CN106769136B - Paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device and measurement method - Google Patents
Paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device and measurement method Download PDFInfo
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Abstract
A kind of paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device and measurement method, its conduction oil cyclic part is imported and exported by its conduction oil with the water side of water- to-water heat exchanger (1) to be connected with cooling cycle part, conduction oil cyclic part passes through piping connection with the bottom of the conduction oil expanded by heating tank (13) of nitrogen-sealed part by the top of its conduction oil and water- to-water heat exchanger (1), and measuring instrument is partially installed on conduction oil cyclic part or its neighbouring position.Using the measurement method of measuring device of the present invention, based on the heat transfer fluid exit temperature ramp de under groove type heat collector tracing collection operating condition, measurement obtains heat-transfer fluid inlet temperature, heat transfer fluid exit temperature, the volume flow of heat-transfer fluid, sun normal direction direct projection irradiation level, ambient air temperature and ambient air velocity, further according to these physical quantitys and solar incident angle, the thermal efficiency of groove type heat collector is calculated.
Description
Technical field
The present invention relates to a kind of paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device and measurement methods.
Background technique
Paraboloid trough type solar heat-collector is by making the paraboloid flute profile condenser of one-dimensional rotary motion for direct sunlight
Radiation, which is assembled, forms a focal line, and the sunlight heating being converged is located at the absorbing pipe at focal line, and then transfers heat to stream
Heat-transfer fluid through absorbing pipe, realization convert solar energy into thermal energy.It is widely used in industrial process heat, solar energy sea
The technical fields such as water desalination, solar airconditioning, solar heat chemistry, solar hydrogen making and solar energy thermal-power-generating.The thermal efficiency is to throw
The key technology evaluation index of object plane trough type solar heat-collector application, is the homogenizing cost of energy and capital of slot type collecting system
Property expenditure etc. economic indicators calculation basis.There has been no the groove type heat collector thermal efficiency surveys for live dynamic changing condition at present
Measure the world or the China national grade standard of device and method.In particular with " actively supporting photo-thermal in national " 13 " planning
The it is proposed of power generation ", the market of slot type photo-thermal power generation will expand rapidly, therefore to groove type heat collector heating efficiency measuring device and method
Demand it is increasingly strong.
Unite States Standard ASHRAE 93 provides a kind of measurement for being applicable to the paraboloid trough type solar heat-collector thermal efficiency
Device and measurement method.The measurement method of the standard is the two-parameter steady state measurement method that one kind does not include solar incident angle, because
This requires sunray to be closely normally incident to the daylighting plane of groove type heat collector in entire measurement process, this needs to measure dress
Set including one can horizontal rotary pedestal be placed under groove type heat collector and cooperate with tracking position of sun with groove type heat collector.But
It is that this is unable to satisfy by the groove type heat collector that uniaxiality tracking sunlight completes collection thermal process at all and is wanted at the scene under service condition
It asks.Moreover, being different from the measuring condition in laboratory, in-site measurement condition, which often lacks corresponding regulation and control equipment, makes slot type
The inlet temperature of heat collector is stablized within 2%.Thermal efficiency dynamic measurement device proposed by the present invention and measurement method are suitable for
Groove type heat collector under field condition operating condition can be realized in groove type heat collector tracing collection state in measurement model for a long time
The continuous measurement of each parameter does not need accurate regulation and control equipment to stablize the inlet temperature of groove type heat collector, to live slot
Formula collector system itself control operation compatibility.
Summary of the invention
The purpose of the present invention is to propose to a kind of for the paraboloid trough type solar heat-collector heat that heat-transfer fluid is conduction oil
The dynamic measurement device and measurement method of efficiency.
The present invention is based on outdoor field work conditions, utilize the heat transfer fluid exit under groove type heat collector tracing collection operating condition
Temperature ramp de, continuous measurement obtain heat-transfer fluid inlet temperature, heat transfer fluid exit temperature, heat-transfer fluid volume flow
The physical quantitys such as amount, sun normal direction direct projection irradiation level (DNI), ambient air temperature and ambient air velocity are considering heat-transfer fluid
On the basis of the inlet and outlet time lag relationship of heat collector caused by flowing is modified, reasonable measurement hardware configuration and the thermal efficiency are provided
Calculation and analysis methods.
Paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device uses closed circulation system, mainly by conduction oil
Cyclic part, cooling cycle part, nitrogen-sealed part and measuring instrument part composition.Conduction oil cyclic part is thermally conductive by its
Oil is imported and exported with the water side of water- to-water heat exchanger to be connected with cooling cycle part, and conduction oil cyclic part is changed by its conduction oil with water
The top of hot device with the conduction oil expanded by heating tank of nitrogen-sealed part bottom by piping connection, it is each in measuring instrument part
Instrument is mounted on conduction oil cyclic part or its neighbouring position.
Conduction oil cyclic part includes that conduction oil and water- to-water heat exchanger, filter, heat conduction oil circulating pump, heat transfer oil flow control
Valve, heat collector import security valve, groove type heat collector, heat collector outlet relief valve and connecting line.Conduction oil and water- to-water heat exchanger
Conduction oil side outlet is connected to the filter by pipeline, and the other side of filter is connected by the import of pipeline and heat conduction oil circulating pump
It connects, the outlet of heat conduction oil circulating pump is connect by pipeline with heat transfer oil flow control valve, the other side of heat transfer oil flow control valve
It is connect by pipeline with heat collector import security valve, the other side of heat collector import security valve passes through pipeline and groove type heat collector
Import connection, the outlet of groove type heat collector are connect by pipeline with heat collector outlet relief valve, heat collector outlet relief valve it is another
Side is connected by pipeline with the conduction oil side-entrance of conduction oil and water- to-water heat exchanger.
Cooling cycle part include cooling water tank, cooling water filter, cooling water circulating pump, cooling water flow control valve and
Connecting line.The top of the cooling water tank of cooling cycle part is exchanged heat by pipeline with the conduction oil and water of conduction oil cyclic part
The water side outlet of device connects, and the bottom of cooling water tank is connect by pipeline with cooling water filter, cooling water filter it is another
Side is connected by the import of pipeline and cooling water circulating pump, and the outlet of cooling water circulating pump is controlled by pipeline and cooling water flow
The other side of valve connection, cooling water flow control valve is connect by pipeline with the water side-entrance of conduction oil and water- to-water heat exchanger.
Nitrogen-sealed part includes conduction oil expanded by heating tank, nitrogen breather valve, nitrogen cylinder.Nitrogen-sealed part it is thermally conductive
The bottom of oily expanded by heating tank is connected by pipeline with the conduction oil of conduction oil cyclic part and the top of water- to-water heat exchanger, conduction oil
The top of expanded by heating tank is connect by pipeline with nitrogen breather valve, and the other side of nitrogen breather valve is connected by pipeline and nitrogen cylinder
It connects.
Measuring instrument part includes flowmeter, heat collector inlet temperature sensor and accordingly heat preservation reflecting layer, heat collector go out
Mouth temperature sensor and accordingly heat preservation reflecting layer, anemobiagraph, pyrheliometer and sun tracker and ambient air temperature sensing
Device.Flowmeter is mounted on the pipeline between the heat transfer oil flow control valve of conduction oil cyclic part and heat collector import security valve
On, heat collector inlet temperature sensor is mounted on to be added close on the pipeline in the import 1m of groove type heat collector and on this section of pipeline
Dress heat preservation reflecting layer, heat collector outlet temperature sensor are mounted on close on the pipeline in the outlet 1m of groove type heat collector and at this
Install heat preservation reflecting layer on Duan Guanlu additional, anemobiagraph, pyrheliometer and sun tracker and air temperature sensor are all pacified
Place near groove type heat collector.
The course of work of apparatus of the present invention is as follows:
Conduction oil is flowed out from the conduction oil of measuring device and the bottom of water- to-water heat exchanger by pipeline, by connecting with the pipeline
The filter connect enters circulating pump, and the conduction oil flowed out from the circulating pump is by flow regulating and controlling valve, using heat collector
Import security valve enters groove type heat collector, then flow back into the conduction oil and water by heat collector outlet relief valve and exchanges heat
Device.Conduction oil expanded by heating tank is connected at the top of the conduction oil and water- to-water heat exchanger, the bottom of the expansion drum is to lead
Hot oil, top are high pressure nitrogen, and the size of nitrogen pressure passes in and out pressure value by setting nitrogen breather valve and adjusts, and by connection nitrogen
The nitrogen cylinder of gas breather valve provides source nitrogen.Cooling water is flowed out by cooling water tank, enters cooling water circulating pump, root via filter
According to the requirement setting cooling water flow control valve of amount of cooling water to allow cooling water to enter conduction oil and water- to-water heat exchanger, by heat transfer process
The cooling water tank is flowed back to after taking away heat；Heat-conducting oil pipes between flow regulating and controlling valve and heat collector import security valve
Road installation flowmeter, for measuring the volume flow of the conduction oil flowed through, close to the place in groove type heat collector import 1m
Heat collector inlet temperature sensor is installed, for measuring heat-transfer fluid inlet temperature.The heat collector inlet temperature is passed
Sensor and its neighbouring pipeline outer wall installation heat preservation reflecting layer, are broken caused by projecting because of optically focused with guaranteeing measurement accuracy and avoiding
It is bad, close to the place installation heat collector outlet temperature sensor in the groove type heat collector outlet 1m, it is used to measure heat transfer
Fluid outlet temperature.Reflecting layer is kept the temperature for the heat collector outlet temperature sensor and its installation of neighbouring pipeline outer wall, with
Guarantee measurement accuracy and avoids destruction caused by projecting because of optically focused.Anemobiagraph is installed to be used near the groove type heat collector
Measure ambient air velocity, install pyrheliometer and sun tracker for measure sun normal direction direct projection irradiation level (DNI) and
Installation environment air temperature sensor is for measuring ambient air temperature.
Measurement method of the present invention based on the heat transfer fluid exit temperature ramp de under groove type heat collector tracing collection operating condition,
Measurement obtains heat-transfer fluid inlet temperature, heat transfer fluid exit temperature, the volume flow of heat-transfer fluid, sun normal direction direct projection irradiation
The physical quantitys such as degree, ambient air temperature and ambient air velocity, the letter such as physical quantity and solar incident angle further according to these measurements
Breath, calculates the thermal efficiency of groove type heat collector.
Steps are as follows for measurement method of the invention:
The flute profile reflector surface of cleaning groove type heat collector and the glass transmission vestlet of vacuum tube type absorbing pipe are answered before measurement
Surface.To guarantee system safety, it is ensured that heat collector import security valve and heat collector outlet relief valve being capable of normal works before measurement
Make；
1, heat conduction oil circulating pump is opened, so that conduction oil flows through the groove type heat collector.The flow needed according to measurement
Flow regulating and controlling valve is set；
2, open cooling water circulating pump, cooling water enters conduction oil and water- to-water heat exchanger, cooling water take away flow back to after heat it is cold
But water tank, so that conduction oil is close to environment temperature or the specific temperature of needs；
3, it opens groove type heat collector and has tracking system by oneself, be at tracing collection state.Due to conduction oil expanded by heating,
Part conduction oil enters expansion drum, and the lower part of the expansion drum is conduction oil, and top is high pressure nitrogen, setting nitrogen breather valve
Pressure value is passed in and out, the size of nitrogen pressure is adjusted；
4, according to the requirement of conduction oil cyclic part amount of cooling water, cooling water flow control valve is adjusted, to guarantee slot type thermal-arrest
During device heating measurement, heat-transfer fluid inlet temperature climbing speed should be not more than 1.5 DEG C/min；
5, it measures and records the volume flow of the conduction oil by flowmeter measurement, measured by heat collector inlet temperature sensor
Heat-transfer fluid inlet temperature, measured by heat collector outlet temperature sensor heat transfer fluid exit temperature, measured by anemobiagraph
Ambient air velocity, the ambient air temperature that is measured by air temperature sensor, and by pyrheliometer and the sun
The sun normal direction direct projection irradiation level of tracker measurement；
6, when the heat transfer fluid exit temperature reaches the upper limit of groove type heat collector operating temperature range, stop to slot
The tracking of formula heat collector simultaneously returns to safe standby state, is measured 1 time.The time interval of all continuous measurement data should be little
In 5s, the total time effectively measured should be not less than 2h, and being measured number should be not less than 3 time；
7, the Physical Quantity Calculation paraboloid trough type solar heat-collector thermal efficiency obtained by step 5, the method is as follows:
In view of groove type heat collector cosine losses caused by the non-normal incidence of sunray in measurement process, slot type thermal-arrest
Direct solar irradiance in device daylighting plane is defined as:
Gbp=GDN cos(θ) (1)
In formula:
GDNThe sun normal direction direct projection irradiation level (DNI) of measurement, W/m2；θ incidence angle, i.e. direct sunlight line are adopted with heat collector
The angle formed between optical plane normal.
If it is considered that the blade-end loss of groove type heat collector, then the groove type heat collector daylighting plane that removal blade-end loss influences
On direct solar irradiance are as follows:
In formula:
The paraboloidal focal length of f groove type heat collector, unit: the length of m, L groove type heat collector, unit: m.
In addition, the available power of groove type heat collector output are as follows:
In formula:
cfThe heat-transfer fluid specific heat of heat collector is flowed through, unit: J/ (kg DEG C), ρ heat-transfer fluid density, unit: kg/m3,
The heat-transfer fluid volume flow of measurement, unit: m3/ s, teThe heat transfer fluid exit temperature of measurement, unit: DEG C, tiThe heat transfer of measurement
Fluid inlet temperature, unit: DEG C.
Due to measuring the heat collector inlet temperature t of obtained heat-transfer fluid simultaneouslyiWith outlet temperature teIn formula (3)
The two parameters are not corresponding in time, therefore correct the respective function relationship of the two parameters are as follows:
te(τi+τp)=F [ti(τi)] (4)
In formula:
τiHeat-transfer fluid inlet temperature measurement record time, unit: s, τpStream of the heat-transfer fluid from heat collector import to outlet
Dynamic time, unit: s.
In conclusion the paraboloid trough type solar heat-collector thermal efficiency are as follows:
In formula:
AaGroove type heat collector daylighting area, unit: m2, the τ time, unit s.
In view of the paraboloid trough type solar heat-collector thermal efficiency of blade-end loss are as follows:
In results expression, the survey of corresponding with the thermal efficiency calculated ambient air temperature and ambient air velocity is provided
Magnitude, to be clearly the paraboloid trough type solar heat-collector thermal efficiency measured under a certain specific environmental condition.
The explicit physical meaning of each parameter in measurement method of the invention, measuring device can be tracked in groove type heat collector for a long time
State realizes the continuous measurement to parameter each in measurement model, simple and easy, is suitble to field condition operating condition, to live slot type
Collector system itself control operation compatibility, cost is relatively low.
Detailed description of the invention
Fig. 1 is paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device schematic diagram.
Specific embodiment
As shown in Figure 1, paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device of the present invention is mainly by conduction oil
Cyclic part, cooling cycle part, nitrogen-sealed part and measuring instrument part composition.Conduction oil cyclic part is thermally conductive by its
Oil is imported and exported with the water side of water- to-water heat exchanger 1 to be connected with cooling cycle part, and conduction oil cyclic part passes through its conduction oil and water
The top of heat exchanger 1 passes through piping connection, measuring instrument portion with the bottom of the conduction oil expanded by heating tank 13 of nitrogen-sealed part
Each instrument is mounted on conduction oil cyclic part or its neighbouring position in point.
Conduction oil cyclic part includes conduction oil and water- to-water heat exchanger 1, filter 2, heat conduction oil circulating pump 3, heat transfer oil flow
Control valve 4, heat collector import security valve 6, groove type heat collector 9, heat collector outlet relief valve 12 and connecting line.Conduction oil and water
The conduction oil side outlet of heat exchanger 1 is connect by pipeline with filter 2, and the other side of filter 2 is followed by pipeline and conduction oil
The import connection of ring pump 3, the outlet of heat conduction oil circulating pump 3 are connect by pipeline with heat transfer oil flow control valve 4, heat transfer oil flow
The other side of control valve 4 is connect by pipeline with heat collector import security valve 6, and the other side of heat collector import security valve 6 passes through
Pipeline is connect with the import of groove type heat collector 9, and the outlet of groove type heat collector 9 is connected by pipeline and heat collector outlet relief valve 12
It connects, the other side of heat collector outlet relief valve 12 is connect with conduction oil with the conduction oil side-entrance of water- to-water heat exchanger 1 by pipeline.
Cooling cycle part includes cooling water tank 16, cooling water filter 17, cooling water circulating pump 18, cooling water flow control
Valve 19 and connecting line processed.The top of the cooling water tank 16 of cooling cycle part passes through pipeline and conduction oil and water- to-water heat exchanger 1
The connection of water side outlet, the bottom of cooling water tank 16 are connect by pipeline with cooling water filter 17, cooling water filter 17 it is another
Side is connect by pipeline with the import of cooling water circulating pump 18, and the outlet of cooling water circulating pump 18 passes through pipeline and cooling water flow
Control valve 19 connects, the other side of cooling water flow control valve 19 by the water side of pipeline and conduction oil and water- to-water heat exchanger 1 into
Mouth connection.
Nitrogen-sealed part includes conduction oil expanded by heating tank 13, nitrogen breather valve 14, nitrogen cylinder 15.Nitrogen-sealed part
The bottom of conduction oil expanded by heating tank 13 connect with the top of water- to-water heat exchanger 1 with conduction oil by pipeline, conduction oil is heated swollen
The top of swell 13 is connect by pipeline with nitrogen breather valve 14, and the other side of nitrogen breather valve 14 passes through pipeline and nitrogen cylinder 15
Connection.
Measuring instrument part includes flowmeter 5, heat collector inlet temperature sensor 8 and corresponding heat preservation reflecting layer 7, heat collector
Outlet temperature sensor 11 and corresponding heat preservation reflecting layer 10, anemobiagraph 20, pyrheliometer and sun tracker 21 and environment are empty
Gas temperature sensor 22.Flowmeter 5 is mounted on the pipeline between heat transfer oil flow control valve 4 and heat collector import security valve 6,
Heat collector inlet temperature sensor 8 is mounted on to be added close on the pipeline in the import 1m of groove type heat collector 9 and on this section of pipeline
Dress heat preservation reflecting layer 7, heat collector outlet temperature sensor 11 are mounted on close on the pipeline in the outlet 1m of groove type heat collector 9 simultaneously
Install heat preservation reflecting layer 10, anemobiagraph 20, pyrheliometer and sun tracker 21 and ambient air temperature additional on this section of pipeline
Sensor 22 is all mounted on the place near groove type heat collector 9.
To guarantee the accuracy of heat-transfer fluid inlet temperature and the measurement of heat transfer fluid exit temperature and avoiding projecting because of optically focused
Caused destruction, for heat collector inlet temperature sensor 8 and its pipeline outer wall installation nearby keeps the temperature reflecting layer 7 and for thermal-arrest
Device outlet temperature sensor 11 and its heat preservation of pipeline outer wall installation nearby reflecting layer 10, the heat preservation reflecting layer are first using anti-
Heat-barrier material package temperature sensor and its neighbouring pipeline are fired, then wraps up again on it and is greater than 0.7 with optical reflectivity
Soft material.
Steps are as follows for measurement method of the invention:
The flute profile reflector surface of cleaning groove type heat collector 9 and the glass transmission vestlet of vacuum tube type absorbing pipe are answered before measurement
Surface.To guarantee system safety, it is ensured that heat collector import security valve 6 and heat collector outlet relief valve 12 can be normal before measurement
Work.
1, heat conduction oil circulating pump 3 is opened, so that conduction oil flows through the groove type heat collector.The flow needed according to measurement
Flow regulating and controlling valve 4 is set；
2, cooling water circulating pump 18 is opened, allows cooling water to enter conduction oil and water- to-water heat exchanger 1, cooling water flows after taking away heat
Cooling water tank 16 is returned, makes conduction oil close to environment temperature or the specific temperature of needs；
3, it opens groove type heat collector and has tracking system by oneself, be at tracing collection state.Due to conduction oil expanded by heating,
Part conduction oil enters expansion drum 13, and the lower part of the expansion drum 13 is conduction oil, and top is high pressure nitrogen, by setting nitrogen
The disengaging pressure value of breather valve 14 adjusts the size of nitrogen pressure, and provides nitrogen by the nitrogen cylinder 15 of connection nitrogen breather valve 14
Source；
4, cooling water flow control valve 19 is adjusted according to the requirement of conduction oil cyclic part amount of cooling water, to guarantee slot type thermal-arrest
During device heating measurement, heat-transfer fluid inlet temperature climbing speed should be not more than 1.5 DEG C/min；
5, it measures and records the volume flow of the conduction oil measured by flowmeter 5, surveyed by heat collector inlet temperature sensor 8
The heat-transfer fluid inlet temperature of amount, the heat transfer fluid exit temperature measured by heat collector outlet temperature sensor 11, by anemobiagraph
The ambient air velocity of 20 measurements, the ambient air temperature measured by air temperature sensor 22 and by pyrheliometer and
The sun normal direction direct projection irradiation level that sun tracker 21 measures；
6, when the heat transfer fluid exit temperature reaches the upper limit of groove type heat collector operating temperature range, stop to slot
The tracking of formula heat collector simultaneously returns to safe standby state, is measured 1 time.The time interval of all continuous measurement data should be little
In 5s, the total time effectively measured should be not less than 2h, and being measured number should be not less than 3 time；
7, the Physical Quantity Calculation paraboloid trough type solar heat-collector thermal efficiency is obtained, the method is as follows:
In view of groove type heat collector cosine losses caused by the non-normal incidence of sunray in measurement process, slot type thermal-arrest
Direct solar irradiance in device daylighting plane is defined as:
Gbp=GDN cos(θ) (1)
In formula:
GDNThe sun normal direction direct projection irradiation level (DNI) of measurement, W/m2；θ incidence angle, i.e. direct sunlight line are adopted with heat collector
The angle formed between optical plane normal, unit are °.
If it is considered that the blade-end loss of groove type heat collector, then the groove type heat collector daylighting plane that removal blade-end loss influences
On direct solar irradiance are as follows:
In formula:
The paraboloidal focal length of f groove type heat collector, unit m；The length of L groove type heat collector, unit m.
In addition, the available power of groove type heat collector output are as follows:
In formula:
cfThe heat-transfer fluid specific heat of heat collector is flowed through, unit: J/ (kg DEG C), ρ heat-transfer fluid density, unit: kg/m3,
The heat-transfer fluid volume flow of measurement, unit: m3/ s, teThe heat transfer fluid exit temperature of measurement, unit: DEG C, tiThe heat transfer of measurement
Fluid inlet temperature, unit: DEG C.
Due to measuring the heat collector inlet temperature t of obtained heat-transfer fluid simultaneouslyiWith outlet temperature teIn formula (3)
The two parameters are not corresponding in time, therefore correct the respective function relationship of the two parameters are as follows:
te(τi+τp)=F [ti(τi)] (4)
In formula:
τiHeat-transfer fluid inlet temperature measurement record time, unit: s, τpStream of the heat-transfer fluid from heat collector import to outlet
Dynamic time, unit: s.
In conclusion the paraboloid trough type solar heat-collector thermal efficiency are as follows:
In formula:
AaGroove type heat collector daylighting area, unit: m2, the τ time, unit: s.
In view of the paraboloid trough type solar heat-collector thermal efficiency of blade-end loss are as follows:
In results expression, the survey of corresponding with the thermal efficiency calculated ambient air temperature and ambient air velocity is provided
Magnitude, to be clearly the paraboloid trough type solar heat-collector thermal efficiency measured under a certain specific environmental condition.
Claims (2)
1. a kind of paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device, it is characterized in that: the measuring device packet
Include conduction oil cyclic part, cooling cycle part, nitrogen-sealed part and measuring instrument part；Conduction oil cyclic part passes through it
Conduction oil is imported and exported with the water side of water- to-water heat exchanger (1) to be connected with cooling cycle part, and conduction oil cyclic part is thermally conductive by its
Oil and the top of water- to-water heat exchanger (1) pass through piping connection with the bottom of the conduction oil expanded by heating tank (13) of nitrogen-sealed part,
Measuring instrument is partially installed on conduction oil cyclic part or its neighbouring position；
The conduction oil cyclic part include conduction oil with water- to-water heat exchanger (1), filter (2), heat conduction oil circulating pump (3), lead
Hot oil flow control valve (4), heat collector import security valve (6), groove type heat collector (9), heat collector outlet relief valve (12) and company
Take over road；Conduction oil and the conduction oil side outlet of water- to-water heat exchanger (1) are connect by pipeline with filter (2), filter (2) it is another
Side is connect by pipeline with the import of heat conduction oil circulating pump (3), and the outlet of heat conduction oil circulating pump (3) passes through pipeline and conduction oil
The other side of flow control valve (4) connection, heat transfer oil flow control valve (4) is connected by pipeline and heat collector import security valve (6)
It connects, the other side of heat collector import security valve (6) is connect by pipeline with the import of groove type heat collector (9), groove type heat collector (9)
Outlet connect with heat collector outlet relief valve (12) by pipeline, the other side of heat collector outlet relief valve (12) passes through pipeline
It is connect with conduction oil with the conduction oil side-entrance of water- to-water heat exchanger (1)；
The measuring instrument part includes the flowmeter (5) being mounted on the conduction oil cyclic part, heat collector import
It temperature sensor (8) and accordingly keeps the temperature reflecting layer (7), heat collector outlet temperature sensor (11) and accordingly keep the temperature reflecting layer
(10), anemobiagraph (20), pyrheliometer and the sun tracker (21) and environment sky and in groove type heat collector (9) nearby installed
Gas temperature sensor (22)；Flowmeter (5) is mounted between heat transfer oil flow control valve (4) and heat collector import security valve (6)
Pipeline on, heat collector inlet temperature sensor (8) is mounted on close on the pipeline in the import 1m of groove type heat collector (9), should
Install the first heat preservation reflecting layer (7) on Duan Guanlu additional, heat collector outlet temperature sensor (11) is mounted on close to groove type heat collector (9)
Outlet 1m in pipeline on, on this section of pipeline install additional second heat preservation reflecting layer (10)；Anemobiagraph (20), pyrheliometer and too
Positive tracker (21) and air temperature sensor (22) are mounted near groove type heat collector (9)；
First heat preservation reflecting layer (7) and the second heat preservation reflecting layer (10) is first to wrap up temperature using anti-flaming heat-barrier material to pass
Then sensor and its neighbouring pipeline wrap up the soft material that optical reflectivity is greater than 0.7 on it again.
2. using the measurement method of paraboloid trough type solar heat-collector thermal efficiency dynamic measurement device described in claim 1,
It is characterized in that: the measurement method was risen based on the heat transfer fluid exit temperature under groove type heat collector tracing collection operating condition
Journey, measurement obtain heat-transfer fluid inlet temperature, heat transfer fluid exit temperature, the volume flow of heat-transfer fluid, sun normal direction direct projection
Irradiation level, ambient air temperature and ambient air velocity calculate groove type heat collector further according to these physical quantitys and solar incident angle
The thermal efficiency, steps are as follows:
1) heat conduction oil circulating pump (3) are opened, conduction oil is made to flow through the groove type heat collector (9)；It is measured according to flowmeter (5)
Heat transfer oil flow control valve (4) are adjusted to flow；
2) cooling water circulating pump (18) are opened, cooling water enters conduction oil and water- to-water heat exchanger (1), and cooling water flows back to after taking away heat
Cooling water tank (16) makes conduction oil close to environment temperature or the specific temperature of needs；
3) it opens groove type heat collector and has tracking system by oneself, be at tracing collection state；Due to conduction oil expanded by heating, part
Conduction oil enters expansion drum (13), and the lower part of the expansion drum (13) is conduction oil, and top is high pressure nitrogen, by setting nitrogen
The disengaging pressure value of breather valve (14) adjusts the size of nitrogen pressure, and is mentioned by the nitrogen cylinder (15) of connection nitrogen breather valve (14)
For source nitrogen；
4) cooling water flow control valve (19) are adjusted according to the requirement of conduction oil cyclic part amount of cooling water, to guarantee groove type heat collector
During heating measurement, heat-transfer fluid inlet temperature climbing speed should be not more than 1.5 DEG C/min；
5) it measures and records the volume flow of the conduction oil by flowmeter (5) measurement, surveyed by heat collector inlet temperature sensor (8)
The heat-transfer fluid inlet temperature of amount, by heat collector outlet temperature sensor (11) measurement heat transfer fluid exit temperature, by wind speed
The ambient air velocity of instrument (20) measurement, the ambient air temperature measured by air temperature sensor (22), and by straight
Connect the sun normal direction direct projection irradiation level of actinometer and sun tracker (21) measurement；
6) when the heat transfer fluid exit temperature reaches the upper limit of groove type heat collector operating temperature range, stop to slot type collection
The tracking of hot device, and safe standby state is returned, it is measured 1 time；The time interval of all continuous measurement data should be not more than
5s, the total time effectively measured are not less than 2h, are measured number not less than 3 times；
7) the obtained Physical Quantity Calculation paraboloid trough type solar heat-collector thermal efficiency is measured by step 5, the method is as follows:
In view of groove type heat collector cosine losses, groove type heat collector caused by the non-normal incidence of sunray in measurement process are adopted
Direct solar irradiance on optical plane is defined as:
Gbp=GDN cos(θ) (1)
In formula:
GDNThe sun normal direction direct projection irradiation level of measurement, unit: W/m2, θ incidence angle, i.e. direct sunlight line and heat collector daylighting are flat
The angle formed between the normal of face, unit °；
If it is considered that the blade-end loss of groove type heat collector, then in the groove type heat collector daylighting plane that removal blade-end loss influences
Direct solar irradiance are as follows:
In formula:
The paraboloidal focal length of f groove type heat collector, unit: the length of m, L groove type heat collector, unit: m；
In addition, the available power of groove type heat collector output are as follows:
In formula:
cfThe heat-transfer fluid specific heat of heat collector is flowed through, unit: J/ (kg DEG C), ρ heat-transfer fluid density, unit: kg/m3,Measurement
Heat-transfer fluid volume flow, unit: m3/ s, teThe heat transfer fluid exit temperature of measurement, unit: DEG C, tiThe heat-transfer fluid of measurement
Inlet temperature, unit: DEG C；
Due to measuring the heat collector inlet temperature t of obtained heat-transfer fluid simultaneouslyiWith outlet temperature teWith in formula (3) this two
A parameter is not corresponding in time, therefore corrects the respective function relationship of the two parameters are as follows:
te(τi+τp)=F [ti(τi)] (4)
In formula:
τiHeat-transfer fluid inlet temperature measurement record time, unit: s, τpWhen flowing of the heat-transfer fluid from heat collector import to outlet
Between, unit: s；
In conclusion the paraboloid trough type solar heat-collector thermal efficiency are as follows:
In formula: AaGroove type heat collector daylighting area, unit: m2, the τ time, unit: s；
In view of the paraboloid trough type solar heat-collector thermal efficiency of blade-end loss are as follows:
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