CN216847561U - Cold surface frost formation measuring device - Google Patents
Cold surface frost formation measuring device Download PDFInfo
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- CN216847561U CN216847561U CN202123081190.9U CN202123081190U CN216847561U CN 216847561 U CN216847561 U CN 216847561U CN 202123081190 U CN202123081190 U CN 202123081190U CN 216847561 U CN216847561 U CN 216847561U
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Abstract
The application belongs to the technical field of refrigeration, and particularly relates to a device for measuring frosting quantity of a cold surface. The existing measuring device is easily interfered by external environment and experimental equipment, and has large measurement fluctuation and lower precision. The application provides a cold surface frost formation measuring device, which comprises a testing container, wherein a cold surface, a gas state parameter acquisition component and a temperature control component are arranged in the testing container, the cold surface is connected with a temperature regulation component, the temperature regulation component and the testing container are sealed, the gas state parameter acquisition component is connected with a measurement and control component, a temperature measurement component is arranged on the inner surface of the testing container, the temperature measurement component is connected with the measurement and control component, and the measurement and control component is used for processing acquired data; the test container can be closed. The measurement precision is higher, and the measurement process is airtight not disturbed by external environment and experimental facilities, and the measuring result is stable.
Description
Technical Field
The application belongs to the technical field of refrigeration, and particularly relates to a device for measuring frosting quantity of a cold surface.
Background
In various industrial fields, frost often appears on the surface of an evaporator, blocks a gas flow passage, and the refrigeration performance of the evaporator is seriously affected by the thermal resistance of a frost layer. The frosting amount is one of important parameters reflecting the accumulation characteristics of the frost layer. In practical application, heating for defrosting is often adopted, and then a balance is used for weighing the mass of defrosting water, so that the frosting amount is regarded as the frosting amount. Such a direct measurement device ignores the mass of water vapor evaporated into the air during heating and the mass of water remaining attached to the fins, and may generate a large error. According to the improved measuring system of the measuring device, the frosting amount is obtained by adding the mass of the water absorbed by the water absorption paper on the surface of the fin and the mass of the defrosted water weighed by the balance, the precision is improved, but an additional error is brought by artificial random factors, and the operation process is complex. An indirect measurement scheme is to measure the humidity difference of the wet air before and after passing through the evaporator, and calculate the frosting amount on the evaporator. The proposal has higher precision requirement on the measuring instrument, is easily influenced by the fluctuation of experimental devices and external environment parameters, and is difficult to obtain the frosting amount with high precision and high stability.
The existing measuring device is easily interfered by external environment and experimental equipment, and has large measurement fluctuation and lower precision.
Disclosure of Invention
1. Technical problem to be solved
Based on current measuring device receives external environment and experimental facilities's interference easily, it is great to measure undulant, the lower problem of precision, this application provides a cold surface frost measuring device.
2. Technical scheme
In order to achieve the aim, the application provides a cold surface frost formation measuring device which comprises a testing container, wherein a cold surface, a gas state parameter acquisition component and a temperature control component are arranged in the testing container, the cold surface is connected with a temperature regulation component, the temperature regulation component and the testing container are kept sealed, the gas state parameter acquisition component is connected with a measurement and control component, a temperature measurement component is arranged on the inner surface of the testing container and connected with the measurement and control component, and the measurement and control component is used for processing acquired data; the test container can be closed.
Another embodiment provided by the present application is: the test receptacle includes an inlet and an outlet, the inlet being connected to the first shut-off assembly and the outlet being connected to the second shut-off assembly.
Another embodiment provided by the present application is: the gas state parameter acquisition assembly comprises a temperature and humidity collector and a pressure collector, the temperature and humidity collector is connected with the measurement and control assembly, the pressure collector is connected with the measurement and control assembly, and the temperature and humidity collector is matched with the temperature measurement assembly for use to compensate and obtain the actual temperature.
Another embodiment provided by the present application is: the temperature control assembly includes a heater for elevating a temperature within the test vessel.
Another embodiment provided by the present application is: the heater is connected with the radiator, and the radiator is used for strengthening the heat transfer in the test container and simultaneously improving the uniformity of the gas distribution in the test container
Another embodiment provided by the present application is: the temperature regulation assembly comprises a cold head connecting piece, and the cold surface is connected with the refrigeration assembly through the cold head connecting piece.
Another embodiment provided by the present application is: the cold surface is a flat surface, a fin surface, an irregular surface or a heat exchanger, and the frost formation and the evaporation process of the heated frost occur on the cold surface.
Another embodiment provided by the present application is: the test container enables the gas in the heated space to be in an unsaturated state; the test container is a cube, a cuboid or a cylinder.
The application also provides an application of the device for measuring the frosting amount of the cold surface, and the device is used for quality measurement of a phase change process.
Another embodiment provided by the present application is: the phase change process comprises the formation of frost, condensation or CO in the humid air2And (4) frosting.
3. Advantageous effects
Compared with the prior art, the cold surface frost formation measuring device that this application provided's beneficial effect lies in:
the application provides a cold surface frost formation measuring device for not receiving the cold surface frost formation measuring device of external environment and equipment interference.
The application provides a cold surface frost measuring device, measurement accuracy is higher, and the measurement process is airtight not disturbed by external environment and experimental facilities, and the measuring result is stable.
Drawings
Fig. 1 is a schematic structural view of a cold surface frost formation measuring apparatus according to the present application.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different examples may be combined to obtain new embodiments, or certain features may be substituted for certain embodiments to obtain yet other preferred embodiments, without departing from the principles of the present application.
Referring to fig. 1, the application provides a cold surface frosting amount measuring device, which comprises a test container 1, wherein a cold surface 4, a gas state parameter acquisition component and a temperature control component are arranged in the test container 1, the cold surface 4 is connected with a temperature regulation component 5, the temperature regulation component 5 and the test container 1 are kept sealed, the gas state parameter acquisition component is connected with a measurement and control component 11, a temperature measurement component 10 is arranged on the inner surface of the test container 1, the temperature measurement component 10 is connected with the measurement and control component 11, and the measurement and control component is used for processing acquired data; the test container 1 can be closed.
The cold surface 4 is connected with the external environment through the temperature adjusting assembly 5, so that the sealing property of the testing environment is ensured; the measurement and control component 11 calculates the heat balance between the inner surface temperatures of the test container 1 measured by the gas state parameter acquisition component and the temperature measurement component 10, and gives certain temperature compensation to the gas state parameter acquisition component, so that the actual temperature in the test container 1 can be obtained; and two sets of data obtained by processing the high-precision actual gas state equation in the measurement and control assembly 11 are utilized, and the parameters are calculated and processed by the measurement and control assembly 11 to obtain the frost formation amount of the cold surface.
The temperature measuring component 10 is used for measuring the temperature of the inner surface of the test container 1 and transmitting data to the measurement and control component 11;
the measurement and control component 11 is used for calculating the heat balance between the directly measured data before and after the test container 1 is sealed and the temperature of the inner surface of the test container 1, and compensating to obtain the actual temperature; the method comprises the steps of storing an actual gas state equation of the relationship between gas density and gas parameters such as gas temperature, humidity and pressure in advance; and then, according to the calculation of the gas density and the internal volume of the test container 1, obtaining the difference value of two groups of data settlement results before and after the test container 1 is closed, and determining the frosting amount on the cold surface 4.
The volume or gas temperature in the constant volume test container 1 needs to make the gas in the heated container in an unsaturated state; the test container 1 may be specially designed and the frosting measurement may also be performed in existing containers that meet the airtight conditions. The frost formation on the cold surface 4 and the evaporation of the frost after heating takes place.
The measurement and control module 11 is used for processing the relationship between the gas density and the gas parameters such as gas temperature, humidity, pressure, etc., and the actual gas state equation used includes, but is not limited to, the wet air virial equation.
Further, the test receptacle 1 comprises an inlet and an outlet, the inlet being connected to the first shut-off member 2 and the outlet being connected to the second shut-off member 3.
The first stopping component 2 and the second stopping component 3 are used for controlling the gas circulation and sealing in the constant volume testing container 1; the test container 1 may be closed, including but not limited to this form.
Further, the gas state parameter collecting assembly comprises a temperature and humidity collector 6 and a pressure collector 7, the temperature and humidity collector 6 is connected with the measurement and control assembly 11, the pressure collector 7 is connected with the measurement and control assembly 11, and the temperature and humidity collector 6 is matched with the temperature measuring assembly 10 for use, so that actual temperature can be obtained through compensation.
The temperature and humidity collector 6 is used for collecting the temperature and humidity of the gas in the space before and after the test space is closed, and transmitting two groups of data collected before and after the test container 1 is closed to the measurement and control assembly 11 for processing the data; the pressure collector 7 is used for collecting gas pressure in the space before and after the test space is closed, and transmitting two groups of data collected before and after the test container 1 is closed to the measurement and control assembly 11 to process the data.
The temperature in the test space measured by the temperature and humidity collector 6 needs to be subjected to heat balance calculation with the temperature of the inner surface of the test container 1 measured by the temperature measurement component 10. And the temperature measured by the temperature and humidity collector 6 is compensated to a certain extent, so that the actual temperature of the gas in the test container 1 is obtained.
Further, the temperature control assembly comprises a heater 8, the heater 8 being adapted to raise the temperature inside the test receptacle 1. The heater 8 is used for raising the temperature in the test container 1 after the stopping device is closed, so that the frost is completely evaporated and gasified after being melted.
Further, the heater 8 is connected with a heat sink 9, and the heat sink 9 is used for enhancing the heat transfer in the test container 1 and simultaneously improving the uniformity of the gas distribution in the test container 1
Further, the temperature regulating assembly 5 comprises a cold head connection, through which the cold surface is connected with the refrigeration assembly.
The cold head connecting piece is used for connecting the measuring cold surface 4 with external equipment so as to realize temperature regulation of the cold surface 4, and the cold head connecting piece and the test container 1 are kept sealed.
Further, the cold surface 4 is an irregular surface, a flat surface, a fin surface or a heat exchanger, and the evaporation process of frost formation and heated frost occurs on the cold surface 4.
Further, the test container 1 is capable of bringing the gas in the heated space to a non-saturated state; the test container 1 is a cube, a cuboid or a cylinder.
The application also provides an application of the device for measuring the frosting amount of the cold surface, and the device is used for quality measurement of a phase change process.
Further, the phase change process includes humid air frosting, humid air condensation or CO2And (4) frosting.
And processing two groups of gas state parameters obtained before and after the test space is closed by using a high-precision actual gas state equation, calculating to obtain the gas density in the test space before and after heating, and calculating the mass difference before and after the test space is closed by combining the internal volume of the test space to obtain the frosting amount.
Specifically, after the cold surface 4 is frosted for a certain time, the first stopping assembly 2 and the second stopping assembly 3 of the inlet and the outlet are closed, and the temperature and humidity collector 6 and the pressure collector 7 record first gas state parameters including a first temperature, a first relative humidity and a first pressure in the test container 1 in the state; starting a heater 8 and a radiator 9, raising the temperature in the closed test container 1, accelerating the frost melting, completely evaporating and gasifying, and recording second gas state parameters including a second temperature, a second relative humidity and a second pressure in the test container 1 again by the temperature and humidity collector 6 and the pressure collector 7; carrying out heat balance calculation on the first temperature and the temperature of the inner surface of the test container 1 by adopting the measurement and control assembly 11 to obtain a first actual temperature in the test container 1, and carrying out heat balance calculation on the second temperature and the temperature of the inner surface of the test container 1 by adopting the measurement and control assembly 11 to obtain a second actual temperature in the test container 1; and calculating by using a high-precision actual gas state equation in the measurement and control assembly 11 to obtain the gas density difference in the test container 1 before and after heating, and calculating by combining with the solvent of the test container 1 with a constant volume to obtain the frosting amount. Or respectively calculating the gas density in the test container 1 before and after heating, and calculating by combining with the solvent of the test container 1 with a constant volume to obtain the frosting amount.
Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (8)
1. A cold surface frosting amount measuring device is characterized in that: the device comprises a test container, wherein a cold surface, a gas state parameter acquisition component and a temperature control component are arranged in the test container, the cold surface is connected with a temperature regulation component, the temperature regulation component and the test container are kept sealed, the gas state parameter acquisition component is connected with a measurement and control component, a temperature measurement component is arranged on the inner surface of the test container, the temperature measurement component is connected with the measurement and control component, and the measurement and control component is used for processing acquired data; the test container can be closed.
2. A cold surface frost formation measuring apparatus according to claim 1, wherein: the test receptacle includes an inlet and an outlet, the inlet being connected to the first shut-off assembly and the outlet being connected to the second shut-off assembly.
3. A cold surface frost formation measuring apparatus according to claim 1, wherein: the gas state parameter acquisition assembly comprises a temperature and humidity collector and a pressure collector, the temperature and humidity collector is connected with the measurement and control assembly, the pressure collector is connected with the measurement and control assembly, and the temperature and humidity collector is matched with the temperature measurement assembly for use to compensate and obtain the actual temperature.
4. A cold surface frost formation measuring apparatus according to claim 1, wherein: the temperature control assembly includes a heater for elevating a temperature within the test vessel.
5. The cold surface frost measurement apparatus of claim 4, wherein: the heater is connected with the radiator, and the radiator is used for strengthening the heat transfer in the test container and simultaneously improving the uniformity of the gas distribution in the test container.
6. A cold surface frost formation measuring apparatus according to any of claims 1 to 5, wherein: the temperature regulation assembly comprises a cold head connecting piece, and the cold surface is connected with the refrigeration assembly through the cold head connecting piece.
7. The cold surface frost measurement apparatus of claim 6, wherein: the cold surface is an irregular surface, a flat surface, a fin surface or a heat exchanger, and the frost formation and the evaporation process of the heated frost occur on the cold surface.
8. The cold surface frost measurement apparatus of claim 6, wherein: the test container enables the gas in the heated space to be in an unsaturated state; the test container is a cube, a cuboid or a cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123081190.9U CN216847561U (en) | 2021-12-09 | 2021-12-09 | Cold surface frost formation measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123081190.9U CN216847561U (en) | 2021-12-09 | 2021-12-09 | Cold surface frost formation measuring device |
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| Publication Number | Publication Date |
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| CN216847561U true CN216847561U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123081190.9U Active CN216847561U (en) | 2021-12-09 | 2021-12-09 | Cold surface frost formation measuring device |
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| CN (1) | CN216847561U (en) |
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2021
- 2021-12-09 CN CN202123081190.9U patent/CN216847561U/en active Active
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