CN111537557B - Performance test method, system, medium and equipment of total heat exchange membrane - Google Patents
Performance test method, system, medium and equipment of total heat exchange membrane Download PDFInfo
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Abstract
The invention provides a performance test method, a system, a medium and equipment of a total heat exchange membrane, wherein the performance test method of the total heat exchange membrane comprises the following steps: when a total heat exchange membrane with known thermal resistance is placed in a total heat exchange membrane performance testing device, first temperature data in a preset time period are obtained; determining an error heat transfer value from the first temperature data; when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device, second temperature data and humidity data in a preset time period are obtained; the total heat exchange membrane to be tested is a total heat exchange membrane with unknown thermal resistance; and evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, the humidity data and the error heat transfer value. The invention can carry out individual test and coupling test on the heat transfer and moisture transfer performances of the total heat exchange membrane, and is used for screening and evaluating the total heat exchange membrane material and improving the performance.
Description
Technical Field
The invention relates to the technical field of performance evaluation of total heat exchange membranes, relates to a performance evaluation method, and particularly relates to a performance test method, a system, a medium and equipment of a total heat exchange membrane.
Background
At present, corresponding total heat exchanger specifications are established in China, the United states, europe and Japan, and the emphasis points of the specifications are different. Due to the climate difference of the standard setting area, the testing working conditions for detecting the total heat exchanger in the corresponding specification are different. In addition, ANRI 1060-2013 does not consider condensation and noise testing; EN308 does not place a detection requirement on the full thermal efficiency of the device; JISB8628 lacks testing for cabinet and internal air leakage; GB/T21087-2007 does not make a requirement on latent heat efficiency, but is more perfect in the aspects of application range, device type, working condition setting and the like. However, the detection requirements proposed by each standard are all specific to the whole machine, and no test index and test method related to the heat and humidity performance of the total heat exchange membrane are provided.
The total heat exchanger performs sensible heat recovery and total heat recovery using a total heat exchange membrane as a medium, and thus requires a material having good heat transfer performance and high permeability to water vapor. Aiming at the two performances, corresponding evaluation indexes of the total heat exchanger material are established in Japan at present, but China does not release the performance evaluation standard of the heat and moisture exchange material.
Japanese regulations only relate to a method for testing moisture permeability, air permeability and flame retardance of materials, and do not relate to a method for testing heat transfer performance of materials. Because the heat transfer resistance in the heat transfer process of the full heat exchange membrane is mainly heat transfer convection resistance, the heat transfer performance of the material is judged according to the whole heat transfer process, namely the heat transfer coefficient, at the two sides of the full heat exchange membrane. The method for testing the heat transfer coefficient of the test chamber mainly adopts a static hot box method which is generally divided into a calibration hot box method and a protection hot box method. The hot box method is generally used for measuring the heat transfer coefficient of building components or building enclosures, and the detection principle is that a piece to be measured is placed in a cold box and a hot box, and in a stable state, when the temperature of the cold box and the hot box is basically kept unchanged, the power input into the hot box and the air temperature of the cold box and the hot box are measured, so that the heat transfer coefficient of the piece to be measured is obtained. The basic principle of the hot box method is also applied to the test of the heat insulation performance of the greenhouse covering material. In the aspect of measuring the heat transfer coefficients of building components and greenhouse covering materials, the application of the hot box method is mature, but the specifications of the total heat exchange membrane of the total heat exchanger and the heat transfer characteristics are different from those of the total heat exchange membrane, and the existing specifications are suitable for measuring large-size test pieces in a test room. Therefore, the full heat exchange membrane heat transfer coefficient cannot be tested using the conditions and equipment required in the specifications.
For the moisture permeability test of the material, the test method can be divided into a weighing method and a sensor method according to the principle. The weighing method tests the moisture permeability of the piece to be tested by utilizing the humidity difference existing on the two sides of the moisture permeable cup; the sensor method mainly comprises an electrolysis method and an infrared detection method, wherein the electrolysis method utilizes the relationship between the electrolysis current and the water vapor to calculate the water vapor content of a piece to be detected so as to obtain the moisture permeability of the piece to be detected; the basic principle of the infrared detection method is that nitrogen and dry nitrogen with constant humidity flow through two sides of a piece to be detected respectively, water vapor flows from a wet side to a dry side due to humidity difference, finally, carrier gas is transmitted to an infrared detector to generate an electric signal, and the water vapor transmission rate of the piece to be detected is calculated through the electric signal. The 3 testing methods have advantages and disadvantages respectively, the weighing method has long testing time, is easy to be interfered by external factors, and has low precision; but its principle and test equipment are simple. The electrolysis method and the sensor method have high cost, and the instrument needs to be calibrated regularly, but the test precision is high.
As can be seen from the above-mentioned relevant specifications, the above-mentioned relevant specifications for the total heat exchanger focus on the performance evaluation of the whole machine, and do not relate to the performance test method and conditions of the total heat exchange membrane. The performance of the total heat exchange membrane can directly influence the efficiency of the static total heat exchanger. However, at present, two performance test methods in the heat transfer and moisture permeability test specifications of materials such as thin sheets, paper and the like are independent and are separately carried out. However, in the actual operation of the static total heat exchanger, the total heat exchange membrane simultaneously carries out heat transfer and mass transfer processes, and the heat transfer process and the mass transfer process interact and influence each other. The evaluation of the total heat exchange membrane according to a single index usually ignores the coupling influence and also makes the comparison of the advantages and disadvantages of the total heat exchange membrane difficult.
Therefore, how to provide a method, a system, a medium and a device for testing the performance of a total heat exchange membrane to solve the defects that the prior art cannot combine the coupling influence of heat transfer and mass transfer to evaluate the performance of the total heat exchange membrane, and the like, is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a method, a system, a medium, and an apparatus for testing performance of a total heat exchange membrane, which are used to solve the problem that the prior art cannot perform performance evaluation on the total heat exchange membrane in combination with coupling influence of heat transfer and mass transfer.
In order to achieve the above and other related objects, the present invention provides, in one aspect, a method for testing performance of a total heat exchange membrane, including: when a total heat exchange membrane with known thermal resistance is placed in a total heat exchange membrane performance testing device, first temperature data in a preset time period are obtained; determining an error heat transfer value from the first temperature data; when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device, second temperature data and humidity data in a preset time period are obtained; the total heat exchange membrane to be detected is a total heat exchange membrane with unknown thermal resistance; and evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, the humidity data and the error heat transfer value.
In an embodiment of the invention, the step of determining the error heat transfer value according to the first temperature data includes: substituting the first temperature data as a known quantity into an expression for a heat transfer coefficient; solving for the error heat transfer value as the only unknown.
In an embodiment of the present invention, the expression of the heat transfer coefficient is:
the first temperature data comprises a first initial temperature and first measurement temperatures corresponding to different moments, and the temperature difference is the difference value between the first measurement temperature at the last moment in the preset time period and the initial temperature.
In an embodiment of the invention, the step of evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, the humidity data and the error heat transfer value includes: determining the heat transfer coefficient of the total heat exchange membrane to be measured according to the expression of the heat transfer coefficient by taking the second temperature data and the error heat transfer value as known quantities; determining the mass transfer coefficient of the total heat exchange membrane to be tested by taking the humidity data as a known quantity according to an expression of the mass transfer coefficient; and determining an enthalpy value change curve of the total heat exchange membrane to be tested by taking the second temperature data and the humidity data as known quantities according to an enthalpy value expression.
In an embodiment of the present invention, the expression of the mass transfer coefficient is:
the expression of the enthalpy value is as follows: enthalpy =1.01 · second temperature data + (2500 +1.84 · second temperature data) · humidity data.
In an embodiment of the present invention, the apparatus for testing performance of a total heat exchange membrane includes a cold box and a hot box; evaluating the heat transfer performance of the full heat exchange membrane to be tested according to the heat transfer coefficient; evaluating the mass transfer performance of the total heat exchange membrane to be tested according to the mass transfer coefficient; determining the ratio of the air enthalpy value of the total heat exchange membrane to be tested under the initial condition in a cold box or a box body of a hot box to the last-time air enthalpy value in the preset time period; in the plurality of total heat exchange membranes to be tested, the smaller the ratio of the cold boxes, the better the heat and moisture transfer performance of the total heat exchange membranes to be tested is judged; for the heat box, the larger the ratio is, the better the heat and moisture transfer performance of the total heat exchange membrane to be tested is judged.
In an embodiment of the invention, in the process of determining the error heat transfer value, the heat transfer coefficient, the mass transfer coefficient and the enthalpy value, the first temperature data, the second temperature data and the humidity data are measured for a plurality of times to obtain an average value.
The invention also provides a performance test system of the total heat exchange membrane, which comprises the following components: the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring first temperature data in a preset time period when a total heat exchange membrane with known thermal resistance is placed in a total heat exchange membrane performance testing device; an error module to determine an error heat transfer value based on the first temperature data; the second acquisition module is used for acquiring second temperature data and humidity data within a preset time period when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device; the total heat exchange membrane to be tested is a total heat exchange membrane with unknown thermal resistance; and the performance evaluation module is used for evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, the humidity data and the error heat transfer value.
Another aspect of the present invention provides a medium, on which a computer program is stored, which when executed by a processor implements the performance testing method for the total heat exchange membrane.
A final aspect of the invention provides an apparatus comprising: a processor and a memory; the memory is used for storing computer programs, and the processor is used for executing the computer programs stored in the memory so as to enable the equipment to execute the performance testing method of the total heat exchange membrane.
As described above, the performance test method, system, medium and device of the total heat exchange membrane of the present invention have the following beneficial effects:
(1) The problem of the coupling test of the heat transfer and mass transfer performance of the material in the existing specification is solved; (2) The total heat transfer efficiency of the total heat exchange membrane test piece including convection heat transfer is considered, and the total heat transfer efficiency is not limited to the heat conductivity coefficient of the test piece; (3) The test time is short, the test flow is simple, and the test result is accurate.
Drawings
Fig. 1 is a front view of a total heat exchange membrane performance testing apparatus to which the present invention is applied.
FIG. 2 is a top view of a total heat exchange membrane performance testing apparatus applied in the present invention.
Fig. 3 is a schematic view of a full heat exchange membrane fixture in an embodiment of the performance testing method of the full heat exchange membrane of the invention.
Fig. 4 is a schematic view of an insulation board of a total heat exchange membrane performance testing device applied in the invention.
FIG. 5 is a schematic flow chart of a performance testing method for a total heat exchange membrane according to an embodiment of the present invention.
FIG. 6 is a flow chart of performance evaluation of the method for testing the performance of the total heat exchange membrane of the present invention in one embodiment.
FIG. 7 is a schematic structural diagram of a system for testing the performance of a total heat exchange membrane according to an embodiment of the present invention.
FIG. 8 is a schematic structural connection diagram of a device for testing the performance of a total heat exchange membrane according to an embodiment of the present invention.
Description of the element reference numerals
1. First axial flow fan
2. First air valve
3. Circulating air pipe
4. Second air valve
5. Second axial fan
6. Gas transmission pipe
7. Third air valve
8. First humidity self-recording instrument
9. Reagent kit
10. Heating device
11. Temp. self-recording instrument
12. Second humidity self-recording instrument
13. Air inlet pipe
14. Exhaust pipe
15. Full heat exchange membrane fixing clamp
16. Total heat exchange membrane clamp
17. Total heat exchange membrane
18. Heat insulation board
71. First acquisition module
72. Error module
73. Second acquisition module
74. Performance evaluation module
81. Processor with a memory for storing a plurality of data
82. Memory device
83. Transceiver
84. Communication interface
85. System bus
S51 to S54 steps
S541-S543
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The invention provides a method for testing the heat and humidity performance of a total heat exchange membrane, which can quickly evaluate the heat and humidity performance of the total heat exchange membrane, solves the problem of evaluation defects of the total heat exchange membrane material in the current domestic and foreign specifications, considers the influence of air flow on heat transfer and humidity transfer, and realizes the heat and humidity coupling test of the total heat exchange membrane.
The principle and implementation of the method, system, medium and apparatus for testing the performance of the total heat exchange membrane of the present embodiment will be described in detail below with reference to fig. 1 to 8, so that those skilled in the art can understand the method, system, medium and apparatus for testing the performance of the total heat exchange membrane of the present embodiment without creative work.
Fig. 1 to fig. 3 are a front view of a total heat exchange membrane performance testing apparatus, a top view of the total heat exchange membrane performance testing apparatus, and a schematic diagram of a total heat exchange membrane fixture according to an embodiment of a total heat exchange membrane performance testing method. As shown in fig. 1 to 3, the box body of the whole apparatus includes a cold box and a hot box, a total heat exchange membrane clamp is connected between the cold box and the hot box, the total heat exchange membrane is called as a total heat exchange membrane test piece in the specific embodiment, and the preparation work of the total heat exchange membrane test piece for performing the heat and humidity performance test by using the corresponding test apparatus is as follows: first, the testing device cover plate is opened, and a total heat exchange membrane test piece 17 with known thermal resistance is placed in the total heat exchange membrane fixture 16 and fixed by the total heat exchange membrane fixture 15. Placing heat insulation plates 18 on two sides of the clamp, covering a cover plate, and sealing; secondly, after the full heat exchange membrane performance testing device is closed, closing the first air valve 2 in the circulating air pipe 3 at the upper part of the box body, and opening the second air valves 4 and the air inlet pipes 13 on the air conveying pipes 6 at the two sides of the box body and the third air valves 7 on the air exhaust pipes 14; opening a temperature self-recording instrument 11 and a second humidity self-recording instrument 12 on the upper part of the box body; opening the first humidity self-register 8 on the exhaust pipe 14; checking whether the desiccant and water in the kit 9 are sufficient; thirdly, starting a second axial flow fan 5 in the gas pipe 6, adjusting the depth of the gas inlet pipe 13 inserted into the reagent according to the reading of the first humidity self-recording instrument 8, and controlling the moisture content in the circulating air until the second humidity self-recording instrument 12 arranged in the box body displays that the humidity of the air in the box body reaches the test initial working condition; fourthly, closing the second axial flow fan 5 and the second air valve 4; opening a switch of a heating device 10 on the upper part of the box body, moving forward to heat air in the box body until a temperature self-recording instrument 11 is installed in the box body to display that the temperature of the air in the box body reaches a testing working condition, and closing the heating device 10; and fifthly, pulling down the heat preservation plate 18, opening the first air valve 2 on the circulating air pipe 3, and starting the first axial flow fan 1. The box bodies of the cold box and the hot box start to transfer heat and moisture through the total heat exchange membrane test piece 17, and the temperature self-recorder 11 and the second humidity self-recorder 12 record the temperature change of the two box bodies in real time; sixthly, after the test period is finished, data are recorded according to the temperature self-recorder 11 and the humidity self-recorder 12.
Note that, if the position of a component which is not numbered in fig. 1 to 3 is similar to that of a component with a known number, the name of the component is the same as the technical role.
Specifically, the test working condition refers to that the indoor environment of a test room is maintained at 24 ℃ in summer and the relative humidity is 60%; the indoor environment is maintained at 20 ℃ and the relative humidity is 60% in winter. And performing list management on the refrigeration working condition and the heating working condition to form a test working condition table in the table 1.
TABLE 1 initial working condition table for cold and hot box
It should be noted that, when the total heat exchange membrane test piece with known thermal resistance is placed in the total heat exchange membrane performance testing apparatus, the temperature self-recorder 11 measures first temperature data, and when the total heat exchange membrane test piece to be tested is placed in the total heat exchange membrane performance testing apparatus, the temperature self-recorder 11 measures second temperature data. The preparation process of the full heat exchange membrane test piece with known thermal resistance and the preparation process of the full heat exchange membrane test piece to be tested before the test are placed on the full heat exchange membrane performance test device for testing are the same.
Fig. 4 is a schematic view of an insulation board of a total heat exchange membrane performance testing apparatus applied in the present invention. As shown in fig. 4, the heat-insulating plates 18 are placed on both sides of the total heat exchange membrane holder 16 before the start of the test, and inhibit the total heat exchange membrane from performing heat transfer and moisture transfer before the start of the test.
Please refer to fig. 5, which is a schematic flowchart illustrating a performance testing method of a total heat exchange membrane according to an embodiment of the present invention. The invention is based on the principle of heat and mass transfer, in a static total heat exchanger, fresh air and exhaust air flow in different channels, and the heat and mass transfer process is completed through a total heat exchange membrane. The sensible heat transfer is carried out through the heat conduction of the membrane and the convection heat exchange between the membrane and fluid on two sides; the latent heat transfer is carried out by convective mass transfer between the two sides and the membrane and partial molecular diffusion in the membrane.
Because the total heat exchange membrane of the total heat exchanger is in the heat transfer process, the thermal resistance is derived from convective heat exchange thermal resistance and material heat conduction thermal resistance, the heat transfer performance of the total heat exchange membrane cannot be reflected by testing the heat conduction coefficient of the total heat exchange membrane, and the mass transfer process can influence the heat transfer process. Therefore, the testing device reflects the heat and mass transfer performance of the total heat exchanger by testing the heat transfer coefficient and the mass transfer coefficient of the membrane of the total heat exchanger.
As shown in fig. 5, the method for testing the performance of the total heat exchange membrane specifically includes the following steps:
s51, when the total heat exchange membrane with known thermal resistance is placed in the total heat exchange membrane performance testing device, first temperature data in a preset time period are obtained.
S52, determining an error heat transfer value according to the first temperature data.
In the present embodiment, the first temperature data is substituted as a known quantity into an expression of a heat transfer coefficient; and solving the error heat transfer value as a unique unknown quantity.
Specifically, the expression of the heat transfer coefficient is:
the first temperature data comprise a first initial temperature and first measured temperatures corresponding to different moments, and the temperature difference is the difference value between the first measured temperature at the last moment in the preset time period and the initial temperature.
In an ideal situation, the heat transfer calculation process is:
assuming the enclosure is thermally insulated, all heat is transferred from the hot enclosure to the cold enclosure through the total heat exchange membrane, and the transferred heat is used entirely for cold enclosure air heating.
q = K.A.DELTA.T equation (1)
In the formula (1), q is the heat exchange quantity of the total heat exchange membrane, and the unit is W; k is the heat transfer coefficient of the total heat exchange membrane and has the unit of W/(m) 2 DEG C.); a is the total heat exchange membrane surface area, and the unit is m 2 (ii) a Delta T is the temperature difference of the cold box and the hot box, and the unit is; t is the heat exchange time of the cold and hot box, and the unit is s.
The time integration is performed on both sides of equation (1):
q.dt =: [ integral ] q.dt = integral multiple of K.A Δ T dt equation (2)
The temperature difference between the cold and hot boxes is a function of time t:
Δ T = f (T) formula (3)
Therefore, the cold box heat Q varies as:
Q＝c·m·ΔT n = K · a ·: (t) dt equation (4)
Heat transfer coefficient K:
in the formula (5), Δ T n Measuring the temperature difference between the cold box and the initial temperature, wherein the unit is; t is t 0 The time required to reach the measured temperature is in units of s; c is the air constant-volume specific heat capacity, and the unit is J/(kg DEG C); m is the air mass of the cooling box and the unit is kg.
In practice, the change in the cold box air temperature is not only due to the heat transfer Q through the total heat exchange membrane 1 And also with heat transfer Q through the interlayer 2 And heat transfer Q between the tank and the outside 3 It is related. Therefore, the heat required for the temperature rise of the cold box is the sum of the three.
Q＝Q 1 +Q 2 +Q 3 ＝c·m·ΔT n Formula (6)
Carrying out steady state measurement by using a known homogeneous test piece at different box body wall temperatures to obtain the resistance output heat and Q of the inner wall of the box body 3 The relationship (2) of (c). For a given device, Q 2 Which is generally a function of specimen thickness, specimen thermal resistance, and frame structure. Q was measured at steady state using known homogeneous test pieces 2 And calibrating the coefficient.
S53, when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device, acquiring second temperature data and humidity data in a preset time period; the total heat exchange membrane to be tested is a total heat exchange membrane with unknown thermal resistance.
And S54, evaluating the performance of the total heat exchange membrane to be measured according to the second temperature data, the humidity data and the error heat transfer value.
Please refer to fig. 6, which illustrates a performance evaluation flowchart of the performance testing method of the total heat exchange membrane according to an embodiment of the present invention. As shown in fig. 6, S54 includes:
and S541, determining the heat transfer coefficient of the to-be-measured total heat exchange membrane according to the expression of the heat transfer coefficient by taking the second temperature data and the error heat transfer value as known quantities.
And S542, determining the mass transfer coefficient of the total heat exchange membrane to be tested by taking the humidity data as a known quantity according to an expression of the mass transfer coefficient.
In this embodiment, the expression of the mass transfer coefficient is:
ideal state mass transfer calculation:
m d ＝K m ·A·Δd·ρ air formula (8)
The difference in the moisture content of the air in the cold and hot boxes is a function of time t:
Δ d = g (t) formula (9)
Thus, the cold box air moisture content M varies as:
M＝m·Δd n ＝K m ·A·ρ air formula (10)
Mass transfer coefficient K m Comprises the following steps:
in the formulas (8) to (11), K m Is the total heat exchange membrane mass transfer coefficient, and the unit is m/s; m is the air mass of the cold box, and the unit is kg; Δ d represents the difference between the current point in time and the humidity of the cold (hot) box air at the next point in time in g/kg (dry air); t is t 0 The time required to achieve the measured humidity is given in s; Δ d n The difference between the measured humidity and the initial humidity for the cold box is given in g/kg (dry air); a is the total heat exchange membrane surface area, and the unit is m 2 ；ρ air Is density of dry airIn units of kg/m 3 。
It should be noted that there is a slight difference between the air quality of the cold box and the air quality of the hot box, and in the present invention, the air quality of the cold box and the air quality of the hot box are regarded as equal, and the air quality of the box is the product of the air density and the box volume, wherein the air density is known from the common general knowledge, and the box volume is also known after the box is given.
And S543, determining an enthalpy value change curve of the total heat exchange membrane to be tested by taking the second temperature data and the humidity data as known quantities according to an enthalpy value expression.
In this embodiment, the expression of the enthalpy is:
enthalpy =1.01 · second temperature data + (2500 +1.84 · second temperature data) · humidity data.
And reading data of temperature and humidity self-recording instruments installed in the cold box and the hot box, and obtaining the air temperature and humidity change curve in the box body after the test is finished. Calculating and drawing the change curve of the air enthalpy value of the cold and hot box bodies along with time, wherein the calculation formula is as follows:
i '=1.01T' + (2500 +1.84T '). D' equation (6)
In the formula (7), i' represents the air enthalpy value and has the unit of kJ/kg; t' represents the air temperature in units of; d' represents the air moisture content in kg/kg (dry air).
Specifically, in the performance evaluation process, the all-heat exchange membrane performance testing device comprises a cold box and a hot box.
And evaluating the heat transfer performance of the total heat exchange membrane to be tested according to the heat transfer coefficient.
And evaluating the mass transfer performance of the total heat exchange membrane to be tested according to the mass transfer coefficient.
And determining the ratio of the air enthalpy value of the total heat exchange membrane to be tested in the cold box or the box body of the hot box under the initial condition to the air enthalpy value at the last moment in the preset time period.
In the multiple total heat exchange membranes to be tested, the smaller the ratio of the cold box to the total heat exchange membranes to be tested is, the better the heat-moisture transfer performance of the total heat exchange membranes to be tested is judged; for the heat box, the larger the ratio is, the better the heat and moisture transfer performance of the total heat exchange membrane to be tested is judged.
In this embodiment, the preset time period refers to a test cycle. The test period is calculated as follows:
the test period is determined according to the heat transfer time. Supposing that in an ideal state, all heat is transferred through a total heat exchange membrane, the air temperature of the cold box and the air temperature of the hot box are uniform, and the air temperature of the hot box is T 1 The air temperature of the cold box is T 2 。
The heat transfer of the total heat exchange membrane at unit time:
q = K.A.DELTA.T equation (8)
Temperature change of the cold box and the hot box:
integrated over equation (12) to yield:
in the formula (14), Δ T 0 The unit is the initial temperature difference of the cold box and the hot box; and (3) estimating the convective heat transfer coefficient under the length of the total heat exchange membrane according to an empirical formula of laminar heat transfer of the isothermal fluid outer swept flat plate, thereby estimating the heat transfer coefficient K of the total heat exchange membrane and estimating the test time t.
Further, in the process of determining the error heat transfer value, the heat transfer coefficient, the mass transfer coefficient and the enthalpy value, the first temperature data, the second temperature data and the humidity data are measured for multiple times to obtain an average value.
The performance testing system for the total heat exchange membrane provided in this embodiment will be described in detail with reference to the drawings. It should be noted that the division of the modules of the following system is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity or may be physically separated. And the modules can be realized in a form that all software is called by the processing element, or in a form that all the modules are realized in a form that all the modules are called by the processing element, or in a form that part of the modules are called by the hardware. For example: a module may be a separate processing element, or may be integrated into a chip of the system described below. Further, a certain module may be stored in the memory of the following system in the form of program code, and a certain processing element of the following system may call and execute the function of the following certain module. Other modules are implemented similarly. All or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, the steps of the above method or the following modules may be implemented by hardware integrated logic circuits in a processor element or instructions in software.
The following modules may be one or more integrated circuits configured to implement the above methods, for example: one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Field Programmable Gate Arrays (FPGAs), and the like. When some of the following modules are implemented in the form of a program code called by a Processing element, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling the program code. These modules may be integrated together and implemented in the form of a System-on-a-chip (SOC).
Please refer to fig. 7, which is a schematic structural diagram of a system for testing performance of a total heat exchange membrane according to an embodiment of the present invention. As shown in fig. 7, the performance testing system 7 for the total heat exchange membrane includes: a first acquisition module 71, an error module 72, a second acquisition module 73, and a performance evaluation module 74.
The first obtaining module 71 is configured to obtain first temperature data within a preset time period when a total heat exchange membrane with known thermal resistance is placed in the total heat exchange membrane performance testing apparatus.
The error module 72 is configured to determine an error heat transfer value based on the first temperature data.
In this embodiment, the error module 72 is specifically configured to substitute the first temperature data as a known quantity into an expression for a heat transfer coefficient; solving for the error heat transfer value as the only unknown.
Specifically, the heat transfer coefficient is expressed as:
the first temperature data comprises a first initial temperature and first measurement temperatures corresponding to different moments, and the temperature difference is the difference value between the first measurement temperature at the last moment in the preset time period and the initial temperature.
The second obtaining module 73 is configured to obtain second temperature data and humidity data within a preset time period when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing apparatus; the total heat exchange membrane to be tested is a total heat exchange membrane with unknown thermal resistance.
The performance evaluation module 74 is configured to evaluate the performance of the total heat exchange membrane to be measured according to the second temperature data, the humidity data, and the error heat transfer value.
In this embodiment, the performance evaluation module 74 is specifically configured to determine the heat transfer coefficient of the total heat exchange membrane to be measured according to the expression of the heat transfer coefficient by using the second temperature data and the error heat transfer value as known quantities; determining the mass transfer coefficient of the total heat exchange membrane to be tested by taking the humidity data as a known quantity according to an expression of the mass transfer coefficient; and determining an enthalpy value change curve of the total heat exchange membrane to be tested by taking the second temperature data and the humidity data as known quantities according to an enthalpy value expression.
Specifically, the expression of the mass transfer coefficient is as follows:
the expression of the enthalpy value is as follows: enthalpy =1.01 · second temperature data + (2500 +1.84 · second temperature data) · humidity data.
Specifically, the full heat exchange membrane performance testing device comprises a cold box and a hot box; the performance evaluation module 74 is configured to evaluate the heat transfer performance of the total heat exchange membrane to be tested according to the heat transfer coefficient; evaluating the mass transfer performance of the total heat exchange membrane to be tested according to the mass transfer coefficient; determining the ratio of the air enthalpy value of the total heat exchange membrane to be tested under the initial condition in a cold box or a box body of a hot box to the air enthalpy value at the last moment in the preset time period; in the multiple total heat exchange membranes to be tested, the smaller the ratio of the cold box to the total heat exchange membranes to be tested is, the better the heat-moisture transfer performance of the total heat exchange membranes to be tested is judged; for the heat box, the larger the ratio is, the better the heat-moisture transfer performance of the total heat exchange membrane to be measured is judged.
The embodiment provides a computer storage medium, on which a computer program is stored, wherein the computer program is used for realizing the performance test method of the total heat exchange membrane when being executed by a processor.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned computer-readable storage medium comprises: various computer storage media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Please refer to fig. 8, which is a schematic structural connection diagram of a performance testing apparatus of a total heat exchange membrane according to an embodiment of the present invention. As shown in fig. 8, the present embodiment provides an apparatus 8, the apparatus 8 including: a processor 81, memory 82, transceiver 83, communication interface 84, or/and system bus 85; the memory 82 and the communication interface 84 are connected with the processor 81 and the transceiver 83 through the system bus 85 and are used for mutual communication, the memory 82 is used for storing computer programs, the communication interface 84 is used for communicating with other equipment, and the processor 81 and the transceiver 83 are used for running the computer programs so as to enable the equipment to execute the steps of the performance testing method of the total heat exchange membrane.
The system bus 85 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The system bus 85 may be divided into an address bus, a data bus, a control bus, and the like. The communication interface is used for realizing communication between the database access device and other equipment (such as a client, a read-write library and a read-only library). The memory may include a Random Access Memory (RAM), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor 81 may be a general-purpose processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component.
The protection scope of the method for testing the performance of the total heat exchange membrane is not limited to the execution sequence of the steps listed in the embodiment, and all the solutions obtained by adding or subtracting steps and replacing steps in the prior art according to the principles of the present invention are included in the protection scope of the present invention.
The invention also provides a performance testing system of the total heat exchange membrane, which can realize the performance testing method of the total heat exchange membrane, but the device for realizing the performance testing method of the total heat exchange membrane comprises but is not limited to the structure of the performance testing system of the total heat exchange membrane listed in the embodiment, and all structural modifications and substitutions of the prior art made according to the principle of the invention are included in the protection scope of the invention.
In summary, the performance test method, system, medium and device for the total heat exchange membrane provided by the invention provide a method for testing the heat and humidity performance of the total heat exchange membrane, which can quickly evaluate the heat and humidity performance of the total heat exchange membrane, solve the evaluation defects of the total heat exchange membrane material in the current domestic and foreign specifications, consider the influence of air flow on heat transfer and humidity transfer, and realize the heat and humidity coupling test of the total heat exchange membrane. The problem of the coupling test of heat transfer and mass transfer performance of the material in the existing specification is solved; the total heat transfer efficiency of the total heat exchange membrane test piece including convection heat transfer is considered, and the total heat transfer efficiency is not limited to the heat conductivity coefficient of the test piece; the test time is short, the test flow is simple, and the test result is accurate. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The performance test method of the total heat exchange membrane is characterized by comprising the following steps:
when a total heat exchange membrane with known thermal resistance is placed in a total heat exchange membrane performance testing device, first temperature data in a preset time period are obtained; the full heat exchange membrane performance testing device comprises a cold box and a hot box; the first temperature data refers to the temperature of a cold box and the temperature of a hot box when a total heat exchange membrane with known thermal resistance is placed in the total heat exchange membrane performance testing device;
determining an error heat transfer value from the first temperature data; taking the first temperature data as a known quantitySubstituting into an expression of the heat transfer coefficient; solving the error heat transfer value as a unique unknown quantity; the expression of the heat transfer coefficient is:
the first temperature data comprises a first initial temperature and first measured temperatures corresponding to different moments, and the temperature difference is the difference value between the first measured temperature at the last moment in the preset time period and the initial temperature;
when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device, second temperature data and humidity data in a preset time period are obtained; the total heat exchange membrane to be tested is a total heat exchange membrane with unknown thermal resistance; the second temperature data refers to the temperature of a cold box and the temperature of a hot box when the full heat exchange membrane to be tested is placed in the full heat exchange membrane performance testing device; the humidity data refers to the humidity of a cold box and the humidity of a hot box when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device;
evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, the humidity data and the error heat transfer value; determining the heat transfer coefficient of the total heat exchange membrane to be measured according to the expression of the heat transfer coefficient by taking the second temperature data and the error heat transfer value as known quantities; determining the mass transfer coefficient of the total heat exchange membrane to be tested by taking the humidity data as a known quantity according to an expression of the mass transfer coefficient; determining an enthalpy value change curve of the total heat exchange membrane to be tested by taking the second temperature data and the humidity data as known quantities according to an enthalpy value expression; wherein the expression of the mass transfer coefficient is as follows:
2. the method for testing the performance of the total heat exchange membrane according to claim 1,
the expression of the enthalpy value is as follows: enthalpy =1.01 · second temperature data + (2500 +1.84 · second temperature data) · humidity data.
3. The method for testing the performance of a total heat exchange membrane according to claim 1,
evaluating the heat transfer performance of the total heat exchange membrane to be tested according to the heat transfer coefficient;
evaluating the mass transfer performance of the total heat exchange membrane to be tested according to the mass transfer coefficient;
determining the ratio of the air enthalpy value of the total heat exchange membrane to be tested under the initial condition in a cold box or a box body of a hot box to the air enthalpy value at the last moment in the preset time period;
in the multiple total heat exchange membranes to be tested, the smaller the ratio of the cold box to the total heat exchange membranes to be tested is, the better the heat-moisture transfer performance of the total heat exchange membranes to be tested is judged; for the heat box, the larger the ratio is, the better the heat-moisture transfer performance of the total heat exchange membrane to be measured is judged.
4. The method for testing the performance of a total heat exchange membrane according to claim 1,
and in the process of determining the error heat transfer value, the heat transfer coefficient, the mass transfer coefficient and the enthalpy value, carrying out multiple measurements on the first temperature data, the second temperature data and the humidity data and taking an average value.
5. The performance test system for the total heat exchange membrane is characterized by comprising the following components:
the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring first temperature data in a preset time period when a total heat exchange membrane with known thermal resistance is placed in a total heat exchange membrane performance testing device; the full heat exchange membrane performance testing device comprises a cold box and a hot box; the first temperature data refers to the temperature of a cold box and the temperature of a hot box when the total heat exchange membrane with known thermal resistance is placed in the total heat exchange membrane performance testing device;
an error module to determine an error heat transfer value based on the first temperature data; substituting the first temperature data as a known quantityIn the expression of the heat transfer coefficient; solving the error heat transfer value as a unique unknown quantity; the expression of the heat transfer coefficient is:
the first temperature data comprises a first initial temperature and first measured temperatures corresponding to different moments, and the temperature difference is the difference value between the first measured temperature at the last moment in the preset time period and the initial temperature;
the second acquisition module is used for acquiring second temperature data and humidity data within a preset time period when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device; the total heat exchange membrane to be tested is a total heat exchange membrane with unknown thermal resistance; the second temperature data refers to the temperature of a cold box and the temperature of a hot box when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device; the humidity data refers to the humidity of a cold box and the humidity of a hot box when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance testing device;
the performance evaluation module is used for evaluating the performance of the to-be-tested total heat exchange membrane according to the second temperature data, the humidity data and the error heat transfer value; determining the heat transfer coefficient of the total heat exchange membrane to be measured according to the expression of the heat transfer coefficient by taking the second temperature data and the error heat transfer value as known quantities; determining the mass transfer coefficient of the total heat exchange membrane to be tested by taking the humidity data as a known quantity according to an expression of the mass transfer coefficient; determining an enthalpy value change curve of the total heat exchange membrane to be tested by taking the second temperature data and the humidity data as known quantities according to an enthalpy value expression; wherein the expression of the mass transfer coefficient is as follows:
6. a medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, implements the method for testing the performance of a total heat exchange membrane according to any one of claims 1 to 4.
7. An apparatus, comprising: a processor and a memory;
the memory is used for storing a computer program, and the processor is used for executing the computer program stored by the memory so as to cause the device to execute the performance test method of the total heat exchange membrane as claimed in any one of claims 1 to 4.
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