CN202710284U - Thermal performance measurement system of solar thermal collector - Google Patents
Thermal performance measurement system of solar thermal collector Download PDFInfo
- Publication number
- CN202710284U CN202710284U CN 201220037369 CN201220037369U CN202710284U CN 202710284 U CN202710284 U CN 202710284U CN 201220037369 CN201220037369 CN 201220037369 CN 201220037369 U CN201220037369 U CN 201220037369U CN 202710284 U CN202710284 U CN 202710284U
- Authority
- CN
- China
- Prior art keywords
- acquisition unit
- data acquisition
- endothermic tube
- voltage
- thermal collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to a thermal performance measurement system of a solar thermal collector. The measurement system is formed by the solar thermal collector, a voltage regulating power supply, a current transducer, a voltage transducer, a data acquisition unit, a thermocouple, a platinum resistor and a microcomputer. According to the utility model, aiming at a structure characteristic of a current groove-type solar thermal collector, a metal heat absorption pipe of the thermal collector is taken as a heater so as to carry out heating on the thermal collector. Through applying a constant current and a voltage on two ends, a uniform and stable temperature field without a temperature gradient is formed on the heat absorption pipe. A principle of the system of the utility model is simple. The generated temperature field is uniform. A measurement temperature difference range is large and the system is easy to be realized.
Description
Technical field
The utility model relates to heat performance of solar heat collector and measures system, belongs to solar energy thermal-power-generating and solar energy high temperature heat utilization technology detection field.
Background technology
Along with socioeconomic develop rapidly, the extensive application of fossil energy has caused serious problem of environmental pollution, simultaneously the limited reserves of fossil energy so that its will within the several years in future, consume totally.Therefore, regenerative resource more and more is subject to people's attention in recent years.Solar energy generation technology wherein changes into high-grade electric energy with low-grade solar radiation.Solar electrical energy generation is divided into two types of solar energy power generating and solar energy thermal-power-generatings.Wherein solar energy thermal-power-generating is the sun power that first sunshine is focused into high heat flux by condenser, then with the solar thermal collector that is installed on its focus the solar absorption of this high heat flux is become high-temperature steam, then pushing turbine running, generating.Because the endothermic tube in the heat collector has higher working temperature and endothermic tube surface selectivity coating has certain emissivity, solar thermal collector also transmits certain heat energy in environment when absorbing the high heat flux solar radiant energy, form the thermal loss of heat collector.The size of this thermal loss and selective coating emissivity has determined the quality of thermal performance of collectors.
In the existing heat performance of solar heat collector mensuration system, the mensuration system documentation of U.S. SANDIA National Laboratory is described, adopt high temperature heat conductive oil heating heat collector to carry out work, the enthalpy difference that heat collector is imported and exported is the thermal loss of heat collector, can satisfy the mensuration requirement of heat collector thermal behavior, but have following defective:
1. system realizes that cost is high, complexity, and profile is huge, heavy;
2. system must be installed in outdoorly, be difficult to realize stable ambient wind velocity;
3. conduction oil has toxicity as heat-transfer working medium, and ingress of air is easy to burning, is easy to decomposition, coking under the high temperature, and working temperature is lower than 400 ℃;
4. the hot fluid working pressure is high, and pipe system is complicated, and it is complicated to measure process operation, needs a plurality of professionals to cooperate and jointly finishes.
The mensuration system of American National regenerative resource laboratory (NREL) and German Aerospace Center (DLR) adopts a plurality of electric heating tubes of interpolation as heating source heat collector to be heated, the electric power sum of a plurality of electric heater consumption of endothermic tube inside is the thermal loss of heat collector, can satisfy the mensuration requirement of heat collector thermal behavior, but also have following defective:
1. many well heaters need respectively a sleeving temperature control system, and systematic comparison is complicated;
2. many temperature control systems need to all be stabilized in the same temperature value with the temperature of its pipeline section of controlling, and the difficulty of realization is larger, and the time of finishing operating point measurement needs is long;
3. although the temperature sensor that adopts is realized demarcating, but because inhomogeneous each section of the endothermic tube temperature that causes of electric heater for heating power skewness on axial and circumferencial direction, temperature sensor position, different from heat absorption tube wall contact tightness degree cause the system measurement resultant error larger;
The utility model content:
The purpose of this utility model provides the thermal behavior that is used for solar thermal collector that a kind of finding speed is fast, working temperature is high, simple in structure and measures system.Concrete technical scheme is as follows:
A kind of heat performance of solar heat collector mensuration system comprises solar thermal collector 1, voltage controller power source 4, current transducer 5, voltage transmitter 6, data acquisition unit 7, thermopair 8, platinum resistance 9 and microcomputer 11, solar thermal collector 1 is by endothermic tube 2, glass bushing 3 and corrugated tube 10 consist of, the output terminal of voltage controller power source 4 is connected to the two ends of endothermic tube 2 by cable, current transducer 5 is serially connected between voltage controller power source 4 and the endothermic tube 2, its output signal line is connected on the data acquisition unit 7, two input ends of voltage transmitter 6 are connected to the weld of endothermic tube 2 two ends and corrugated tube 10 by signal wire, its output signal line is connected on the data acquisition unit 7, thermopair 8 is welded on the inwall of endothermic tube 2, its output signal line is connected on the data acquisition unit 7, platinum resistance 9 places environment, be fixed in the environment apart from 1 meter outside the glass bushing 3, its output signal line is connected on the data acquisition unit 7, and data acquisition unit 7 is connected with microcomputer 11 by signal wire; Voltage controller power source 4 provides burning voltage for endothermic tube 2 two ends, utilizes the Joule heating effect of the endothermic tube with even resistance that solar thermal collector 1 is heated, in endothermic tube 2 wall circumferencial directions and the uniform temperature field of axial generation; Current transducer 5 is measured and is flow through the electric current of endothermic tube 2 and be sent to data acquisition unit 7, voltage transmitter 6 is measured the voltage between two corrugated tubes 10 and endothermic tube 2 welds and is sent to data acquisition unit 7, thermopair 8 is measured the internal face temperature of endothermic tube 2 and is sent to data acquisition unit 7, platinum resistance 9 measures ambient temperature also are sent to data acquisition unit 7, data acquisition unit 7 sends temperature, electric current, the voltage signal that collects to microcomputer 11, microcomputer record, storage temperature, electric current, voltage data.The straight-through type solar energy heat collector that described solar thermal collector 1 is used for trough type solar power generation.
Measure system based on above-mentioned a kind of heat performance of solar heat collector and can adopt following heat performance of solar heat collector assay method, may further comprise the steps:
(1) assembling solar heat collector thermal behavior is measured system, and the solar thermal collector both ends are incubated parcel;
(2) open voltage controller power source, its output voltage is set as the A volt, to solar thermal collector both ends on-load voltage, utilize the Joule heating effect of the endothermic tube with even resistance that solar thermal collector is heated, in endothermic tube wall circumferencial direction and the uniform temperature field of axial generation;
(3) in continuous 30 minutes, two corrugated tubes of measuring when voltage transmitter and the voltage fluctuation between the endothermic tube weld are less than ± 0.05 volt, the current transducer measurement is flow through the current fluctuation of endothermic tube less than ± 0.25 ampere, the internal face temperature fluctuation of thermocouple measurement endothermic tube is less than ± 0.2 ℃, the environmental temperature fluctuation that platinum resistance records apart from 1 meter outside the glass bushing is during less than ± 0.25 ℃, be considered as in the situation corresponding to voltage controller power source output A volt, system reaches steady state (SS), this moment, data acquisition unit began to gather above-mentioned voltage, electric current, internal face temperature and the ambient temperature data of endothermic tube are no less than 45 minutes, and send it to microcomputer;
(4) output voltage of change voltage controller power source, order according to step (2) and (3), same solar thermal collector measured, data acquisition unit gathers respectively corresponding to electric current, voltage, endothermic tube internal face temperature and ambient temperature data under the different output voltage operating modes of voltage controller power source, and is stored in the microcomputer;
(5) calculate respectively the difference of solar thermal collector unit length thermal loss, endothermic tube internal face temperature and environment temperature under the different output voltage operating modes of voltage controller power source, utilize the method for fitting of a polynomial finally to obtain the poor of the endothermic tube internal face temperature of this solar thermal collector and environment temperature, and the correlation between the unit length thermal loss; The unit length thermal loss of described solar thermal collector equals the electric power of solar thermal collector consumption divided by solar thermal collector length; The electric power of described solar thermal collector consumption equals the voltage and the product that flows through the electric current of endothermic tube between two corrugated tubes and the endothermic tube weld; The length of described solar thermal collector equals the length between two corrugated tubes and the endothermic tube weld; Described endothermic tube internal face and circumstance of temperature difference equal endothermic tube internal face temperature and deduct environment temperature.
Beneficial effect:
The utility model heat performance of solar heat collector measures that system and method is simple in structure, finding speed fast, low cost of manufacture, assembling, conveniently moving.
Description of drawings:
Fig. 1 is that the utility model heat performance of solar heat collector is measured the system of systems block diagram;
Fig. 2 is that the thermal loss of 2 different solar thermal collectors recording of the utility model heat performance of solar heat collector mensuration system is with difference variation.
Fig. 3 is the utility model method flow diagram
Embodiment:
Accompanying drawings embodiment is as follows:
Fig. 1 is that the utility model heat performance of solar heat collector is measured the system of systems block diagram, wherein 1 is trough type solar heat-collector, 2 is endothermic tube, and 3 is glass bushing, and 4 is the 0-10V dc voltage regulator power supply, 5 is the 0-500A current transducer, 6 is the 0-10V voltage transmitter, and 7 is the 34970A data acquisition unit, and 8 is thermopair, 9 is platinum resistance, and 10 is that corrugated tube, 11 is microcomputer.Native system instrument, instrument, cable etc. all can be bought in market.
Trough type solar heat-collector 1 is made of endothermic tube 2, glass bushing 3 and corrugated tube 10, and endothermic tube 2 is uniform 304 stainless pipes of wall thickness for material; The power supply of dc voltage regulator power supply 4 outputs is connected to endothermic tube 2 two ends by cable, forms heating circuit; Be serially connected in the current value that the current transducer 5 on the cable is measured by endothermic tube 2, and output signal sent to 01 port of data acquisition unit 34970A; Voltage transmitter 6 connects respectively two ends corrugated tube 10 and endothermic tube 2 welds by two signal wires, and output voltage signal is sent to 02 port of data acquisition unit 34970A; Thermopair 8 is close on the inwall of endothermic tube 2, is used for measuring the internal face temperature of endothermic tube 2, and output signal is sent to 03 port of data acquisition unit 34970A; Platinum resistance 9 places the environment away from trough type solar heat-collector 1 about 1 meter, is used for measures ambient temperature, and output signal is sent to 04 port of data acquisition unit 34970A; Data acquisition unit 7 is connected with microcomputer 11 by signal wire, and sends temperature, electric current, the voltage signal that collects to microcomputer 11, microcomputer record, storage temperature, electric current, voltage data.
Before the system works, first the heat collector both ends are incubated, it is thick that insulation layer thickness is not less than 10cm.Then the open system power supply transfers to 3.0 volts with power supply 4 output voltages.In the process that endothermic tube 2 heats, want the warranty test environment temperature be stabilized in ± 0.25 ℃ in, the voltage that detects, electric current, endothermic tube inner wall temperature, the environment temperature of while observed data collecting unit 7, until in 30 minutes voltage fluctuation less than ± 0.05 volt, current fluctuation less than ± 0.25 ampere, the fluctuation of endothermic tube inner wall temperature less than ± 0.2 ℃, environmental temperature fluctuation less than ± 0.25 ℃, it is stable that the system of being considered as reaches, data acquisition unit 7 beginning image data, acquisition time is no less than 45 minutes, and sends data to microcomputer 11.The output voltage of voltage controller power source is made as respectively 3.5,4.0,4.5,5.0,5.5,6.0 volts, corresponding to different output voltages, behind system stability, data acquisition unit 7 begins to gather voltage, electric current, endothermic tube inner wall temperature, ambient temperature data, and acquisition time is no less than 45 minutes.
Test figure obtained above is processed in accordance with the following methods: supposing to collect voltage between two corrugated tubes and the endothermic tube weld and be U, current transducer measurement, to flow through the electric current of endothermic tube be that the internal face temperature of I, thermocouple measurement endothermic tube is T
01, platinum resistance is T apart from the environment temperature that 1 meter outside the glass bushing records
02, solar thermal collector length is L, then the thermal loss Q of unit length solar thermal collector is calculated by following formula:
Endothermic tube inwall and circumstance of temperature difference Δ T are calculated by following formula:
ΔT＝T
01-T
02，℃
Calculate respectively the value of one group of Q and the Δ T of every heat collector by above two formula, utilize polynomial fitting method that Q and Δ T are carried out match and can obtain the function correlation that every solar thermal collector thermal loss Q changes with temperature difference T.Two different solar thermal collector unit length thermal loss Q with the variation relation curve of temperature difference T as shown in Figure 2, can estimate the relative superior or inferior of heat performance of solar heat collector by the thermal loss size of two heat collectors under the more identical temperature difference: under the identical temperature difference condition, the thermal behavior of the larger explanation solar thermal collector of thermal loss is poorer.Thermal loss from Fig. 2 can see that with the difference variation curve under the identical temperature difference, obviously greater than the thermal loss of heat collector 2, the thermal behavior of this explanation heat collector 2 is better than heat collector 1 to the thermal loss of heat collector 1.
For avoiding unrelated person to the maloperation of rapid measuring system, the cipher switch of its switching on and shutting down of control is set at voltage controller power source 4.
Claims (2)
1. a heat performance of solar heat collector is measured system, it is characterized in that: comprise solar thermal collector (1), voltage controller power source (4), current transducer (5), voltage transmitter (6), data acquisition unit (7), thermopair (8), platinum resistance (9) and microcomputer (11), solar thermal collector (1) is by endothermic tube (2), glass bushing (3) and corrugated tube (10) consist of, the output terminal of voltage controller power source (4) is connected to the two ends of endothermic tube (2) by cable, current transducer (5) is serially connected between voltage controller power source (4) and the endothermic tube (2), its output signal line is connected on the data acquisition unit (7), two input ends of voltage transmitter (6) are connected to the weld of endothermic tube (2) two ends and corrugated tube (10) by signal wire, its output signal line is connected on the data acquisition unit (7), thermopair (8) is welded on the inwall of endothermic tube (2), its output signal line is connected on the data acquisition unit (7), platinum resistance (9) places environment, be fixed in the environment apart from 1 meter outside the glass bushing (3), its output signal line is connected on the data acquisition unit (7), and data acquisition unit (7) is connected with microcomputer (11) by signal wire; Voltage controller power source (4) provides burning voltage for endothermic tube (2) two ends, the Joule heating effect that utilization has the endothermic tube of even resistance heats solar thermal collector (1), in endothermic tube (2) wall circumferencial direction and the uniform temperature field of axial generation; Current transducer (5) is measured and is flow through the electric current of endothermic tube (2) and be sent to data acquisition unit (7), voltage transmitter (6) is measured the voltage between two corrugated tubes (10) and endothermic tube (2) weld and is sent to data acquisition unit (7), thermopair (8) is measured the internal face temperature of endothermic tube (2) and is sent to data acquisition unit (7), platinum resistance (9) measures ambient temperature also is sent to data acquisition unit (7), data acquisition unit (7) is with the temperature that collects, electric current, voltage signal sends microcomputer (11), microcomputer record to, storage temperature, electric current, voltage data.
2. heat performance of solar heat collector according to claim 1 is measured system, it is characterized in that: the straight-through type solar energy heat collector that described solar thermal collector 1 is used for trough type solar power generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220037369 CN202710284U (en) | 2012-02-06 | 2012-02-06 | Thermal performance measurement system of solar thermal collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220037369 CN202710284U (en) | 2012-02-06 | 2012-02-06 | Thermal performance measurement system of solar thermal collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202710284U true CN202710284U (en) | 2013-01-30 |
Family
ID=47590575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220037369 Expired - Lifetime CN202710284U (en) | 2012-02-06 | 2012-02-06 | Thermal performance measurement system of solar thermal collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202710284U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589844A (en) * | 2012-02-06 | 2012-07-18 | 北京工业大学 | Thermal performance measurement system of solar thermal collector and method |
| CN107703182A (en) * | 2017-08-25 | 2018-02-16 | 中国科学院电工研究所 | The optical efficiency measurement apparatus and its method of testing of groove type solar thermal-collecting tube |
-
2012
- 2012-02-06 CN CN 201220037369 patent/CN202710284U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589844A (en) * | 2012-02-06 | 2012-07-18 | 北京工业大学 | Thermal performance measurement system of solar thermal collector and method |
| CN102589844B (en) * | 2012-02-06 | 2014-12-03 | 北京工业大学 | Thermal performance measurement system of solar thermal collector and method |
| CN107703182A (en) * | 2017-08-25 | 2018-02-16 | 中国科学院电工研究所 | The optical efficiency measurement apparatus and its method of testing of groove type solar thermal-collecting tube |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Lüpfert et al. | Experimental analysis of overall thermal properties of parabolic trough receivers | |
| Chen et al. | Experimental investigation of a novel LCPV/T system with micro-channel heat pipe array | |
| Del Col et al. | Thermal performance of flat plate solar collectors with sheet-and-tube and roll-bond absorbers | |
| Kutscher et al. | Generation of a parabolic trough collector efficiency curve from separate measurements of outdoor optical efficiency and indoor receiver heat loss | |
| Ong et al. | Thermal and electrical performance of a hybrid design of a solar-thermoelectric system | |
| Jiang et al. | Characterization of novel mid-temperature CPC solar thermal collectors | |
| CN102967625A (en) | Heat waste detection system and method for high temperature vacuum solar heat collection pipe heating through electrifying inner tube | |
| Hassanzadeh et al. | Coupled optical-thermal modeling, design and experimental testing of a novel medium-temperature solar thermal collector with pentagon absorber | |
| CN201974393U (en) | High temperature phase change energy storage material thermal cycling stability automatic testing device | |
| Xu et al. | Parallel experimental study of a novel super-thin thermal absorber based photovoltaic/thermal (PV/T) system against conventional photovoltaic (PV) system | |
| Tong et al. | Comparative study on the thermal performance of evacuated solar collectors with U-tubes and heat pipes | |
| Yamaguchi et al. | Preliminary study on a solar water heater using supercritical carbon dioxide as working fluid | |
| CN103615624B (en) | A kind of fuse salt pipe heating device | |
| CN102589844B (en) | Thermal performance measurement system of solar thermal collector and method | |
| Zhang et al. | An experimental investigation on characteristics of supercritical CO2‐based solar Rankine system | |
| CN202710284U (en) | Thermal performance measurement system of solar thermal collector | |
| Fathabadi | Novel solar collector: Evaluating the impact of nanoparticles added to the collector’s working fluid, heat transfer fluid temperature and flow rate | |
| CN102494871A (en) | Method for testing ageing of vacuum high-temperature solar collector tube | |
| CN202903711U (en) | Heat loss detection device of high-temperature vacuum solar heat-collecting tube | |
| Mehla et al. | Annual performance evaluation of evacuated tube solar air collector with phase change material | |
| Podder et al. | Performance investigation of an innovative design of a small sized single glazed solar PV/T water collector for the climatic condition of a site in North East India: An experimental study | |
| CN105806883B (en) | A kind of heating in vacuum formula slot type high-temperature heat-collection pipe heat waste test macro and method | |
| CN109855843A (en) | Parabolic trough type solar thermal collector efficiency dynamic checkout unit and method | |
| CN102538886B (en) | Extra-pipe binding type thermal pulse gas flowmeter capable of resisting ambient temperature disturbances | |
| CN202928973U (en) | Inner tube ohmic heating type high-temperature vacuum solar heat collection tube heat loss detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |
|
| CX01 | Expiry of patent term |