CN111854181A - Vapor-liquid circulation solar water heater - Google Patents
Vapor-liquid circulation solar water heater Download PDFInfo
- Publication number
- CN111854181A CN111854181A CN201910365764.3A CN201910365764A CN111854181A CN 111854181 A CN111854181 A CN 111854181A CN 201910365764 A CN201910365764 A CN 201910365764A CN 111854181 A CN111854181 A CN 111854181A
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- circulation
- heat
- liquid
- circulating
- heat collector
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/90—Solar heat collectors using working fluids using internal thermosiphonic circulation
- F24S10/95—Solar heat collectors using working fluids using internal thermosiphonic circulation having evaporator sections and condenser sections, e.g. heat pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
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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
- Y02E10/44—Heat exchange systems
Abstract
The utility model provides a vapour-liquid circulation solar water heater, thermal-arrest circulation system are vacuum negative pressure system, constitute by heat collector, heat storage water tank, heat exchanger, thermostatic valve, expansion device, exhaust apparatus, and wherein the heat exchanger is established and is connected formation thermal-arrest circulation circuit, its characterized in that by circulation line and heat collector at heat storage water tank: and a circulation-assisting condenser is arranged at a position equal to or higher than the heat collector, the heat storage water tank is lower than the heat collector, the circulation-assisting condenser is a simple condenser, a circulation outlet of the heat collector is connected with a circulation inlet of the heat exchanger through a condensed side, and a circulation outlet of the heat exchanger is connected with a circulation inlet of the heat collector through a condensed side to form a heat collection circulation loop. The invention aims to provide a natural circulation solar water heater with a heat storage water tank lower than a heat collector.
Description
Technical Field
The invention relates to a natural circulation solar water heater, in particular to a vapor-liquid circulation solar water heater for carrying out boiling convection circulation heat transfer under the vacuum negative pressure condition.
Background
In the existing natural circulation solar water heater, the heat storage water tank is arranged at a position higher than the heat collector, so that the heat storage water tank is not easy to be perfectly combined with a building.
Disclosure of Invention
The invention aims to provide a natural circulation solar water heater with a heat storage water tank lower than a heat collector.
The invention relates to a vapor-liquid circulation solar water heater, wherein a heat collection circulation system is a vacuum negative pressure system and comprises a heat collector, a heat storage water tank, a heat exchanger, a thermostatic valve, an expansion device and an exhaust device, wherein the heat exchanger is arranged in the heat storage water tank and is connected with the heat collector by a circulation pipeline to form a heat collection circulation loop, and the vapor-liquid circulation solar water heater is characterized in that: a circulation-assisting condenser is arranged at a position equal to or higher than the heat collector, the heat storage water tank is lower than the heat collector, the circulation-assisting condenser is a simple condenser, a circulation outlet of the heat collector is connected with a circulation inlet of the heat exchanger through a condensed side, and a circulation outlet of the heat exchanger is connected with a circulation inlet of the heat collector through a condensing side to form a circulation loop of the heat collector; the upper circulating pipe is divided into a vapor-liquid high-temperature ascending section and a liquid-state high-temperature ascending section, the lower circulating pipe is divided into a liquid-state low-temperature ascending section and a liquid-state high-temperature ascending section, the heat collector side of the circulation-assisted condenser is connected with the vapor-liquid high-temperature ascending section of the upper circulating pipe and the liquid-state high-temperature ascending section of the lower circulating pipe, and the heat storage water tank side of the circulation-assisted condenser is connected with the liquid-state high-temperature ascending section of the upper circulating pipe; the thermostatic valve is arranged on the heat collection circulation loop to control the on and off of the heat collection circulation loop; the expansion device is arranged at the highest point of the heat collection circulating system, the exhaust device is arranged at the highest point of the expansion device, the expansion space of the expansion device is equal to or smaller than the return displacement of the heat collector, the heat collection circulating system is of a good exhaust structure, non-condensable gas exhaust channels are arranged between the highest point of the upper circulating pipe and the lower circulating pipe and the expansion device, and at least one non-condensable gas exhaust channel is connected with the expansion device through a micropore or a valve; the working liquid level of the heat collection circulating system is equal to or higher than that of the heat collection circulating loop. (working liquid level refers to the liquid level of the heat collecting circulation system when the heat collecting circulation is operated)
The thermostatic valve is arranged on the heat collection circulation loop to control the on and off of the heat collection circulation loop, the heat collection circulation loop is opened when the thermostatic valve is opened, heat collection circulation can be carried out, the heat collection circulation loop is closed when the thermostatic valve is closed, heat collection circulation cannot be carried out, a heat transfer medium in the heat collector can be overheated, vaporized and discharged back to the expansion device, the heat collection circulation system is in an overheating protection state, and the heat transfer medium of the heat collector is discharged back to the expansion device and simultaneously discharges air in the expansion device to form a vacuum negative pressure system. When the thermostatic valve is arranged between the circulation direction of the heat collector circulation outlet and the exhaust outlet, the heat transfer medium in the heat collector is discharged back to the expansion device through the heat collector circulation inlet in a liquid state. When the thermostatic valve is arranged between the circulation direction of the exhaust outlet and the circulation inlet of the heat collector, the heat transfer medium in the heat collector is vaporized and then enters the auxiliary circulation condenser through the circulation outlet of the heat collector to be condensed and then is discharged back to the expansion device, at the moment, the capacity of the auxiliary circulation condenser can be properly increased, the heat transfer medium loss caused by system overheating can be prevented, and the heat transfer medium loss caused by the system overheating which is possibly caused by the condition can also be prevented by adopting the exhaust device with the back discharge expansion function.
The expansion device is arranged at the highest point of the heat collection circulating system, the exhaust device is arranged at the highest point of the expansion device, the expansion space of the expansion device is equal to or smaller than the return displacement of the heat collector, the heat collection circulating system is of a good exhaust structure, and non-condensable gas exhaust channels are arranged between the highest points of the upper circulating pipe and the lower circulating pipe and the expansion device, so that air of the heat collection circulating system can be completely exhausted, and meanwhile, air blockage of the heat collection circulating circuit can be prevented. Non-condensable gas discharge channels are arranged between the highest point of the upper and lower circulating pipes and the expansion device, wherein at least one non-condensable gas discharge channel is connected with the expansion device through a micropore or a valve, so that the upper and lower circulating pipes are prevented from being short-circuited.
The working liquid level of the heat collection circulating system is equal to or higher than that of the heat collection circulating loop, so that the liquid state communication of the heat collection circulating loop in the heat collection circulating operation is maintained, and the pressure communication of the heat collection circulating loop is ensured.
On the premise that the pressure of the heat collection circulation loop is communicated, the liquid high-temperature ascending section of the lower circulation pipe and the liquid high-temperature ascending section of the upper circulation pipe on the heat collector side of the circulation-assisted condenser generate circulation pressure, and the liquid low-temperature ascending section of the lower circulation pipe and the liquid high-temperature descending section of the upper circulation pipe on the heat storage water tank side of the circulation-assisted condenser generate reverse circulation pressure. Under the condition of vacuum negative pressure of a heat collection circulating system, a heat collector is radiated by the sun, a heat transfer medium in the heat collector boils, a liquid high-temperature ascending section of a lower circulating pipe on the heat collector side of a circulation-assisted condenser and a vapor-liquid high-temperature ascending section of an upper circulating pipe generate strong boiling convection circulating pressure, a vapor-liquid mixed heat transfer medium ascends into the circulation-assisted condenser and is condensed by a condensing side and then enters into the liquid high-temperature ascending section of the upper circulating pipe, a liquid low-temperature ascending section of a lower circulating pipe on the heat storage water tank side of the circulation-assisted condenser and a liquid high-temperature descending section of the upper circulating pipe generate weak temperature difference convection reverse circulating pressure, the strong boiling convection circulating pressure overcomes the weak temperature difference convection reverse circulating pressure, the liquid high-temperature heat transfer medium descends into a heat exchanger for heat exchange, the liquid low-temperature heat transfer medium ascends into the condensing side, and (5) continuously circulating.
Furthermore, the circulation-assisting condenser is arranged at a low position by a condensation side circulation inlet, a circulation outlet is arranged at a high position, a condensation side circulation inlet is arranged at a high position, and the condensation side circulation outlet and the condensation side circulation inlet are at the same height. The expansion device is arranged on the top of the condensation side and is integrated with the condensation side or is connected with the top of the condensation side and is kept open with the condensation side. The expansion device is arranged on the top of the condensed side and integrated with the condensed side or connected with the top of the condensed side and kept open with the condensed side. (open means gas-liquid communication, and can maintain the normal state of gas-liquid)
The auxiliary circulation condenser is arranged at a low position by a condensation side circulation inlet, and when a circulation outlet is arranged at a high position, the condensation side can become a part of the upper circulation pipe steam-liquid high-temperature ascending section, so that the improvement of circulation pressure is facilitated, and meanwhile, the condition that no heat transfer medium steam enters the upper circulation pipe liquid-state high-temperature ascending section can be better ensured. The circulation inlet of the condensing side of the circulation-assisted condenser is arranged at a high position, and the low-temperature heat transfer medium of the liquid-state low-temperature ascending section of the lower circulation pipe enters from the high position of the circulation-assisted condenser to be beneficial to the condensation of the vapor-state heat transfer medium at the condensing side. The volume of the circulation-assisted condenser can be reduced to the maximum extent by the same height of the circulation outlet of the condensed side and the circulation inlet of the condensing side.
The expansion device is arranged on the top of the condensation side and integrated with the condensation side or connected to the top of the condensation side and kept open with the condensed side, the expansion device and the condensation side are kept open, and the heat transfer medium on the condensation side is kept in a liquid state all the time, so that the pressure communication of the heat collection circulation loop is ensured.
The expansion device is arranged on the top of the condensed side and integrated with the condensed side or connected to the top of the condensed side and kept open with the condensed side, the expansion device and the condensed side are kept open, once heat transfer medium steam rises to the circulating outlet of the condensed side, the heat transfer medium steam can directly enter the expansion device, and the heat transfer medium steam can be prevented from entering the liquid state high-temperature section of the upper circulating pipe. When expansion device and by the condensation side keep open, thermal-arrest circulation system's working liquid level should be higher than the condensation side, ensures to be by the pressure head of condensation side circulation direction to condensation side, prevents that condensation side heat transfer medium from keeping condensation side heat transfer medium liquid state throughout because of siphon vaporization when condensation side and by condensation side difference in temperature undersize, ensures that thermal-arrest circulation circuit pressure link up.
Drawings
The invention will be described in further detail below with reference to the following figures and detailed description, wherein:
fig. 1 is a schematic diagram of a vapor-liquid circulation solar water heater.
Detailed Description
The vapor-liquid circulation solar water heater shown in figure 1 is formed by connecting a heat collector (1), a heat storage water tank (2), a heat exchanger (3), a thermostatic valve (4), an exhaust device (5), a circulation-assisting condenser (6), a non-condensable gas discharge channel (7) and a heat blocking structure (13) through a circulation pipeline, wherein the circulation-assisting condenser and the expansion device are of an integral structure, the expansion device and a condensation side are in the same container, the condensed side is arranged at the lower part of the container, an expansion space for boiling or back-discharging of a heat transfer medium of the heat collector is reserved at the upper part of the container, meanwhile, the volume of the container can meet the requirement that the working liquid level of a heat collection circulation system is equal to or higher than that of the heat collection circulation loop, the expansion device is arranged above the working liquid level of the heat collection circulation system, the. The heat exchanger is arranged in the heat storage water tank, and the vapor-liquid high-temperature ascending section (8) of the upper circulating pipe is connected with the circulating outlet of the heat collector and the circulating inlet of the condensed side of the circulation-assisted condenser; the upper circulating pipe liquid high-temperature traveling section (9) is connected with a circulating outlet at the condensed side of the circulation-assisted condenser and a circulating inlet of the heat exchanger; the liquid low-temperature ascending section (10) of the lower circulating pipe is connected with a circulating outlet of the heat exchanger and a circulating inlet at the condensing side of the circulation-assisted condenser; the liquid high-temperature traveling section (11) of the lower circulating pipe is connected with a circulating outlet at the condensing side of the circulation-assisted condenser and a circulating inlet of the heat collector to form a heat collecting circulating loop. The non-condensable gas discharge channel is a micropore channel, the highest point of the upper circulating pipe is connected with the expansion device, the expansion device overheating prevention valve (12) is further arranged, and the overheating prevention valve of the expansion device adopts a thermosensitive mechanical valve. The working liquid level of the heat collection circulating system is set to be higher than that of the heat collection circulating loop, the expansion space of the expansion device is set to be equal to the return displacement of the heat collector, and the liquid level line (14) represents the liquid level of the injected heat transfer medium. The exhaust device adopts a one-way valve with better sealing performance, and the thermostatic valve adopts a thermosensitive mechanical valve and is arranged at the circulating outlet of the heat exchanger.
After the system is installed, the exhaust device is detached, a set amount of heat transfer medium is injected, the heat transfer medium is injected into the expansion device and then enters the heat collection circulation loop through the lower circulation tube, the heat transfer medium enters the upper circulation tube, air of the upper circulation tube is slowly discharged into the expansion device through the non-condensable gas discharge channel, finally, all the air of the upper circulation tube is discharged, the heat transfer medium is fully injected into the upper circulation tube, and the heat collection circulation loop is fully injected with the heat transfer medium and communicated under pressure. The liquid level of the heat transfer medium with set amount is just at the liquid level line position after the heat transfer medium is filled, the expansion space of the expansion device is just equal to the return discharge capacity of the heat collector, and the heat transfer medium returns to the exhaust device after the heat transfer medium is filled. (check valve)
After the heat transfer medium is filled, water is not filled into the heat storage water tank, the heat collector is radiated by the sun, the heat transfer medium in the heat collector reaches boiling point and boils, the heat collection circulation loop generates circulation power, heat collection circulation is started, vapor-liquid mixed high-temperature heat transfer medium enters the circulation-assisted condenser to be condensed, the vapor-state heat transfer medium is condensed and simultaneously heats the heat transfer medium at the condensing side of the circulation-assisted condenser, the condensed liquid-state high-temperature heat transfer medium enters the heat exchanger through the liquid-state high-temperature ascending section of the upper circulation pipe, the liquid-state low-temperature heat transfer medium after heat exchange enters the condensing side of the circulation-assisted condenser through the liquid-state low-temperature ascending section of the lower circulation pipe, and the heated liquid-state high-temperature heat transfer medium. When the thermostatic valve reaches the set temperature, the thermostatic valve is closed, the pressure generated by the heat transfer medium boiled by the heat collector after the thermostatic valve is closed is used for discharging the heat transfer medium of the heat collector back to the expansion device, the expansion space of the expansion device is just filled when the heat transfer medium in the heat collector is completely discharged, the air in the expansion space is completely discharged through the exhaust device, and the heat collection circulating system enters an overheat protection state. At the moment, the heat collector and the auxiliary circulation condenser have weak circulation through the micropore non-condensable gas discharge channel, and the expansion preventing device is closed when the overheating valve reaches the set temperature, so that the heat transfer medium loss caused by overheating of the expansion device is prevented.
At the moment, water is injected into the heat storage water tank, the thermostatic valve is opened when the temperature is lower than the set temperature, the heat collection circulation loop is opened again, the heat collection circulation loop is started again, and the heat collection circulation loop forms a vacuum negative pressure system because all air of the heat collection circulation system is exhausted, so that the heat collection circulation system enters the optimal working state.
Claims (6)
1. The utility model provides a vapour-liquid circulation solar water heater, thermal-arrest circulation system are vacuum negative pressure system, constitute by heat collector, heat storage water tank, heat exchanger, thermostatic valve, expansion device, exhaust apparatus, and wherein the heat exchanger is established and is connected formation thermal-arrest circulation circuit, its characterized in that by circulation line and heat collector at heat storage water tank: a circulation-assisting condenser is arranged at a position equal to or higher than the heat collector, the heat storage water tank is lower than the heat collector, the circulation-assisting condenser is a simple condenser, a circulation outlet of the heat collector is connected with a circulation inlet of the heat exchanger through a condensed side, and a circulation outlet of the heat exchanger is connected with a circulation inlet of the heat collector through a condensing side to form a heat collection circulation loop;
the upper circulating pipe is divided into a vapor-liquid high-temperature ascending section and a liquid-state high-temperature ascending section, the lower circulating pipe is divided into a liquid-state low-temperature ascending section and a liquid-state high-temperature ascending section, the heat collector side of the circulation-assisted condenser is connected with the vapor-liquid high-temperature ascending section of the upper circulating pipe and the liquid-state high-temperature ascending section of the lower circulating pipe, and the heat storage water tank side of the circulation-assisted condenser is connected with the liquid-state high-temperature ascending section of the upper circulating pipe;
The thermostatic valve is arranged on the heat collection circulation loop to control the on and off of the heat collection circulation loop; the expansion device is arranged at the highest point of the heat collection circulating system, the exhaust device is arranged at the highest point of the expansion device, the expansion space of the expansion device is equal to or smaller than the return displacement of the heat collector, the heat collection circulating system is of a good exhaust structure, non-condensable gas exhaust channels are arranged between the highest point of the upper circulating pipe and the lower circulating pipe and the expansion device, and at least one non-condensable gas exhaust channel is connected with the expansion device through a micropore or a valve;
the working liquid level of the heat collection circulating system is equal to or higher than that of the heat collection circulating loop.
2. The vapor-liquid circulation solar water heater according to claim 1, wherein the circulation-assisting condenser is arranged at a low position by the condensation-side circulation inlet, and the circulation outlet is arranged at a high position.
3. A vapor-liquid circulating solar water heater according to claim 1, wherein the expansion means is provided on top of the condensing side integrally with the condensing side and is kept open to the condensing side.
4. A vapor-liquid circulating solar water heater according to claim 1, wherein the expansion means is connected on top of the condensation side and is open to the condensation side.
5. A vapor-liquid circulating solar water heater according to claim 1, wherein the expansion means is provided on top of the side to be condensed so as to be integrated with the side to be condensed and to be kept open to the side to be condensed.
6. A vapor-liquid circulating solar water heater according to claim 1, wherein the expansion means is connected to the top of the condensed side and is kept open to the condensed side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910365764.3A CN111854181A (en) | 2019-04-24 | 2019-04-24 | Vapor-liquid circulation solar water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910365764.3A CN111854181A (en) | 2019-04-24 | 2019-04-24 | Vapor-liquid circulation solar water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111854181A true CN111854181A (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910365764.3A Pending CN111854181A (en) | 2019-04-24 | 2019-04-24 | Vapor-liquid circulation solar water heater |
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| Country | Link |
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| CN (1) | CN111854181A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2504570Y (en) * | 2001-10-12 | 2002-08-07 | 施展 | Solar hot water air conditioner |
| CN201242296Y (en) * | 2008-07-08 | 2009-05-20 | 盛林君 | Split pressure-bearing splitting solar water heater |
| CN104676920A (en) * | 2013-11-28 | 2015-06-03 | 刘建榕 | Auto-exhaust intermittent natural circulation solar water heater |
| CN105258359A (en) * | 2015-08-18 | 2016-01-20 | 刘建榕 | Vapor-liquid circulation type solar water heater |
| CN105509336A (en) * | 2015-12-23 | 2016-04-20 | 安徽建筑大学 | Vacuum tube type solar heat pump hot-water system |
-
2019
- 2019-04-24 CN CN201910365764.3A patent/CN111854181A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2504570Y (en) * | 2001-10-12 | 2002-08-07 | 施展 | Solar hot water air conditioner |
| CN201242296Y (en) * | 2008-07-08 | 2009-05-20 | 盛林君 | Split pressure-bearing splitting solar water heater |
| CN104676920A (en) * | 2013-11-28 | 2015-06-03 | 刘建榕 | Auto-exhaust intermittent natural circulation solar water heater |
| CN105258359A (en) * | 2015-08-18 | 2016-01-20 | 刘建榕 | Vapor-liquid circulation type solar water heater |
| CN105509336A (en) * | 2015-12-23 | 2016-04-20 | 安徽建筑大学 | Vacuum tube type solar heat pump hot-water system |
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