosting temperature low abnormal signal.
Further, the control method further includes: and if the temperature difference of the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is higher than 35 ℃, outputting a defrosting temperature high abnormal signal, and closing the thermosiphon defrosting loop.
The invention brings the following beneficial effects: the solar heat-collecting and utilizing system has the advantages that two heat sources, namely solar heat-collecting utilization and electric heating auxiliary heating, are added on the basis of the original single heat source, and the effective switching of various heat sources is realized through the accurate control of the system, so that the energy consumption is saved for the operation of the system; in addition, because the heat source that increases provides sufficient heat for the system and changes frost for the temperature difference control is more accurate when the system defrosting, can avoid system temperature fluctuation, improves defrosting efficiency.
Drawings
FIG. 1 is a block diagram of a thermosiphon passive defrost condensing system according to the present invention;
FIG. 2 is a structural diagram of a thermosiphon passive defrosting condensing system in a single waste heat defrosting mode according to the present invention;
FIG. 3 is a block diagram of a thermosiphon passive defrosting condensing system of the present invention in a solar assisted defrosting mode;
FIG. 4 is a structural diagram of an electric auxiliary hot defrosting mode of a thermosiphon passive defrosting condensing system according to the present invention;
FIG. 5 is a block diagram of a single-channel thermosiphon passive defrost condensing system according to the present invention;
FIG. 6 is a structural view of a solar flat panel collector according to the present invention;
fig. 7 is a flow chart of a control method of the thermosiphon passive defrosting condensing system according to the present invention.
Detailed description of the preferred embodiments
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Examples
Referring to fig. 1 and fig. 6, the present embodiment discloses a thermosiphon passive defrosting condensing system, which includes a condensing loop 100 and a thermosiphon defrosting loop 200, wherein an evaporator 10 is disposed on the condensing loop 100, the thermosiphon defrosting loop 200 is connected to the evaporator 10, a first heat exchanger 21 is disposed on the condensing loop 100, the thermosiphon defrosting loop 200 is connected to the first heat exchanger 21, a second heat exchanger 22 is disposed on the thermosiphon defrosting loop 200, the second heat exchanger 22 is connected to a solar flat plate collector 300, and the solar flat plate collector 300 includes a solar heat collection module 31 and an electric heating module 32.
The condensation circuit 100 is a circulation circuit for supplying a refrigerant to the evaporator 10 to liquefy the oil gas in the evaporator 10. The thermosiphon defrosting circuit 200 is a circulation circuit for supplying heat to the evaporator 10 to thaw frost lumps formed when the oil gas is liquefied in the evaporator 10, wherein a medium for carrying heat in the thermosiphon defrosting circuit 200 is a refrigerant remaining in the evaporator 10. In this embodiment, two parallel evaporators 10 are disposed on the condensing loop 100, and when the condensing loop 100 condenses and liquefies oil gas in one of the evaporators 10, the other evaporator 10 closes its control valve connected to the condensing loop 100, so as to enter into the defrosting process instead of refrigerating. The two evaporators 10 are alternately exchanged to achieve the aim of continuous operation. In other embodiments, more evaporators 10 may be disposed on the condensation circuit 100 and used in combination with multiple sets of thermosiphon defrosting circuits 200, or when only one evaporator 10 is disposed on the condensation circuit 100, the two processes of oil gas condensation liquefaction and defrosting are performed alternately in the evaporator.
Fig. 2 is a structural diagram of a dual-channel thermosiphon passive defrosting condensing system according to the present embodiment, in which the portions marked by black bold lines are conductive loops. As shown in fig. 2, when the system performs defrosting by absorbing only the residual heat on the condensing loop 100 through the first heat exchanger 21, it is referred to as a single residual heat defrosting mode. The single waste heat defrosting mode is that the defrosting heat is only derived from the waste heat on the condensing loop 100 replaced by the first heat exchanger 21, so that the single waste heat defrosting mode only has the waste heat for absorption when the condensing loop 100 operates, and therefore, the single waste heat defrosting mode is not enough for a single-channel system or a system which operates intermittently.
Fig. 3 is a structural diagram of a dual-channel thermosiphon passive defrosting condensing system according to the present embodiment, in which the portions marked by black bold lines are conductive loops, and fig. 3 shows a state where the solar heat collection module is turned on and the electric heating module is not turned on. As shown in fig. 3, when the system simultaneously absorbs the residual heat on the condensing loop 100 through the first heat exchanger 21 and turns on the solar heat collecting module 31 for defrosting, it is called a solar auxiliary defrosting mode. The solar auxiliary defrosting mode refers to the defrosting heat source comprising the residual heat on the condensing loop 100 replaced by the first heat exchanger 21 and the heat of the solar energy in the nature replaced by the solar heat collecting module 31, wherein the solar heat collecting module 31 which is opened is used for compensating the insufficient heat when the first heat exchanger 21 is defrosted.
Fig. 4 is a structural diagram of a dual-channel thermosiphon passive defrosting condensing system according to the present embodiment, in which the portions marked by black bold lines are conductive loops, and fig. 4 shows a state where both the solar heat collection module and the electric heating module are turned on. As shown in fig. 4, when the system absorbs the residual heat on the condensing loop 100 through the first heat exchanger 21, turns on the solar heat collecting module 31 and turns on the electric heating module 32 for defrosting at the same time, it is called an electric auxiliary heating defrosting mode. The electrically assisted heating defrosting mode refers to a defrosting heat source including residual heat on the condensing loop 100 replaced by the first heat exchanger 21, heat generated by replacing solar energy in nature by the solar heat collecting module 31, and heat converted by commercial power after the electric heating module 32 is turned on, wherein the turned-on electric heating module 32 is used for compensating insufficient heat generated when the first heat exchanger 21 and the solar heat collecting module 31 are jointly defrosted.
Fig. 5 is a structural diagram of a single-channel thermosiphon passive defrosting condensing system according to the present embodiment, in which the portion marked by a thick black line is a conducting loop. As shown in figure 5, because only one evaporator is arranged in the single-channel thermosiphon passive defrosting condensation system, the evaporator alternately condenses, liquefies and defrosts oil gas, when the evaporator is in defrosting state, the condensation loop is closed, and the first heat exchanger 21 does not use waste heat for absorption, so that defrosting is supplied by the solar heat collection module 31 or the solar heat collection module 31 and the electric heating module 32 together. In further embodiments, it is not even necessary to provide the first heat exchanger 21 on the condensation circuit 100.
As shown in fig. 6, the heat absorbed by the first heat exchanger is the heat energy absorbed by the condensing loop 100, and the heat energy can be used as one of the heat sources for defrosting in the thermosiphon defrosting loop 200, when the heat absorbed by the first heat exchanger is insufficient for quick defrosting, that is, when the heat energy in the single waste heat defrosting mode is insufficient, the heat energy in the solar flat plate collector 300 can be replaced by the second heat exchanger to the thermosiphon defrosting loop 200 to be used as a supplementary heat source, that is, in the solar assisted defrosting mode. The solar flat plate collector 300 includes a solar heat collecting module 31 and an electric heating module 32, and specifically, the solar heat collecting module 31 is a device that obtains heat by heat exchange between a heat transfer medium and solar energy. The electric heating module 32 is a device that generates heat by electric energy and makes the heat exchange medium obtain heat by heat exchange, i.e., an electric auxiliary heating defrosting mode.
Specifically, the solar flat plate collector 300 comprises a heat exchange main body 301, wherein the heat exchange main body 301 is a 12.7 mm diameter coiled pipe, a copper pipe with good heat conduction performance is adopted as a material, and a smooth pipe with a larger pipe diameter is adopted to reduce the internal flow resistance. And a plurality of rows of short serpentine tubes are arranged side by side with upper and lower ends communicating with upper horizontal headers 305 and lower horizontal headers 306, respectively. The lower horizontal collecting pipe is bent to the middle part at one side and serves as a heat exchange medium inlet so as to ensure that the whole coiled pipe can contain a small amount of redundant liquid; the middle part of the upper horizontal header 305 is a heat exchange medium outlet to ensure the free upward flow of the heated medium. The connected coiled pipes are spread on a copper plate (not shown) and tightly welded, integral contact pressure welding can be adopted to form a common large rib surface, and meanwhile, a selective absorption coating is coated on the non-welding part to strengthen the absorption of solar energy. The flat plate is put into a customized groove box 303 and positioned, and a foaming agent 304 is filled between the coiled pipe and the groove box 303 for pressurization and foaming, so that the effects of sealing and heat preservation are achieved. Then the surface of the copper plate is covered with transparent glass with higher hardness and is fixed by metal to form a whole. The whole thickness of the flat plate collector (not shown in the figure) is not more than 30 mm, is consistent with the panel bent by the metal plate, and is arranged on the sunny side. The shape can be according to the facade installation size, and two to three rows of coiled pipes generally constitute a flat plate collector, and a plurality of flat plate collectors can connect in parallel again. The trough box 303, the heat exchange body 301, the copper plate and the transparent glass jointly form the solar heat collection module 31. It should be noted that, the above solar flat plate collector can refer to chinese patent CN2013103281591 for more detailed structural and functional description, and no further description is provided here.
In order to ensure the continuous operation of the defrosting mechanism when the collector is in special dark or insufficient sunlight, a small amount of PTC self-temperature-limiting electric heating bands 302 are coated on the lower horizontal collecting pipe part before the heat collector foams so as to assist in heating. The provided heat can be effectively converted due to the volatile refrigerant in the pipe, and the external foaming heat-insulating material is arranged, so that the energy utilization rate is high. When the temperature of the outlet temperature sensor of the solar flat plate collector is lower than a set value, electric heating is assisted to provide heat in an auxiliary mode. The PTC self-temperature-limiting electric heating tape 302 and the heat exchange main body 301 together constitute the electric heating module 32.
Therefore, the present invention can not only effectively utilize the residual heat of the condensation loop 100 for defrosting, but also fully utilize the solar energy for defrosting when the residual heat is insufficient, and utilize the electric heating module 32 as the compensation heat source as the compensation heat energy, thereby providing sufficient heat guarantee for the thermosiphon defrosting loop.
Referring to fig. 7, the present embodiment further discloses a control method of a thermosiphon passive defrosting condensing system, which is applied to the above-mentioned condensing system, and the control method includes:
conducting the thermosiphon defrosting loop and the condensing loop, and closing the solar flat plate collector;
and if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, opening a first control valve, connecting the second heat exchanger with the solar heat collection module, and enabling the solar heat collection module of the solar flat plate heat collector to supplement heat for the thermosiphon defrosting loop.
Further, after the first control valve is opened, if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, the second control valve is opened to connect the second heat exchanger with the electric heating module, so that the electric heating module of the solar flat plate collector supplements heat for the thermosiphon defrosting loop.
In the method, after the thermosiphon defrosting loop is conducted, the first heat energy in the loop is derived from the heat on the condensation loop replaced by the first heat exchanger, and the solar flat plate collector is closed at first. When the defrosting loop operates for a period of time, the temperature of the waste heat outlet of the thermosiphon defrosting loop is detected to be lower than 20 ℃, and the fact that the medium in the evaporator does not circulate or the heat provided by the first heat exchanger is insufficient results in that the defrosting circulation is too slow, so that heat energy needs to be supplemented to the defrosting loop, and at the moment, the solar heat collection module of the solar flat plate collector is started to supplement heat to the thermosiphon defrosting loop.
When the loop is started for a period of time, the temperature of the waste heat outlet of the thermosiphon defrosting loop is still lower than 20 ℃ through continuous detection, which indicates that the heat obtained by the replacement of the first heat exchanger and the heat supplied by the solar heat collecting module of the solar flat plate collector are not enough, the defrosting circulation is still too slow, so that the defrosting loop needs to be continuously supplemented with heat energy, and at the moment, the electric heating module of the solar flat plate collector is started to supplement heat for the thermosiphon defrosting loop. It should be noted that, when the electric heating module of the solar flat plate collector is used to supplement the heat of the thermosiphon defrosting circuit, the control should be: the inlet temperature of the waste heat of the thermosiphon defrosting loop is not higher than 35 ℃.
Further, the control method further includes: and if the temperature of the waste heat outlet of the thermosiphon defrosting loop is between 20 ℃ and 30 ℃ and the temperature difference between the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is between 10K and 30K, outputting a defrosting signal.
The defrosting refers to a normal defrosting state in which defrosting is controlled within a predetermined defrosting speed range; on the contrary, when the defrosting speed is too low, the system can perform corresponding control on the first control valve and the second control valve, and when the opening of the second control valve is regulated and controlled to still not reach the normal defrosting speed, the system is in an abnormal defrosting state and outputs a defrosting abnormal signal. Therefore, in this embodiment, the system judges the normal defrosting state through the two parameters of the temperature range of the waste heat outlet and the temperature difference range of the waste heat inlet and the waste heat outlet.
Further, the control method further includes: and when the second control valve is opened, if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, outputting a defrosting temperature low abnormal signal. Further, the control method further includes: and if the temperature of the waste heat outlet of the thermosiphon defrosting loop exceeds 30 ℃ or the temperature of the waste heat inlet of the thermosiphon defrosting loop is higher than 35 ℃, closing the electric heating module of the solar flat plate collector.
Further, the control method further includes: and if the temperature difference of the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is higher than 35 ℃, outputting a defrosting temperature high abnormal signal, and closing the thermosiphon defrosting loop.
And if the temperature of the waste heat outlet of the thermosiphon defrosting loop exceeds 30 ℃ and the electric heating module of the solar flat plate collector is started, namely the electric auxiliary heating defrosting mode is started, the electric heating module of the solar flat plate collector is closed. When the temperature of the waste heat outlet of the thermosiphon defrosting loop exceeds 30 ℃, the temperature of the waste heat inlet is over high, the waste heat is not fully utilized, and in order to avoid waste of heat energy, the electric heating module of the solar flat plate collector is closed, at the moment, heat is obtained by only depending on the first heat exchanger and is supplied by the solar heat collecting module of the solar flat plate collector, and the solar auxiliary defrosting mode is switched. Similarly, under two heating modes of only exchanging heat by the first heat exchanger and supplying heat by using the solar heat collection module of the solar flat plate collector, if the temperature of the waste heat outlet of the thermosiphon defrosting loop exceeds 30 ℃, the solar heat collection module of the solar flat plate collector is closed, namely, the solar flat plate collector is switched to a single waste heat defrosting mode. And when the temperature difference of the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is higher than 35 ℃, outputting a defrosting temperature high abnormal signal and closing the defrosting loop.
Further, the control method further includes: and if the temperature difference between the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is lower than 10K, outputting a defrosting ending signal and closing the thermosiphon defrosting loop.
The temperature difference between the waste heat inlet and the waste heat outlet is lower than 10K, which indicates that the frost mass in the evaporator is reduced to the minimum or the frost mass in the evaporator is completely melted, so that the heat absorption is low, and the temperature difference between the waste heat inlet and the waste heat outlet is low.
In conclusion, the solar heat collector and the electric heating auxiliary heating heat source are added on the basis of the original single heat source, and the effective switching of various heat sources is realized through the accurate control of the system, so that the energy consumption is saved for the operation of the system; in addition, because the added heat source provides sufficient heat for the system to defrost, the defrosting rate of the system is obviously improved
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a passive defrosting condensing system of thermosiphon, includes condensation return circuit and thermosiphon defrosting return circuit, be equipped with the evaporimeter on the condensation return circuit, thermosiphon defrosting return circuit connects the evaporimeter, its characterized in that, be equipped with first heat exchanger on the condensation return circuit, thermosiphon defrosting return circuit connects first heat exchanger, be equipped with the second heat exchanger on the thermosiphon defrosting return circuit, solar flat plate collector is connected to the second heat exchanger, solar flat plate collector includes solar energy collection module and/or electric heating module, solar energy collection module is for adopting heat transfer medium and solar energy to carry out the heat exchange and obtain thermal device, electric heating module is for generating heat and making heat transfer medium obtain thermal device through the heat exchange through the electric energy.
2. The thermosiphon passive defrost condensing system of claim 1, wherein said evaporators are provided in plurality and a plurality of said evaporators are connected in parallel.
3. The thermosiphon passive defrost condensing system of claim 2, wherein said second heat exchanger is connected to said solar energy collection module through a first control valve and said second heat exchanger is connected to said electric heating module through a second control valve.
4. A method of controlling a thermosiphon passive defrost condensing system for use with the condensing system of any one of claims 1 to 3, the method comprising:
conducting the thermosiphon defrosting loop and the condensing loop, and closing the solar flat plate collector;
and if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, starting a first control valve, connecting the second heat exchanger with the solar heat collection module, and enabling the solar heat collection module to supplement heat for the thermosiphon defrosting loop.
5. The control method according to claim 4, characterized by further comprising: and after the first control valve is opened, if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, the second control valve is opened to connect the second heat exchanger with the electric heating module, so that the electric heating module supplements heat for the thermosiphon defrosting loop.
6. The control method according to claim 5, characterized by further comprising: and if the temperature of the waste heat outlet of the thermosiphon defrosting loop is between 20 ℃ and 30 ℃ and the temperature difference between the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is between 10K and 30K, outputting a defrosting signal.
7. The control method according to claim 5, characterized by further comprising: and if the temperature of the waste heat outlet of the thermosiphon defrosting loop exceeds 30 ℃ or the temperature of the waste heat inlet of the thermosiphon defrosting loop is higher than 35 ℃, closing the electric heating module of the solar flat plate collector.
8. The control method according to claim 7, characterized by further comprising: and if the temperature difference between the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is lower than 10K, outputting a defrosting ending signal and closing the thermosiphon defrosting loop.
9. The control method according to claim 5, characterized by further comprising: and when the second control valve is opened, if the temperature of the waste heat outlet of the thermosiphon defrosting loop is lower than 20 ℃, outputting a defrosting temperature low abnormal signal.
10. The control method according to claim 4, characterized by further comprising: and if the temperature difference of the waste heat inlet and the waste heat outlet of the thermosiphon defrosting loop is higher than 35 ℃, outputting a defrosting temperature high abnormal signal, and closing the thermosiphon defrosting loop.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911081092.XA CN110926070A (en) | 2019-11-07 | 2019-11-07 | Thermosiphon passive defrosting and condensing system and control method thereof |
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| CN201911081092.XA CN110926070A (en) | 2019-11-07 | 2019-11-07 | Thermosiphon passive defrosting and condensing system and control method thereof |
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| CN103411321A (en) * | 2013-07-31 | 2013-11-27 | 广东申菱空调设备有限公司 | Flat plate type solar heat collector |
| CN105858763A (en) * | 2016-04-08 | 2016-08-17 | 哈尔滨工业大学 | Purifying and heating integrated device |
| CN106352558A (en) * | 2016-08-25 | 2017-01-25 | 上海理工大学 | Solar instant heat pump water heater |
| CN107014090A (en) * | 2017-06-12 | 2017-08-04 | 浙江鸿乐光热科技有限公司 | The double combination energy-saving water heaters of solar energy-electric energy |
| CN108731292A (en) * | 2018-07-09 | 2018-11-02 | 广东申菱环境系统股份有限公司 | A kind of heat siphon type defrosting binary channels petroleum vapor recovery condensation unit |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411321A (en) * | 2013-07-31 | 2013-11-27 | 广东申菱空调设备有限公司 | Flat plate type solar heat collector |
| CN105858763A (en) * | 2016-04-08 | 2016-08-17 | 哈尔滨工业大学 | Purifying and heating integrated device |
| CN106352558A (en) * | 2016-08-25 | 2017-01-25 | 上海理工大学 | Solar instant heat pump water heater |
| CN107014090A (en) * | 2017-06-12 | 2017-08-04 | 浙江鸿乐光热科技有限公司 | The double combination energy-saving water heaters of solar energy-electric energy |
| CN108731292A (en) * | 2018-07-09 | 2018-11-02 | 广东申菱环境系统股份有限公司 | A kind of heat siphon type defrosting binary channels petroleum vapor recovery condensation unit |
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