CN110378076A - A kind of groove type solar heat collecting field temperature deviation quantitative evaluating method - Google Patents
A kind of groove type solar heat collecting field temperature deviation quantitative evaluating method Download PDFInfo
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Abstract
The invention discloses a kind of groove type solar heat collecting field temperature deviation quantitative evaluating methods, it include: the heat collection unit thermal balance model for establishing groove type solar heat collecting field, input the basic parameter of slot type solar energy heat-collection field, assuming that the heat-transfer fluid mean temperature of each thermal-arrest loop, calculate the flow for obtaining heat-transfer fluid in each thermal-arrest tubing loop, in conjunction with heat collection unit thermal balance model, that is, thermal balance relationship, calculate the outlet temperature and mean temperature of heat-transfer fluid in each thermal-arrest tubing loop, judge to calculate the heat-transfer fluid mean temperature of resulting each thermal-arrest loop and the absolute deviation of assumption value whether in 0.5 DEG C, if, then terminate operation, obtain the outlet temperature of thermal-arrest tubing loop, and carry out the comparison of outlet temperature deviation；If it is not, then assuming the heat-transfer fluid mean temperature of each thermal-arrest loop, loop iteration again.The present invention realizes the outlet temperature and its deviation for accurately calculating thermal-arrest tubing loop.
Description
Technical field
The present invention relates to field of new energy technologies, suitable for heat collecting field is quantitatively evaluated groove type solar collecting system
Temperature deviation groove type solar heat collecting field temperature deviation quantitative evaluating method.
Background technique
The energy is the basis of development of modern society economy, and the distinctive endowment of resources in China determines that coal fired power generation will exist for a long time
It occupies an leading position in energy system.On the one hand, with the promotion of the size of population and quality of the life, the consumption of traditional energy and day
It is all to increase；On the other hand, fire coal is the most important emission source of China's atmosphere pollution.In order to solve this problem, the world is multinational will
Schedule has been put in the development and utilization of renewable energy.Solar energy be it is a kind of cleaning, cheap, sustainable supply renewable energy.
Photovoltaic and photo-thermal are the principal modes of solar power generation.For photovoltaic, more efficient, the stability of solar light-heat power-generation
It is stronger.Groove type solar solar-thermal generating system is the current highest technology of concentrating solar power field commercialization degree.
Groove type solar heat collecting field is connected and is formed in parallel by a series of heat collection units, belongs to the middle Low Temperature Thermal benefit of solar energy
Use scope.Each heat collection unit is connected in series by several heat collectors, each heat collector is again by parabolic shape reflecting mirror, heat absorption
The multi-sections such as pipe, bracket point are constituted, and have heat-transfer fluid to flow through in absorbing pipe.When solar energy incidence is after groove type paraboloid aperture
Realize that luminous energy to the conversion of thermal energy, makes heat transferring medium reach certain temperature by processes such as focusing, reflection and absorptions, to meet not
With the heat collector of the demand of load.
Solar energy has intermittent and unstability, and normal direction direct sunlight irradiation level, shading coefficient and the sun are incident
Angle is affected with weather at any time.Therefore, in order to guarantee constant heat collecting field thermal output, it usually needs adjust turning for pump
Speed, and then the flow velocity of heat collecting field heat-transfer fluid is adjusted, to realize to the constant of heat collecting field outlet temperature.However, groove type solar
Heat collecting field has several columns composition.If keeping the pressure head of first row constant, with the increase of columns, got over a distance from first row thermal-collecting tube
Far, the pressure head of thermal-collecting tube column is smaller, and then leads to the reduction of its velocity in pipes, and outlet temperature rise is got higher.Eventually lead to slot type thermal-arrest
Between pipe column, the flow velocitys of each column, outlet temperature it is non-constant.
Summary of the invention
Goal of the invention: between the column of slot type thermal-collecting tube in the prior art, the flow velocitys of each column, outlet temperature it is non-constant,
The invention patent devise it is a kind of assessment slot type heat collecting field pipe column between outlet temperature deviation calculation method.
Technical solution: to realize the above-mentioned technical purpose, present invention employs following technical solutions:
A kind of groove type solar heat collecting field temperature deviation quantitative evaluating method, which comprises the following steps:
Step A: establishing the heat collection unit thermal balance model of groove type solar heat collecting field, input slot type solar energy heat-collection field
Basic parameter, the design parameter of each each component of heat collection unit, heat collecting field in physical parameter, thermal-arrest loop including heat-transfer fluid
Total flowWith the design parameter of heat collecting field；
Step B: assuming that the heat-transfer fluid mean temperature of each thermal-arrest loop；
Step C: according to heat collecting field total flow in step AWith the mean temperature in the design parameter and step B of heat collecting field
Value calculates the flow for obtaining heat-transfer fluid in each thermal-arrest tubing loop；
Step D: according to the numerical information of the temperature of the heat-transfer fluid in step B and step C and flow, in conjunction with heat collection unit
Thermal balance model, that is, thermal balance relationship calculates the outlet temperature and mean temperature of heat-transfer fluid in each thermal-arrest tubing loop；
Step E: what the heat-transfer fluid mean temperature and step B that resulting each thermal-arrest loop is calculated in judgment step D were assumed
The heat-transfer fluid mean temperature absolute deviation of each thermal-arrest loop, if so, terminating operation, obtains thermal-collecting tube whether in 0.5 DEG C
The outlet temperature of loop, and carry out the comparison of outlet temperature deviation；If it is not, then return step B, assumes each thermal-arrest loop again
Heat-transfer fluid mean temperature, circulate operation step B to step E.
Preferably, the step C obtains the calculation method of the flow of heat-transfer fluid in each thermal-arrest tubing loop, comprising:
Step C1: assuming that the flow of first thermal-arrest tubing loop isAcquisition the 2nd to the is calculated separately using iterative method
The flow of n thermal-arrest tubing loop
Step C2: judgementD is entered step if meeting condition, otherwise return step C1, it is again false
If the flow of the 1st thermal-arrest tubing loopCirculate operation step C1 to step C2.
Preferably, the heat collecting field includes heat exchanger, cold main pipe, hot main pipe, pump and 4n thermal-arrest tubing loop, heat exchange
Device, pump are arranged in the center of heat collecting field, and thermal-arrest tubing loop is symmetrically arranged in the two sides of heat exchanger, pump, each thermal-arrest tubing loop by
Several heat collection units are connected in series, and each thermal-arrest tubing loop is connected by cold main pipe with hot main pipe, and cold heat exchanging fluid flows out cold main pipe,
And entering each thermal-arrest tubing loop, heat exchanging fluid enters hot main pipe after each thermal-arrest tubing loop absorbs solar energy, in heat collecting field
It is circulated between thermal-arrest tubing loop.
Preferably, the step C1, further includes:
Sub-step C11: assuming that the flow of the 1st thermal-arrest tubing loopIteration initial value takes
Sub-step C12: to ipsilateral cold main pipe, hot main pipe and thermal-collecting tube loop is located at, cold main pipe and hot main pipe are distinguished
It is divided into n part, each thermal-arrest tubing loop respectively corresponds one section of cold main pipe and one section of hot main pipe, wherein the separation of cold main pipe
For the intersection point of n thermal-arrest tubing loop and cold main pipe, it is westwards denoted as 1c point, 2c point ... nc point, east respectively from the point close to heat exchanger
The split point of the cold main pipe of west side heat collecting field is denoted as 0c；The separation of hot main pipe is the intersection point of n thermal-arrest tubing loop and hot main pipe, from
Point close to heat exchanger is westwards denoted as 1h point, 2h point ... nh point respectively, and the point of the hot main pipe of thing side heat collecting field is denoted as 0h, first
First calculate the frictional resistant coefficient (λ of the 1st thermal-arrest tubing loop, the cold main pipe of paragraph 1 and the hot main pipe of paragraph 1loop,1, λ1c, λ1h) and
Coefficient of partial resistance (ξ1, ξ2, ξ1c, ξ1h), and then calculate first thermal-arrest tubing loop, the cold main pipe of paragraph 1 and the hot main pipe of paragraph 1
Gross head loses (Hloop,1, H1c, H1h), to calculate the flow velocity v of heat-transfer fluid in the 1st thermal-arrest tubing looploop,1；
Sub-step C13: assuming that the flow of the 2nd thermal-arrest tubing loopAnd obtain heat-transfer fluid in the thermal-arrest tubing loop
Flow；The gross head loss of the 2nd thermal-arrest tubing loop, the 2nd section of cold main pipe and the 2nd section of hot main pipe is calculated with the method for step C12
(Hloop,2, H2c, H2h) and the 2nd thermal-arrest tubing loop in heat-transfer fluid flow velocity vloop,2；
Sub-step C14: judgementIf being unsatisfactory for condition, sub-step is returned
C13 assumes the flow of the 2nd thermal-arrest tubing loop againIf meeting condition, sub-step C15 is executed；
Sub-step C15: it is passed to the 3rd, the 4th until in n-th of thermal-arrest tubing loop with the method for sub-step C13, sub-step C14
Hot fluid carries out hypothesis iteration, and the gross head for calculating each thermal-arrest tubing loop, corresponding cold main pipe and hot main pipe loses and judges, until
Iteration obtain the 3rd, the 4th until n-th of thermal-arrest tubing loop flow
Preferably, the basic parameter of the step A input slot type solar energy heat-collection field, comprising: heat-transfer fluid density,
Thermal conductivity, dynamic viscosity, enthalpy, specific heat capacity variation with temperature situation；The design parameter of each component of each heat collection unit is inputted,
Diameter, roughness and length including absorbing pipe, the diameter of glass enclosure tube；Input heat collecting field total flowInput heat collecting field
The heat collection unit of design parameter, including cold main pipe length, hot main pipe length, the number of thermal-arrest loop and each thermal-arrest loop
Number.
Preferably, the heat-transfer fluid mean temperature iterative initial value of each thermal-arrest loop uses formula meter in the step B
It calculates:
Wherein,For the heat-transfer fluid mean temperature of hypothesis；The four of the number of n expression heat collecting field thermal-arrest tubing loop/
One；nSCAIndicate the heat collection unit number of each heat collecting field thermal-arrest tubing loop；AsfIt is the collector area of heat collection unit；GbnIt is straight for normal direction
Penetrate irradiation level；θincFor the incidence angle of solar energy；IAM is incident angle modifier；ηoptFor heat collecting field optical efficiency；ηendFor collection
Thermal field end loss；ηshadowIntroduction, T are blocked for heat collecting fieldHTF,inFor given heat-transfer fluid inlet temperature；CpFor heat-transfer fluid
Specific heat capacity.
The utility model has the advantages that
Groove type solar heat collecting field temperature deviation quantitative evaluating method of the invention, can accurately evaluate slot type thermal-arrest
Outlet temperature and its temperature deviation between the pipe column of field.
Detailed description of the invention
Fig. 1 is the computation model flow chart of groove type solar heat collecting field temperature deviation quantitative evaluating method of the invention；
Fig. 2 is heat collecting field arrangement form schematic diagram of the invention；
Fig. 3 is heat collection unit schematic diagram of the invention.
Specific embodiment
Below with reference to Fig. 1, the present invention will be further explained.
The invention patent devise it is a kind of assessment slot type heat collecting field pipe column between outlet temperature deviation calculation method；
Groove type solar heat collecting field is usually by heat exchanger, cold main pipe, hot main pipe, pump and several solar energy heating loop structures
At such as Fig. 2.If heat collecting field has 4n thermal-arrest tubing loop, heat exchanger is in the east and west respectively has 2n, in the east the south of hot and cold main pipe
Respectively there be n thermal-arrest tubing loop in side, north side, and respectively there be n thermal-arrest tubing loop in southern side, the north side of the hot and cold main pipe in west.Cold with west side,
For the heat collecting field in hot main pipe southern side, hot and cold main pipe is respectively divided into n part, wherein the separation of cold main pipe is n collection
The intersection point of heat pipe loop and cold main pipe is westwards denoted as 1c point, 2c point ... nc point, thing side thermal-arrest from the point close to heat exchanger respectively
The split point of the cold main pipe in field is denoted as 0c；The separation of hot main pipe is the intersection point of n thermal-arrest tubing loop and hot main pipe, from close to heat exchange
The point of device is westwards denoted as 1h point, 2h point ... nh point respectively, and the point of the hot main pipe of thing side heat collecting field is denoted as 0h.Then, according to
This divides the head loss for seeking each thermal-arrest tubing loop and every section of hot and cold main pipe.
The present invention designs heat collection unit thermal balance model, including optical computing and balance heat transfer calculate, and carry out as follows
The step of calculate heat collecting field pipe column between outlet temperature deviation.
Step 1: inputting the physical parameter of heat-transfer fluid, including heat-transfer fluid density, thermal conductivity, dynamic viscosity, enthalpy, ratio
Thermal capacitance variation with temperature situation；The design parameter for inputting each component of each heat collection unit, diameter, roughness including absorbing pipe
And length, the diameter of glass enclosure tube；Input heat collecting field total flowThe design parameter of input heat collecting field, including cold main pipe are long
The number of the heat collection unit of degree, hot main pipe length, the number of thermal-arrest loop and each thermal-arrest loop；
Step 2: assuming that the heat-transfer fluid mean temperature of each thermal-arrest loop；
It iterates to calculate for the first time, the heat-transfer fluid mean temperature for each thermal-arrest loop that can be will assume is set as same number
Value, numerical value calculate as shown by the equation,
Wherein,For the heat-transfer fluid mean temperature of hypothesis；The four of the number of n expression heat collecting field thermal-arrest tubing loop/
One；nSCAIndicate the heat collection unit number of each heat collecting field thermal-arrest tubing loop；AsfIt is the collector area of heat collection unit；GbnIt is straight for normal direction
Penetrate irradiation level；θincFor the incidence angle of solar energy；IAM is incident angle modifier；ηoptFor heat collecting field optical efficiency；ηendFor collection
Thermal field end loss；ηshadowIntroduction is blocked for heat collecting field.THTF,inFor given heat-transfer fluid inlet temperature；CpFor heat-transfer fluid
Specific heat capacity.
Step 3-7: assuming that the flow of the 1st thermal-arrest tubing loop, iteration initial value takeAnd the 2nd, the 3rd is sought until
The flow of n thermal-arrest tubing loop.
For any positive integer i (0≤i≤n), the head loss of (i-1) c and (i-1) h point-to-point transmission includes i-th section
The head loss of cold main pipe, the head loss of i-th section of hot main pipe and the head loss of ic and ih point-to-point transmission, such as formula (2) institute
Show.
H(i-1)c,(i-1)h=Hic+Hih+Hic,ih, i=1,2 ..., n (2)
Wherein, HicRepresent the head loss of i-th section of hot main pipe；HihRepresent the head loss of i-th section of cold main pipe；Hic,ihGeneration
The head loss of table ic and ih point-to-point transmission.
The head loss H of ic and ih point-to-point transmissionic,ihThe head loss H of equal to i-th thermal-arrest tubing looploop,i, such as formula
(3) shown in.
Hic,ih=Hloop,i (3)
Wherein, Hloop,iIndicate the head loss of i-th of thermal-arrest tubing loop.
Therefore, the head loss of (i-1) a thermal-arrest tubing loop can be calculated with formula (4), the head of 0c and 0h point-to-point transmission
Loss can be calculated with formula (5).
Hloop,i-1=Hic+Hih+Hloop,i (4)
Thermal-arrest tubing loop head loss is made of two parts, i.e. linear loss and local losses.With i-th of thermal-arrest tubing loop
For, local losses is mainly made of two right-angle elbow pipes and two 90 ° of T shape bend pipes.Two 90 ° of T shape bend pipes are respectively arranged
In the junction of thermal-arrest tubing loop and cold main pipe, hot main pipe；Two right-angle elbow pipes are arranged in the most southern section of thermal-arrest tubing loop, and change
Become the flow direction of heat-transfer fluid in thermal-arrest tubing loop.Formula (6) is used to calculate the head loss of i-th of thermal-arrest tubing loop.
Wherein, λloop,iIt is the frictional resistant coefficient of i-th of thermal-arrest tubing loop；lloopIt is the length of i-th of thermal-arrest tubing loop
Degree, ξ1It is the coefficient of partial resistance of right-angle elbow pipe；ξ2It is the coefficient of partial resistance of 90 ° of T shape bend pipes；vloop,iIndicate i-th of thermal-arrest
The flow velocity of fluid in tubing loop.
The head loss of i-th section of cold main pipe or hot main pipe is made of linear loss and local losses.Local losses is by one
90 ° of T shape bend pipes cause, which is connected with i-th of thermal-arrest tubing loop.The head loss formula of i-th section of cold main pipe
(7) it calculates, the head loss of i-th section of hot main pipe is calculated with formula (8).
Wherein, λicIndicate the frictional resistant coefficient of i-th section of cold main pipe；licFor the length of i-th section of cold main pipe；ξicIt is i-th section
The coefficient of partial resistance of 90 ° of T shape bend pipes of cold main pipe, vicFor the flow velocity of heat-transfer fluid in i-th section of cold main pipe.
Wherein, λihIndicate the frictional resistant coefficient of i-th section of hot main pipe；lihFor the length of i-th section of hot main pipe；ξihIt is i-th section
The coefficient of partial resistance of 90 ° of T shape bend pipes of hot main pipe；vihFor the flow velocity of heat-transfer fluid in i-th section of hot main pipe.
Step 8: rightIf being unsatisfactory for condition, return step 3 assumes the 1st thermal-arrest pipe ring again
The flow m on road1；If the condition of satisfaction thens follow the steps 9；
Step 9: the outlet temperature of heat-transfer fluid in each thermal-arrest tubing loop being calculated according to heat collection unit thermal balance model and is put down
Equal temperature；Solar energy heating loop is used to the solar energy that heat collecting field absorbs being transmitted to the external world for absorbing solar energy, heat exchanger,
Pump is for circulation power needed for providing heat-transfer fluid.Heat exchanger, pump are arranged in the center of heat collecting field, solar energy heating loop pair
Claim the east and west sides for being arranged in heat exchanger, pump.Each thermal-arrest tubing loop has several heat collection units to be connected in series, and heat collection unit is by anti-
Mirror, glass enclosure tube, absorbing pipe and heat-transfer fluid is penetrated to constitute.The sun is gathered in after reflecting mirror reflects by glass enclosure tube
Absorbing pipe, the solar heat that absorbing pipe is absorbed are transmitted to heat exchanging fluid.Each thermal-arrest tubing loop is connected by two main pipes, from pump
The cold heat exchanging fluid of outlet flows out cold main pipe, and enters each thermal-arrest tubing loop；Heat exchanging fluid absorbs the sun in each thermal-arrest tubing loop
Hot main pipe can be entered afterwards, it is as shown in Figure 3 to return to heat exchanger heat collection unit schematic diagram.
The heat exchange amount of heat collection unit can be calculated according to heat collection unit thermal balance model, be described as follows:
Shown in thermal balance relationship such as formula (9) at thermal-arrest tube wall.
Wherein,For the solar energy for projecting thermal-arrest pipe outer wall,For the sun absorbed by heat exchanging fluid in thermal-collecting tube
Can,Radiant exothermicity between thermal-collecting tube and glass enclosure tube,Pair between thermal-collecting tube and glass enclosure tube
Flow heat exchange amount
Shown in thermal balance relationship such as formula (10) at glass enclosure tube,
Wherein,For the solar radiation amount for projecting glass enclosure tube；For the heat exchange of glass enclosure tube and day space
Amount；For the heat exchange amount of glass enclosure tube and environment.
The solar radiation amount summation for projecting glass enclosure tube and absorbing pipe meets formula (11).Wherein project cloche
The solar radiation amount of pipe is calculated by formula (12), and the solar radiation amount for projecting absorbing pipe is calculated by formula (13).
Wherein, τenvFor the transmissivity of glass enclosure tube；αabsFor the absorptivity of absorbing pipe；αenvFor the absorptivity of glass enclosure tube
Shown in the heat such as formula (14) that heat-transfer fluid absorbs.
Wherein, h1For the convection transfer rate of heat-transfer fluid, D is the diameter of thermal-collecting tube, lSCARepresent the length of heat collection unit
Degree, TabsFor the absolute temperature of absorbing pipe, THTF,iFor the inlet temperature of heat-transfer fluid, THTF,oFor the outlet temperature of heat-transfer fluid；
Here temperature is the heat-transfer fluid out temperature to each thermal-arrest tubing loop.
Shown in the calculation method of Radiant exothermicity between thermal-collecting tube and glass enclosure tube such as formula (15).
Wherein σ be Boltzmann constant, 5.67 × 10-8W/(m2K4)；εabs,oFor the emissivity of absorbing pipe outside wall surface；εenv,i
For the emissivity of glass enclosure tube inner wall；Dabs,oFor the outer diameter of absorbing pipe；Denv,iFor the internal diameter of glass enclosure tube；TenvFor glass enclosure tube
Absolute temperature.
For the heat exchange amount of glass enclosure tube and day spaceCalculating such as formula (16) shown in
Wherein, h3Convection transfer rate between glass enclosure tube and environment；TatmFor the absolute temperature of environment.
For shown in glass enclosure tube and the heat exchange amount of environment such as formula (17).
Wherein, εenv,oFor the outside wall surface emissivity of glass enclosure tube.
Step 10: the assumption value that step 9 is come to each thermal-arrest tubing loop mean temperature and step 2 compares respectively, if
Absolute error terminates operation, obtains the outlet temperature of thermal-arrest tubing loop, and carry out the comparison of outlet temperature deviation at 0.5 DEG C；It is no
Then, the heat-transfer fluid mean temperature of each thermal-arrest loop is again assumed in return step 2.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of groove type solar heat collecting field temperature deviation quantitative evaluating method, which comprises the following steps:
Step A: establishing the heat collection unit thermal balance model of groove type solar heat collecting field, inputs the basic of slot type solar energy heat-collection field
Parameter, the design parameter of each each component of heat collection unit, heat collecting field always flow in physical parameter, thermal-arrest loop including heat-transfer fluid
AmountWith the design parameter of heat collecting field；
Step B: assuming that the heat-transfer fluid mean temperature of each thermal-arrest loop；
Step C: according to heat collecting field total flow in step AWith the average temperature value in the design parameter and step B of heat collecting field, meter
Calculate the flow for obtaining heat-transfer fluid in each thermal-arrest tubing loop；
Step D: flat in conjunction with heat collection unit heat according to the numerical information of the temperature of the heat-transfer fluid in step B and step C and flow
Weigh model, that is, thermal balance relationship, calculates the outlet temperature and mean temperature of heat-transfer fluid in each thermal-arrest tubing loop；
Step E: each collection that the heat-transfer fluid mean temperature and step B that resulting each thermal-arrest loop is calculated in judgment step D are assumed
The heat-transfer fluid mean temperature absolute deviation of hot loop, if so, terminating operation, obtains thermal-arrest tubing loop whether in 0.5 DEG C
Outlet temperature, and carry out the comparison of outlet temperature deviation；If it is not, then return step B, assumes the heat transfer of each thermal-arrest loop again
Fluid mean temperature, circulate operation step B to step E.
2. a kind of groove type solar heat collecting field temperature deviation quantitative evaluating method according to claim 1, which is characterized in that
The step C obtains the calculation method of the flow of heat-transfer fluid in each thermal-arrest tubing loop, comprising:
Step C1: assuming that the flow of first thermal-arrest tubing loop isThe 2nd to n-th collection of acquisition is calculated separately using iterative method
The flow of heat pipe loop
Step C2: judgementD is entered step if meeting condition, otherwise return step C1, assume the 1st again
The flow of a thermal-arrest tubing loopCirculate operation step C1 to step C2.
3. a kind of groove type solar heat collecting field temperature deviation quantitative evaluating method according to claim 2, which is characterized in that
The heat collecting field includes heat exchanger, cold main pipe, hot main pipe, pump and 4n thermal-arrest tubing loop, and heat exchanger, pump are arranged in heat collecting field
Center, thermal-arrest tubing loop is symmetrically arranged in the two sides of heat exchanger, pump, each thermal-arrest tubing loop connected by several heat collection units and
At each thermal-arrest tubing loop is connected by cold main pipe with hot main pipe, and cold heat exchanging fluid flows out cold main pipe, and enters each thermal-arrest pipe ring
Road, heat exchanging fluid enter hot main pipe after each thermal-arrest tubing loop absorbs solar energy, recycle between the thermal-arrest tubing loop in heat collecting field
Flowing.
4. a kind of groove type solar heat collecting field temperature deviation quantitative evaluating method according to claim 3, which is characterized in that
The step C1, further includes:
Sub-step C11: assuming that the flow of the 1st thermal-arrest tubing loopIteration initial value takes
Sub-step C12: to ipsilateral cold main pipe, hot main pipe and thermal-collecting tube loop is located at, cold main pipe and hot main pipe are respectively classified into n
A part, each thermal-arrest tubing loop respectively correspond one section of cold main pipe and one section of hot main pipe, wherein the separation of cold main pipe is n
The intersection point of thermal-arrest tubing loop and cold main pipe is westwards denoted as 1c point, 2c point ... nc point, thing side collection from the point close to heat exchanger respectively
The split point of the cold main pipe of thermal field is denoted as 0c；The separation of hot main pipe is the intersection point of n thermal-arrest tubing loop and hot main pipe, is changed from close
The point of hot device is westwards denoted as 1h point, 2h point ... nh point respectively, and the point of the hot main pipe of thing side heat collecting field is denoted as 0h, calculates first
Frictional resistant coefficient (the λ of 1st thermal-arrest tubing loop, the cold main pipe of paragraph 1 and the hot main pipe of paragraph 1loop,1, λ1c, λ1h) and part resistance
Force coefficient (ξ1, ξ2, ξ1c, ξ1h), and then calculate the gross head of first thermal-arrest tubing loop, the cold main pipe of paragraph 1 and the hot main pipe of paragraph 1
Lose (Hloop,1, H1c, H1h), to calculate the flow velocity v of heat-transfer fluid in the 1st thermal-arrest tubing looploop,1；
Sub-step C13: assuming that the flow of the 2nd thermal-arrest tubing loopAnd obtain the flow of heat-transfer fluid in the thermal-arrest tubing loop；
The gross head loss of the 2nd thermal-arrest tubing loop, the 2nd section of cold main pipe and the 2nd section of hot main pipe is calculated with the method for step C12
(Hloop,2, H2c, H2h) and the 2nd thermal-arrest tubing loop in heat-transfer fluid flow velocity vloop,2；
Sub-step C14: judgementIf being unsatisfactory for condition, sub-step C13 is returned,
The flow of the 2nd thermal-arrest tubing loop is assumed againIf meeting condition, sub-step C15 is executed；
Sub-step C15: with sub-step C13, sub-step C14 method to the 3rd, the 4th until heat transfer stream in n-th of thermal-arrest tubing loop
Body carries out hypothesis iteration, and the gross head for calculating each thermal-arrest tubing loop, corresponding cold main pipe and hot main pipe loses and judges, until iteration
Obtain the 3rd, the 4th until n-th of thermal-arrest tubing loop flow
5. a kind of groove type solar heat collecting field temperature deviation quantitative evaluating method according to claim 1, which is characterized in that
The basic parameter of the described step A input slot type solar energy heat-collection field, comprising: heat-transfer fluid density, thermal conductivity, dynamic viscosity,
Enthalpy, specific heat capacity variation with temperature situation；The design parameter for inputting each component of each heat collection unit, including the straight of absorbing pipe
Diameter, roughness and length, the diameter of glass enclosure tube；Input heat collecting field total flowThe design parameter of heat collecting field is inputted, including cold
The number of the heat collection unit of main pipe length, hot main pipe length, the number of thermal-arrest loop and each thermal-arrest loop.
6. a kind of groove type solar heat collecting field temperature deviation quantitative evaluating method according to claim 1, which is characterized in that
The heat-transfer fluid mean temperature iterative initial value of each thermal-arrest loop is calculated using formula in the step B:
Wherein,For the heat-transfer fluid mean temperature of hypothesis；N indicates a quarter of the number of heat collecting field thermal-arrest tubing loop；
nSCAIndicate the heat collection unit number of each heat collecting field thermal-arrest tubing loop；AsfIt is the collector area of heat collection unit；GbnFor normal direction direct projection
Irradiation level；θincFor the incidence angle of solar energy；IAM is incident angle modifier；ηoptFor heat collecting field optical efficiency；ηendFor thermal-arrest
Field end loss；ηshadowIntroduction, T are blocked for heat collecting fieldHTF,inFor given heat-transfer fluid inlet temperature；CpFor heat-transfer fluid
Specific heat capacity.
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|---|---|---|---|---|
| CN114035437A (en) * | 2021-11-25 | 2022-02-11 | 云南电网有限责任公司电力科学研究院 | Anti-interference control method and device for outlet temperature of trough type solar heat collection field |
| CN114739022A (en) * | 2022-04-11 | 2022-07-12 | 中国船舶重工集团新能源有限责任公司 | Control method and device for trough type heat collector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114035437A (en) * | 2021-11-25 | 2022-02-11 | 云南电网有限责任公司电力科学研究院 | Anti-interference control method and device for outlet temperature of trough type solar heat collection field |
| CN114035437B (en) * | 2021-11-25 | 2023-11-21 | 云南电网有限责任公司电力科学研究院 | Anti-interference control method and device for outlet temperature of trough type solar thermal-arrest field |
| CN114739022A (en) * | 2022-04-11 | 2022-07-12 | 中国船舶重工集团新能源有限责任公司 | Control method and device for trough type heat collector |
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