CN102734941A - Automatic judgement method for pipe explosion and water leakage of solar water heating system - Google Patents
Automatic judgement method for pipe explosion and water leakage of solar water heating system Download PDFInfo
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- CN102734941A CN102734941A CN2012101876771A CN201210187677A CN102734941A CN 102734941 A CN102734941 A CN 102734941A CN 2012101876771 A CN2012101876771 A CN 2012101876771A CN 201210187677 A CN201210187677 A CN 201210187677A CN 102734941 A CN102734941 A CN 102734941A
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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
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- 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
Abstract
The invention discloses an automatic judgment method for pipe explosion and water leakage of a solar water heating system; firstly, when the solar water heating system is installed to operate normally, and when a solar collector is started through circulation of temperature difference and water yielding at a constant temperature, changes of such parameters as temperature of the solar heater outlet, water level of a water tank, time for reaching a peak water temperature, temperature rise amplitude, cooling time, circulation time and the like are recorded; then, when a water circulating pump or an upper water solenoid valve of a solar thermal collector is started each time, the temperature of the solar thermal collector outlet is collected, and the changes of the temperature of the solar thermal collector outlet and the water level of the water tank are recorded; the acquired data is compared with the record in normal operation, and when obvious changes are discovered, a pipe explosion and water leakage problem appears; the steps can be formulated to be software so as to be installed in the solar system controller; when the pipe explosion and water leakage problem is judged, the controller automatically stops the water circulating pump or the upper water solenoid valve; and the pipe explosion and water leakage of the heat collector can be judged according to the signal acquired by the solar water heating system controller without other measuring devices.
Description
Technical field
The present invention relates to a kind of solar energy utilization technique, especially design a kind of solar water heating system bombing determination methods of leaking.
Background technology
Solar water heating system generally is made up of solar thermal collector or collector array (being designated hereinafter simply as heat collector), water tank, water pump, magnetic valve, pipeline and controller.
As shown in Figure 1, be a kind of relatively exemplary systems, absorb sunshine by heat collector 1 and convert heat energy into; Water in the heating heat collector; When the water temperature T 1 at heat collector 1 top be elevated to water tank in the temperature difference of water temperature T 3 reach set the temperature difference after (as 7 ℃), water pump 3 just starts, and the cold water in the water tank is squeezed into heat collector 1; Eject the hot water in the heat collector 1 come; Be back in the water tank 2, when the water temperature T 1 at heat collector 1 top be reduced to water tank 2 in the temperature difference of water temperature T 3 less than (as 3 ℃) after setting the temperature difference, water pump 3 is out of service.This method of operation is called temperature difference endless form.
As shown in Figure 2, be another kind of exemplary systems, the cold water that different with Fig. 1 is gets into heat collector 1 is not the water in the water tank 2, but running water.The method of operation is difference slightly also, and after heat collector 1 top water temperature T1 is elevated to a certain design temperature (as 50 ℃), last water solenoid valve 4 starts, and running water gets into heat collector, and the hot water in the heat collector 1 is ejected in the water tank 2.When the water temperature T 1 at heat collector 1 top is reduced to design temperature (as 45 ℃), last water solenoid valve 4 is closed, and stops to go up water.This method of operation is called the constant temperature water-out manners.
At present, most solar water heating systems all adopt above-mentioned these two kinds of methods of operation, or the combination of these two kinds of methods of operation, and constant temperature water outlet when being discontented with like water in the water tank transfers temperature difference endless form to after water is full.The hot-water heating system that has adopts the anti-icing fluid operation in heat collector, and comes heat-shift through heat exchanger between the water tank, but also adopts same temperature difference endless form.
In the prior art, heat collector has very mainly by two kinds of forms, i.e. flat plate collector and vacuum tube collector; And vacuum tube collector also has a lot of patterns; Classify according to the flow channel material of water in heat collector, present most systems can be divided into two kinds: a kind of is the vacuum tube collector of water in metal, like U type tubular type vacuum tube collector, heat pipe vacuum tube hot collector etc.; The water of this heat collector is in metal flow passage; Do not contact with glass, if vacuum tube glass is damaged, water can outflow system; Another kind is the vacuum tube collector of water in glass, and like union pipe formula vacuum tube collector, the water of this heat collector directly in glass-vacuum tube, directly contacts with glass, if glass breakage, the water in the pipe can outflow system.Because vacuum tube collector compares with flat board, vacuum insulation function and accurate tracking performance are arranged, its good in thermal property is in the latter, especially the winter in the north; Advantage is more obvious, and therefore, vacuum tube collector has obtained extensive application at home, and the vacuum tube collector of water in metal; Owing to will use a large amount of metals, cost an arm and a leg, therefore, the vacuum tube collector of water in glass; Because of the high advantage of its cost low performance, application quantity is very big at home, almost accounts for about 80% of Chinese solar energy market.
Because the vacuum tube collector of water in glass, glass is in case damaged, and the water in the heat collector will flow out to outside the system; Cause the solar energy system can't operate as normal, if do not find that system works on; With a large amount of water of waste, and surrounding environment caused trouble.
At present, carry out the automatic judgement of bombing and mainly contain following several kinds of determination methods:
1. on the entrance and exit pipeline of heat collector, flowmeter is installed,, is judged whether that bombing leaks through contrasting the flow of two flowmeters.Because large-area hot-water heating system, heat collector main line caliber is all bigger, and the flowmeter price of big caliber is unusual costliness all, and hot water outlet has the incrustation scale blocking problem, causes rate of discharge instrumentation amount error greatly even can't measure, and causes thinking by mistake bombing.
2. at the heat collector port of export flow switch is installed, when heat collector circulation or water outlet,, is thought that then bombing leaks if flow switch is not opened.Because the heat collector outlet temperature is higher, the time has been grown and has had a large amount of incrusted deposits, can cause flow switch to close at last, bombing occurs and also can not report to the police.And in the use of solar water heating system, even most applications is bombing to occur to leak, the heat collector outlet pipe still had current when system moved; Just current are little; And flow switch can't be judged, and will be only more in bombing quantity, leak in a large number; When causing the heat collector rate of discharge very little, could find.
3. the installing electrodes at heat collector union pipe top as long as there is water heat collector inside, forms the conducting loop through water between the electrode.Leak in case bombing occurs, lack of water will appear in the heat collector top, not send the bombing warning because of there being water to form the conducting loop between the electrode.Because the heat collector top is the highest place of temperature in the heat collector, the there will deposit a large amount of incrustation scales, comprise on the electrode also can depositing, and will be final because incrustation scale is blocked up, can't form current loop between the electrode and judge the bombing warning by accident.
Summary of the invention
The purpose of this invention is to provide a kind of measurement device separately that do not need, only judge solar water heating system bombing that the heat collector bombing the is leaked determination methods of leaking according to the signal of solar water heating system controller collection.
The objective of the invention is to realize through following scheme:
The solar water heating system bombing of the present invention automatic judging method that leaks comprises step:
A, when the solar water heating system installation normally moves, when heat collector temperature difference circulation or constant temperature water outlet start, the variation of writing down following parameter:
Heat collector outlet temperature, cistern water level, water temperature arrive the time of peak temperature, the amplitude that temperature raises, the time of cooling, the time of circulation;
B, the water circulating pump of each solar thermal collector or on water solenoid valve when starting, gather the solar thermal collector outlet temperature, and the situation of change of record heat collector outlet temperature and cistern water level;
Record in C, data that step B is obtained and the steps A during normal operation compares, and when the discovery significant change, then confirms to have occurred the bombing seepy question;
D, above-mentioned steps is compiled into software is installed in the solar energy system controller, when being judged as bombing when leaking, controller stops water circulating pump automatically or goes up water solenoid valve.
Technical scheme by the invention described above provides can be known; The solar water heating system bombing of the present invention automatic judging method that leaks; Because with the water circulating pump of each solar thermal collector or when going up water solenoid valve and starting; The record of data such as the situation of change of solar thermal collector outlet temperature, heat collector outlet temperature and cistern water level during with normal operation compares, and when finding significant change, then confirms to have occurred the bombing seepy question; Do not need measurement device separately, only just can judge that according to the signal of solar water heating system controller collection the heat collector bombing leaks.
Description of drawings
Fig. 1 is the solar water heating system sketch map of temperature difference endless form operation;
Fig. 2 is the solar water heating system sketch map of constant temperature water-out manners operation;
Fig. 3 is solar water heating system heat collector outlet temperature and a water pump state diagram under the normal condition;
Fig. 4 is solar water heating system heat collector outlet temperature and water pump state diagram when bombing occurring.
Among the figure: 1. solar thermal collector, 2. water tank, 3. heat collector circuit cycle water pump is 4. gone up water solenoid valve; 5. pipeline, 6-1,6-2,6-3. temperature sensor, 7. running water water supply pipeline; 8. water pipeline, 9. level sensor is 10. used water solenoid valve; T1, T2, T3. be the detected temperatures of representation temperature sensor 6-1,6-2,6-3 respectively, 11. heat collector outlet temperature curves, 12. water pump condition curves.
The specific embodiment
The solar water heating system bombing of the present invention automatic judging method that leaks, its preferable specific embodiment comprises step:
A, when the solar water heating system installation normally moves, when heat collector temperature difference circulation or constant temperature water outlet start, the variation of writing down following parameter:
Heat collector outlet temperature, cistern water level, water temperature arrive the time of peak temperature, the amplitude that temperature raises, the time of cooling, the time of circulation;
B, the water circulating pump of each solar thermal collector or on water solenoid valve when starting, gather the solar thermal collector outlet temperature, and the situation of change of record heat collector outlet temperature and cistern water level;
Record in C, data that step B is obtained and the steps A during normal operation compares, and when the discovery significant change, then confirms to have occurred the bombing seepy question;
D, above-mentioned steps is compiled into software is installed in the solar energy system controller, when being judged as bombing when leaking, controller stops water circulating pump automatically or goes up water solenoid valve.
Significant change among the said step C comprise following each or multinomial:
Changing Pattern obviously with steps A in record be not inconsistent, do not have the appearance temperature peak value, time of reaching temperature peak obviously extends, occur during the temperature difference circular flow water level descend, when constant temperature goes out water running water level rising or rise time obviously do not extend.
Carry out detailed description in the face of the present invention down:
The solar water heating system controller is in order to realize the control to hot-water heating system; Need to gather heat collector head temperature (or outlet temperature) T1 and cistern water level; The controller unlatching that will control water pump or magnetic valve stops in addition, then has switching signal to export to water pump or magnetic valve.All these parameter values maybe can be through getting with the controller communication all in controller, like the equipment with the controller communication such as the computer of remote monitoring, solar water heating system data center.
When temperature difference circulation or constant temperature water outlet satisfied condition, controller can start water circulating pump or go up water solenoid valve, throws water in the water tank or running water into heat collector; Hot water in the heat collector is ejected, and at this moment, the temperature of heat collector top (outlet) will change; Its Changing Pattern such as Fig. 3: when water pump or magnetic valve startup, because the hot water in the heat collector is ejected, heat collector outlet temperature T1 begins to rise; After rising to maximum temperature, because the injection of cold water, temperature begins again to descend; When dropping to the condition of discontented sufficient temperature difference circulation or constant temperature water outlet, the out of service or upward water solenoid valve shutoff of water circulating pump.Wherein, being opened to the time that the heat collector outlet temperature is raised to peak from starting mode of pump or magnetic valve is t1, and the time that starting mode of pump or magnetic valve are opened is t2; Wherein the flow of the temperature level of the length of time t1 and heat collector outlet and heat collector water outlet is relevant; Because always constant (the configuring) of temperature conditions that water pump operation or magnetic valve start, in a short time, the flow of heat collector water outlet is substantially constant also; Therefore to same system, t1 is constant basically.
During starting mode of pump or magnetic valve unlatching, for temperature difference endless form, when the user did not open with water solenoid valve and last water solenoid valve, water level was constant; For the constant temperature water-out manners, when having user's water magnetic valve not open, water level will rise with a constant rate of speed gradually.Below all be the situation of system when operate as normal.The speed size that water level rises, also relevant with the flow of heat collector water outlet.And under the normal condition, the rate of output water of heat collector is constant basically.
When the bombing drainage occurring, the heat collector water flow will inevitably reduce, if it is serious to leak; Flow even be reduced to zero; At this moment, the temperature changing regularity of heat collector outlet is bound to change, if peak value does not appear in the heat collector outlet temperature; Being that temperature is not past rises, and then explanation has more serious seepy question.If peak value, and the time t1 that occurs prolongs greatly, also can be judged as bombing to occur and leak, but not be very serious, because the heat collector outlet also has flow, just variation has taken place flow.Whether when judging above situation, can also judge through water level simultaneously: at first detect this moment user and open with water solenoid valve, when not opening, for temperature difference endless form, water level is if descend, and then certain have bombing and a large amount of drainages; For the constant temperature water-out manners, if rising does not appear in water level, perhaps climbing speed obviously descends, and then must be bombing and a large amount of drainages to have occurred.
Employing is with said method; Other sensors or equipment can be installed separately; Temperature, water level and the water pump of only gathering with controller or the on off state of magnetic valve just can judge whether to occur blasted pipe phenomenon, can with this determination methods be compiled into software be installed in controller or with equipment such as the computer of controller communication or data center in; With regard to the warning that can realize the bombing of solar water heating system is leaked; Controller can remove to stop water pump operation or cut out magnetic valve through this alarm condition simultaneously, avoids more water to flow out, and results in greater loss.
Along with the operation of system, the changes in flow rate that causes because of regular elements such as incrustation scale, pump power variations is slowly, but also can cause t1, t2 and SEA LEVEL VARIATION.In the solar energy system controller, can often change little t1 according to collecting, t2 and rate of rise come the standard value of former storage is revised, and like this, have just got rid of the interference of factors such as incrustation scale to judging.
Adopt this method, do not need to install separately other sensor devices, also avoided the influence of high temperature and incrustation scale, only need update software, just realized bombing water leakage alarm solar water heating system to judging.
Specific embodiment 1:
A solar water heating system adopts temperature difference endless form.
As shown in Figure 3 during normal the operation, during 9:02:38, starting mode of pump begins temperature difference circulation; The heat collector outlet temperature is since 57 ℃ of risings, and during to 9:09:08, temperature peaks 66 ℃; After this heat collector outlet temperature begins to descend; During to 9:28:08, water pump is out of service, and this moment, the heat collector outlet temperature was 54 ℃.The time t1 that can calculate the temperature peak appearance is 7.5 minutes.
As shown in Figure 4, for the situation that bombing is leaked appears in this solar water heating system, because water leakage is not very big; Therefore behind the starting mode of pump, water temperature still can rise, and the starting mode of pump time is 14:44:55; And temperature reaches the time at top is 15:00:54, and the time t1 that reaches the top is 16 minutes, is far longer than about 7.5 minutes under the normal condition; And water level begins start-up time to water pump time 15:52:55 out of service from water pump, lasts 1 hour 8 minutes, water volume in water tank from 78% dropped to 55%; Therefore, can judge that the bombing drainage has necessarily appearred in solar water heating system according to this point.If just change at preceding about 20 minutes controllers and to judge that bombing occurring leaks, and stop water pump operation, so just avoided reaching 1 hour leak according to time to peak and the water yield.
Specific embodiment 2:
A solar water heating system adopts the constant temperature water-out manners, and when magnetic valve was opened, the time t1 that peak value appears in the heat collector outlet temperature was 3 minutes, and cistern water level rises with the speed of 70～76mm/min simultaneously.When bombing occurring and leak, the time t1 that peak value appears in the heat collector outlet temperature has reached 10 minutes, and the speed that cistern water level rises is merely 22mm/min, therefore, can judge solar water heating system and the bombing drainage occur.
Specific embodiment 3:
For the solar water heating system of a plurality of closed circuits of a plurality of collector arrays, usually adopt be water tank less than the time constant temperature water outlet method of operation, tank water changes temperature difference endless form into when full, use when being lower than 50% when the water yield, changes the constant temperature water outlet method of operation again into.Need be according to every collector array outlet temperature and water pump, magnetic valve state separately; Carry out normal value record and relatively respectively, then according to being which any method of operation (still constant temperature water outlet of temperature difference circulation) judged and organized collector array and bombing occurred and leak at present.
The above; Be merely the preferable specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (2)
1. solar water heating system bombing automatic judging method that leaks is characterized in that, comprises step:
A, when the solar water heating system installation normally moves, when heat collector temperature difference circulation or constant temperature water outlet start, the variation of writing down following parameter:
Heat collector outlet temperature, cistern water level, water temperature arrive the time of peak temperature, the amplitude that temperature raises, the time of cooling, the time of circulation;
B, the water circulating pump of each solar thermal collector or on water solenoid valve when starting, gather the solar thermal collector outlet temperature, and the situation of change of record heat collector outlet temperature and cistern water level;
Record in C, data that step B is obtained and the steps A during normal operation compares, and when the discovery significant change, then confirms to have occurred the bombing seepy question;
D, above-mentioned steps is compiled into software is installed in the solar energy system controller, when being judged as bombing when leaking, controller stops water circulating pump automatically or goes up water solenoid valve.
2. the solar water heating system bombing according to claim 1 automatic judging method that leaks is characterized in that, the significant change among the said step C comprise following each or multinomial:
Changing Pattern obviously with steps A in record be not inconsistent, do not have the appearance temperature peak value, time of reaching temperature peak obviously extends, occur during the temperature difference circular flow water level descend, when constant temperature goes out water running water level rising or rise time obviously do not extend.
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| CN2012101876771A CN102734941A (en) | 2012-06-07 | 2012-06-07 | Automatic judgement method for pipe explosion and water leakage of solar water heating system |
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| CN2012101876771A CN102734941A (en) | 2012-06-07 | 2012-06-07 | Automatic judgement method for pipe explosion and water leakage of solar water heating system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980304A (en) * | 2012-11-27 | 2013-03-20 | 王波兰 | Leakage detection method for water heater |
| CN102997444A (en) * | 2012-11-27 | 2013-03-27 | 王波兰 | Water heater |
| CN107831797A (en) * | 2017-11-20 | 2018-03-23 | 中机国际工程设计研究院有限责任公司 | Factory building safety and environmental protection industrial pond |
| CN114252213A (en) * | 2021-12-22 | 2022-03-29 | 北京金茂人居环境科技有限公司 | Heating and ventilation circulating pipeline water leakage monitoring system and control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201434529Y (en) * | 2009-05-22 | 2010-03-31 | 东南大学 | Intelligent control alarm for water feeding pipe of solar water heater |
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2012
- 2012-06-07 CN CN2012101876771A patent/CN102734941A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201434529Y (en) * | 2009-05-22 | 2010-03-31 | 东南大学 | Intelligent control alarm for water feeding pipe of solar water heater |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980304A (en) * | 2012-11-27 | 2013-03-20 | 王波兰 | Leakage detection method for water heater |
| CN102997444A (en) * | 2012-11-27 | 2013-03-27 | 王波兰 | Water heater |
| CN102980304B (en) * | 2012-11-27 | 2016-05-04 | 余姚市泗门印刷厂 | A kind of water heater detection method of leaking |
| CN107831797A (en) * | 2017-11-20 | 2018-03-23 | 中机国际工程设计研究院有限责任公司 | Factory building safety and environmental protection industrial pond |
| CN114252213A (en) * | 2021-12-22 | 2022-03-29 | 北京金茂人居环境科技有限公司 | Heating and ventilation circulating pipeline water leakage monitoring system and control method |
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Application publication date: 20121017 |