CN104180929A - Calibration method of thermal resistance type hot-fluid sensor - Google Patents
Calibration method of thermal resistance type hot-fluid sensor Download PDFInfo
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- CN104180929A CN104180929A CN201410384568.8A CN201410384568A CN104180929A CN 104180929 A CN104180929 A CN 104180929A CN 201410384568 A CN201410384568 A CN 201410384568A CN 104180929 A CN104180929 A CN 104180929A
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Abstract
Disclosed is a calibration method of a thermal resistance type hot-fluid sensor. The method comprises the following steps: a), arranging a heat conduction flat plate; b), respectively symmetrically installing a plurality of hot-fluid sensors and temperature sensors at the two sides of the heat conduction flat plate; c), each hot-fluid sensor respectively sending an acquired hot-fluid value q1, a hot surface temperature t0 and a hot surface temperature t1 to a hot-fluid-temperature inspection tour instrument; d), the hot-fluid-temperature inspection tour instrument calculating a standard hot-fluid value q0 according to a formula shown in the descriptions; e), according to a formula C=q0/q1, calculating a hot-fluid value correction coefficient C; and f), when an error between the hot-fluid value correction coefficients C for N continuous times does not exceed 1%, calculating an average value C<->of N correction coefficients C, and taking the average value as a final hot-fluid value correction coefficient for writing into the configuration file of the hot-fluid-temperature inspection tour instrument. According to the invention, a calibration result is accurate, the precision is high, the convenience and feasibility are high, the problem of incapability of accurately calibrating a hot-fluid instrument in building thermal operation detection is effectively solved, and the experiment efficiency and the reliability are improved.
Description
Technical field
The present invention relates to a kind of calibration steps of TR heat flux sensor, be specifically related to the calibration steps of the TR heat flux sensor of the absolute non-calibration heat flux sensor of a kind of basis.
Background technology
Heat flux sensor is to measure the basic tool that heat is transmitted (heat flow density or thermoflux), is the most critical device that forms heat flow meter, and the accuracy of its measurement result is the most critical factor that determines the accuracy of heat flow meter measurement result.The developing history of hot-fluid calibration (or demarcation) technology is not long.Not yet setting up in the world at present can be for the standard of hot-fluid on a large scale of comparison, and some departments that are engaged in heat flux sensor research, manufacture, according to the scaling method that the feature of product is formulated separately, difference due to principle and transmission procedure, exist to each other the difference of system, data can not match conventionally.Current carry out at home the work of heat flow meter calibrating and measuring only have China national metering institute, China Constrution Academe and space flight 102 etc. a few unit, carry out Project Unit to make less comparison test be difficult to effectively carry out, lack careful active data.So, carry out the research work to the calibration of heat flow meter, for the detection of heat energy energy consumption and scientific research, there is very important meaning.
TR heat flux sensor is current conventional heat flux sensor, and large multiplex rubber is made, and its thickness is 3 mm, and synthetic resin material and plating thermoelectric pile, and the error causing is all higher.Because the calibration result of heat flux sensor is subject to the impact of calibration facility and external environment very large, as thickness, the length of side and the pressured state etc. of the radiance of the temperature of environment, wind speed, environment and sensor itself, therefore to calibration operation, brought certain difficulty.So far, also there is no the hot-fluid detecting instrument of standard both at home and abroad, there is no a kind of calibration steps of simple and effective heat flux sensor yet.
Summary of the invention
The present invention, in order to overcome the deficiency of above technology, provides the calibration steps of the TR heat flux sensor that a kind of calibration result is accurate, precision is high, easy to use.
The present invention overcomes the technical scheme that its technical matters adopts:
The calibration steps of this TR heat flux sensor, comprises the steps
A) between ice chest and hot case, heat conduction flat board is set, the flow guiding screen that makes heat conduction planar surface form convection current is set respectively in ice chest and hot case, the fin type heat exchanger in ice chest is connected in handpiece Water Chilling Units, in hot case, is provided with electric heater;
B) symmetrical some heat flux sensors and the temperature sensor installed respectively in the dull and stereotyped both sides of heat conduction, will each heat flux sensor and temperature sensor numbering after be connected in hot-fluid-temperature polling instrument;
C), in ice chest, hot case work after 4-8 hour, each heat flux sensor is by the heat flow value gathering
and the dull and stereotyped huyashi-chuuka (cold chinese-style noodles) temperature of heat conduction that measures of heat flux sensor and temperature sensor or temperature sensor and heat flux sensor
with the dull and stereotyped hot-face temperature of heat conduction
be sent to respectively hot-fluid-temperature polling instrument;
D) hot-fluid-temperature polling instrument is according to formula
calculate standard heat flow value
, in formula
for the coefficient of heat conductivity of the material of heat conduction flat board,
thickness for heat conduction flat board;
E) according to formula
calculate heat flow value correction factor C;
F) repeating step c) to e), until the error between N continuous time heat flow value correction factor C while being no more than 1%, is calculated the mean value of N correction factor C
, and using it as final heat flow value correction factor, writing the configuration file of hot-fluid-temperature polling instrument, hot-fluid-temperature polling instrument is according in configuration file
all heat flux sensors are proofreaied and correct, and it obtains revised heat flow value.
In order realizing, the sensitivity of heat flux sensor to be revised, to be also included in step e) after utilize hot-fluid-temperature polling instrument according to formula
calculate heat flux sensor sensitivity amendment coefficient
, in formula
for the predefined sensitivity coefficient of heat flux sensor, the heat flux sensor sensitivity amendment coefficient calculating
the configuration file that writes hot-fluid-temperature polling instrument is revised the sensitivity of heat flux sensor.
In order to raise the efficiency under the prerequisite of precision guaranteeing, above-mentioned steps f) the N value in is 4.
In order to check calibration result, above-mentioned steps f) be finished after, keep test environment constant, each heat flux sensor is by the heat flow value of multi collect
be sent to hot-fluid-temperature polling instrument, hot-fluid-temperature polling instrument gathers heat flux sensor after revising
with standard heat flow value
compare.
In order to improve measuring accuracy, above-mentioned heat conduction flat board is polystyrene board.
In order accurately to control and to add heat, above-mentioned electric heater adds heat by being connected in pid control module adjustment.
Each heat flux sensor is connected with the wireless senser communicating terminal of corresponding numbering respectively with temperature sensor, and it is sent to hot-fluid-temperature polling instrument by wireless senser communicating terminal by image data separately.
In order to reduce hot-fluid loss, above-mentioned steps b) in heat flux sensor be arranged near on the heat conduction flat board of hot case one side, temperature sensor is arranged near on the heat conduction flat board of ice chest one side.
The invention has the beneficial effects as follows: by a plurality of heat flux sensors and temperature sensor, gather heat flow data and temperature data, by hot-fluid-temperature polling instrument, calculate correction factor, can calibrate accurately and easily building heat flow appearance, calibration error is less than 2%.By experiment with the practical application of certain scale, calibration result is accurate, precision is high, facilitate feasible, efficiently solve the problem that building thermal technique cannot Accurate Calibration hot-fluid instrument in detecting, conventional efficient and reliability have been improved, for heat flux sensor manufacturer provides good heat flux sensor calibration steps.And hot-fluid-temperature polling instrument can be calibrated all heat flux sensors that are arranged on heat conduction flat board in the method simultaneously, can carry out batch and demarcate, for future the upgrading of device and further research being provided convenience.
Accompanying drawing explanation
Fig. 1 is the comparative graph of heat flow value, standard heat flow value and the revised heat flow value of collection;
Fig. 2 is the error before revising and the error comparison diagram of revised heat flow value; .
Embodiment
Below in conjunction with accompanying drawing 1, the present invention will be further described for accompanying drawing 2.
The calibration steps of this TR heat flux sensor, comprises the steps
(1) between ice chest and hot case, heat conduction flat board is set, the flow guiding screen that makes heat conduction planar surface form convection current is set respectively in ice chest and hot case, the fin type heat exchanger in ice chest is connected in handpiece Water Chilling Units, in hot case, is provided with electric heater.(2) symmetrical some heat flux sensors and the temperature sensor installed respectively in the dull and stereotyped both sides of heat conduction, will each heat flux sensor and temperature sensor numbering after be connected in hot-fluid-temperature polling instrument.(3), in ice chest, hot case work after 4-8 hour, each heat flux sensor is by the heat flow value gathering
and the dull and stereotyped huyashi-chuuka (cold chinese-style noodles) temperature of heat conduction that measures of heat flux sensor and temperature sensor or temperature sensor and heat flux sensor
with the dull and stereotyped hot-face temperature of heat conduction
be sent to respectively hot-fluid-temperature polling instrument.(4) hot-fluid-temperature polling instrument is according to formula
calculate standard heat flow value
, in formula
for the coefficient of heat conductivity of the material of heat conduction flat board,
thickness for heat conduction flat board.(5) according to formula
calculate heat flow value correction factor C.(6) repeating step (4) is to (5), until the error between N continuous time heat flow value correction factor C while being no more than 1%, is calculated the mean value of N correction factor C
, and using it as final heat flow value correction factor, writing the configuration file of hot-fluid-temperature polling instrument, hot-fluid-temperature polling instrument is according in configuration file
all heat flux sensors are proofreaied and correct, and it obtains revised heat flow value.By a plurality of heat flux sensors and temperature sensor, gather heat flow data and temperature data, by hot-fluid-temperature polling instrument, calculate correction factor, can calibrate accurately and easily building heat flow appearance, calibration error is less than 2%.By experiment with the practical application of certain scale, calibration result is accurate, precision is high, facilitate feasible, efficiently solve the problem that building thermal technique cannot Accurate Calibration hot-fluid instrument in detecting, conventional efficient and reliability have been improved, for heat flux sensor manufacturer provides good heat flux sensor calibration steps.And hot-fluid-temperature polling instrument can be calibrated all heat flux sensors that are arranged on heat conduction flat board in the method simultaneously, can carry out batch and demarcate, for future the upgrading of device and further research being provided convenience.
After being also included in step (5), utilize hot-fluid-temperature polling instrument according to formula
calculate heat flux sensor sensitivity amendment coefficient
, in formula
for the predefined sensitivity coefficient of heat flux sensor, the heat flux sensor sensitivity amendment coefficient calculating
the configuration file that writes hot-fluid-temperature polling instrument is revised the sensitivity of heat flux sensor.By the temperature heat flow data gathering, heat flux sensor is carried out to sensitivity amendment, possess correction factor and calculate accurately, revise the high feature of precision, further improved the correction accuracy of heat flux sensor.
N value in step (6) is 4.If be less than 4, can cause the too small computational accuracy that causes of sample number low, if be greater than 4 phenomenons that will cause computational data too much to cause wasting internal memory, therefore pass through reasonable value, in the situation that guaranteeing computational accuracy, improved the execution efficiency of hot-fluid-temperature polling instrument.
After above-mentioned steps (6) is finished, keep test environment constant, each heat flux sensor is by the heat flow value of multi collect
be sent to hot-fluid-temperature polling instrument, hot-fluid-temperature polling instrument gathers heat flux sensor after revising
with standard heat flow value
compare.Shown in accompanying drawing 1 and accompanying drawing 2, can obtain drawing a conclusion:
(1) from accompanying drawing 1, standard heat flow value amplitude of variation is little, and the heat flow value amplitude of variation gathering is less than 0.37, and cold and hot the temperature inside the box tends towards stability and evenly, meets requirement of experiment at that time as seen.Before calibration, the heat flow value of collection and standard heat flow value differ greatly, and after calibration, revised heat flow value is obviously tending towards standard heat flow value.
(2) from accompanying drawing 2, from revising, can find out with revised Error Trend curve, the error before correction is in 6%, and revised error is lower than 2%, and calibration result is accurate, and error belongs in tolerance interval.
By hot-fluid-temperature polling instrument, heat flux sensor after revising is gathered
with standard heat flow value
compare and can check calibration result whether accurate, improved the reliability of the calibration steps of this TR heat flux sensor.
Heat conduction flat board can be polystyrene board.Polystyrene board good heat conductivity, cold and hot surface temperature fluctuation is little, therefore can effectively improve measuring accuracy.Electric heater can add heat by being connected in pid control module adjustment, has further improved the accurate control to hot case heating-up temperature, has improved measuring accuracy.
Each heat flux sensor is connected with the wireless senser communicating terminal of corresponding numbering respectively with temperature sensor, and it is sent to hot-fluid-temperature polling instrument by wireless senser communicating terminal by image data separately.Because each heat flux sensor is connected with corresponding wireless senser communicating terminal by unique numbering with temperature sensor, therefore hot-fluid-temperature polling instrument can be identified hot-fluid and the temperature data of each terminal automatically, and can, with wireless outgoi8ng data file, so just can calibrate a plurality of heat flux sensors simultaneously.The method is measured by wireless sensing net mode under the identical test environment of maintenance, relatively stable, has reduced experimental work amount.
Heat flux sensor can detect hot-fluid and temperature simultaneously, and it is hot-fluid-temperature compound transducer in fact, so heat flux sensor is installed in a wherein side of the dull and stereotyped both sides of heat conduction, opposite side mounting temperature sensor, so just can obtain the temperature difference of both sides.Only in a side, heat flux sensor is installed, be with reference to < < Residential Buildings Energy examination criteria > > (JGJ/T132-2009), in enclosed structure building thermal technique performance Site Detection, just only need to detect heat flow density at indoor location heat flow meter.Step b) heat flux sensor in is arranged near on the heat conduction flat board of hot case one side, it is that its detection hot-fluid loss ratio is larger because if heat flux sensor is arranged on ice chest one side that temperature sensor is arranged on the close heat conduction flat board of ice chest one side, is unfavorable for accurate measurement.
Claims (8)
1. a calibration steps for TR heat flux sensor, is characterized in that: comprise the steps
A) between ice chest and hot case, heat conduction flat board is set, the flow guiding screen that makes heat conduction planar surface form convection current is set respectively in ice chest and hot case, the fin type heat exchanger in ice chest is connected in handpiece Water Chilling Units, in hot case, is provided with electric heater;
B) symmetrical some heat flux sensors and the temperature sensor installed respectively in the dull and stereotyped both sides of heat conduction, will each heat flux sensor and temperature sensor numbering after be connected in hot-fluid-temperature polling instrument;
C), in ice chest, hot case work after 4-8 hour, each heat flux sensor is by the heat flow value gathering
and the dull and stereotyped huyashi-chuuka (cold chinese-style noodles) temperature of heat conduction that measures of heat flux sensor and temperature sensor or temperature sensor and heat flux sensor
with the dull and stereotyped hot-face temperature of heat conduction
be sent to respectively hot-fluid-temperature polling instrument;
D) hot-fluid-temperature polling instrument is according to formula
calculate standard heat flow value
, in formula
for the coefficient of heat conductivity of the material of heat conduction flat board,
thickness for heat conduction flat board;
E) according to formula
calculate heat flow value correction factor C;
F) repeating step c) to e), until the error between N continuous time heat flow value correction factor C while being no more than 1%, is calculated the mean value of N correction factor C
, and using it as final heat flow value correction factor, writing the configuration file of hot-fluid-temperature polling instrument, hot-fluid-temperature polling instrument is according in configuration file
all heat flux sensors are proofreaied and correct, and it obtains revised heat flow value.
2. the calibration steps of TR heat flux sensor according to claim 1, is characterized in that: be also included in step e) after utilize hot-fluid-temperature polling instrument according to formula
calculate heat flux sensor sensitivity amendment coefficient
, in formula
for the predefined sensitivity coefficient of heat flux sensor, the heat flux sensor sensitivity amendment coefficient calculating
the configuration file that writes hot-fluid-temperature polling instrument is revised the sensitivity of heat flux sensor.
3. the calibration steps of TR heat flux sensor according to claim 1, is characterized in that: the N value in described step f) is 4.
4. the calibration steps of TR heat flux sensor according to claim 1, is characterized in that: after described step f) is finished, keep test environment constant, each heat flux sensor is by the heat flow value of multi collect
be sent to hot-fluid-temperature polling instrument, hot-fluid-temperature polling instrument gathers heat flux sensor after revising
with standard heat flow value
compare.
5. according to the calibration steps of the TR heat flux sensor described in any one in claim 1 to 4, it is characterized in that: described heat conduction is dull and stereotyped is polystyrene board.
6. according to the calibration steps of the TR heat flux sensor described in any one in claim 1 to 4, it is characterized in that: described electric heater adds heat by being connected in pid control module adjustment.
7. the calibration steps of TR heat flux sensor according to claim 1, it is characterized in that: each heat flux sensor is connected with the wireless senser communicating terminal of corresponding numbering respectively with temperature sensor, and it is sent to hot-fluid-temperature polling instrument by wireless senser communicating terminal by image data separately.
8. according to the calibration steps of the TR heat flux sensor described in claim 1 or 7, it is characterized in that: the heat flux sensor described step b) is arranged near on the heat conduction flat board of hot case one side, and temperature sensor is arranged near on the heat conduction flat board of ice chest one side.
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