CN110568006B - Heat storage density testing method and system for heat storage material - Google Patents
Heat storage density testing method and system for heat storage material Download PDFInfo
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- CN110568006B CN110568006B CN201810575323.1A CN201810575323A CN110568006B CN 110568006 B CN110568006 B CN 110568006B CN 201810575323 A CN201810575323 A CN 201810575323A CN 110568006 B CN110568006 B CN 110568006B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 166
- 239000011232 storage material Substances 0.000 title claims abstract description 87
- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 91
- 238000005265 energy consumption Methods 0.000 claims abstract description 83
- 238000000034 method Methods 0.000 claims abstract description 32
- 230000008859 change Effects 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 9
- 239000011449 brick Substances 0.000 description 12
- 238000004458 analytical method Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000012782 phase change material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000000113 differential scanning calorimetry Methods 0.000 description 2
- 238000004452 microanalysis Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007707 calorimetry Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses a method and a system for testing heat storage density of a heat storage material, wherein the method comprises the following steps: and measuring first energy consumption when the heating device is heated from a first temperature to a second temperature when the heating device is vacant and second energy consumption when the heating device is heated from the first temperature to the second temperature after the heat storage material to be detected is put into the heating device, and calculating the heat storage density of the heat storage material to be detected according to the mass of the heat storage material to be detected, the first temperature, the second temperature, the first energy consumption and the second energy consumption. The heat storage density of the heat storage material is measured by the measuring method, and the heat storage density is closer to the actual application condition compared with a trace testing method due to the fact that the factors that the heat storage material is used in a molded product with a certain scale in the actual application are considered. Therefore, the heat storage density of the whole large-module heat storage material can be reflected more accurately.
Description
Technical Field
The invention relates to the technical field of phase change heat storage, in particular to a heat storage density testing method and system for a heat storage material.
Background
The traditional heat storage density test method is obtained by firstly measuring the specific heat capacity of a material by utilizing a differential scanning calorimetry method, a microcalorimetry method or an adiabatic calorimetry method and other microanalysis methods and then integrating the specific heat capacity and the temperature difference, and if phase change occurs in a temperature range, the phase change enthalpy of the material is added. In the traditional method, when the specific heat capacity of the material is measured, the sample is generally sampled at the mg level, and the measurement result is high in accuracy but only aims at a trace sample at the mg level, so that the method is not widely applicable.
In the practical application process of the heat storage material, the volume and the mass of the heat storage module are relatively large (generally above the kg grade), and the heat storage material in the heat storage module is likely to have the condition of uneven distribution, so that the specific heat result obtained by a microanalysis method test cannot accurately reflect the heat storage density of the whole large module heat storage material.
Disclosure of Invention
Therefore, the invention provides a method and a system for testing the heat storage density of a heat storage material, and solves the problem that the heat storage density of a large-module heat storage material cannot be accurately reflected by the result of a microcalorimetry test in the prior art.
The embodiment of the invention provides a heat storage density testing method of a heat storage material, which comprises the following steps:
measuring first energy consumption when the heating device is empty and heated from a first temperature to a second temperature, and measuring second energy consumption when the heating device is filled with a heat storage material to be tested and heated from the first temperature to the second temperature; and calculating the heat storage density of the heat storage material to be detected according to the mass of the heat storage material to be detected, the first temperature, the second temperature, the first energy consumption and the second energy consumption.
Preferably, the heat storage density of the heat storage material is calculated according to the following formula:
Wherein H is the heat storage density, M is the mass of the heat storage material to be measured, and T0Is a first temperature, T1At a second temperature, E0For the first energy consumption, E1Is the second energy consumption.
Preferably, before the step of measuring the first energy consumption when the heating device is empty and heated from the first temperature to the second temperature, the method further comprises: and testing the reliability of the heating device.
Preferably, the step of performing a reliability test on the heating device specifically includes:
acquiring energy consumption changes of heating the vacant heating device from a first temperature to a second temperature at least twice; generating energy consumption comparison according to the energy consumption change, and judging whether the energy consumption comparison is smaller than a preset value; and when the energy consumption comparison is smaller than the preset value, judging that the heating device is reliable.
Preferably, the second temperature is higher than the phase transition temperature of the heat storage material to be measured.
The embodiment of the invention also provides a heat storage density testing system of the heat storage material, which comprises: the device comprises a heating device, an electric energy analysis device and a data processing device, wherein the heating device is used for heating from a first temperature to a second temperature when the device is vacant and heating from the first temperature to the second temperature after a heat storage material to be detected is placed in the device; the electric energy analysis device is used for measuring first energy consumption when the heating device is empty and heated from a first temperature to a second temperature, and measuring second energy consumption when the heating device is filled with a heat storage material to be measured and heated from the first temperature to the second temperature; the data processing device is used for acquiring the mass, the first temperature, the second temperature, the first energy consumption and the second energy consumption of the heat storage material to be detected, and calculating the heat storage density of the heat storage material to be detected according to the mass, the first temperature, the second temperature, the first energy consumption and the second energy consumption of the heat storage material to be detected.
Preferably, the data processing device calculates the heat storage density of the heat storage material to be measured according to the following formula:
wherein H is heat storage density, M is preset mass, and T0Is a first temperature, T1At a second temperature, E0For the first energy consumption, E1Is the second energy consumption.
The technical scheme of the invention has the following advantages:
the embodiment of the invention provides a method and a system for testing the heat storage density of a heat storage material, wherein the method comprises the following steps: measuring the energy consumption when the heating device is heated from the normal temperature to a temperature higher than the phase-change temperature when the heating device is empty, and the energy consumption when the heating device is heated from the normal temperature to a temperature higher than the phase-change temperature after the heat storage material to be detected is put into the heating device, and calculating the heat storage density of the heat storage material to be detected according to the mass of the heat storage material to be detected, the energy consumption in the two heating processes and the temperature values before and after heating. The heat storage density of the heat storage material is measured by the measuring method, and the heat storage density is closer to the actual application condition compared with a trace testing method due to the fact that the factors that the heat storage material is used in a molded product with a certain scale in the actual application are considered. Therefore, the heat storage density of the whole large-module heat storage material can be reflected more accurately.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of a method for testing a heat storage density of a heat storage material according to an embodiment of the present invention;
fig. 2 is a flowchart of another specific example of a method for testing a heat storage density of a heat storage material according to an embodiment of the present invention;
FIG. 3 is a graph comparing the energy consumption curves of the heating furnace according to the embodiment of the present invention after the heating furnace is empty-fired under the same temperature raising condition;
FIG. 4 is a graph showing the comparison of energy consumption between an empty-burning heating furnace and a heat storage brick in the embodiment of the present invention;
fig. 5 is a composition diagram of a heat storage density testing system of a heat storage material in an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a heat storage density testing method of a heat storage material, as shown in figure 1, the method comprises the following steps:
step S1: and measuring first energy consumption when the heating device is heated from the first temperature to the second temperature when the heating device is idle, and second energy consumption when the heating device is heated from the first temperature to the second temperature after the heat storage material to be detected is put into the heating device.
In the embodiment of the invention, the heating device can be a heating furnace, the heat storage material to be detected is a heat storage brick made of a phase-change material, the first temperature is normal temperature, and the second temperature is a temperature higher than the phase-change temperature of the phase-change material; the energy consumption in the heating process when the heating furnace is empty-burned and the energy consumption in the heating process after the heat storage bricks are placed in the heating furnace are accurately measured through an electric energy analyzer. The heating mode is a constant-speed heating mode, but not limited to this, and in practical application, the heating mode can be set as required.
Step S2: and calculating the heat storage density of the heat storage material to be detected according to the mass of the heat storage material to be detected, the first temperature, the second temperature, the first energy consumption and the second energy consumption.
In the embodiment of the invention, the heat storage density of the heat storage material is calculated according to the following formula:
wherein H is the heat storage density, M is the mass of the heat storage material to be measured, and T0Is a first temperature, T1At a second temperature, E0For the first energy consumption, E1Is the second energy consumption.
In the embodiment of the invention, a heat storage brick is placed in a heating furnace, the heating furnace is heated from normal temperature to the temperature higher than the phase transition temperature of the heat storage brick, the energy consumption of the heating furnace during idle burning and the energy consumption of the heat storage brick after being placed in the heating furnace are measured by an electric energy analyzer, and the heat storage density of the heat storage brick is calculated according to the parameter value and the formula.
In a preferred embodiment, before performing step S1, the method for testing the heat storage density of the heat storage material of the embodiment of the invention further includes: and (5) carrying out reliability test on the heating device. As shown in fig. 2, the process of the reliability test specifically includes:
step S1a, obtaining at least two changes in energy consumption for heating an empty heating device from a first temperature to a second temperature. In the embodiment of the invention, the first temperature is normal temperature, and the second temperature is a temperature higher than the phase-change temperature of the phase-change material.
And S1b, generating energy consumption comparison according to the energy consumption change, and judging whether the energy consumption comparison is smaller than a preset value. In the embodiment of the invention, the energy consumption generated in the two empty burning processes of the heating furnace is compared and compared with the preset value.
And S1c, judging that the heating device is reliable when the energy consumption contrast is smaller than a preset value. In the embodiment of the invention, as shown in fig. 3, a comparison graph of energy consumption curves of the heating furnace after empty burning heating under the same heating condition is shown, the two curves are basically consistent, the error rate is less than 0.5%, which indicates that the accuracy of the heating furnace is higher, and the experimental data is credible. As shown in fig. 4, under the same temperature rise condition, the energy consumption comparison curves of the empty-burning heating furnace and the heating furnace after the heat storage brick is placed in the heating furnace show that the energy consumption trends of the two curves are basically the same in the heat preservation stage of 4h-6h, and the energy consumption difference of the two curves under the same condition is the heat stored by the heat storage brick under the condition.
In one embodiment, a small amount (10mg) of heat storage material is scraped from three different positions on the heat storage brick, and after being ground into powder, the powder is heated from 25 ℃ to 720 ℃ by using Differential Scanning Calorimetry (DSC) in the existing micro-method, and three heat storage density calculations are respectively performed, and data obtained by using the micro-method are shown in table 1:
TABLE 1
According to the heat storage density testing method provided by the embodiment of the invention, the average value of the power consumption of two heating furnaces when the temperature is increased from 25 ℃ to 720 ℃ is 1.53285kwh, a heat storage brick (2.5kg) is selected to be placed in the heating furnace to be heated from 25 ℃ to 720 ℃, the heat storage density is calculated for three times by using the heat storage density calculation formula, and the obtained data is shown in table 2:
TABLE 2
As can be seen from comparison of the heat storage densities obtained by the tests in tables 1 and 2, the specific heat capacity and the phase change enthalpy of the sample have large amplitude changes when the micro method is used for testing, and the calculated heat storage densities are also different greatly; the heat storage density value obtained by directly measuring the heat storage brick by adopting the measuring method provided by the embodiment of the invention is more stable. The micro-method is explained to have higher data accuracy when measuring a specific micro-sample, but cannot stably and accurately reflect the heat storage density of the heat storage material product due to the reasons that the sample is not uniformly distributed when measuring a sample with larger mass or volume and the like.
The embodiment of the invention provides a method for testing the heat storage density of a heat storage material, which comprises the following steps: measuring the energy consumption when the heating device is heated from the normal temperature to a temperature higher than the phase-change temperature when the heating device is empty, and the energy consumption when the heating device is heated from the normal temperature to a temperature higher than the phase-change temperature after the heat storage material to be detected is put into the heating device, and calculating the heat storage density of the heat storage material to be detected according to the mass of the heat storage material to be detected, the energy consumption in the two heating processes and the temperature values before and after heating. The heat storage density of the heat storage material is measured by the measuring method, and the heat storage density is closer to the actual application condition compared with a trace testing method due to the fact that the factors that the heat storage material is used in a molded product with a certain scale in the actual application are considered. Therefore, the heat storage density of the whole large-module heat storage material can be reflected more accurately.
Example 2
An embodiment of the present invention provides a heat storage density testing system for a heat storage material, as shown in fig. 5, including: a heating device 1, an electric energy analysis device 2 and a data processing device 3, wherein,
the heating device 1 is used to heat from the first temperature to the second temperature when the device is idle and to heat from the first temperature to the second temperature after the heat storage material to be tested is placed, and step S1 in embodiment 1 is executed correspondingly, which is not described herein again.
The electric energy analysis device 2 is configured to measure a first energy consumption when the heating device is empty and heated from the first temperature to the second temperature, and measure a second energy consumption when the heating device is filled with the heat storage material to be measured and heated from the first temperature to the second temperature, and step S1 in embodiment 1 is correspondingly executed, which is not described herein again.
The data processing device 3 is configured to obtain the quality, the first temperature, the second temperature, the first energy consumption, and the second energy consumption of the heat storage material to be detected, calculate the heat storage density of the heat storage material to be detected according to the quality, the first temperature, the second temperature, the first energy consumption, and the second energy consumption of the heat storage material to be detected, and perform step S1 in embodiment 1 correspondingly, which is not described herein again. In the embodiment of the invention, the heat storage density of the heat storage material is calculated according to the following formula:
Wherein H is the heat storage density, M is the mass of the heat storage material to be measured, and T0Is a first temperature, T1At a second temperature, E0For the first energy consumption, E1Is the second energy consumption.
The heat storage density test system of the heat storage material provided by the embodiment of the invention comprises: the heating device electric energy analysis device and the data processing device respectively measure the energy consumption when the heating device is heated from normal temperature to a temperature higher than the phase transition temperature when the heating device is empty, and the energy consumption when the heating device is heated from normal temperature to a temperature higher than the phase transition temperature after the heat storage material to be detected is placed in the heating device, and the heat storage density of the heat storage material to be detected is calculated according to the quality of the heat storage material to be detected, the energy consumption in two heating processes and the temperature values before and after heating. Therefore, the heat storage density of the whole large-module heat storage material can be reflected more accurately.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (4)
1. A method for testing heat storage density of a heat storage material is characterized by comprising the following steps:
respectively measuring first energy consumption when the heating furnace is empty and heated from a first temperature to a second temperature and second energy consumption when the heat storage material to be detected is placed in the heating furnace and heated from the first temperature to the second temperature through an electric energy analyzer; the second temperature is higher than the phase change temperature of the heat storage material to be detected;
calculating the heat storage density of the heat storage material to be detected according to the mass of the heat storage material to be detected, the first temperature, the second temperature, the first energy consumption and the second energy consumption;
calculating a heat storage density of the heat storage material according to the following formula:
wherein H is the heat storage density, M is the mass of the heat storage material to be tested, and T0Is a first temperature, T1At a second temperature, E0For the first energy consumption, E1Is the second energy consumption.
2. The method for testing the heat storage density of the heat storage material as claimed in claim 1, further comprising, before the step of measuring the first energy consumption when the heating furnace is empty and heated from the first temperature to the second temperature:
and carrying out reliability test on the heating furnace.
3. The method for testing the heat storage density of the heat storage material as claimed in claim 2, wherein the step of performing the reliability test on the heating furnace specifically comprises:
Acquiring energy consumption change of heating an empty heating furnace from a first temperature to a second temperature at least twice;
generating energy consumption comparison according to the energy consumption change, and judging whether the energy consumption comparison is smaller than a preset value;
and when the energy consumption comparison is smaller than the preset value, judging that the heating furnace is reliable.
4. A heat storage density test system of a heat storage material, comprising: a heating furnace, an electric energy analyzer and a data processing device, wherein,
the heating furnace is used for heating from a first temperature to a second temperature when the heating furnace is vacant and heating from the first temperature to the second temperature after the heat storage material to be tested is placed in the heating furnace; the second temperature is higher than the phase change temperature of the heat storage material to be detected;
the electric energy analyzer is used for measuring first energy consumption when the heating furnace is empty and heated from a first temperature to a second temperature, and measuring second energy consumption when the heating furnace is placed with a heat storage material to be measured and heated from the first temperature to the second temperature;
the data processing device is used for acquiring the mass, the first temperature, the second temperature, the first energy consumption and the second energy consumption of the heat storage material to be detected, and calculating the heat storage density of the heat storage material to be detected according to the mass, the first temperature, the second temperature, the first energy consumption and the second energy consumption of the heat storage material to be detected; the data processing device calculates the heat storage density of the heat storage material to be detected according to the following formula:
Wherein H is the heat storage density, M is the mass of the heat storage material to be measured, and T0Is a first temperature, T1At a second temperature, E0For the first energy consumption, E1Is the second energy consumption.
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