CN111537557B - Performance test method, system, medium and equipment of total heat exchange membrane - Google Patents

Abstract

The invention provides a performance testing method, system, medium and equipment of a total heat exchange membrane. The performance testing method of the total heat exchange membrane includes: when a total heat exchange membrane with known thermal resistance is placed in a total heat exchange membrane performance test device, acquire the first temperature data within a preset time period; determine the error heat transfer value according to the first temperature data; Set the second temperature data and humidity data within the time period; the total heat exchange film to be tested is a total heat exchange film with unknown thermal resistance; evaluate the to-be-tested total heat exchange film according to the second temperature data, humidity data and error heat transfer value Measure the performance of the total heat exchange membrane. The invention can carry out independent test and coupling test on the heat transfer and moisture transfer performance of the total heat exchange membrane, and is used for the screening evaluation and performance improvement of the total heat exchange membrane material.

Description

Performance testing method, system, medium and equipment of total heat exchange membrane

technical field

The invention relates to the technical field of performance evaluation of total heat exchange membranes, and relates to a performance evaluation method, in particular to a performance test method, system, medium and equipment of a total heat exchange membrane.

Background technique

At present, my country, the United States, Europe and Japan have formulated corresponding specifications for total heat exchangers, and the focus of each specification is different. Due to climate differences in standard-setting areas, there are differences in the test conditions for testing total heat exchangers in the corresponding specifications. In addition, ANRI 1060-2013 does not consider the condensation and noise test; EN308 does not put forward testing requirements for the total thermal efficiency of the device; JISB8628 lacks the test for the cabinet and internal air leakage; Latent heat efficiency puts forward requirements, but it is more perfect in terms of scope of application, device category, and working condition setting. However, the testing requirements of each standard are all for the whole machine, and there are no test indicators and test methods related to the thermal and humidity performance of the total heat exchange membrane.

The total heat exchanger uses the total heat exchange membrane as a medium to recover sensible heat and total heat, so the material is required to have good heat transfer performance and high permeability to water vapor. In view of the above two properties, Japan has formulated corresponding evaluation indicators for total heat exchanger materials, but my country has not yet issued performance evaluation standards for heat and moisture exchange materials.

The Japanese standard only involves the test methods of material moisture permeability, air permeability and flame retardancy, and does not involve the test of material heat transfer performance. Since the heat transfer resistance in the heat transfer process of the total heat exchange membrane is mainly the convective heat transfer resistance, the heat transfer performance of the material is judged according to the overall heat transfer process on both sides of the total heat exchange membrane, that is, the heat transfer coefficient. The test method of heat transfer coefficient in the test chamber is mainly the static hot box method, which is generally divided into the calibration hot box method and the protective hot box method. The hot box method is generally used to measure the heat transfer coefficient of building components or enclosure structures. The detection principle is to put the test piece into the cold and hot boxes. , measure the power input into the hot box and the air temperature of the cold and hot boxes, so as to obtain the heat transfer coefficient of the DUT. The basic principle of the hot box method is also applied to the insulation performance testing of greenhouse covering materials. In terms of determining the heat transfer coefficient of building components and greenhouse covering materials, the application of the hot box method has been very mature, but the specifications and heat transfer characteristics of the total heat exchange film of the total heat exchanger are different from the above two, and the existing specifications are applicable to the test room Measure large size test pieces. Therefore, the conditions and equipment required in the specification cannot be used to test the heat transfer coefficient of the total heat exchange membrane.

For the test of material moisture permeability, the test methods can be divided into weighing method and sensor method according to the principle. The weighing method uses the humidity difference between the two sides of the moisture-permeable cup to test the moisture permeability of the test piece; the sensor method mainly includes the electrolysis method and the infrared test method, and the electrolysis method uses the relationship between the electrolysis current and water vapor to calculate and pass the test. The water vapor content of the test piece can be obtained to obtain the moisture permeability of the test piece; the basic principle of the infrared test method is that nitrogen with constant humidity and dry nitrogen flow through both sides of the test piece respectively, and water vapor flows from the wet side to the dry test due to the humidity difference. Finally, the carrier gas is sent to the infrared detector to generate an electrical signal, and the water vapor transmission rate of the test piece is calculated through the electrical signal. The three test methods have their own advantages and disadvantages. The weighing method takes a long time to test, is easily disturbed by external factors, and has low accuracy; but its principle and test equipment are simple. The cost of electrolysis and sensor method is high, and the instrument needs to be calibrated regularly, but the test accuracy is high.

It is not difficult to see from the above-mentioned relevant specifications that the above-mentioned relevant specifications for total heat exchangers focus on the performance evaluation of the whole machine, and do not involve the performance test methods and conditions of the total heat exchange membrane. The performance of the total heat exchange membrane can directly affect the efficiency of the static total heat exchanger. However, in the current heat transfer and moisture permeability test specifications for thin sheets, paper and other materials, the two performance test methods are independent of each other and are carried out separately. However, in the actual work of the static total heat exchanger, the total heat exchange membrane performs heat transfer and mass transfer at the same time, and the two interact and influence each other. The evaluation of total heat exchange membranes based on a single index often ignores the coupling effect, which also makes it difficult to compare the advantages and disadvantages of total heat exchange membranes.

Therefore, how to provide a performance testing method, system, medium and equipment of a total heat exchange membrane, so as to solve the defects that the existing technology cannot combine the coupling influence of heat transfer and mass transfer to perform performance evaluation on the total heat exchange membrane, has become an important issue in this field. Technologists urgently need to solve technical problems.

Contents of the invention

In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a performance testing method, system, medium and equipment of a total heat exchange membrane, which is used to solve the problem that the prior art cannot combine the coupling influence of heat transfer and mass transfer. Performance evaluation of total heat exchange membranes.

In order to achieve the above and other related purposes, the present invention provides a method for testing the performance of a total heat exchange membrane. The method for testing the performance of a total heat exchange membrane includes: when a total heat exchange membrane with known thermal resistance is placed When the heat exchange membrane performance testing device is used, the first temperature data within a preset time period is obtained; the error heat transfer value is determined according to the first temperature data; when the total heat exchange membrane to be tested is placed in the total heat exchange membrane performance test When the device is installed, the second temperature data and humidity data within a preset time period are acquired; the total heat exchange film to be tested is a total heat exchange film with unknown thermal resistance; according to the second temperature data, humidity data and error heat transfer value to evaluate the performance of the total heat exchange membrane to be tested.

In an embodiment of the present 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 the expression of the heat transfer coefficient; The error heat transfer value is solved for as the only unknown.

所述第一温度数据包括第一初始温度和不同时刻对应的第一测定温度，所述温差为所述预设时间段内最后时刻的第一测定温度与所述初始温度的差值。In one embodiment of the present invention, the expression of the heat transfer coefficient is:

The first temperature data includes a first initial temperature and corresponding first measured temperatures at different times, and the temperature difference is a difference between the first measured temperature at the last moment in the preset time period and the initial temperature.

In an embodiment of the present invention, the step of evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, humidity data and error heat transfer value includes: combining the second temperature data and error The heat transfer value is used as a known quantity, and the heat transfer coefficient of the total heat exchange film to be tested is determined according to the expression of the heat transfer coefficient; the humidity data is used as a known quantity to determine the described The mass transfer coefficient of the total heat exchange membrane to be tested; using the second temperature data and humidity data as known quantities to determine the enthalpy change curve of the total heat exchange membrane to be tested according to the expression of enthalpy.

所述焓值的表达式为：焓值＝1.01·第二温度数据+(2500+1.84·第二温度数据)·湿度数据。In one embodiment of the present invention, the expression of the mass transfer coefficient is:

The expression of the enthalpy value is: enthalpy value=1.01·second temperature data+(2500+1.84·second temperature data)·humidity data.

In an embodiment of the present invention, the total heat exchange membrane performance testing device includes a cold box and a hot box; evaluate the heat transfer performance of the total heat exchange membrane to be tested according to the heat transfer coefficient; according to the mass transfer The coefficient evaluates the mass transfer performance of the total heat exchange membrane to be tested; determines the air enthalpy value under the initial condition of the total heat exchange membrane to be tested in the box of the cold box or the hot box and the last moment in the preset time period The ratio of the air enthalpy value; among the multiple total heat exchange membranes to be tested, for a cold box, the smaller the ratio, the better the heat and moisture transfer performance of the total heat exchange membrane to be tested; for a hot box, The larger the ratio, the better the heat and moisture transfer performance of the total heat exchange membrane to be tested.

In an embodiment of the present invention, in the process of determining the error heat transfer value, heat transfer coefficient, mass transfer coefficient and enthalpy value, the first temperature data, the second temperature data and the humidity data are performed multiple times The measurements are averaged.

Yet another aspect of the present invention provides a performance testing system for a total heat exchange membrane. The performance testing system for a total heat exchange membrane includes: a first acquisition module, used for when a total heat exchange membrane with known thermal resistance is placed in a total heat exchange When the exchange membrane performance testing device is used, the first temperature data within a preset time period is obtained; the error module is used to determine the error heat transfer value according to the first temperature data; the second acquisition module is used for when the total heat exchange to be tested When the film is placed in the total heat exchange membrane performance testing device, the second temperature data and humidity data within a preset time period are obtained; the total heat exchange film to be tested is a total heat exchange film with unknown thermal resistance; the performance evaluation module , for evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, humidity data and error heat transfer value.

Another aspect of the present invention provides a medium on which a computer program is stored, and when the computer program is executed by a processor, the method for testing the performance of the total heat exchange membrane is realized.

The last aspect of the present invention provides a device, including: a processor and a memory; the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the device executes the overall Performance test methods for heat exchange membranes.

As mentioned above, the performance testing method, system, medium and equipment of the total heat exchange membrane according to the present invention have the following beneficial effects:

(1) Solve the coupling test problem of material heat and mass transfer performance in the existing code; (2) The total heat transfer efficiency of the total heat exchange membrane specimen considering the convective heat transfer is not limited to the specimen itself Thermal conductivity; (3) The test time is short, the test process is simple, and the test results are accurate.

Description of drawings

Fig. 1 shows the front view of the total heat exchange membrane performance testing device applied in the present invention.

Fig. 2 is a top view of the total heat exchange membrane performance testing device applied in the present invention.

FIG. 3 shows a schematic diagram of a total heat exchange membrane fixture in an embodiment of the performance test method of the total heat exchange membrane of the present invention.

Fig. 4 is a schematic diagram of a thermal insulation board of a total heat exchange membrane performance testing device applied in the present invention.

FIG. 5 is a flow chart showing the principle of the performance testing method of the total heat exchange membrane in an embodiment of the present invention.

FIG. 6 is a flow chart showing the performance evaluation of the total heat exchange membrane performance testing method in an embodiment of the present invention.

FIG. 7 is a structural schematic diagram of an embodiment of a performance testing system for a total heat exchange membrane of the present invention.

Fig. 8 is a schematic view showing the structural connection of the performance testing equipment of the total heat exchange membrane in an embodiment of the present invention.

Component designation description

1 first axial fan

2 first damper

3 circulating duct

4 Second damper

5 Second axial fan

6 air pipe

7 Third damper

8 The first humidity recorder

9 kits

10 heating device

11 Temperature self-recorder

12 Second humidity recorder

13 intake pipe

14 exhaust pipe

15 Total heat exchange membrane fixing clip

16 Full heat exchange membrane fixture

17 Total heat exchange membrane

18 insulation board

71 First acquisition module

72 Error Module

73 The second acquisition module

74 performance evaluation module

81 processors

82 memory

83 transceivers

84 communication interface

85 system bus

S51～S54 steps

S541～S543 steps

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also 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 a total heat exchange membrane, and solves the lack of evaluation of total heat exchange membrane materials in the current domestic and foreign standards, considering the impact of air flow on heat transfer. The influence of heat and moisture transfer, and realize the heat and humidity coupling test of the total heat exchange membrane.

The principle and implementation of a performance testing method, system, medium and equipment of a total heat exchange membrane of this embodiment will be described in detail below in conjunction with FIGS. 1 to 8, so that those skilled in the art can understand this embodiment without creative work. The performance test method, system, medium and equipment of the total heat exchange membrane of the example.

Please refer to Fig. 1 to Fig. 3, respectively show the front view of the total heat exchange membrane performance testing device applied in the present invention, the top view of the total heat exchange membrane performance testing device applied in the present invention and the total heat exchange membrane of the present invention The schematic diagram of the total heat exchange membrane fixture in an embodiment of the performance test method. As shown in Figures 1 to 3, the box body of the whole device includes a cold box and a hot box, and a total heat exchange film clamp is connected between the cold box and the hot box, and the full heat exchange film is called a total heat exchange film in a specific embodiment. Membrane specimens, total heat exchange membrane specimens are prepared for heat and humidity performance tests using corresponding test devices as follows: first, open the cover of the test device, and place the total heat exchange membrane specimen 17 with known thermal resistance in the total heat In the exchange membrane clamp 16, and fix it with the total heat exchange membrane fixing clamp 15. Place insulation boards 18 on both sides of the fixture, cover the cover plate, and carry out sealing treatment; secondly, after closing the total heat exchange membrane performance test device, close the first air valve 2 in the circulating air duct 3 on the upper part of the box body, and open the two sides of the box body. The second air valve 4 on the side air pipe 6 and the third air valve 7 on the air intake pipe 13 and the exhaust pipe 14; open the temperature self-recording instrument 11 and the second humidity self-recording instrument 12 on the upper part of the casing; open the exhaust pipe The first humidity self-recorder 8 on the 14; check whether desiccant and water are sufficient in the test kit 9; the 3rd, start the second axial fan 5 in the gas delivery pipe 6, according to the first humidity self-recorder 8 readings, adjust Intake pipe 13 is inserted into the depth of the reagent to control the moisture content in the circulating air until the second humidity self-recording instrument 12 installed in the cabinet shows that the air humidity in the cabinet reaches the initial working condition of the test; the fourth, close the second axial flow fan 5 , the second air valve 4; open the upper heating device 10 switch of the casing, and heat the air inside the casing until the temperature self-recording instrument 11 installed in the casing shows that the air temperature in the casing reaches the test working condition, and closes the heating device 10; Fifth, pull down the insulation board 18, open the first air valve 2 on the circulating air duct 3, and start the first axial flow fan 1. The cabinets of the cold box and the hot box start to transfer heat and humidity through the total heat exchange membrane test piece 17, and the temperature self-recording instrument 11 and the second humidity self-recording instrument 12 record the temperature changes of the two boxes in real time; , record data according to temperature self-recorder 11 and humidity self-recorder 12.

It should be noted that if the unnumbered components in FIGS. 1 to 3 are symmetrically similar to the components with known numbers, the names of the components and the technical functions they perform are the same.

Specifically, the test conditions refer to that the indoor environment of the test room is maintained at 24° C. and the relative humidity is 60% in summer; the indoor environment is maintained at 20° C. and the relative humidity is 60% in winter. Manage the cooling and heating working conditions in a list to form a test working condition table in Table 1.

Table 1. Table of initial working conditions of cold and hot boxes

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 device, the temperature self-recorder 11 measures the first temperature data, when the total heat exchange membrane test piece to be tested When the piece is placed in the total heat exchange membrane performance testing device, the temperature self-recorder 11 measures the second temperature data. The preparation process before the total heat exchange membrane specimen with known thermal resistance and the total heat exchange membrane specimen to be tested is placed on the total heat exchange membrane performance testing device for testing is the same.

Please refer to FIG. 4 , which shows a schematic diagram of the insulation board of the total heat exchange membrane performance testing device applied in the present invention. As shown in FIG. 4 , the insulation board 18 is used to be placed on both sides of the total heat exchange membrane fixture 16 before the test starts, and the heat transfer and moisture transfer of the total heat exchange membrane is prohibited before the test starts.

Please refer to FIG. 5 , which shows a principle flow chart of an embodiment of the performance testing method of the total heat exchange membrane of the present invention. The present invention is proposed based on the principle of heat and mass transfer. In the static total heat exchanger, fresh air and exhaust air flow in different channels, and the heat and mass transfer process is completed through the total heat exchange membrane. Among them, the sensible heat transfer is carried out through the heat conduction of the membrane and the convective heat transfer between the membrane and the fluid on both sides; the latent heat transfer is carried out through the convective mass transfer between the two sides and the membrane and the molecular diffusion inside the membrane.

Since the total heat exchange film of the total heat exchanger is in the heat transfer process, the sources of thermal resistance include convective heat transfer thermal resistance and material heat conduction thermal resistance, and the thermal conductivity of the total heat exchange film cannot reflect its heat transfer performance, and the mass transfer The process will affect the heat transfer process. Therefore, the test device reflects the heat and mass transfer performance of the total heat exchanger film by testing the heat transfer coefficient and mass transfer coefficient.

As shown in Figure 5, the performance testing method of the total heat exchange membrane specifically includes the following steps:

S51, when the total heat exchange film with known thermal resistance is placed in the total heat exchange film performance testing device, acquire first temperature data within a preset time period.

S52. Determine an error heat transfer value according to the first temperature data.

In this embodiment, the first temperature data is substituted into the expression of the heat transfer coefficient as a known quantity; the error heat transfer value is used as the only unknown quantity for solution.

Specifically, the expression of the heat transfer coefficient is:

The first temperature data includes a first initial temperature and corresponding first measured temperatures at different times, and the temperature difference is a difference between the first measured temperature at the last moment in the preset time period and the initial temperature.

In an ideal state, the heat transfer calculation process is:

Assuming that the box is insulated, all heat is transferred from the hot box to the cold box through the total heat exchange membrane, and all the transferred heat is used for air heating of the cold box.

q＝K·A·ΔT formula (1)

In the formula formula (1), q is the total heat exchange membrane heat transfer capacity, the unit is W; K is the total heat exchange membrane heat transfer coefficient, the unit is W/(m ² °C); A is the total heat exchange membrane surface area, The unit is m ² ; ΔT is the temperature difference between the hot and cold boxes, and the unit is ℃; t is the heat exchange time of the hot and cold boxes, and the unit is s.

Perform time integration on both sides of the formula formula (1):

∫q·dt＝∫K·A·ΔT·dt Formula (2)

The temperature difference between the hot and cold boxes is a function of time t:

ΔT＝f(t) Formula (3)

Therefore, the heat Q change of the cold box is:

Q＝c·m·ΔT _n ＝K·A·∫f(t)·dt Formula (4)

Heat transfer coefficient K:

In formula (5), ΔT _n is the difference between the measured temperature and the initial temperature of the cold box, in °C; t ₀ is the time required to reach the measured temperature, in s; c is the specific heat capacity of air at constant volume, in J/(kg· ℃); m is the air mass of the cold box, the unit is kg.

In practice, the change of air temperature in the cold box is not only due to the heat transfer Q ₁ through the total heat exchange membrane, but also related to the heat transfer Q ₂ through the interlayer and the heat transfer Q ₃ between the box and the outside world. Therefore, the heat required to raise the temperature of the cold box is the sum of the three.

Q＝Q ₁ +Q ₂ +Q ₃ ＝c·m·ΔT _n Formula (6)

Use known homogeneous specimens to conduct steady-state measurements with different box wall temperatures, and obtain the relationship between the output heat of the box inner wall resistance and Q ₃ . For a given setup, _Q2 is roughly a function of specimen thickness, specimen thermal resistance, and frame construction. The Q ₂ calibration coefficient is obtained by testing a known homogeneous specimen in a steady state.

S53, when the total heat exchange film to be tested is placed in the total heat exchange film performance testing device, acquire second temperature data and humidity data within a preset time period; the total heat exchange film to be tested is of unknown thermal resistance Full heat exchange membrane.

S54. Evaluate the performance of the total heat exchange membrane to be tested according to the second temperature data, humidity data and error heat transfer value.

Please refer to FIG. 6 , which shows a performance evaluation flow chart of an embodiment of the performance testing method of the total heat exchange membrane of the present invention. As shown in Figure 6, S54 includes:

S541. Using the second temperature data and the error heat transfer value as known quantities, determine the heat transfer coefficient of the total heat exchange film to be tested according to the expression of the heat transfer coefficient.

S542, using the humidity data as a known quantity to determine the mass transfer coefficient of the total heat exchange membrane to be tested according to the 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 humidity between the hot and cold box air is a function of time t:

Δd=g(t) Formula (9)

Therefore, the change of the humidity M of the air in the cold box is:

M＝m·Δd _n ＝K _m ·A·ρ _air ·∫g(t)·dt Formula (10)

The mass transfer coefficient K _m is:

In the formula (8)-(11), K _m is the mass transfer coefficient of the total heat exchange membrane, the unit is m/s; m is the air mass of the cold box, the unit is kg; △d represents the current time point and the next time point The difference between the air humidity of the cold (hot) box, the unit is g/kg (dry air); t ₀ is the time required to reach the measured humidity, the unit is s; Δd _n is the difference between the measured humidity and the initial humidity of the cold box, the unit is g/ kg (dry air); A is the surface area of the total heat exchange membrane, in m ² ; ρ _air is the density of dry air, in kg/m ³ .

It should be noted that there is a slight difference between the air quality of the cold box and the hot box. 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 volume of the box, where , the air density can be known from the common knowledge table, which is a known quantity. After the box is given, the volume of the box is also a known quantity.

S543. Using the second temperature data and humidity data as known quantities, determine an enthalpy change curve of the total heat exchange membrane to be tested according to an expression of enthalpy.

In this embodiment, the expression of the enthalpy value is:

Enthalpy value=1.01·second temperature data+(2500+1.84·second temperature data)·humidity data.

Read the data of the temperature and humidity self-recorder installed in the cold and hot boxes, and obtain the change curve of the air temperature and humidity in the box after the test. Calculate and draw the time-varying curve of the air enthalpy of the cold and hot box, the calculation formula is as follows:

i'＝1.01T'+(2500+1.84T')·d' formula (6)

In the formula (7), i' represents the air enthalpy value, the unit is kJ/kg; T' represents the air temperature, the unit is ℃; d' represents the air moisture content, the unit is kg/kg (dry air).

Specifically, in the performance evaluation process, the total heat exchange membrane performance testing device includes a cold box and a hot box.

The heat transfer performance of the total heat exchange membrane to be tested is evaluated according to the heat transfer coefficient.

The mass transfer performance of the total heat exchange membrane to be tested is evaluated according to the mass transfer coefficient.

Determine the ratio of the air enthalpy value at the initial condition of the total heat exchange film to be tested in the box of the cold box or the hot box to the air enthalpy value at the last moment in the preset time period.

Among the multiple total heat exchange membranes to be tested, for a cold box, the smaller the ratio, the better the heat and moisture transfer performance of the total heat exchange membrane to be tested; for a hot box, the larger the ratio, Then it is judged that the heat and moisture transfer performance of the total heat exchange membrane to be tested is better.

In this embodiment, the preset time period refers to a test period. The calculation process of the test cycle is as follows:

The test period is determined according to the heat transfer time. Assuming that in an ideal state, all heat is transferred through the total heat exchange membrane, the air temperature of the cold box and the hot box are uniform, the air temperature of the hot box is T ₁ , and the air temperature of the cold box is T ₂ .

Total heat exchange membrane transfers heat per unit time:

q＝K·A·ΔT formula (8)

Cold and hot box temperature change:

Integrate formula (12) to get:

In formula (14), ΔT ₀ is the initial temperature difference between the hot and cold tanks, in °C; according to the empirical formula of isothermal fluid laminar heat transfer in a sweeping flat plate, the convective heat transfer coefficient under the total heat exchange membrane length is estimated, and the total heat transfer coefficient is estimated. Exchange membrane heat transfer coefficient K, estimated test time t.

Further, in the process of determining the error heat transfer value, heat transfer coefficient, mass transfer coefficient and enthalpy value, the first temperature data, the second temperature data and humidity data are measured multiple times to obtain an average value.

The performance testing system of the total heat exchange membrane provided by this embodiment will be described in detail below with reference to the diagrams. It should be noted that it should be understood that the division of the various modules of the following systems is only a division of logical functions, and may be fully or partially integrated into a physical entity or physically separated during actual implementation. Moreover, these modules can be implemented in the form of calling software through processing elements, or can be implemented in the form of hardware, or some modules can be implemented in the form of calling software through processing elements, and some modules can be implemented in the form of hardware. For example: a certain module may be a separate processing element, or it may be integrated into a certain chip of the following system. In addition, a certain module may also be stored in the memory of the system described below in the form of program code, and be called by a processing element of the system described below to execute the function of a certain module described below. The implementation of other modules is similar. All or part of these modules can be integrated together, and can also be implemented independently. The processing element mentioned here may be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or the following modules can be completed by an integrated logic circuit of hardware in the processor element or an instruction in the form of software.

The following modules may be one or more integrated circuits configured to implement the above method, for example: one or more specific integrated circuits (Application Specific Integrated Circuit, referred to as ASIC), one or more digital signal processors (Digital Signal Processor , DSP for short), one or more Field Programmable Gate Arrays (Field Programmable Gate Array, FPGA for short), etc. When one of the following modules is implemented in the form of invoking program codes by a processing element, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU for short) or other processors that can invoke program codes. These modules can be integrated together and implemented in the form of a System-on-a-chip (SOC for short).

Please refer to FIG. 7 , which is a structural principle diagram of an embodiment of a performance testing system for a total heat exchange membrane of the present invention. As shown in FIG. 7 , the performance testing system 7 of 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 acquisition module 71 is used to acquire the first temperature data within a preset time period when the total heat exchange film with known thermal resistance is placed in the total heat exchange film performance testing device.

The error module 72 is used for determining an error heat transfer value according to 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 the expression of the heat transfer coefficient; and solve for the error heat transfer value as the only unknown quantity.

所述第一温度数据包括第一初始温度和不同时刻对应的第一测定温度，所述温差为所述预设时间段内最后时刻的第一测定温度与所述初始温度的差值。Specifically, the expression of the heat transfer coefficient is:

The first temperature data includes a first initial temperature and corresponding first measured temperatures at different times, and the temperature difference is a difference between the first measured temperature at the last moment in the preset time period and the initial temperature.

The second acquisition module 73 is used to acquire 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 exchange membrane is a total heat exchange membrane with unknown thermal resistance.

The performance evaluation module 74 is used for evaluating the performance of the total heat exchange membrane to be tested according to the second temperature data, humidity data and error heat transfer value.

In this embodiment, the performance evaluation module 74 is specifically configured to use the second temperature data and the error heat transfer value as known quantities, and determine the total heat exchange membrane to be tested according to the expression of the heat transfer coefficient The heat transfer coefficient of said humidity data is determined according to the expression of mass transfer coefficient according to said humidity data as known quantity; The said second temperature data and humidity data are regarded as known quantity according to The expression of the enthalpy determines the enthalpy change curve of the total heat exchange membrane to be tested.

所述焓值的表达式为：焓值＝1.01·第二温度数据+(2500+1.84·第二温度数据)·湿度数据。Specifically, the expression of the mass transfer coefficient is:

The expression of the enthalpy value is: enthalpy value=1.01·second temperature data+(2500+1.84·second temperature data)·humidity data.

Specifically, the total heat exchange membrane performance testing device includes a cold box and a hot box; the performance evaluation module 74 is used to evaluate the heat transfer performance of the total heat exchange membrane to be tested according to the heat transfer coefficient; according to the The mass transfer coefficient evaluates the mass transfer performance of the total heat exchange membrane to be tested; determines the air enthalpy value of the total heat exchange membrane to be tested in the box of the cold box or the hot box under the initial condition and the preset time period The ratio of the air enthalpy value at the last moment; among the multiple total heat exchange membranes to be tested, for a cold box, the smaller the ratio, the better the heat and moisture transfer performance of the total heat exchange membrane to be tested; The larger the ratio, the better the heat and moisture transfer performance of the total heat exchange membrane to be tested.

This embodiment provides a computer storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for testing the performance of the total heat exchange membrane is realized.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by hardware related to computer programs. The aforementioned computer program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiments; and the aforementioned computer-readable storage medium includes: ROM, RAM, magnetic disk or optical disk and other computer storage media that can store program codes.

Please refer to FIG. 8 , which is a schematic structural connection diagram of an embodiment of the performance testing equipment of the total heat exchange membrane of the present invention. As shown in FIG. 8 , the present embodiment provides a device 8, which includes: a processor 81, a memory 82, a transceiver 83, a communication interface 84 or/and a system bus 85; the memory 82 and the communication interface 84 pass through the system The bus 85 is connected with the processor 81 and the transceiver 83 and completes mutual communication, the memory 82 is used to store computer programs, the communication interface 84 is used to communicate with other devices, the processor 81 and the transceiver 83 are used to run the computer programs, The equipment is made to execute each step of the performance testing method of the total heat exchange membrane.

The system bus 85 mentioned above may be a Peripheral Component Interconnect (PCI for short) bus or an Extended Industry Standard Architecture (EISA for short) bus or the like. The system bus 85 can be divided into address bus, data bus, control bus and so on. The communication interface is used to realize the communication between the database access device and other devices (such as client, read-write library and read-only library). The memory may include a random access memory (Random Access Memory, RAM for short), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

Above-mentioned processor 81 can be general-purpose processor, comprises central processing unit (Central Processing Unit, be called for short CPU), network processor (Network Processor, be called for short NP) etc.; Can also be digital signal processor (Digital Signal Processing, be called for short DSP), ASIC (Scan application Specific Integrated Circuit, referred to as ASIC), Field Programmable Gate Array (Field Programmable Gate Array, referred to as FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

The scope of protection of the performance test method of the total heat exchange membrane described in the present invention is not limited to the execution order of the steps listed in this embodiment, any scheme realized by adding or subtracting steps or replacing steps in the prior art according to the principle of the present invention All are included in the scope of protection of the present invention.

The present invention also provides a performance testing system of a total heat exchange membrane, which can realize the performance testing method of a total heat exchange membrane described in the present invention, but the total heat exchange membrane described in the present invention The device for realizing the performance test method of the membrane includes but is not limited to the structure of the performance test system of the total heat exchange membrane listed in this embodiment. within the scope of protection of the invention.

In summary, the performance testing method, system, medium and equipment of the total heat exchange membrane described in the present 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 , to solve the lack of evaluation of total heat exchange membrane materials in the current domestic and foreign standards, consider the influence of air flow on heat transfer and moisture transfer, and realize the heat and humidity coupling test of total heat exchange membranes. It solves the coupling test problem of heat and mass transfer performance of materials in the existing specifications; the total heat transfer efficiency of the total heat exchange membrane specimen, including convective heat transfer, is not limited to the thermal conductivity of the specimen itself; the test time is short , the test process is simple and the test results are accurate. The invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still 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.

Images