CN106839467B - A kind of control method for the double water tank solar water heating system changing lowest water level - Google Patents
A kind of control method for the double water tank solar water heating system changing lowest water level Download PDFInfo
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- CN106839467B CN106839467B CN201710035713.5A CN201710035713A CN106839467B CN 106839467 B CN106839467 B CN 106839467B CN 201710035713 A CN201710035713 A CN 201710035713A CN 106839467 B CN106839467 B CN 106839467B
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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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- 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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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
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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
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Abstract
The invention discloses a kind of control methods of double water tank solar water heating system for changing lowest water level, the following steps are included: to the multiple parameters of the double water tank solar water heating system of daily day part are acquired in n days before prediction day, with the water consumption that n days a few days ago daily day parts of prediction are calculated in water flow-water flow of the return water main pipe in the corresponding period of the daily day part of prediction n days a few days ago for water conduit tube, the statistical method that t is distributed in connected applications mathematical statistics, under the confidence level of setting, following formula is respectively adopted, prediction day day part water demands forecasting value is calculated, calculate the heat supply water tank water level settings value of prediction day gradient temperature control, collect thermal cycle, heat collection water tank is to heat supply water tank moisturizing, heat collection water tank moisturizing, heat collection water tank is to heat supply water tank moisturizing, gradient temperature control moisturizing and overheating protection, using The method reduces The opening time of auxiliary thermal source, it is contemplated that more energy saving by 20% or more than single water tanks solar energy hot-water heating system.
Description
Technical field
The present invention relates to the control methods of double water tank solar water heating system, and the invention particularly relates to variation lowest water levels
The control method of double water tank solar water heating system.
Background technique
Currently, country greatly develops the utilization of renewable energy, solar water heating system is one of Solar use
Most common mode.But solar radiation quantity is with season, day-night change, while also by the strong shadow of the enchancement factors such as Changes in weather
It rings, there is very big unstability, simultaneously because the difference of user's water habits, causes day part water consumption difference very big, be
This solar water heating system has been equipped with auxiliary thermal source, and auxiliary thermal source energy consumption also becomes the main energy of solar water heating system
Consumption, how in the case where meeting user's water demand, the opening time for reducing auxiliary thermal source to the greatest extent is to reduce solar water
The Main way of system energy consumption.
Conventional centralized solar water heating system such as Fig. 1, system mainly include solar thermal collector, auxiliary thermal source, storage
Boiler and control system, it is heat storage water tank supplement that basic operation logic, which passes through water pipe 7 at night first as shown in Figure 1:,
Quantitative water, wherein the volume of heat storage water tank is according to specification " solar water heating system design, installation and engineering acceptance of work skill
Art specification " it chooses, secondly, when using temperature difference domination set thermal cycle, when 9 upper temp of heat collector and the temperature of heat storage water tank 1 are big
When setting value (such as 5 DEG C), collection hot recycle pump 8 is opened, and system carries out collection thermal cycle, before being started to use water with water terminal user 10
(such as 1h) for a period of time, judges whether the water temperature in solar heat storage water tank 1 meets setting value (such as 60 DEG C), such as not up to, opens
Circulating-heating pump 2 is opened, is heated using the circulation of auxiliary thermal source 3, reaches water temperature setting value (60 DEG C), hot water passes through equipped with confession
The water supplying pipe 5 of water pump 4 supplies terminal user 10, and user's return water returns to heat storage water tank 1 by return pipe 6.
This system operation logic is simple, easy to control, but is usually the requirement for guaranteeing the relatively high water usage amount in summer, water tank
The lowest water level of interior setting is significantly larger than actual hourly consumption, and the setting value of parameter is definite value, can not with season and
User's water habits and change, the setting of parameter lacks scientific and accuracy, and system lowest water level is influence system auxiliary
The principal element of heat source heating time directly affects the energy consumption of system, because season, weather and water consumption etc. it is uncertain because
Element causes quantity of water in water tank more much larger than actual used water amount at most moment, for the water temperature for guaranteeing a large amount of hot water in water tank,
Cause the auxiliary heating source for heating time to obviously increase, increases system energy consumption.
Summary of the invention
The purpose of the present invention is to overcome the disadvantages of the prior art, and providing a kind of can preferably adapt to season and weather and use
The variation of the enchancement factors such as water, the consumption for reducing auxiliary thermal source improve solar energy utilization ratio and realize energy-efficient maximized
Change the control method of the double water tank solar water heating system of lowest water level.
A kind of control method for the double water tank solar water heating system changing lowest water level, comprising the following steps:
Step 1: to prediction day before in n days the double water tank solar water heating system of daily day part multiple parameters into
Row acquisition, process are as follows:
On heat supply water tank sum aggregate boiler upload formula water-level gauge and thermometer are installed respectively, are respectively used to detection supplying hot water
The real-time water temperature in real time water level, heat supply water tank in case, the real time water level in heat collection water tank, the Real-time Water in heat collection water tank
Temperature；On system water supply main pipe between the water inlet for being connected to user and the water outlet of heat supply water tank and be connected to user go out
Flowmeter is installed respectively on system return main pipe between the mouth of a river and the water return outlet of heat supply water tank, for detecting for water conduit tube pre-
The water flow in the corresponding period of water flow and system return main pipe of surveying n days a few days ago daily day parts, heat collector into
Upload formula thermometer is installed in outlet respectively, is respectively used to the real-time water temperature and heat collector input end of detection heat collector outlet end
Real-time water temperature.
Step 2: predicting water flow-return water main pipe of n days a few days ago daily day parts in the corresponding period with for water conduit tube
Water flow be calculated prediction n days a few days ago daily day parts water consumption；
Step 3: the statistical method that t is distributed in connected applications mathematical statistics is respectively adopted down under the confidence level of setting
Prediction day day part water demands forecasting value is calculated in formula；
μ in formulaiRepresentative sample mean value；
QijRepresent the water consumption of n days a few days ago daily day parts of prediction；
SiRepresentative sample standard deviation；
tp(n-1) coefficient value when representing confidence level as p；
QiRepresent prediction day day part water demands forecasting value；
N is the sampling number of days set before predicting day；
I represents the daily day part serial number of setting；
Step 4: calculating prediction day heat supply water sum aggregate boiler day part lowest water level value, formula is as follows:
H in formula1iHeat supply water tank is represented in prediction day day part lowest water level required value；
h2iHeat collection water tank is represented in prediction day day part lowest water level required value；
S is heat supply water tank sum aggregate boiler floor space；
h0For the lowest safe waterline of heat supply water tank sum aggregate boiler；
Step 5: calculating the heat supply water tank water level settings value of prediction day gradient temperature control, calculating process is as follows:
In formula: hsRepresent the heat supply water tank water level settings value of prediction day gradient temperature control；
At the beginning of a is peak demand rate, b is the end time of peak demand rate；
Step 6: collection thermal cycle, detailed process are as follows: work as real time temperature-heat collection water tank of heat collector outlet end in prediction day
Interior real time temperature >=the first setting value, open thermal-arrest water circulating pump so that in heat collection water tank water outflow heat collection water tank and according to
Secondary flow through returns to heat collection water tank after thermal-arrest water circulating pump and solar thermal collector and carries out collection thermal cycle, when the reality of heat collector outlet end
Real time temperature≤second setting value in Shi Wendu-heat collection water tank closes collection hot recycle pump；
Step 7: the real time water level before the day part of prediction day in the first setting time detection heat supply water tank, works as heat supply
Real time water level < heat supply water tank in water tank is opened and is connected by water supply line when predicting day day part lowest water level required value
The hot water of arbitrary temp in heat collection water tank is sent into heat supply water tank to confession by the small pump between heat collection water tank and heat supply water tank
Real time water level=heat supply water tank in boiler closes small pump, small pump in the lowest water level required value of prediction day day part
Heat supply water tank water temperature is detected after closing, when heat supply water tank temperature < system heat supply coolant-temperature gage, opens circulating-heating pump for heat supply
Water in water tank is extracted out and returns again to heat supply water tank after auxiliary heating source for heating up to real-time water temperature=heat supply in heat supply water tank
Stop heating when cistern water supply desired temperature；When heat supply water tank temperature >=heat supply water tank supply water temperature setting value, it is not turned on auxiliary
Help heat source；
Step 8: prediction day day part be later than the first setting time the second setting time or small pump it is out of service
When detection heat collection water tank in real time water level, if real time water level < heat collection water tank in heat collection water tank is minimum in prediction day day part
When water level required value, opening electronic water compensating valve makes moisturizing flow into heat collection water tank progress moisturizing until heat collection water tank through electronic water compensating valve
Interior real time water level is equal to heat collection water tank when predicting day day part lowest water level required value, closes electronic water compensating valve, then sharp
Collection thermal cycle is carried out to the water in heat storage water tank with solar energy heating circulation；If real time water level >=heat collection water tank in heat collection water tank
In prediction day day part lowest water level required value, then collection thermal cycle directly is carried out to the water in heat collection water tank；
Step 9: heat collection water tank is to heat supply water tank moisturizing, detailed process are as follows: at any time when heat collection water tank water temperature=collection
When boiler is to heat supply water tank moisturizing desired temperature, small pump is opened, the water in heat collection water tank is sent into heat supply water tank to collecting
When water level minimizes safety level in boiler, small pump is closed, electronic water compensating valve is then turned on and heat collection water tank is mended
Water is further continued for carrying out collection thermal cycle；
Step 10: gradient temperature control moisturizing, detailed process are as follows: at any time when the real time water level in heat supply water tank reaches pre-
When surveying the heat supply water tank water level settings value of day gradient temperature control, heat collection water tank is improved to heat supply water tank moisturizing desired temperature, then
Repetition step 6-step 9 closes small pump until when the water level of heat supply water tank reaches heat supply water tank highest safety level, after
It is continuous to carry out collection thermal cycle, hereafter when real-time water temperature >=heat collection water tank in heat collection water tank is to the water temperature setting value of heat supply water tank moisturizing
When, it opens and closes electricity when electronic water compensating valve reaches heat collection water tank highest safety level to heat collection water tank moisturizing to heat collection water tank water level
Dynamic water compensating valve is closed collection thermal cycle, was started if water continues the limiting temperature that heating is equal to heat collector damage in heat collection water tank
Thermal cycle protected mode, prevents system failure.
Compared with prior art, the present invention the beneficial effects of the present invention are:
(1) heat collection water tank temperature can be effectively reduced in the way of double water tank, improves collecting efficiency, and double water tank will collect
Boiler and heat supply water tank separate, and propose the stability of high water usage, while can preferably couple with auxiliary thermal source, and for can be with
By load dispersed placement, facilitate building bearing, while using water using what double water tank can store i period and i+1 period respectively
Amount guarantees that heat supply water tank water temperature is not influenced by moisturizing.
(2) guarantee to meet lowest water level h in i moment heat supply water tank1i, heat collection water tank meets lowest water level h2i, system is made to exist
Run under minimum amount, have adjusted because round the clock, water consumption variation etc. factors influence, reduce the opening time of auxiliary thermal source.
(3) the gradient temperature control water level settings value h in heat supply water tank is sets, when summer, solar radiation quantity was higher, Ke Yijin
Row gradient temperature control increases water temperature setting value t of the heat collection water tank to heat supply water tank moisturizingsSetting value both ensure that the requirement of water,
It utilizes solar energy to greatest extent again, improves water temperature.
(4) it when solar radiation is not strong, is equivalent to using collection thermal cycle and cold water is preheated, be then sent into supplying hot water
Case avoids directly heating from water at low temperature, is increased to heating efficiency using the water of auxiliary heating source for heating higher temperature.
(5) water is currently used using n days before forecast date (such as 14 days, the numerical value can proper transformation) day part water demands forecastings
Day corresponds to day part water consumption, analyzes in conjunction with the t mathematical statistics method being distributed each data of different moments, obtains energy
Meet the water consumption set in possible situation, predicted value is representative.When setting number of days 14 day data of selection, both has and fill
Point representativeness, and be avoided that there is hysteresis quality to water demands forecasting because access time is too long.
Detailed description of the invention
Fig. 1 is conventional centralized solar water heating system schematic diagram.
Fig. 2 is former using the system of the control method of the double water tank solar water heating system of variation lowest water level of the invention
Reason figure.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is described further to enable those of ordinary skill in the art
It can implement accordingly refering to after this specification.
In conjunction with Fig. 2, a kind of control method of the double water tank solar water heating system of variation lowest water level of the invention, including
Following steps:
Step 1: to prediction day before in n days the double water tank solar water heating system of daily day part multiple parameters into
Row acquisition, process are as follows:
On heat supply water tank 1 and heat collection water tank 9 upload formula water-level gauge and thermometer are installed respectively, are respectively used to detection heat supply
Real time water level h in water tank 11, real-time water temperature t in heat supply water tank1, real time water level h in heat collection water tank2, in heat collection water tank
Real-time water temperature t2；On system water supply main pipe 5 between the water outlet of the water inlet and heat supply water tank 1 that are connected to user 6 and even
It connects and flowmeter is installed respectively on the system return main pipe 7 between the water outlet of user 6 and the water return outlet of heat supply water tank, for examining
Survey the water flow Q for water conduit tube in the daily day part of prediction n days a few days agoijgAnd system return main pipe is in the water of corresponding period
Flow Qijh, in the inlet and outlet of heat collector 11 upload formula thermometer is installed respectively, is respectively used to the real-time of detection heat collector outlet end
Water temperature t3And the real-time water temperature t of heat collector input end4。
Step 2: with for water conduit tube prediction n days a few days ago daily day part water flow QijgReturn water main pipe is corresponding
The water flow Q of periodijhThe water consumption Q of n days a few days ago daily day parts of prediction is calculatedij。
Step 3: the statistical method that t is distributed in connected applications mathematical statistics calculates separately under the confidence level of setting
Day day part water demands forecasting value Q is predicted outi。
Detailed process is as follows:
μ in formulaiRepresentative sample mean value；
QijRepresent the water consumption of n days a few days ago daily day parts of prediction；
SiRepresentative sample standard deviation；
tp(n-1) coefficient value when representing confidence level as p, the p quartile table which is distributed by t check in, and confidence level is higher, then
QiCan be bigger, comprehensively considering recommendation to choose confidence level is 95%.
QiRepresent prediction day day part water demands forecasting value；
N is the sampling number of days set before predicting day；
I represents the daily day part serial number of setting；
Step 4: calculating prediction day heat supply water sum aggregate boiler day part lowest water level value, formula is as follows:
h2i=h1(i+1)-- formula 5
H in formula1iHeat supply water tank is represented in prediction day day part lowest water level required value；
h2iHeat collection water tank is represented in prediction day day part lowest water level required value；
S is heat supply water tank sum aggregate boiler floor space；
h0For the lowest safe waterline of heat supply water tank sum aggregate boiler；
Setting two water tank floor spaces in this step to simplify the calculation is S, heat collection water tank i period lowest water level required value etc.
In heat supply water tank i+1 period lowest water level required value, i.e. heat collection water tank lays in i+1 period water consumption；
Step 5: calculating the heat supply water tank water level settings value h of prediction day gradient temperature controls, calculating process is as follows:
H in formula0Represent the lowest safe waterline of heat supply water tank sum aggregate boiler；
hsRepresent the heat supply water tank water level settings value of prediction day gradient temperature control；
At the beginning of a is peak demand rate, b is the end time of peak demand rate, and the value is according to each water for building
Function is adjustable.
Step 6: collection thermal cycle, detailed process are as follows: work as the real time temperature t of heat collector outlet end in prediction day3Collect hot water
Real time temperature t in case2>=the first setting value opens thermal-arrest water circulating pump 10, so that the water outflow collection hot water in heat collection water tank
Case 9 simultaneously carries out collection thermal cycle followed by heat collection water tank is returned after thermal-arrest water circulating pump 10 and solar thermal collector 11, works as thermal-arrest
The real time temperature t of device outlet end3Real time temperature t in heat collection water tank2≤ the second setting value closes collection hot recycle pump 10.
Step 7: before the day part of prediction day in the first setting time (time can appropriate adjustment) detection heat supply water tank
Real time water level h1, as the real time water level h in heat supply water tank1< heat supply water tank is in prediction day day part lowest water level required value h1i
When, it opens and the small pump 8 between heat collection water tank 9 and heat supply water tank 1 is connected to by water supply line, it will be any in heat collection water tank
The hot water of temperature is sent into the real time water level h in heat supply water tank to heat supply water tank1=heat supply water tank is minimum prediction day day part
Water level required value h1i, small pump 8 is closed, small pump detects heat supply water tank water temperature t after closing1, as heat supply water tank temperature t1< system
Unite heat supply coolant-temperature gage tgWhen, circulating-heating pump 2 is opened by the water extraction in heat supply water tank and is returned again to after the heating of auxiliary thermal source 3
Heat supply water tank 1 is up to the real-time water temperature t in heat supply water tank1=heat supply water tank supply water temperature setting value tgWhen stop heating；Work as heat supply
Water tank temperature t1>=heat supply water tank supply water temperature setting value tg, it is not turned on auxiliary thermal source.
Step 8: the day part in prediction day is later than the second setting time of the first setting time, (time can suitably be adjusted
It is whole) or small pump 8 it is out of service when detection heat collection water tank in real time water level h2If the real time water level h in heat collection water tank2< collection
Boiler is in prediction day day part lowest water level required value h2iWhen, opening electronic water compensating valve 12 flows moisturizing through electronic water compensating valve 12
Enter heat collection water tank and carries out moisturizing up to the real time water level h in heat collection water tank2Equal to heat collection water tank in the prediction minimum water of day day part
Position required value h2iWhen, electronic water compensating valve 12 is closed, is then recycled using solar energy heating and thermal-arrest is carried out to the water in heat storage water tank
Circulation；If the real time water level h in heat collection water tank2>=heat collection water tank is in prediction day day part lowest water level required value h2i, then directly
Collection thermal cycle is carried out to the water in heat collection water tank；
Step 9: heat collection water tank is to heat supply water tank moisturizing, detailed process are as follows: at any time as heat collection water tank water temperature t2=
Heat collection water tank is to heat supply water tank moisturizing desired temperature tsWhen (two gradients of setting), small pump 8 is opened, it will be in heat collection water tank
Water is sent into water level in heat supply water tank to heat collection water tank and minimizes safety level h0When, small pump 8 is closed, electronic benefit is then turned on
Water valve 12 carries out moisturizing to heat collection water tank, is further continued for carrying out collection thermal cycle.
Step 10: gradient temperature control moisturizing, detailed process are as follows: at any time as the real time water level h in heat supply water tank1Reach
Predict the heat supply water tank water level settings value h of day gradient temperature controlsWhen, heat collection water tank is improved to heat supply water tank moisturizing desired temperature ts
(the second gradient), then repeatedly step 6-step 9 until work as heat supply water tank water level h1Reach heat supply water tank highest safe water
Position h1jWhen, small pump 8 is closed, continues to collect thermal cycle, hereafter as the real-time water temperature t in heat collection water tank2>=heat collection water tank to
The water temperature setting value t of heat supply water tank moisturizingsWhen (second temperature gradient), opens electronic water compensating valve 12 and extremely collect to heat collection water tank moisturizing
Hotwell level h2Reach heat collection water tank highest safety level h2jWhen close electronic water compensating valve 12, if water is after of continuing rising in heat collection water tank
Temperature is equal to the limiting temperature t of heat collector damage of componentsj, then close collection thermal cycle, starting overheat recycling-guard mode, prevent be
System damage.Overheat recycling-guard mode in this step can use the prior art, publish referring to Chinese renewable energy association
The documents disclosed in Huang Ming Sunpower, Inc. Liu Hong thread of " solar energy " 13 phases in 2013 " Split pressure-bearing type is too
The overheating protection of positive energy hot-water heating system ".
As a kind of system for realizing the method for the present invention, including heat collection water tank 9 and solar thermal collector 11, the thermal-arrest
The outlet end of water tank 9 by thermal-arrest circulation line be sequentially connected water circulating pump 10, solar thermal collector 1 and heat collection water tank 9 into
Mouth end, is equipped with electronic water compensating valve 12, the heat collection water tank 9 is by being equipped with small pump 8 on the heat collection water tank 9
Water supply line is connected with the water supplement port of heat supply water tank 1, the first water outlet of the heat supply water tank 1 by circulating-heating pipeline according to
The water return outlet of secondary connection circulating-heating pump 2, auxiliary thermal source 3 and heat supply water tank 1, the second water outlet of the heat supply water tank 1 are logical
It crosses the system water supply main pipe 5 equipped with hot water water supply pump 4 and flowmeter to be connected with the water inlet of user, the water outlet of the user
It is connected between the water return outlet of heat supply water tank by being equipped with the system return main pipe 7 of flowmeter, in 1 He of heat supply water tank
Be separately installed on heat collection water tank 9 the upload formula water-level gauge for detecting the real time water level in heat supply water tank 1 and heat collection water tank with
And the thermometer of the real-time water temperature in detection heat supply water tank sum aggregate boiler, it is installed respectively in the inlet and outlet of the heat collector 11
There is the upload formula thermometer of the real-time water temperature of the real-time water temperature and heat collector input end for detecting heat collector outlet end.
Embodiment 1
Project profile: solar energy centralization solar hot water system design daily water consumption 10t, 24 hours centralizedly supply hot water 60 of whole day
DEG C hot water, using 2.5m × 3m × 2m heat supply water tank, using 2.5m × 3m × 1m heat collection water tank, heat collector uses glass
Vacuum tube, 150 ㎡ of heat collector area, 39 ° of heat collector inclination angle, auxiliary thermal source use electric heating, heating power 120kW.
Step 1: to prediction day before in 14 days the double water tank solar water heating system of daily day part multiple parameters into
Row acquisition, process are as follows:
On heat supply water tank 1 and heat collection water tank 9 upload formula water-level gauge and thermometer are installed respectively, are respectively used to detection heat supply
Real time water level h in water tank 11, real-time water temperature t in heat supply water tank1, real time water level h in heat collection water tank2, in heat collection water tank
Real-time water temperature t2；On system water supply main pipe 5 between the water outlet of the water inlet and heat supply water tank 1 that are connected to user 6 and even
It connects and flowmeter is installed respectively on the system return main pipe 7 between the water outlet of user 6 and the water return outlet of heat supply water tank, for examining
Survey the water flow Q for water conduit tube in the daily day part of prediction 14 days a few days agoijgAnd system return main pipe is in the corresponding period
Water flow Qijh, in the inlet and outlet of heat collector 11 upload formula thermometer is installed respectively, is respectively used to the reality of detection heat collector outlet end
Shi Shuiwen t3And the real-time water temperature t of heat collector input end4。
Step 2: with for water conduit tube prediction 14 days a few days ago daily day part water flow QijgReturn water main pipe is corresponding
The water flow Q of periodijh14 days a few days ago daily day parts of prediction are calculated and (were divided into 24 periods, per hour conduct for one day
One period) water consumption Qij, obtain (24 × 14) a water usage data.
Step 3: the statistical method that t is distributed in connected applications mathematical statistics is counted respectively under 95% confidence level of setting
Calculation obtains prediction day i period water demands forecasting value Qi。
Detailed process is as follows:
μ in formulaiRepresentative sample mean value；
QijRepresent the water consumption of 14 days a few days ago daily day parts of prediction；
SiRepresentative sample standard deviation；
QiRepresent prediction i day, water demands forecasting period value；
I represents the daily period serial number of setting；The 0:00-1:00 period is represented when example i=1.
tp(n-1) coefficient value when representing confidence level as p, the p quartile table which is distributed by t check in, and choose p=0.95,
Check in tp(n-1)=1.77；
Step 4: calculating prediction day heat supply water sum aggregate boiler day part lowest water level value, formula is as follows:
h2i=h1(i+1)-- formula 5
H in formula1iHeat supply water tank is represented in prediction day day part lowest water level required value；
h2iHeat collection water tank is represented in prediction day day part lowest water level required value；
S is heat supply water tank sum aggregate boiler floor space, is 7.5 ㎡.
h0It is 0.1m for the lowest safe waterline of heat supply water tank sum aggregate boiler.
Step 5: calculating the heat supply water tank water level settings value h of prediction day gradient temperature controls, calculating process is as follows:
H in formula0The lowest safe waterline of heat supply water tank sum aggregate boiler is represented, is 0.1m.
hsRepresent the heat supply water tank water level settings value of prediction day gradient temperature control；For 1.5m.
S is heat supply water tank sum aggregate boiler floor space, is 7.5 ㎡.In view of general water consumption integrated distribution is 18:
00-23:00 chooses a=18, b=23；
Step 6: collection thermal cycle, detailed process are as follows: work as the real time temperature t of heat collector outlet end in prediction day3Collect hot water
Real time temperature t in case2>=5 DEG C, open thermal-arrest water circulating pump 10 so that in heat collection water tank water outflow heat collection water tank 9 and according to
Secondary flow through returns to heat collection water tank after thermal-arrest water circulating pump 10 and solar thermal collector 11 and carries out collection thermal cycle, when heat collector outlet end
Real time temperature t3Real time temperature t in heat collection water tank2≤ 2 DEG C, close collection hot recycle pump 10；
Step 7: the real time water level h before the day part of prediction day in 10 minutes detection heat supply water tanks1, when heat supply water tank
Interior real time water level h1< heat supply water tank is in prediction day day part lowest water level required value h1iWhen, it opens and is connected by water supply line
The hot water of arbitrary temp in heat collection water tank is sent into heat supply water tank by the small pump 8 between heat collection water tank 9 and heat supply water tank 1
Real time water level h in heat supply water tank1The lowest water level required value h of=heat supply water tank in prediction day day part1i, close small pump
8, small pump detects heat supply water tank water temperature t after closing1, as heat supply water tank temperature t1At 60 DEG C of <, opening circulating-heating pump 2 will be for
Water in boiler is extracted out and returns again to heat supply water tank 1 up to the real-time water temperature t in heat supply water tank after the heating of auxiliary thermal source 31
Stop heating at=60 DEG C；As heat supply water tank temperature t1>=60 DEG C, it is not turned on auxiliary thermal source.
Step 8: before the day part for predicting day 5 minutes or when small pump 8 out of service it is real-time in detection heat collection water tank
Water level h2If the real time water level h in heat collection water tank2< heat collection water tank is in prediction day day part lowest water level required value h2iWhen, it opens
Opening electronic water compensating valve 12 makes moisturizing flow into heat collection water tank progress moisturizing up to the Real-time Water in heat collection water tank through electronic water compensating valve 12
Position h2Equal to heat collection water tank in prediction day day part lowest water level required value h2iWhen, electronic water compensating valve 12 is closed, then using too
Sun can collect thermal cycle and carry out collection thermal cycle to the water in heat storage water tank；If the real time water level h in heat collection water tank2>=heat collection water tank exists
Predict day day part lowest water level required value h2i, then collection thermal cycle directly is carried out to the water in heat collection water tank；
Step 9: heat collection water tank is to heat supply water tank moisturizing, detailed process are as follows: at any time as heat collection water tank water temperature t2=
Heat collection water tank is to heat supply water tank moisturizing desired temperature tsAt 60 DEG C of first gradient, small pump 8 is opened, by the water in heat collection water tank
It is sent into water level in heat supply water tank to heat collection water tank and closes small pump 8 when being down to 0.1m, be then turned on electronic water compensating valve 12 to thermal-arrest
Water tank carries out moisturizing, is further continued for carrying out collection thermal cycle.
Step 10: gradient temperature control moisturizing, detailed process are as follows: at any time as the real time water level h in heat supply water tank1Reach
When 1.5m, heat collection water tank is improved to heat supply water tank moisturizing desired temperature tsIt is 65 DEG C of second temperature gradient, then repeatedly step
Six-step 9 are until work as the water level h of heat supply water tank1When reaching 1.8m, close small pump 8, continue collect thermal cycle, hereafter when
Real-time water temperature t in heat collection water tank2The water temperature setting value t of >=heat collection water tank to heat supply water tank moisturizings65 DEG C of second temperature gradient
When, electronic water compensating valve 12 is opened to heat collection water tank moisturizing to heat collection water tank water level h2Electronic water compensating valve 12 is closed when reaching 0.9m,
If water continues heating equal to 75 DEG C in heat collection water tank, collection thermal cycle, starting overheat recycling-guard mode, anti-locking system damage are closed
It is bad.
Reduce the opening time of auxiliary thermal source using the method for the present invention, it is contemplated that than single water tanks solar energy hot-water heating system saving
20% or more the energy, makes full use of solar energy, reduces the discharge of conventional energy resource.
Above in conjunction with figure, invention has been described, and but the invention is not limited in above-mentioned embodiment,
The above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are in the present invention
Enlightenment under, the optimization of many details without deviating from the spirit of the invention, can also made, these belong to of the invention
Within protection.
Claims (1)
1. a kind of control method for the double water tank solar water heating system for changing lowest water level, it is characterised in that including following step
It is rapid:
Step 1: to the multiple parameters of the double water tank solar water heating system of daily day part are adopted in n days before prediction day
Collection, process are as follows:
On heat supply water tank sum aggregate boiler upload formula water-level gauge and thermometer are installed respectively, are respectively used in detection heat supply water tank
Real time water level, the real-time water temperature in heat supply water tank, the real time water level in heat collection water tank, the real-time water temperature in heat collection water tank；?
It is connected on the system water supply main pipe between the water inlet of user and the water outlet of heat supply water tank and is connected to the water outlet of user
Flowmeter is installed respectively on system return main pipe between the water return outlet of heat supply water tank, for detecting for water conduit tube in prediction day
Water flow of the water flow and system return main pipe of first n days daily day parts in the corresponding period, in the inlet and outlet of heat collector
Respectively install upload formula thermometer, be respectively used to detection heat collector outlet end real-time water temperature and heat collector input end it is real-time
Water temperature；
Step 2: with for water conduit tube prediction n days a few days ago daily day part water flow-return water main pipe the corresponding period water
Flow rate calculation obtains predicting the water consumption of n days a few days ago daily day parts；
Step 3: following formula meter is respectively adopted under the confidence level of setting in the statistical method that t is distributed in connected applications mathematical statistics
Calculation obtains prediction day day part water demands forecasting value；
μ in formulaiRepresentative sample mean value；
QijRepresent the water consumption of n days a few days ago daily day parts of prediction；
SiRepresentative sample standard deviation；
tp(n-1) coefficient value when representing confidence level as p；
QiRepresent prediction day day part water demands forecasting value；
N is the sampling number of days set before predicting day；
I represents the daily day part serial number of setting；
Step 4: calculating prediction day heat supply water sum aggregate boiler day part lowest water level value, formula is as follows:
H in formula1iHeat supply water tank is represented in prediction day day part lowest water level required value；
h2iHeat collection water tank is represented in prediction day day part lowest water level required value；
S is heat supply water tank sum aggregate boiler floor space；
h0For the lowest safe waterline of heat supply water tank sum aggregate boiler；
Step 5: calculating the heat supply water tank water level settings value of prediction day gradient temperature control, calculating process is as follows:
In formula: hsRepresent the heat supply water tank water level settings value of prediction day gradient temperature control；
At the beginning of a is peak demand rate, b is the end time of peak demand rate；
Step 6: collection thermal cycle, detailed process are as follows: in real time temperature-heat collection water tank that prediction day works as heat collector outlet end
Real time temperature >=the first setting value opens thermal-arrest water circulating pump, so that the water in heat collection water tank flows out heat collection water tank and successively flows
Heat collection water tank is returned after thermal-arrest water circulating pump and solar thermal collector and carries out collection thermal cycle, when the real-time temperature of heat collector outlet end
Real time temperature≤second setting value in degree-heat collection water tank closes collection hot recycle pump；
Step 7: the real time water level before the day part of prediction day in the first setting time detection heat supply water tank, when heat supply water tank
Interior real time water level < heat supply water tank is opened when predicting day day part lowest water level required value and is connected to collection by water supply line
The hot water of arbitrary temp in heat collection water tank is sent into heat supply water tank to supplying hot water by the small pump between boiler and heat supply water tank
Real time water level=heat supply water tank in case closes small pump, small pump is closed in the lowest water level required value of prediction day day part
Heat supply water tank water temperature is detected afterwards, when heat supply water tank temperature < system heat supply coolant-temperature gage, opens circulating-heating pump for heat supply water tank
Interior water is extracted out and returns again to heat supply water tank after auxiliary heating source for heating up to real-time water temperature=heat supply water tank in heat supply water tank
Stop heating when supply water temperature setting value；When heat supply water tank temperature >=heat supply water tank supply water temperature setting value, it is not turned on auxiliary heat
Source；
Step 8: the inspection when predicting that the day part of day is later than the second setting time or small pump out of service of the first setting time
The real time water level in heat collection water tank is surveyed, if the real time water level < heat collection water tank in heat collection water tank is in prediction day day part lowest water level
When required value, opening electronic water compensating valve makes moisturizing flow into heat collection water tank progress moisturizing until in heat collection water tank through electronic water compensating valve
Real time water level is equal to heat collection water tank when predicting day day part lowest water level required value, closes electronic water compensating valve, then using too
Sun can collect thermal cycle and carry out collection thermal cycle to the water in heat collection water tank；If real time water level >=heat collection water tank in heat collection water tank is pre-
Day day part lowest water level required value is surveyed, then collection thermal cycle directly is carried out to the water in heat collection water tank；
Step 9: heat collection water tank is to heat supply water tank moisturizing, detailed process are as follows: at any time when heat collection water tank water temperature=collection hot water
When case is to heat supply water tank moisturizing desired temperature, small pump is opened, the water in heat collection water tank is sent into heat supply water tank to collecting hot water
When water level minimizes safety level in case, small pump is closed, electronic water compensating valve is then turned on and moisturizing is carried out to heat collection water tank, then
Continue to collect thermal cycle；
Step 10: gradient temperature control moisturizing, detailed process are as follows: at any time when the real time water level in heat supply water tank reaches prediction day
When the heat supply water tank water level settings value of gradient temperature control, heat collection water tank is improved to heat supply water tank moisturizing desired temperature, is then repeated
Step 6-step 9 closes small pump until when the water level of heat supply water tank reaches heat supply water tank highest safety level, continue into
Row collection thermal cycle, hereafter when water temperature setting value of the real-time water temperature >=heat collection water tank in heat collection water tank to heat supply water tank moisturizing,
Open closed when electronic water compensating valve reaches heat collection water tank highest safety level to heat collection water tank moisturizing to heat collection water tank water level it is electronic
Water compensating valve closes collection thermal cycle, starting overheat if water continues the limiting temperature that heating is equal to heat collector damage in heat collection water tank
Recycling-guard mode, prevents system failure.
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| CN114165834B (en) * | 2021-11-30 | 2023-01-13 | 青岛海信日立空调系统有限公司 | Heat pump hot water system |
| CN114353352B (en) * | 2022-03-16 | 2023-04-14 | 迈伯特(江苏)电气技术有限公司 | Solar heating system based on standby heat energy storage |
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| JPS59131855A (en) * | 1983-01-18 | 1984-07-28 | Hiroaki Oda | Control method of hot water heated by solar heat having hot water tank open to atmosphere |
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| DE2540143A1 (en) * | 1975-09-09 | 1977-03-10 | Herbert Ing Grad Kirn | Control system for heating storage installation - has value of heat stored matched to predetermined value according to time of year |
| WO1995027874A1 (en) * | 1994-04-08 | 1995-10-19 | Sola Kleen Pty. Ltd. | Solar hot water heating system |
| CN101846407A (en) * | 2009-03-27 | 2010-09-29 | 王丹琳 | Time-interval control method of mixed-energy hot water system |
| CN102865621A (en) * | 2012-10-12 | 2013-01-09 | 陕西华夏新能源科技有限公司 | System and method for solar energy centralized hot water supply for high-rise residence |
| CN203518263U (en) * | 2013-07-16 | 2014-04-02 | 童葆华 | Solar water heating system for supplying heat in centralized mode and supplying water in time sharing mode |
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