CN101666547B - Anti-freezing cyclic solar heat collecting system with small flow - Google Patents

Anti-freezing cyclic solar heat collecting system with small flow Download PDF

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Publication number
CN101666547B
CN101666547B CN200810177955.9A CN200810177955A CN101666547B CN 101666547 B CN101666547 B CN 101666547B CN 200810177955 A CN200810177955 A CN 200810177955A CN 101666547 B CN101666547 B CN 101666547B
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water tank
solar thermal
collection system
thermal collection
circulation
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CN200810177955.9A
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CN101666547A (en
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潘戈
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潘戈
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/44Heat exchange systems

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 temperature approaches 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

A kind of solar thermal collection system with the freeze proof circulation of low discharge
Technical field
The present invention relates to a kind of forced circulation solar thermal collection system, particularly the solar thermal collection system with the freeze proof circulation of low discharge of the antifreeze use of a kind of suitable cold district.
Background technology
In existing solar thermal collection system, the water being 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 too low and icing due to winter temperature, cause frozen block, even bursting by freezing can not be used, and to user, uses and causes greater loss.
Under prior art, for above-mentioned frozen block problem, conventionally adopt the antifreeze and three kinds of solutions of forced circulation regularly of electrical heating antifreezing and pipeline evacuation.First method is to install electric tracing line outward additional at pipeline, and in pipeline being detected, water temperature approaches 2 ℃ may cause frozen block time, automatically starts this electric tracing line pipeline outer wall is heated to avoid pipeline frozen block.In this scheme, enable electric tracing line and need to 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 significantly increase.
Second method under prior art is: winter, the water in pipeline was emptying in advance out of doors by solar thermal collection system.As Chinese patent ZL200720022549.6 (denomination of invention: the solar water heater with defroster) just provide the solar water heater with defroster, heat collector water pipe stretches out pipe on water tank pipeline partly and is connected with evacuated tube, and the tail end of evacuated tube is provided with exhaust-valve; While opening exhaust-valve, the water in solar thermal collector pipeline is out of doors drained, thereby prevents that in pipeline, water is frozen in water pipe from freezing crack.Yet in this scheme, also must the water in solar thermal collection system pipeline is all emptying in antifreeze, make heat wherein also thereupon loose, the temperature of recirculated water is difficult to be accumulated, and the efficiency 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 the more difficult inhibition of bacterial growth 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, utilize solar energy heating forced circulation water pump timing forced circulation to conduct heat and solve prevention frozen block to outdoor pipeline, in this scheme, because solar thermal collection system forced circulation pump load is large, often in startup and "on" position, will consume too much electric energy, and increase the wearing and tearing of forced circulation water pump and reduce service life, reduce the reliability of solar heat collecting and circulating system, once forced circulation water pump breaks down, heat collector and pipeline will be damaged by bursting by freezing also will.
Summary of the invention
For above-mentioned defect, the technical problem that the present invention solves is, a kind of solar thermal collection system with the freeze proof circulation of 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, water tank bottom connects heat collector by circulation line under water tank, water tank upper connects heat collector by water tank cocycle pipeline, and under water tank, circulation line is parallel with low-capacity pump; Under water tank, on circulation line or water tank cocycle pipeline, temperature control sensor is also housed, the open and close of the signal controlling low-capacity pump gathering according to described temperature control sensor.
Solar thermal collection system with the freeze proof circulation of low discharge of the present invention is all the time in "on" position, owing on the water tank downcomer pipeline in water tank bottom, a low-capacity pump being installed, when 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 water) and constantly circulate between heat collector and water tank, 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, in the water tank due to solar thermal collection system, there is heat-insulation layer, so the fluid temperature of water tank is generally higher.By the freeze proof circulation of intermittence of above-mentioned solar thermal collection system, just can make to be always the liquid that temperature is higher in solar thermal collection system pipeline, also effectively contained the generation of freezing.
Therefore, the solar thermal collection system with the freeze proof circulation of low discharge of the present invention, can ensure that the liquid in cold district winter solar energy collecting system pipeline can not freeze.
Solar thermal collection system of the present invention can be natural cycle system, utilizes solar energy to make the system of system transfer working medium in heat natural circulation heating between heat collector and water tank.The power of systemic circulation is the thermosyphon action that density variation that heat-transfer working medium temperature difference causes causes.But when the fluid temperature of pipeline is lower, when as following in solidification point (as freezing point ,-0.5 ℃), due to the effect of low-capacity pump, natural cycle system is forced to circulation, thereby changes forced circulation system into.
Certainly, solar thermal collection system of the present invention can be forced circulation system, utilizes forced circulation water pump to make system according to collecting system, obtain the system of heat forced circulation heat-transfer working medium heating.Now, low-capacity pump and forced circulation water pump are connected in parallel on water tank downcomer pipeline.As everyone knows, in above-mentioned pressure solar thermal collection system, we also can utilize forced circulation water pump to solve frozen block problem (being prior art): solar thermal collection system is all the time in "on" position, when the fluid temperature of pipeline is lower than solidification point (as freezing point ,-0.5 ℃), forced circulation pump working, carry out forced circulation, force to promote liquid and constantly circulate between heat collector and water tank, do not allow liquid calm down and form and freeze.In addition, in the water tank due to solar thermal collection system, there is heat-insulation layer, so the fluid temperature of water tank is generally higher.So just can make to be always the liquid that temperature is higher in 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, in the situation that needs are antifreeze, be to utilize low-capacity pump to carry out forced circulation, and forced circulation water air pump inoperative.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 forced circulation water pump, little is many, general low-capacity pump only has several watts, and forced circulation water pump needs dozens or even hundreds of watt, like this, by low-capacity pump, replace forced circulation water pump, can reach the antifreeze object of pipeline, greatly reduce again energy loss, thereby reach energy-conservation object.
Above-mentioned low-capacity pump can be also immersible pump, is arranged in the liquid container of sealing, and under the two ends of liquid container and water tank, circulation line is in parallel.Immersible pump, as low-capacity pump, by better cooling, has not only increased the service life of pump itself in liquid, and the heat itself producing while more taking full advantage of pump work, carrys out liquid in 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 forced circulation water pump, forced circulation water pump will be in round-the-clock operating condition.Any equipment all has service life, and whole equipment, for the time that antifreeze oneself consumes, is all should be for the time of working.With regard to the situation of China, the time of 1 year nearly 1/6 left and right, this time of 1/6 all will be forced circulation anti-freezing in low temperature, pressed solar facilities and calculated 15 years projected lives, antifreeze if forced circulation water pump participates in, and will shorten 2.5 years service life.In addition, in the situation that pipeline fluid temperature is lower, once forced circulation water pump breaks down, pipeline will be damaged by bursting by freezing.When solar thermal collection system of the present invention is forced circulation system, in the situation that needs are antifreeze, be to utilize low-capacity pump to carry out forced circulation, and 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, when antifreeze operation, for effectively alleviating the impact of variations in temperature on system, is also provided with level pressure expansion drum on circulation line or water tank cocycle pipeline under water tank.
Obviously, solar thermal collection system of the present invention, both can be direct-type solar thermal collection system (solar thermal collection system of a circulating solar energy collecting system, a heat exchange), can be also indirect type solar thermal collection system (solar thermal collection system of secondary cycle solar thermal collection system, secondary heat exchange).Direct-type solar thermal collection system refers to the system of direct heating water supply user in solar thermal collector.Indirect type solar thermal collection system refers to and in solar thermal collector, heats certain heat-transfer working medium, recycling heat-transfer working medium is supplied with user's system by heat exchanger heats system, the water tank adopting in indirect type solar thermal collection system can be also secondary heat exchange water tank, is conducive to ensure the sanitary index of hot water.
accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.
Fig. 1 is the principle schematic of a kind of solar thermal collection system embodiment mono-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 bis-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 object 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 mono-with the freeze proof circulation of low discharge of the present invention, is forced circulation solar thermal collection system, is also secondary cycle solar thermal collection system.This solar thermal collection system comprises water tank 2, heat collector 1.Water tank 2 adopts closed type water tank, and top has safety valve 21.Water tank 2 bottoms connect heat collector 1 by circulation line under water tank 62, and water tank 2 tops connect heat collector 1 by water tank cocycle pipeline 61.Low-capacity pump in parallel 72 is housed on circulation line 61 under water tank, and under water tank, in circulation line 62, the exit near water tank 2 is also provided with forced circulation water pump 71, and low-capacity pump 72 and 71 parallel connections of forced circulation water pump, be provided with a check valve 73 before low-capacity pump 72.Heat collector temperature sensor 81 is installed in heat collector 1, water tank temperature sensor 82 is installed in water tank, under water tank, on circulation line or cocycle pipeline, temperature control sensor 83 is also housed, control the open and close of low-capacity pump, when pipeline water temperature approaches solidification point, open the freeze proof circulation of intermittence that this low-capacity pump carries out solar thermal collection system.Low-capacity pump power is compared with 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 only has several watts, and forced circulation water pump at least needs dozens or even hundreds of watt, by low-capacity pump, replaces forced circulation water pump, can reach the antifreeze object of pipeline, has had energy loss greatly less, thereby reaches energy-conservation object.
The water tank adopting in the solar thermal collection system of the present embodiment is secondary heat exchange water tank, is conducive to ensure 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 be used the outlet pipe 3 of hot water to flow out by this; Water tank 2 bottoms are provided with cold water feed pipe 4, and this cold water feed pipe 4 is for connecting external water source.In addition, in this solar thermal collection system, water tank 2 tops have safety valve 21, under the water tank of 2, forced circulation water pump 71 and water tank, on circulation line 62, are provided with level pressure expansion drum 5, and whole system also has the 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 Fig. 1 is as follows: when water tank temperature sensor 82 detects water tank temperature and heat collector temperature sensor 81, heat collector temperature detected and differ some temperature (setting value, as 5 ℃) time, controller is controlled 71 work of forced circulation water pump, forced circulation water pump 71 pumps to heat collector 1 by the liquid of water tank 2 bottoms, flowing liquid is taken away the heat pipe heat that passes through solar energy heating in heat collector 1, and process water tank upper circular tube 61 flows into the top of water tanks 2, water tank 2 tops will produce hot water like this.When the temperature of heat collector 1 is reduced to certain predetermined temperature, forced circulation water pump 71 stops.
Winter is when the reduction of pipeline water temperature, as lower than subscribing antifreeze temperature (as freezing point: during 0.5 ℃ of left and right,) time, by temperature control sensor 83, control low-capacity pump unlatching and carry out antifreeze forced circulation, force to promote liquid and constantly slowly circulate between heat collector and water tank, do not allow liquid calm down and form and freeze.In addition, due to night in winter water tank liquid temperature generally higher than outdoor water tank circulation line and heat collector.So just can make to remain the liquid higher than solidification point in solar thermal collection system pipeline, effectively contain the generation of freezing.
Fig. 2 illustrates a kind of solar thermal collection system embodiment bis-with the freeze proof circulation of low discharge of the present invention, is Natural Circulation solar thermal collection system.This solar thermal collection system comprises water tank 2, heat collector 1.Water tank 2 is open tank, and top has vent valve 20.Water tank 2 bottoms connect heat collector 1 by circulation line under water tank 62 and carry out Natural Circulation solar energy heating.Water tank 2 tops connect heat collector 1 by water tank cocycle pipeline 61; On water tank downcomer 62, have valve 70, low-capacity pump in parallel is immersible pump 75 simultaneously, be arranged in the liquid container 74 of sealing, and, under liquid container 74 two ends and water tank, circulation line 62 is in parallel.Before immersible pump 75, be provided with a check valve 73.Heat collector temperature sensor 81 is installed in heat collector 1, water tank temperature sensor 82 is installed in water tank, under water tank, on circulation line or cocycle pipeline, temperature control sensor 83 is also housed, control the open and close of immersible pump 75.
A kind of solar thermal collection system with the freeze proof circulation of low discharge shown in Fig. 2, its antifreeze course of work is as follows: solar thermal collection system is all the time in "on" position, when pipeline water temperature, as lower than solidification point when (as freezing point ,-0.5 ℃), valve 70 on water tank downcomer 62 starts by, immersible pump 75, carries out forced circulation, force to promote water and constantly circulate between heat collector and water tank, do not allow level become quiet and form and freeze.In addition, in the water tank due to solar thermal collection system, there is heat-insulation layer, so the water temperature of water tank is generally higher.So just can make to be always the water that temperature is higher in solar thermal collection system pipeline, also effectively contain the generation of ice.Immersible pump 75, as low-capacity pump, by better cooling, has not only increased the service life of pump itself in liquid, and the heat itself producing while more taking full advantage of pump work, carrys out liquid in heating pipe line, thereby further contained the generation of freezing.
When pipeline water temperature is higher, when higher than solidification point, do not need to carry out anti-frost protection, valve 70 conductings on water tank downcomer 62, just the Natural Circulation solar thermal collection system that this solar thermal collection system is normality.
The solar thermal collection system of embodiment bis-is direct-type solar thermal collection system, i.e. direct heating water supply user's system in solar thermal collector.

Claims (10)

1. the solar thermal collection system with the freeze proof circulation of low discharge, comprise water tank (2), heat collector (1), water tank bottom connects heat collector by circulation line under water tank (62), water tank upper connects heat collector by water tank cocycle pipeline (61), it is characterized in that: and under water tank, circulation line is parallel with low-capacity pump (72); Under water tank, on circulation line or water tank cocycle pipeline, temperature control sensor (83) is also housed, the open and close of the signal controlling low-capacity pump (72) gathering according to described temperature control sensor (83).
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 front check valve (73) that is also 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 natural cycle system under water tank, on circulation line, also having valve (70) in parallel with low-capacity pump (72).
4. 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 forced circulation system on the lower circulation line of water tank, also having forced circulation water pump (71) in parallel with low-capacity pump (72).
5. a kind of solar thermal collection system with the freeze proof circulation of low discharge as described in claim 3 or 4, 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, is characterized in that: the water tank adopting in described indirect type solar thermal collection system is 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: under the water tank of this solar thermal collection system, on circulation line or water tank cocycle pipeline, be also provided with level pressure expansion drum (5).
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 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 immersible pump (75).
10. a kind of solar thermal collection system with the freeze proof circulation of low discharge as claimed in claim 9, it is characterized in that: described immersible pump (75) is arranged in the liquid container (74) of sealing, under the two ends of aforesaid liquid container (74) and water tank, circulation line is in parallel.
CN200810177955.9A 2008-09-02 2008-11-18 Anti-freezing cyclic solar heat collecting system with small flow Expired - Fee Related CN101666547B (en)

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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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* Cited by examiner, † Cited by third party
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1275704A (en) * 1999-06-01 2000-12-06 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
CN1743738A (en) * 2005-09-25 2006-03-08 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
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
CN201293470Y (en) * 2008-09-04 2009-08-19 潘戈 Freeze proof solar thermal collection system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1275704A (en) * 1999-06-01 2000-12-06 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
CN1743738A (en) * 2005-09-25 2006-03-08 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

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