CN101666547A - Anti-freezing cyclic solar heat collecting system with small flow - Google Patents
Anti-freezing cyclic solar heat collecting system with small flow Download PDFInfo
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- CN101666547A CN101666547A CN 200810177955 CN200810177955A CN101666547A CN 101666547 A CN101666547 A CN 101666547A CN 200810177955 CN200810177955 CN 200810177955 CN 200810177955 A CN200810177955 A CN 200810177955A CN 101666547 A CN101666547 A CN 101666547A
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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
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Abstract
The invention provides an anti-freezing cyclic solar heat collecting system with small flow, which comprises a water tank (2) and a heat collector (1). The lower part of the water tank is connected with the heat collector by a lower cyclic pipeline pipe (62) of the water tank. The upper part of the water tank is connected with the heat collector by an upper cyclic pipeline pipe (61) of the water tank. A small flow pump (72) is connected in parallel with the lower cyclic pipeline pipe of the water tank. A temperature controlled sensor (83) is arranged on the lower cyclic pipeline or the upper cyclic pipeline of the water tank. According to the on and off of the small flow pump (72) controlled by signals acquired by the temperature controlled sensor (83), when the pipeline water temperatureapproaches freezing temperature, the small flow pump is started for the clearance anti-freezing cycle of the solar heat collecting system so as to ensure the liquid in the cyclic pipeline from not being frozen.
Description
Technical field
The present invention relates to a kind of forced circulation solar thermal collection system, the solar thermal collection system of the freeze proof circulation of band low discharge of the antifreeze use of particularly a kind of suitable cold district.
Background technology
In the existing solar thermal collection system, the water that is exposed in the outdoor pipeline of cold district (comprising the pipeline of water tank downcomer, water tank upper hose and heat collector etc.) can be because winter temperature be crossed low and icing, cause and freeze stifledly, even bursting by freezing can not use, and uses to the user and causes greater loss.
Under prior art, freeze stifled problem at above-mentioned, adopt electrical heating antifreezing and pipeline evacuation and anti-freezing and three kinds of solutions of forced circulation regularly usually.First method is to install the electric tracing line outside pipeline additional, and water temperature may cause near 2 ℃ and freeze when stifled in detecting pipeline, and it is stifled to avoid pipeline to freeze to the heating of pipeline outer wall to start this electric tracing line automatically.In this scheme, enable the electric tracing line and need consume more electric energy, and passing in time, the start-up temperature detection sensitivity of electric tracing line can reduce, in most of the cases, the start-up temperature of open and close controlling can raise gradually, makes antifreeze cost rise significantly.
Second method under the prior art is: winter is with the solar thermal collection system water emptying in advance in the pipeline out of doors.As Chinese patent ZL 200720022549.6 (denomination of invention: the solar water heater with defroster) just provide solar water heater with defroster, the heat collector water pipe stretches out that pipe is connected with evacuated tube on the pipeline of water tank part, and the tail end of evacuated tube is equipped with exhaust-valve; When opening exhaust-valve, the water in the solar thermal collector pipeline is out of doors drained, thereby prevents that water is frozen in water pipe from freezing crack in the pipeline.Yet in this scheme, also must make the whole emptyings of the water in the solar thermal collection system pipeline heat wherein also loose in antifreeze, the temperature of recirculated water be difficult to obtain accumulation thereupon, and the efficient of annual solar energy heating is also on the low side significantly; In addition, the water temperature in the water tank of the long-term emptying water storage of system is higher, and bacterial growth is difficult to be suppressed, and is difficult to reach the hygienic quality that secondary cycle thermal-arrest mode is made hot water.
The third method is to adopt forced circulation antifreeze, regularly forced circulation is pre-antifreeze stifled to outdoor pipeline heat transfer solution promptly to utilize solar energy heating forced circulation water pump, in this scheme, because solar thermal collection system forced circulation pump load is big, often be in and start and "on" position will consume wearing and tearing and reduction service life of too much electric energy, increase forced circulation water pump, reduce the reliability of solar heat collecting and circulating system, in case the forced circulation water pump breaks down, heat collector and pipeline will be damaged by bursting by freezing also will.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is, the solar thermal collection system of the freeze proof circulation of a kind of band low discharge simple in structure, wieldy is provided.
For this reason, the invention provides a kind of solar thermal collection system with the freeze proof circulation of low discharge, comprise water tank, heat collector, the water tank bottom connects heat collector by circulation line under the water tank, water tank upper connects heat collector by water tank cocycle pipeline, and circulation line is parallel with low-capacity pump under the water tank; On circulation line or the water tank cocycle pipeline temperature control sensor is housed also under the water tank, the open and close of the signal controlling low-capacity pump of gathering according to described temperature control sensor.
The solar thermal collection system of the freeze proof circulation of band low discharge of the present invention is in "on" position all the time, owing on the water tank downcomer pipeline of water tank bottom, a low-capacity pump is installed, when the pipeline water temperature is lower than solidification point, during as-0.5 ℃, low-capacity pump starts, force to promote liquid (general heat-transfer working medium is a water) and between heat collector and water tank, constantly circulate, carry out the freeze proof circulation of intermittence of solar thermal collection system, do not allow liquid calm down and form and freeze.
In addition, owing in the water tank of solar thermal collection system heat-insulation layer is arranged, so the fluid temperature of water tank is generally higher.By the freeze proof circulation of the intermittence of above-mentioned solar thermal collection system, just can make and be always the higher liquid of temperature in the solar thermal collection system pipeline, also effectively contained the generation of freezing.
Therefore, the solar thermal collection system of the freeze proof circulation of band low discharge of the present invention can ensure that the liquid that can not in the cold district winter solar energy collecting system pipeline freezes.
Solar thermal collection system of the present invention can be natural cycle system, promptly utilizes solar energy to make the system of system's transfer working medium in heat natural natural circulation heating between heat collector and water tank.The thermosyphon action that the density variation that the power of systemic circulation causes for the heat-transfer working medium temperature difference causes.But when the fluid temperature of pipeline was low, when following, because the effect of low-capacity pump, natural cycle system was forced to circulate, thereby changes forced circulation system into as solidification point (as freezing point ,-0.5 ℃).
Certainly, solar thermal collection system of the present invention can be forced circulation system, promptly utilizes the forced circulation water pump to make system get the system of heat forced circulation heat-transfer working medium heating according to collecting system.At this moment, low-capacity pump and forced circulation water pump are connected in parallel on the water tank downcomer pipeline.As everyone knows, in above-mentioned pressure solar thermal collection system, we also can utilize the solution of forced circulation water pump to freeze stifled problem (being prior art): solar thermal collection system is in "on" position all the time, when the fluid temperature of pipeline is lower than solidification point (as freezing point ,-0.5 ℃), the forced circulation pump working, carry out forced circulation, force to promote liquid and between heat collector and water tank, constantly circulate, do not allow liquid calm down and form and freeze.In addition, owing in the water tank of solar thermal collection system heat-insulation layer is arranged, so the fluid temperature of water tank is generally higher.So just can make and be always the higher liquid of temperature in the solar thermal collection system pipeline, also effectively contain the generation of freezing.
Yet, when solar thermal collection system of the present invention is forced circulation system, under the antifreeze situation of needs, be to utilize low-capacity pump to carry out forced circulation, and the forced circulation water pump is not worked.The output flow of low-capacity pump is less than or equal to 1/10th of the specified output flow of forced circulation water pump.Obviously, low-capacity pump power is compared with the forced circulation water pump, little is many, general low-capacity pump has only several watts, and the forced circulation water pump needs dozens or even hundreds of watt, like this, replace the forced circulation water pump by low-capacity pump, can reach the antifreeze purpose of pipeline, have energy loss less greatly, thereby reach purpose of energy saving.
Above-mentioned low-capacity pump also can be immersible pump, is arranged in the liquid container of sealing, and circulation line is in parallel under the two ends of liquid container and water tank.Immersible pump is better cooled off in liquid as low-capacity pump, has not only increased the service life of pump itself, and the heat that itself has produced when more having made full use of pump work comes liquid in the heating pipe line, thereby further contained the generation of freezing.
In addition, when solar thermal collection system of the present invention is forced circulation system, if it is antifreeze to adopt the forced circulation water pump, then the forced circulation water pump will be in round-the-clock operating condition.Any equipment all has service life, and entire equipment all is the time that be used for work for the time that antifreeze oneself consumes.With regard to the situation of China, 1 year nearly about 1/6 time was in low temperature, and this time of 1/6 all wants forced circulation antifreeze, pressed solar facilities and calculated 15 years projected lives, and the forced circulation water pump then will shorten 2.5 years if participation is antifreeze service life.In addition, under the lower situation of pipeline fluid temperature, in a single day the forced circulation water pump breaks down, and pipeline will be damaged by bursting by freezing.When solar thermal collection system of the present invention is forced circulation system, under the antifreeze situation of needs, be to utilize low-capacity pump to carry out forced circulation, and the forced circulation water pump is in resting state, the problems referred to above will no longer exist.
Solar thermal collection system of the present invention for effectively alleviating the influence of variations in temperature to system, also is provided with the level pressure expansion drum on circulation line or the water tank cocycle pipeline under water tank when antifreeze operation.
Obviously, solar thermal collection system of the present invention, both can be direct-type solar thermal collection system (solar thermal collection system of circulating solar energy collecting system, secondary heat exchange), also can be indirect type solar thermal collection system (solar thermal collection system of secondary cycle solar thermal collection system, secondary heat exchange).The direct-type solar thermal collection system is meant and directly adds the system that hot water is supplied with the user in solar thermal collector.The indirect type solar thermal collection system is meant certain heat-transfer working medium of heating in solar thermal collector, utilize heat-transfer working medium to pass through the system that the heat exchanger heats system supplies with the user again, the water tank that adopts in the indirect type solar thermal collection system can be the secondary heat exchange water tank also, helps ensureing the sanitary index of hot water.
Description of drawings
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the principle schematic of a kind of solar thermal collection system embodiment one with the freeze proof circulation of low discharge of the present invention;
Fig. 2 is the principle schematic of a kind of solar thermal collection system embodiment two with the freeze proof circulation of low discharge of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Fig. 1 illustrates a kind of solar thermal collection system embodiment one with the freeze proof circulation of low discharge of the present invention, is the forced circulation solar thermal collection system, also is the secondary cycle solar thermal collection system.This solar thermal collection system comprises water tank 2, heat collector 1.Water tank 2 adopts the enclosed water tank, and top has safety valve 21.Water tank 2 bottoms connect heat collector 1 by circulation line under the water tank 62, and water tank 2 tops connect heat collector 1 by water tank cocycle pipeline 61.Low-capacity pump 72 in parallel is housed on the circulation line 61 under the water tank, under the water tank in the circulation line 62 exit near water tank 2 forced circulation water pump 71 also is installed, low- capacity pump 72 and 71 parallel connections of forced circulation water pump are provided with a check valve 73 before the low-capacity pump 72.Heat collector temperature sensor 81 is installed in the heat collector 1, water tank temperature sensor 82 is installed in the water tank, on circulation line or the cocycle pipeline temperature control sensor 83 is housed also under the water tank, the open and close of control low-capacity pump, during near solidification point, open the freeze proof circulation of intermittence that this low-capacity pump carries out solar thermal collection system in the pipeline water temperature.Low-capacity pump power is compared with the forced circulation water pump, and little is many, and the output flow of low-capacity pump is less than or equal to and forces 1/10th of the specified output flow of forced circulation water pump.General low-capacity pump has only several watts, and the forced circulation water pump needs dozens or even hundreds of watt at least, replaces the forced circulation water pump by low-capacity pump, can reach the antifreeze purpose of pipeline, has had energy loss less greatly, thereby reaches purpose of energy saving.
The water tank that adopts in the solar thermal collection system of present embodiment is the secondary heat exchange water tank, helps ensureing the sanitary index of hot water.
The top of water tank 2 also has the outlet pipe 3 that uses hot water, and the hot water of water tank 2 top memory can use the outlet pipe 3 of hot water to flow out by this; Water tank 2 bottoms are equipped with cold water feed pipe 4, and this cold water feed pipe 4 is used to connect external water source.In addition, in this solar thermal collection system, water tank 2 tops have safety valve 21, and circulation line 62 is provided with level pressure expansion drum 5 under the water tank that forced circulation water pump 71 and water tank are 2, and whole system also has control elements such as controller.
The course of work of a kind of solar thermal collection system with the freeze proof circulation of low discharge shown in Figure 1 is as follows: detect the heat collector temperature and differ some temperature (setting value when water tank temperature sensor 82 detects water tank temperature and heat collector temperature sensor 81, as 5 ℃) time, 71 work of controller control forced circulation water pump, forced circulation water pump 71 takes out the liquid of water tank 2 bottoms to heat collector 1, flowing liquid is taken away the heat pipe heat that passes through solar energy heating in the heat collector 1, and the top of process water tank upper circular tube 61 inflow water tanks 2, water tank 2 tops will produce hot water like this.When the temperature of heat collector 1 was reduced to certain predetermined temperature, forced circulation water pump 71 stopped.
Winter is when the reduction of pipeline water temperature, as be lower than and subscribe antifreeze temperature (as freezing point: during 0.5 ℃ of left and right sides,) time, carry out antifreeze forced circulation by temperature control sensor 83 control low-capacity pumps unlatchings, force to promote liquid and between heat collector and water tank, constantly slowly circulate, do not allow liquid calm down and form and freeze.In addition, since night in winter water tank the liquid temperature generally be higher than outdoor water tank circulation line and heat collector.So just can make to remain the liquid that is higher than solidification point in the solar thermal collection system pipeline, effectively contain the generation of freezing.
Fig. 2 illustrates a kind of solar thermal collection system embodiment two with the freeze proof circulation of low discharge of the present invention, is the Natural Circulation solar thermal collection system.This solar thermal collection system comprises water tank 2, heat collector 1.Water tank 2 is an open tank, and top has vent valve 20.Water tank 2 bottoms connect heat collector 1 by circulation line under the water tank 62 and carry out the Natural Circulation solar energy heating.Water tank 2 tops connect heat collector 1 by water tank cocycle pipeline 61; Have valve 70 on the water tank downcomer 62, low-capacity pump simultaneously in parallel is an immersible pump 75, be arranged in the liquid container 74 of sealing, and, circulation line 62 is in parallel under the two ends of liquid container 74 and water tank.Be provided with a check valve 73 before the immersible pump 75.Heat collector temperature sensor 81 is installed in the heat collector 1, water tank temperature sensor 82 is installed in the water tank, on circulation line or the cocycle pipeline temperature control sensor 83 is housed also under the water tank, the open and close of control immersible pump 75.
A kind of solar thermal collection system shown in Figure 2 with the freeze proof circulation of low discharge, its antifreeze course of work is as follows: solar thermal collection system is in "on" position all the time, when the pipeline water temperature, as be lower than solidification point when (as freezing point ,-0.5 ℃), valve 70 on the water tank downcomer 62 starts by, immersible pump 75, carries out forced circulation, force to promote water and between heat collector and water tank, constantly circulate, do not allow level become quiet and form and freeze.In addition, owing in the water tank of solar thermal collection system heat-insulation layer is arranged, so the water temperature of water tank is generally higher.So just can make and be always the higher water of temperature in the solar thermal collection system pipeline, also effectively contain the generation of ice.Immersible pump 75 is better cooled off in liquid as low-capacity pump, has not only increased the service life of pump itself, and the heat that itself has produced when more having made full use of pump work comes liquid in the heating pipe line, thereby further contained the generation of freezing.
Higher when the pipeline water temperature, as when being higher than solidification point, do not need to carry out anti-frost protection, valve 70 conductings on the water tank downcomer 62 are just this solar thermal collection system is the Natural Circulation solar thermal collection system of normality.
The solar thermal collection system of embodiment two is the direct-type solar thermal collection system, promptly directly adds the system that hot water is supplied with the user in the solar thermal collector.
Claims (10)
1, a kind of solar thermal collection system with the freeze proof circulation of low discharge, comprise water tank (2), heat collector (1), the water tank bottom connects heat collector by circulation line under the water tank (62), water tank upper connects heat collector by water tank cocycle pipeline (61), it is characterized in that: and circulation line is parallel with low-capacity pump (72) under the water tank; On circulation line or the water tank cocycle pipeline temperature control sensor (83) is housed also under the water tank, the open and close of the signal controlling low-capacity pump of gathering according to described temperature control sensor (83) (72).
2, a kind of solar thermal collection system with the freeze proof circulation of low discharge as claimed in claim 1 is characterized in that: the preceding check valve (73) that also is provided with of described low-capacity pump (72).
3, a kind of solar thermal collection system with the freeze proof circulation of low discharge as claimed in claim 1, it is characterized in that: described solar thermal collection system is a natural cycle system, also has valve (70) in parallel with low-capacity pump (72) under the water tank on the circulation line.
4, a kind of solar thermal collection system as claimed in claim 1 with the freeze proof circulation of low discharge, it is characterized in that: described solar thermal collection system is a forced circulation system, also has forced circulation water pump (71) in parallel with low-capacity pump (72) on the following circulation line of water tank.
5, as claim 3 or 4 described a kind of solar thermal collection systems with the freeze proof circulation of low discharge, it is characterized in that: described solar thermal collection system is direct-type solar thermal collection system or indirect type solar thermal collection system.
6, a kind of solar thermal collection system with the freeze proof circulation of low discharge as claimed in claim 5, it is characterized in that: the water tank that adopts in the described indirect type solar thermal collection system is the secondary heat exchange water tank.
7, a kind of solar thermal collection system with the freeze proof circulation of low discharge as claimed in claim 4 is characterized in that: also be provided with level pressure expansion drum (5) on circulation line or the water tank cocycle pipeline under the water tank of this solar thermal collection system.
8, a kind of solar thermal collection system with the freeze proof circulation of low discharge as claimed in claim 4 is characterized in that: the output flow of described low-capacity pump (72) is less than or equal to forces 1/10th of the specified output flow of forced circulation water pump (71).
9, a kind of solar thermal collection system with the freeze proof circulation of low discharge as claimed in claim 2 is characterized in that: described low-capacity pump (72) is an immersible pump (75).
10, a kind of solar thermal collection system as claimed in claim 9 with the freeze proof circulation of low discharge, it is characterized in that: described immersible pump (75) is arranged in the liquid container (74) of sealing, and circulation line is in parallel under the two ends of aforesaid liquid container (74) and water tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810177955.9A CN101666547B (en) | 2008-09-02 | 2008-11-18 | Anti-freezing cyclic solar heat collecting system with small flow |
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| CN200810212593.2 | 2008-09-02 | ||
| CN200810212593 | 2008-09-02 | ||
| CN200810177955.9A CN101666547B (en) | 2008-09-02 | 2008-11-18 | Anti-freezing cyclic solar heat collecting system with small flow |
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| CN101666547A true CN101666547A (en) | 2010-03-10 |
| CN101666547B CN101666547B (en) | 2014-01-15 |
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| CN200810177955.9A Expired - Fee Related CN101666547B (en) | 2008-09-02 | 2008-11-18 | Anti-freezing cyclic solar heat collecting system with small flow |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912987A (en) * | 2014-03-30 | 2014-07-09 | 山东耀国光热科技股份有限公司 | Intermediate-temperature heat collecting and utilizing system with energy storage tank |
| CN106556159A (en) * | 2016-11-23 | 2017-04-05 | 合肥贺博教育科技有限公司 | A kind of solar water heater for carrying two storage tanks |
| CN108800290A (en) * | 2018-06-11 | 2018-11-13 | 西藏自治区能源研究示范中心 | A kind of solar energy massive plate heating system of the auxiliary energy of band |
| CN114811710A (en) * | 2022-05-10 | 2022-07-29 | 兰州理工大学 | Ecological lavatory system of combined heat and power marsh gas production |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1111688C (en) * | 1999-06-01 | 2003-06-18 | 方俊杰 | Forced circulation type water circulation control method for solar energy water heater |
| CN2443293Y (en) * | 2000-06-02 | 2001-08-15 | 杨德山 | Double energy source water heating system device |
| CN2773558Y (en) * | 2005-01-25 | 2006-04-19 | 北京桑尼玻璃制品有限责任公司 | Pressurized solar water heater with separated circulation |
| CN1313779C (en) * | 2005-09-25 | 2007-05-02 | 山东华元建设集团技术研究开发中心 | Technical method and apparatus for intelligent heating and water-heating utilizing solar energy |
| CN201293470Y (en) * | 2008-09-04 | 2009-08-19 | 潘戈 | Freeze proof solar thermal collection system |
-
2008
- 2008-11-18 CN CN200810177955.9A patent/CN101666547B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912987A (en) * | 2014-03-30 | 2014-07-09 | 山东耀国光热科技股份有限公司 | Intermediate-temperature heat collecting and utilizing system with energy storage tank |
| CN106556159A (en) * | 2016-11-23 | 2017-04-05 | 合肥贺博教育科技有限公司 | A kind of solar water heater for carrying two storage tanks |
| CN108800290A (en) * | 2018-06-11 | 2018-11-13 | 西藏自治区能源研究示范中心 | A kind of solar energy massive plate heating system of the auxiliary energy of band |
| CN114811710A (en) * | 2022-05-10 | 2022-07-29 | 兰州理工大学 | Ecological lavatory system of combined heat and power marsh gas production |
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