CN102288642A - Concrete thermal diffusivity measurement device - Google Patents
Concrete thermal diffusivity measurement device Download PDFInfo
- Publication number
- CN102288642A CN102288642A CN2011102515672A CN201110251567A CN102288642A CN 102288642 A CN102288642 A CN 102288642A CN 2011102515672 A CN2011102515672 A CN 2011102515672A CN 201110251567 A CN201110251567 A CN 201110251567A CN 102288642 A CN102288642 A CN 102288642A
- Authority
- CN
- China
- Prior art keywords
- temperature
- small power
- water
- power electric
- circulating water
- 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.)
- Granted
Links
Images
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention provides a concrete thermal diffusivity measurement device. A constant temperature circulating water supply device is provided with two sets of large and small power electric heaters[27] and one set of small power electric cooler[26], wherein the heating power of the large power electric heater is larger than a heat amount required for heating circulating water to a constant temperature thermal diffusion environmental temperature within 5 minutes; the small power electric heater and the small power electric cooler are connected with a power control mechanism[F11, F21]in a temperature control device; and a control error from the constant temperature circulating water supply device to an environmental water temperature is smaller than 1 percent of the minimum allowable starting temperature of the measurement device. Compared with the prior art, the measurement device provided by the invention has the advantages that the environmental water temperature can be quickly increased so that the measurement of multi temperature sections is realized; the measurement can be performed at a thermal diffusion temperature point lower than the environmental temperature of the device, so that the measurement of the entire temperature section is realized; and the control precision of the environmental temperature is simultaneously increased, so that the initial temperature difference is reduced but the minimum measurement error value required by measurement standards can still be achieved.
Description
Technical field
What the present invention relates to is a kind of thermal diffusivity of concrete determinator.
Background technology
The assay method of present disclosed thermal diffusivity of concrete has two kinds, is respectively the assay method (abbreviating the SL352 method as) (SL352-2006) stipulated by People's Republic of China's water conservancy industry standard " concrete for hydraulic structure testing regulations " and is that the Chinese invention patent application " assay method of thermal diffusivity of concrete and test unit " of CN101915776 is open and be written into People's Republic of China's building trade product standard " concrete thermophysical parameter analyzer " assay method (abbreviating the BYR method as) (JG/T329-2011) by publication number.They are respectively to build the thermostatted water environment that temperature is lower or higher outside equality of temperature body test specimen, make equality of temperature body test specimen form a stable forward or reverse thermal diffusion process, thereby after handling, calculate thermal diffusivity to the mensuration of the temperature difference-time relationship at test specimen center in this thermal diffusion process and to measurement result from middle mind-set surface.Said equality of temperature body test specimen is test specimen to be placed under a certain environment temperature form when the effect of thermal diffusion makes its central temperature and surface temperature (environment temperature of living in it is identical) convergent, this moment, its central temperature and surface temperature were approaching, and were respectively two ultimate values that the temperature field distributes in the test specimen.The residing environment water temperature of test specimen will be controlled the thermostat temperature that reaches and is called the thermal diffusion environment temperature during mensuration, and the temperature of equality of temperature body test specimen and the difference of thermal diffusion environment temperature are the initial temperature differences of this mensuration.
For the assay method that is provided is provided, application for a patent for invention CN101915776 has also proposed corresponding determinator, should " test bucket, thermostatical circulating water groove and temperature control system are arranged in the determinator, and wherein equality of temperature body test specimen system device is that wherein medium temperature is chamber or a tank below 30 ℃; The thermostatical circulating water groove is for realizing measuring the hot thermostatical circulating water groove of environment, connecting into water circulation system by water pipe and water pump between test bucket and the hot thermostatical circulating water groove; Said temperature control system comprise the mensuration environment temperature sensor installed in the water circulation system and with electric heater, measure the constant temperature control circuit that the environment temperature sensor electric signal is connected, also comprise temperature-time keeping device that the temperature sensor buried underground at the test specimen center is connected with test specimen central temperature sensor electrical signal.”
The major advantage of the disclosed method and apparatus of application for a patent for invention CN101915776 be overcome traditional assay method (SL352 method) Yin Gaowen equality of temperature body test specimen the isoperibol temperature of lower temperature carry out that thermal diffusion is measured and the realization of the determinator of the thermostatical circulating water that will adopt be limited by refrigeration modes to the error control of constant temperature thermal diffusion temperature existing many be not enough to realize energy-conservation, economize on water, save time, improve measuring accuracy and target such as reduce cost.
Studies show that in the thermal diffusion process under different thermostat temperatures, concrete thermal diffusivity is different.Simultaneously, in certain temperature range in the thermal diffusion process of (10 ℃～70 ℃) thermal diffusivity and temperature can present the better linearity relation.When therefore obtaining the thermal diffusivity of degree of precision for needs, just the mensuration that need under different thermostat temperatures, repeatedly carry out thermal diffusion process is measured as repeat 3 times at 15 ℃, 30 ℃, 45 ℃, 60 ℃ 4 temperature spots, each temperature spot to obtain the thermal diffusivity characteristic of concrete application of temperature section (being generally 10 ℃～70 ℃).
But because existing two kinds of assay methods, promptly SL352 method and BYR method all require test specimen to keep the enough big start-stop temperature difference, promptly the temperature of equality of temperature body test specimen and when measuring the difference between the temperature of isoperibol want enough greatly, with the accuracy of assurance measurement result.This is because the relative error Δ α/α of the thermal diffusivity of the caused detected concrete of error delta θ of temperature difference θ is:
That is: relative error of measurement is by Δ θ/θ decision.Because: (1) test specimen center temperature difference θ reduces in time, under the constant prerequisite of Δ θ, the maximum relative error of measurement result the temperature difference is determined when stopping by measuring; (2) according to the measuring principle of assay method, for same test specimen, it is put into constant temperature thermal diffusion environment from equality of temperature body test specimen and plays that to form the required time of steady heat disperse state identical, and irrelevant with the test temperature difference; And it is also basic identical for (the shortest) duration of satisfying the required steady heat disperse state of assay method; (3) calculating of measurement result relates to the calculating of the slope of the straight-line segment that the natural logarithm curve of the center temperature difference forms under the steady heat disperse state, must have certain duration could guarantee the computational accuracy that it is enough; (4) and become to be similar to proportional relation with the Initial Temperature Difference of test for the termination temperature difference of identical its test of duration.Therefore,, then dwindle the Initial Temperature Difference of measurement, will reduce the measuring accuracy of measurement result if keep the thermometric error value and the constant temperature thermal diffusion stage water temperature departure value of the determined thermal diffusion determinator of prior art.
So the test initial temperature difference of existing two kinds of assay methods all requires more than 30 ℃.And, because above-mentioned existing two kinds of assay methods require test specimen central temperature and surface etc. all identical to the state of temperature of equality of temperature body test specimen, promptly the measured temperature under the thermometric error of prior art is identical, and the end condition of once measuring is that the center of its test specimen and the temperature difference on test specimen surface are 3 ℃～6 ℃, so the state of test specimen does not satisfy the status condition of the equality of temperature body test specimen of these two kinds of assay methods during certain determination test termination.Be difficult to after the determination test of a constant temperature thermal diffusion temperature is finished, begin immediately to carry out the mensuration of another thermostat temperature according to existing two kinds of assay methods and determinator like this and carry out the mensuration of a plurality of constant temperature thermal diffusion environment temperatures in realizing with a long run test, and can only be under different environment temperatures, to carry out test of many times respectively to measure, and can not comprise the mensuration of thermal diffusion temperature at 30 ℃～50 ℃ of temperature sections.
Deficiency at above-mentioned two kinds of methods existence, Boyuan Science ﹠ Technology Development Co. Ltd., Zhoushan City (Chinese Zhejiang) has proposed a kind of main points for " starting condition of used equality of temperature body test specimen is the test specimen center and the equally distributed equilibrium temperature gradient fields of test specimen surface formation temperature difference less than 5 ℃; the error of control Environmental Water temperature relatively hot diffusional environment temperature allows 1% of Initial Temperature Difference less than the minimum of determinator during mensuration, and the end condition of end present segment mensuration is that the temperature difference of test specimen center and thermal diffusion environment temperature is less than 0.1 θ
0～0.2 θ
0(θ
0Initial temperature differences for this mensuration), this state and the equality of temperature body test specimen condition of measuring for subsequent segment, in each temperature section test said environment water temperature by enter fast, steady heat diffuses to form, steady heat spreads three phases and controls." " thermal diffusivity of concrete multiple temperature sections assay method ".This method has realized measuring the mensuration that realizes littler Initial Temperature Difference and continuous many temperature sections under the constant condition of relative error with the control accuracy of formation condition of relaxing equality of temperature body test specimen and raising environment temperature.
But in this method, when the thermal diffusivity under doing lower temperature (referring to that the thermal diffusion environment temperature is lower than the device context temperature) is measured, use the SL352 method.Use the SL352 method to do low-temperature zone mensuration then because refrigerating efficiency limits, it is higher than the intensification power consumption to lower the temperature when the two ends temperature is identical, the energy consumption that it is lowered the temperature and temperature control need be bigger than the mode of heating; Because refrigeration response speed restriction, obtaining identical constant temperature precision need be than the more quantity of circulating water of the mode of heating, and many quantity of circulating water will more strengthen the energy consumption of refrigeration; And the realization of refrigerated constant temperature control system will be much higher than the realization cost of the mode of heating.
If only adopt the BYR method to come on any one point in whole temperature ranges, to measure thermal diffusivity then limited by minimum temperature.This is because the BYR method adopts the heated constant temperature control mode, promptly the heat energy that scatters and disappears in the mensuration process by control heating power contour compensation recirculated water is realized thermostatic control, only when the residing environment temperature of test unit is lower than constant temperature thermal diffusion temperature, temperature control equipment could be kept in the claimed range that the environment water temperature remains on the thermal diffusion temperature by the way of heating.Flowing of recirculated water also will cause heating up still more, this intensification must be offset the heat radiation of environment by test unit, could realize thermostatic control, if and the temperature of determinator environment of living in is greater than or equal to the thermal diffusion temperature, the environment water temperature when then measuring can't be kept desired constant temperature level.That is to say the thermal diffusivity that adopts the determinator that is proposed among the application for a patent for invention CN101915776 can't measure the temperature province lower than environment temperature.
In a word, thermal diffusivity of concrete determinator of the prior art, as not in conjunction with the SL352 method, can not realize full temperature section, promptly in the four corner of concrete Applicable temperature under (10 ℃～70 ℃) different thermostat temperatures, continuous several times carries out the mensuration of thermal diffusivity; And realize the deficiency that the consumption that can not avoid this method to exist is big, realize the cost costliness in conjunction with the SL352 method.。
Summary of the invention
At above-mentioned deficiency, technical matters to be solved by this invention is the thermostatical circulating water feedway that how to design in the thermal diffusivity of concrete determinator, is keeping that the BYR method is energy-conservation, can measure with the thermal diffusivity that realizes full temperature section at the constant thermal diffusivity of concrete determinator below the environment temperature of device of thermal diffusion environment temperature that make recirculated water reach a higher thermal diffusion environment temperature rapidly after the mensuration that finishes under the thermal diffusion environment temperature and can keep recirculated water in the conservation benefits thereby provide a kind of.
Thermal diffusivity of concrete determinator provided by the invention has test bucket, thermostatical circulating water feedway, measurement and control of temperature and operation control system in the determinator; Said test bucket is to place test specimen and make the test specimen surface form the container of the constant temperature thermal diffusion environment of recirculated water parcel; Said thermostatical circulating water feedway is the device that the required thermostatical circulating water of test process is provided to the test bucket, and electric pyrogenicity switch and recirculated water drive unit are installed, and the thermostatical circulating water feedway is connected with measurement and control of temperature and operation control system; Said measurement and control of temperature and operation control system are to comprise the temperature sensor that is embedded in the test specimen center, be arranged at the Environmental Water temperature sensor in the test bucket, temperature-time keeping device, the computer control system of temperature control equipment that is connected with electric pyrogenicity switch and the water cycle control device that is connected with recirculated water drive unit formation, wherein each sensor is the data input device of system, temperature-time keeping device is the part of the storer of system, temperature control equipment, the water cycle control device is the topworks of system, also has the artificial data input media in the computer control system in order to the predetermined constant temperature thermal diffusion environment temperature of artificial input;
Electric pyrogenicity switch in the said thermostatical circulating water feedway is made up of a cover large power, electrically well heater, a cover small power electric well heater and a cover small power electric refrigerator, wherein the large power, electrically well heater connects the switching mechanism in the temperature control equipment, and its heating power is greater than being warming up to the needed heat of constant temperature thermal diffusion environment temperature at 5min with the interior recirculated water that makes; The small power electric well heater is connected the powered controls in the temperature control equipment with the small power electric refrigerator, the maximum heating power of small power electric well heater is greater than the maximum heat absorption of test specimen in mensuration process power, the recirculated water exothermic maximum power sum to the heat interchange of device and environment, and the maximum refrigeration work consumption of small power electric refrigerator converts the heat release power sum of heat energy to the exothermic maximum power of the heat interchange of device and environment, kinetic energy that recirculated water flows greater than recirculated water in the mensuration process; The thermostatical circulating water feedway allows 1% of Initial Temperature Difference to the temperature departure of recirculated water in the test bucket less than the minimum of determinator, and the sensitivity of switching mechanism allows 0.3 ℃ of Initial Temperature Difference in the minimum of determinator.
Thermal diffusivity of concrete determinator provided by the invention, can control by following scheme and satisfy the mensuration make multiple temperature sections or full temperature section thermal diffusivity of concrete down the environment water temperature: (1) when equality of temperature body test specimen from an environment water temperature when the environment water temperature of another higher temperature is changed, when just present segment is measured beginning in multiple temperature sections is measured, open the large power, electrically well heater recirculated water is heated, the environment water temperature is closed after reaching current constant temperature thermal diffusion temperature (error ± 0.3 ℃) with interior at 5min; Open thermostatic control system subsequently, the power of control small power electric well heater remains in the current constant temperature thermal diffusion temperature ± 0.3 ℃ circulating water temperature, and makes the thermostatic control error allow 1% of Initial Temperature Difference less than the minimum of determinator in 15min.(2) when since the residing environment temperature of test unit higher, the heat absorption power of test specimen, the power sum that the kinetic energy that the hot exchange power of recirculated water and test unit environment and recirculated water flow converts heat energy to on the occasion of or near on the occasion of, in the time of can't realizing the control of thermostat temperature of recirculated water by the method for regulating heating power, open refrigerating plant simultaneously and control its refrigeration work consumption and keep certain value, make the heat absorption power of test specimen, the hot exchange power of recirculated water and test unit environment, recirculated water kinetic energy converts the power of heat energy to and the refrigeration work consumption sum of refrigerating plant is certain negative value, can heat the thermostatic control of the method realization recirculated water of power by control small power electric well heater.
Thermal diffusivity of concrete determinator provided by the invention, the large power, electrically well heater is arranged in the thermostatical circulating water feedway, and the power of large power, electrically well heater is enough to make the test bucket to reach another thermal diffusion temperature from a thermal diffusion temperature in 5min, thereby the thermal diffusivity of concrete that can carry out multiple temperature sections is measured.All make the small power electric well heater of the factor of circulating water temperature decline when also having peak power to work for remedying determinator, with peak power for can remedy determinator when work all make the small power electric refrigerator of the factor that circulating water temperature rises, and small power electric well heater and small power electric refrigerator be connected make on the temperature control equipment its can regulate heating or refrigeration work consumption come the control water temperature error the minimum of determinator allow Initial Temperature Difference 1% with interior and guarantee that error at measurment is in allowed band.Compared with prior art, apparatus of the present invention can fast lifting environment water temperature and realize that a test specimen, single test carry out the purpose that continuous multiple temperature sections is measured; Can adjust the environment water temperature and measure the purpose that the full temperature section of realization is measured at the thermal diffusion environment temperature point that is lower than the device context temperature from cold and hot two ends thermotropism diffusional environment temperature.Improved the control accuracy of environment water temperature simultaneously, thereby still can reach the desired error at measurment minimum value of bioassay standard though dwindled Initial Temperature Difference.
In addition, the small power electric refrigerator of installing in the thermal diffusivity of concrete determinator provided by the invention also is used to make low temperature equality of temperature body test specimen, measures the desired Initial Temperature Difference of thermal diffusivity to satisfy in the lower temperature section.During operation, after test specimen put into test unit, start the electric refrigerator in the thermostatical circulating water groove, keep circulating water temperature when the test specimen temperature is reduced to desired low temperature, wait to satisfy equality of temperature body test specimen formation condition and promptly finish during less than 0.1～0.2 times of the initial temperature differences of 5 ℃ or present segment mensuration when the temperature difference of environment water temperature and test specimen central temperature.Owing to make the qualification of equality of temperature body test specimen on not free, therefore the maximum refrigeration work consumption small power electric refrigerator that the exothermic maximum power of the heat interchange of device and environment, kinetic energy that recirculated water flows converted to the power sum of heat energy greater than recirculated water can be realized the temperature-fall period of test specimen.It as the thermal diffusion thermostat temperature 15 ℃ BYR method determination test, determinator for 0.1 ℃ of thermostatic control error, its Initial Temperature Difference requires to be about 10 ℃, determinator is reduced to 4 ℃ and keep with the small power electric refrigerator with the test specimen environment temperature, to the test specimen central temperature less than the thermal diffusivity mensuration that can begin this temperature section after 5 ℃.
Thermal diffusivity of concrete determinator provided by the invention, the peak power of said small power electric refrigerator are below the 300W.This is because the maximum refrigeration work consumption of small power electric refrigerator only needs greater than recirculated water the exothermic maximum power of the heat interchange of device and environment, the power sum that the mobile kinetic energy of recirculated water converts heat energy to, therefore the refrigeration work consumption of this small power electric refrigerator can be very little, thereby can select for use the refrigeration system of the low power frequency conversion cheaply product of having realized in enormous quantities, high-quality suitability for industrialized production to realize using, compared with prior art greatly reduce the integrated costs such as production, maintenance of determinator.
The cumulative volume of said determinator used thermostatical circulating water under trystate be test bucket volume with 2 times of the difference of standard specimen volume in so that temperature is controlled the used energy is few as much as possible.At this moment, large power, electrically well heater, small power electric well heater are the pipeline electric heating devices of series connection, and the evaporation tube of small power electric refrigerator covers outside the pipeline electric heating organ pipe wall, evaporation tube outer wrapping heat insulation layer.Another kind of scheme, the large power, electrically well heater is made up of a plurality of small power electric well heaters, and the small power electric well heater of temperature control usefulness is one of them.Another installation site of small power electric refrigerator is that evaporation tube is placed the interior equality of temperature body test specimen below of test bucket.
Description of drawings
Fig. 1 is the structure diagram of one embodiment of the invention, among the figure: 1-tests bucket, 2-constant temperature water body, 3-recirculated water water injection pipe (circulating water chennel rising pipe), 4-circulating water outlet pipe (circulating water chennel water inlet pipe), the 5-circulating water chennel, 6-small power electric refrigerator, 7-small power electric well heater, 8-large power, electrically well heater, 9, the 10-water circulating pump, the 11-test specimen, a-test specimen central temperature sensor, b-measures the Environmental Water temperature sensor, c-circulating water temperature sensor, d-circulating water chennel temperature sensor, the F1-frequency converter, the F2-power controller, the J-relay, J-1-switch (contact of J), the P-computing machine;
Fig. 2 is the structure diagram of another embodiment of the present invention, and among the figure: 21-tests bucket, 22-constant temperature water body, 23-recirculated water water injection pipe (heat-exchanging chamber rising pipe), 25-heat-exchanging chamber, 26-electric refrigeration device, 27-electricity heating device, 29-water circulating pump, 31-test specimen, a1-test specimen central temperature sensor, b1-measures Environmental Water temperature sensor, c1-circulating water temperature sensor, F11-frequency converter, F21-power controller, the J1-relay, J1-1-switch (contact of J1), P1-computing machine.
Embodiment
Example 1, a thermal diffusivity of concrete determinator as shown in Figure 1, comprise test bucket 1, thermostatical circulating water feedway, measurement and control of temperature and operation control system.Place equality of temperature body test specimen 11 during work in the test bucket, the constant temperature water body 2 that flooded test specimen top 5cm is arranged in the test bucket, the constant temperature water body is provided by the thermostatical circulating water feedway.The thermostatical circulating water feedway comprises the circulating water chennel 5 that electric pyrogenicity switch is installed, and circulating water chennel constitutes water circulation system through recirculated water water injection pipe (circulating water chennel rising pipe) 3, circulating water outlet pipe (circulating water chennel water inlet pipe) 4 and water circulating pump 9,10.Said electric pyrogenicity switch is to be the device that carries out heat interchange with recirculated water of the energy with the electricity, comprises electric heater and electric refrigerator.The electric pyrogenicity switch that is installed in the circulating water chennel comprises each cover of large and small power electric heater and a cover small power electric refrigerator.Wherein large power, electrically well heater 8 connects the switching mechanism in the temperature control equipments, and its heating power is greater than being warming up to the needed heat of constant temperature thermal diffusion environment temperature at 5min with the interior recirculated water that makes; Small power electric well heater 7 is connected the powered controls in the temperature control equipment with small power electric refrigerator 6.The maximum heating power of small power electric well heater is greater than the maximum heat absorption of test specimen in mensuration process power, the recirculated water exothermic maximum power sum to the heat interchange of device and environment, and the maximum refrigeration work consumption of small power electric refrigerator converts the heat release power sum of heat energy to the exothermic maximum power of the heat interchange of device and environment, kinetic energy that recirculated water flows greater than recirculated water in the mensuration process.
The thermostatical circulating water feedway is connected with measurement and control of temperature and operation control system; Said measurement and control of temperature and operation control system be by the temperature sensor a that is embedded in the test specimen center, be arranged at Environmental Water temperature sensor b in the test bucket, be installed in test bucket water delivering orifice circulating water temperature sensor c, be installed in the tank water temperature sensor d in the circulating water chennel; The computing machine P that comprises temperature-time keeping device, temperature control equipment, water cycle control device, each temperature sensor is connected the temperature signal input end of computing machine, the temperature control signals output terminal of computing machine is connected with electric pyrogenicity switch through temperature control equipment, the small power electric well heater is connected with computing machine through frequency converter F1 through power controller F2, small power electric refrigerator, and power controller is by temperature control signals regulating and controlling output power; The operation control signal of computing machine is connected with water circulating pump through the water cycle control device, and the water cycle control device is the switch of a starting mode of pump that is sent by computing machine and halt instruction control; The large power, electrically well heater is connected with power supply through switch J1-1, switch is the contact of a relay J 1, and in the work trigger signal source of relay, Continuity signal is derived from the operation control signal, pick-off signal is derived from temperature control signals, the mensuration (total mensuration begins or this temperature section is measured) that starts from that is the large power, electrically well heater begins, and ends at the environment water temperature and reaches thermal diffusion environment temperature ± 0.3; Sensor, computing machine and each control device constitute computer control system.Computer configuration has touch display screen, supports the artificial data input.The total moisture content observing and controlling error of temperature sensor, Computing process and temperature control equipment, electric pyrogenicity switch etc. allows 1% of Initial Temperature Difference less than the minimum of determinator.The sensitivity of the switching mechanism of large power, electrically well heater allows 0.3 ℃ of Initial Temperature Difference in the minimum of determinator.
Example 2, another thermal diffusivity of concrete determinator have test bucket 21, place equality of temperature body test specimen 31 in the constant temperature water body 22 in the test bucket, are embedded with test specimen central temperature sensor a1 in the equality of temperature body test specimen, then are provided with in the constant temperature water body to measure Environmental Water temperature sensor b1.Respectively there are water filling port and freeing port in the position, axis at the test specimen top in the test bucket and the test bucket end, is connected with water circulating pump 29 with recirculated water water pipe 23 between water filling port and the freeing port, is provided with circulating water temperature sensor c1 in the circulating water pipe.More greatly heat-exchanging chamber 25 of one section diameter is arranged on the recirculated water water pipe, the electric heater 27 that a plurality of small power electric well heaters constitute is installed in the heat-exchanging chamber, this electric heater connects into the high or low power electric heater with different taps.The freeing port at the test bucket end is equipped with small power electric refrigerator 26 (evaporation tube) between bottom test specimen.The cumulative volume 10.0L of thermostatical circulating water, thermostatted water volume 5.5L in the test bucket, large power, electrically heater power 5kW, small power electric heater power 0.5kW, small power electric refrigerator 250W.
The control system of device, one computing machine P1 is arranged, three place's temperature sensors insert computing machine, one relay J 1 is arranged, one normally opened contact J1-1 is the switch of large power, electrically well heater, is equipped with on the power lead of small power electric well heater on the power lead of power controller F21, small power electric refrigerator frequency converter F21 is installed.The control end of relay, power controller, frequency converter connects computing machine respectively.The same example of control procedure and control accuracy.
Example 3, with example 2, wherein the small power electric refrigerator adopts the semiconductor refrigerating component mounter outside the heat interchange locular wall, adopts power controller control refrigeration work consumption.
Thermal diffusivity of concrete determinator provided by the invention is than adopting the recirculated water more low power auxiliary cooling system of SL352 method determinator (small power electric refrigerator) to realize manying temperature section or/and the thermal diffusivity of concrete of total temperature section with BYR method METHOD FOR CONTINUOUS DETERMINATION.That has avoided adopting the SL352 method to measure and will run into is limited by refrigeration modes to the existing many deficiencies of the error control of constant temperature thermal diffusion temperature.Its thermostatic control implementation is:
When measuring thermostat temperature and be lower than the minimum temperature that the BYR method can realize, by refrigeration system realization initial adjustment: promptly regulate refrigeration work consumption, make circulating water temperature be lower than the constant temperature target temperature slightly; Finely tune by heating temperature control system on this basis, thereby realize accurately regulating.
When measuring thermostat temperature and be higher than the minimum temperature that the BYR method can realize, close refrigeration system, realize that by heating accurate permanent degree controls.
In addition, before the mensuration beginning, owing to have no time to limit, so can only need the very little refrigeration work consumption of employing to realize the purpose of the equality of temperature body test specimen of making low temperature through slow cooling, and then carry out the mensuration of low-temperature zone.
For example at first make low temperature isothermal body test specimen, cool to central temperature and begin below 8 ℃.First thermostat temperature is 20 ℃, and step is as follows:
1, opens the small power electric refrigerator, the test specimen temperature is dropped to 5 ℃～7 ℃, wait for after the equality of temperature concrete conditions in the establishment of a specific crime occurs and close the small power electric refrigerator.
2, open the large power, electrically well heater and make the environment water temperature bring up to 20 ℃ fast, close the large power, electrically well heater, open the small power electric well heater and enter thermostatic control.
3, open the small power electric refrigerator during thermostatic control simultaneously, implement the refrigeration coarse adjustment, heat accurate adjustment.The adjustment details is as follows:
A, determine the amount and the maintenance of the refrigeration of a coarse adjustment according to the temperature difference, then on this basis with heating the realization high precision temperature control.
B, then, when the test specimen temperature continued to raise, the refrigerating capacity of (also can classification) downward modulation coarse adjustment more progressively was to realize least energy consumption.Least energy consumption is exactly, the counteracting amount of the less refrigeration of trying one's best-heat.
Claims (6)
1. a thermal diffusivity of concrete determinator has test bucket, thermostatical circulating water feedway, measurement and control of temperature and operation control system in the determinator; Said test bucket is to place test specimen and make the test specimen surface form the container of the constant temperature thermal diffusion environment of recirculated water parcel; Said thermostatical circulating water feedway is the device that the required thermostatical circulating water of test process is provided to the test bucket, and electric pyrogenicity switch and recirculated water drive unit are installed, and the thermostatical circulating water feedway is connected with measurement and control of temperature and operation control system; Said measurement and control of temperature and operation control system are to comprise the temperature sensor that is embedded in the test specimen center, be arranged at the Environmental Water temperature sensor in the test bucket, temperature-time keeping device, the computer control system of temperature control equipment that is connected with electric pyrogenicity switch and the water cycle control device that is connected with recirculated water drive unit formation, wherein each sensor is the data input device of system, temperature-time keeping device is the part of the storer of system, temperature control equipment, the water cycle control device is the topworks of system, also has the artificial data input media in the computer control system in order to the predetermined constant temperature thermal diffusion environment temperature of artificial input;
It is characterized in that electric pyrogenicity switch in the said thermostatical circulating water feedway adds device by high-power and miniwatt two cover electricity and a cover small power electric refrigerator is formed, wherein the large power, electrically well heater connects the switching mechanism in the temperature control equipment, and its heating power is greater than being warming up to the needed heat of constant temperature thermal diffusion environment temperature at 5min with the interior recirculated water that makes; The small power electric well heater is connected the powered controls in the temperature control equipment with the small power electric refrigerator, the maximum heating power of small power electric well heater is greater than the maximum heat absorption of test specimen in mensuration process power, the recirculated water exothermic maximum power sum to the heat interchange of device and environment, and the maximum refrigeration work consumption of small power electric refrigerator converts the heat release power sum of heat energy to the exothermic maximum power of the heat interchange of device and environment, kinetic energy that recirculated water flows greater than recirculated water in the mensuration process; The thermostatical circulating water feedway allows 1% of Initial Temperature Difference to the temperature departure of recirculated water in the test bucket less than the minimum of determinator, and the sensitivity of switching mechanism allows 0.3 ℃ of Initial Temperature Difference in the minimum of determinator.
2. thermal diffusivity of concrete determinator as claimed in claim 1 is characterized in that the large power, electrically well heater is made up of a plurality of small power electric well heaters, and the small power electric well heater of temperature control usefulness is one of them.
3. thermal diffusivity of concrete determinator as claimed in claim 1 is characterized in that the evaporation tube of small power electric refrigerator places the interior equality of temperature body test specimen below of test bucket.
4. as claim 1 or 3 described thermal diffusivity of concrete determinators, the peak power that it is characterized in that said small power electric refrigerator is below the 300W.
5. thermal diffusivity of concrete determinator as claimed in claim 1 is characterized in that the cumulative volume of used thermostatical circulating water under the duty is in 2 times of difference of test bucket volume and standard specimen volume.
6. thermal diffusivity of concrete determinator as claimed in claim 5, it is characterized in that large power, electrically well heater, small power electric well heater are the pipeline electric heating devices of series connection, the evaporation tube of small power electric refrigerator covers outside the pipeline electric heating organ pipe wall, evaporation tube outer wrapping heat insulation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110251567.2A CN102288642B (en) | 2011-08-29 | 2011-08-29 | Concrete thermal diffusivity measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110251567.2A CN102288642B (en) | 2011-08-29 | 2011-08-29 | Concrete thermal diffusivity measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102288642A true CN102288642A (en) | 2011-12-21 |
| CN102288642B CN102288642B (en) | 2014-02-05 |
Family
ID=45335237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110251567.2A Active CN102288642B (en) | 2011-08-29 | 2011-08-29 | Concrete thermal diffusivity measurement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102288642B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134830A (en) * | 2013-01-28 | 2013-06-05 | 河海大学 | Ordinary clean cement paste early-age temperature conductivity coefficient prediction method based on multi-scale model |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4258667B2 (en) * | 2005-09-30 | 2009-04-30 | 独立行政法人産業技術総合研究所 | Thermophysical property measuring method and apparatus |
| WO2009098414A1 (en) * | 2007-12-12 | 2009-08-13 | Centre National De La Recherche Scientifique | Thermal analysis method and apparatus. |
| CN101576520A (en) * | 2009-06-03 | 2009-11-11 | 中国科学院化学研究所 | Thermal power measurement device |
| CN101915776A (en) * | 2010-07-06 | 2010-12-15 | 舟山市博远科技开发有限公司 | Measuring method for thermal diffusivity of concrete and testing device |
| CN101929968A (en) * | 2009-10-30 | 2010-12-29 | 中国计量科学研究院 | Device for measuring thermal diffusivity |
| CN201716276U (en) * | 2010-07-06 | 2011-01-19 | 舟山市博远科技开发有限公司 | Device for measuring thermal diffusivity of concrete |
| CN201754152U (en) * | 2010-08-04 | 2011-03-02 | 舟山市博远科技开发有限公司 | Testing device for determination of concrete thermal diffusivity |
| CN201892669U (en) * | 2010-12-08 | 2011-07-06 | 舟山市博远科技开发有限公司 | Concrete thermal diffusivity measuring device |
-
2011
- 2011-08-29 CN CN201110251567.2A patent/CN102288642B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4258667B2 (en) * | 2005-09-30 | 2009-04-30 | 独立行政法人産業技術総合研究所 | Thermophysical property measuring method and apparatus |
| WO2009098414A1 (en) * | 2007-12-12 | 2009-08-13 | Centre National De La Recherche Scientifique | Thermal analysis method and apparatus. |
| CN101576520A (en) * | 2009-06-03 | 2009-11-11 | 中国科学院化学研究所 | Thermal power measurement device |
| CN101929968A (en) * | 2009-10-30 | 2010-12-29 | 中国计量科学研究院 | Device for measuring thermal diffusivity |
| CN101915776A (en) * | 2010-07-06 | 2010-12-15 | 舟山市博远科技开发有限公司 | Measuring method for thermal diffusivity of concrete and testing device |
| CN201716276U (en) * | 2010-07-06 | 2011-01-19 | 舟山市博远科技开发有限公司 | Device for measuring thermal diffusivity of concrete |
| CN201754152U (en) * | 2010-08-04 | 2011-03-02 | 舟山市博远科技开发有限公司 | Testing device for determination of concrete thermal diffusivity |
| CN201892669U (en) * | 2010-12-08 | 2011-07-06 | 舟山市博远科技开发有限公司 | Concrete thermal diffusivity measuring device |
Non-Patent Citations (1)
| Title |
|---|
| 诸华丰等: "一种测定混凝土热扩散率的新方法", 《全国混凝土新技术、新标准及工程应用学术交流会暨混凝土质量委员会和建筑材料测试技术委员会2010年年会论文集》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134830A (en) * | 2013-01-28 | 2013-06-05 | 河海大学 | Ordinary clean cement paste early-age temperature conductivity coefficient prediction method based on multi-scale model |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102288642B (en) | 2014-02-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101915776B (en) | Measuring method for thermal diffusivity of concrete and testing device | |
| CN108931554B (en) | Storage and discharge energy testing system and method for non-ideal solid-liquid phase change material | |
| CN103464232B (en) | For detecting the constant temperature water bath apparatus of asphalt quality | |
| CN202189027U (en) | Concrete thermal diffusion rate measurement device | |
| CN101982756A (en) | Cold and hot alternation impact test device | |
| CN100494825C (en) | Heat pump double water circulation system for ocean thermocline emulation test platform | |
| CN107196012B (en) | A kind of cold and hot fluid circulation for power battery bench test | |
| CN107844139A (en) | Cold thermostat in car engine test stand high-precision analog | |
| CN102175351B (en) | Device for testing thermal performance and fluid resistance of liquid-liquid heat exchanger | |
| CN204027068U (en) | Portable type solar energy semiconductor temperature case | |
| CN104266840B (en) | Deep thermal shock testing device of heavy-duty engine | |
| CN107727951A (en) | A kind of thermo-electric generation monomer module thermoelectricity capability test table | |
| CN208171904U (en) | Measure the automation equipment of vacuum glass heat transfer coefficient | |
| CN102288642B (en) | Concrete thermal diffusivity measurement device | |
| CN108037149B (en) | Porous site device for rapidly and automatically measuring cold and hot circulation of phase-change material and measuring method thereof | |
| CN204515573U (en) | A kind of heating radiator thermal property detects water temperature, flow control system | |
| CN216624352U (en) | Three-stage water-cooling heat dissipation system for fuel cell engine test | |
| CN208026660U (en) | Phase-change material thermal stability automatic test device for building | |
| CN202049000U (en) | Improved thermostatic bath | |
| CN110096079A (en) | A kind of control system and method for low temperature sample stage | |
| CN112857058B (en) | Multipurpose furnace capable of regulating and controlling circulation temperature rise and fall for wide temperature area and temperature rise and fall method | |
| CN211148376U (en) | Phase change material durability circulation testing arrangement | |
| CN203011815U (en) | Material normal emission ratio test system | |
| CN201892669U (en) | Concrete thermal diffusivity measuring device | |
| CN202275138U (en) | Temperature changeable solar energy cell I-V characteristic testing arrangement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |