Door seal heat leakage testing method and door seal heat leakage testing device

Abstract

The invention provides a door seal heat leakage test method and a door seal heat leakage test device, the door seal heat leakage test method is used for testing a refrigeration device with a VIP board, and the door seal heat leakage test method comprises the following steps: S1, setting a heating device to heat in the refrigeration device, and collecting the heating value Q1 of the heating device in the unit of W; s2, the heat exchange amount Q2 of the refrigeration device is calculated, and the unit is W; q < 2 > is equal to Q < 21 > + Q < 22 >; q21 is the heat exchange amount of a first area of the area with the VIP board, and the unit is W; q22 is the heat exchange amount of the second area of the area without the VIP board, and the unit is W; and S3, the door seal heat leakage Q3 is calculated, the unit is W, and Q3 = Q1-Q2. According to the method, the area with the VIP board and the area without the VIP board are calculated separately, and a more accurate calculation mode of door seal heat leakage is achieved.

Description

Technical Field

[0001] The present application relates to the field of heat load testing, and in particular to a door seal heat leakage testing method and a door seal heat leakage testing device. Background Art

[0002] In recent years, the domestic cold chain market has developed rapidly, but the quality of the matching refrigerated containers is uneven, the door seal heat leakage is large and exceeds the required range, and the refrigeration unit is matched with the refrigerated container with large door seal heat leakage. It will affect the cooling time and low-temperature performance of the refrigeration unit, resulting in slow cooling or substandard temperature control. In related technologies, the heat leakage coefficient of the refrigerated container is calibrated and tested in the laboratory according to standard requirements.

[0003] VIP board (vacuum insulation panel) is a kind of vacuum insulation material, which is composed of a filling core material and a vacuum protective surface layer. It effectively avoids heat transfer caused by air convection, so the thermal conductivity can be greatly reduced. VIP board is now used in various refrigerators or refrigeration devices. However, in the process of measuring the heat leakage of door seals of various refrigeration devices, the influence of VIP board is not included in the discussion, which will lead to large errors in the structure. Summary of the invention

[0004] The present application provides a door seal heat leakage test method and a door seal heat leakage test device, which can achieve more accurate calculation of the door seal heat leakage of a refrigeration device with a VIP panel.

[0005] Specifically, the present invention is achieved through the following technical solutions:

[0006] A door seal heat leakage test method, used for testing a refrigeration device with a VIP panel, comprising:

[0007] Step S1: Setting a heating device to generate heat inside the refrigeration device, and collecting the heat Q generated by the heating device 1 , unit is W;

[0008] Step S2: Calculate the heat exchange capacity Q of the refrigeration device 2 , unit is W;

[0009] Q 2 =Q 21 +Q 22 ;

[0010] Q 21 is the heat exchange capacity of the first area of ​​the area having the VIP panel, in W;

[0011] Q 22 is the heat exchange capacity of the second area without the VIP panel, in W;

[0012] Step S3: Calculate the door seal heat leakage Q3 , unit is W, Q 3 =Q 1 -Q 2 .

[0013] Furthermore, in the first region, the VIP plate is disposed between the inner polyurethane plate and the outer polyurethane plate, and the heat exchange rate of the first region is calculated as Q 21 =a 1 *k 1 *Δt;

[0014] k 1 =1 / (1 / h in +δ 0 / λ 0 +δ 1 / λ 1 +δ 2 / λ 1 +1 / h out );

[0015] in,

[0016] a 1 is the area of ​​the first region, in m 2 ;

[0017] k 1 is the heat transfer coefficient of the first region, in W / (m 2 *K);

[0018] Δt is the temperature difference between the inside and outside of the refrigeration device, in °C;

[0019] h in is the internal convection heat transfer coefficient of the refrigeration device, in W / (m 2 *K);

[0020] δ 0 is the thickness of the VIP plate, in m;

[0021] λ 0 is the thermal conductivity of the VIP plate, in W / (m*K);

[0022] δ 1 is the thickness of the inner polyurethane board, in m;

[0023] δ 2 is the thickness of the outer polyurethane board, in m;

[0024] λ 1 is the thermal conductivity of the polyurethane board, in W / (m*K);

[0025] h outis the external convection heat transfer coefficient of the refrigeration device, in W / (m 2 *K).

[0026] Furthermore, the calculation formula for the heat exchange capacity of the second region is Q 22 =a 2 *k 2 *Δt;

[0027] k 2 =1 / (1 / h in +δ 3 / λ 1 +1 / h out ).

[0028] in,

[0029] a 2 is the area of ​​the second region, in m 2 ;

[0030] k 2 is the heat transfer coefficient of the second region, in W / (m 2 *K);

[0031] δ 3 is the thickness of the second region, in m.

[0032] A door seal heat leakage test device is used to implement the above-mentioned door seal heat leakage test method, the door seal heat leakage test device includes a heating device, which also includes: a detection unit and a control unit, the heating device is arranged inside the refrigeration device, the control unit is arranged outside the refrigeration device, the control unit controls the power of the heating device, the detection unit includes an internal detection unit and an external detection unit, the internal detection unit is installed in the refrigeration device and detects the temperature inside the refrigeration device, and the external detection unit is installed on the control unit and detects the temperature outside the refrigeration device.

[0033] Furthermore, the heating device comprises: a heating wire and a fan, the heating wire is arranged obliquely, and the fan is arranged on one side of the heating wire.

[0034] Furthermore, the heating device also includes: a mounting frame, the heating wire is mounted in the mounting frame, the fan is arranged on one side of the mounting frame, and ventilation holes are opened on the other side and the upper end of the mounting frame to form an air flow channel from the ventilation holes to the fan.

[0035] Furthermore, the internal detection unit includes a plurality of internal temperature sensors, and the external detection unit includes a plurality of external temperature sensors. A portion of the internal temperature sensors are connected to the heating device, and another portion of the internal temperature sensors are distributed at various locations inside the refrigeration device. The external temperature sensors are connected to the control unit.

[0036] Furthermore, the control unit is provided with a power meter, a temperature controller and a potentiometer, the power meter detects the power of the heating device; the temperature controller is respectively connected to the internal temperature sensor and the external temperature sensor, and the temperature controller displays the average value of the temperatures detected by several internal temperature sensors, the preset heating temperature inside the refrigeration device, and the temperature difference between the inside and outside of the refrigeration device.

[0037] Furthermore, the potentiometer controls a preset heating temperature inside the refrigeration device, and the potentiometer controls the start and stop of the heating device.

[0038] Furthermore, the control unit is provided with a connection port, and the control unit is connected to the heating device and the detection unit through the connection port.

[0039] The present invention calculates the area with the VIP panel and the area without the VIP panel separately, thereby realizing a more accurate calculation method for the heat leakage of the door seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the present invention.

[0041] Figure 2 Schematic diagram of the heating device of the present invention.

[0042] Explanation of the accompanying drawings: 1. Heating device; 2. Detection unit; 3. Control unit; 11. Heating wire; 12. Fan; 13. Mounting frame; 31. Power meter; 32. Temperature controller; 33. Potentiometer; 34. Connection port; 35. Universal wheel.

[0043] Specific implementation methods

[0044] Exemplary implementations are described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary implementations do not represent all implementations consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0045] The terms used in this application are only for the purpose of describing a specific implementation method, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0046] A door seal heat leakage test method, used for testing a refrigeration device with a VIP panel, comprising:

[0047] Step S1: Set the heating device 1 to generate heat inside the refrigeration device, and collect the heat value Q of the heating device 1 1 , unit is W;

[0048] Step S2: Calculate the heat exchange capacity Q of the refrigeration device 2 , unit is W;

[0049] Q 2 =Q 21 +Q 22 ;

[0050] Q 21 is the heat transfer capacity of the first area of ​​the area with VIP panels, in W;

[0051] Q 22 is the heat transfer capacity of the second area without the VIP plate, in W;

[0052] Step S3: Calculate the door seal heat leakage Q 3 , unit is W, Q 3 =Q 1-Q 2 .

[0053] Furthermore, in the first region, the VIP plate is arranged between the inner polyurethane plate and the outer polyurethane plate, and the heat exchange rate of the first region is calculated as Q 21 =a 1 *k 1 *Δt;

[0054] k 1 =1 / (1 / h in +δ 0 / λ 0 +δ 1 / λ 1 +δ 2 / λ 1 +1 / h out );

[0055] in,

[0056] a 1 is the area of ​​the first region, in m 2 ;

[0057] k 1 is the heat transfer coefficient of the first region, in W / (m 2 *K);

[0058] Δt is the temperature difference between the inside and outside of the refrigeration unit, in °C;

[0059] h in is the internal convection heat transfer coefficient of the refrigeration device, in W / (m 2 *K);

[0060] δ 0 is the thickness of the VIP board, in m;

[0061] λ 0 is the thermal conductivity of the VIP board, in W / (m*K);

[0062] δ 1 is the thickness of the inner polyurethane board, in m;

[0063] δ 2 is the thickness of the outer polyurethane board, in m;

[0064] λ 1 is the thermal conductivity of the polyurethane board, in W / (m*K);

[0065] h out is the external convection heat transfer coefficient of the refrigeration device, in W / (m 2 *K).

[0066] When the thickness of the inner polyurethane plate and the outer polyurethane plate is the same, the heat transfer coefficient of the first zone is calculated as K a =1 / (1 / h in +δ 0 / λ 0 +2δ 1 / λ 1 +1 / h out ).

[0067] Furthermore, the heat transfer formula of the second area is Q 22 =a 2 *k 2 *Δt;

[0068] k 2 =1 / (1 / h in +δ 3 / λ 1 +1 / h out ).

[0069] in,

[0070] a 2 is the area of ​​the second region, in m 2 ;

[0071] k 2 is the heat transfer coefficient of the second region, in W / (m 2 *K);

[0072] δ 3 is the thickness of the second region, in m.

[0073] It is worth noting that the second area, ie the area without the VIP board, is composed of a polyurethane board.

[0074] In a preferred embodiment, a refrigeration device with an area of ​​0.45 m 2 The area of ​​the first area is 0.25m 2 ; The area of ​​the second area is 0.2m 2 The temperature difference between the inside and outside of the refrigeration device is set to 50°C; the convection heat transfer coefficient inside the refrigeration device is 15W / (m 2 *K); the external convection heat transfer coefficient of the refrigeration device is 9W / (m 2 *K);

[0075] The thickness of the VIP plate in the first area is 0.01 m; the thermal conductivity of the VIP plate is 0.007 W / (m*K);

[0076] The thickness of the inner polyurethane board and the outer polyurethane board in the first area are both 0.03 m; the thermal conductivity of the polyurethane board is 0.02 W / (m*K);

[0077] The thickness of the polyurethane board in the second area is the same as the overall thickness of the inner polyurethane board, the outer polyurethane board and the VIP board, which is 0.07m

[0078] Therefore, the heat transfer coefficient of the first zone is K a =1 / (1 / 15+0.01 / 0.007+2*0.03 / 0.02+1 / 9)≈0.22W / (m 2 *K);

[0079] The heat transfer coefficient of the second region is K b =1 / (1 / 15+0.07 / 0.02+1 / 9)≈0.27W / (m 2 *K);

[0080] Without calculating the VIP plate, the heat transfer coefficient and K 2 Consistency;

[0081] Furthermore, in the case of calculating the VIP panel, the heat exchange capacity of the refrigeration device is Q a =A a1 *K a1 *Δt+A a2 *K a2 *Δt=0.25*0.22*50+0.2*0.27*50=5.45W;

[0082] Furthermore, without taking into account the VIP panel, the heat exchange capacity of the refrigeration device is Q b =A b *K b *Δt=(0.2+0.25)*0.27*50=6.075W;

[0083] According to the calculation method of door seal heat leakage, the difference between calculating VIP plate and not calculating VIP plate is Q a and Q b The difference.

[0084] Therefore, every 0.45m 2 Whether or not the VIP board is included will result in a difference of 0.625W.

[0085] See also Figure 1 As shown, a door seal thermal leakage test device includes a heating device 1, a detection unit 2 and a control unit 3. The heating device 1 is arranged inside the refrigeration device, and the control unit 3 is arranged outside the refrigeration device. The control unit 3 controls the heating power of the heating device 1. The detection unit 2 includes an internal detection unit and an external detection unit. The internal detection unit is installed in the refrigeration device and detects the temperature inside the refrigeration device, and the external detection unit is installed on the control unit 3 and detects the temperature outside the refrigeration device.

[0086] The internal detection unit includes several internal temperature sensors, and the external detection unit includes several external temperature sensors. Some of the internal temperature sensors are connected to the heating device 1 and the control unit, and the other part of the internal temperature sensors are distributed in various places inside the refrigeration device and are also connected to the control unit. When calculating the internal temperature of the refrigeration device, the average value of all the internal temperature sensors is collected; the external temperature sensor is connected to the control unit 3.

[0087] The control unit 3 is provided with a power meter 31, a temperature controller 32 and a potentiometer 33. The power meter 31 detects the power of the heating device 1; the temperature controller 32 is connected to the internal temperature sensor and the external temperature sensor respectively, and the temperature controller 32 displays the average value of the temperatures detected by several internal temperature sensors, the preset heating temperature inside the refrigeration device, and the temperature difference between the inside and outside of the refrigeration device.

[0088] The potentiometer 33 controls the preset heating temperature inside the refrigeration device, and the potentiometer 33 controls the start and stop of the heating device 1; a connection port 34 is provided on the control unit 3, and the control unit 3 is connected to the heating device 1 and the detection unit 2 through the connection port 34; a universal wheel 35 is provided at the bottom of the control unit 3, which can facilitate the user to push back and forth, and the device can be used in any scenario.

[0089] See also Figure 2 As shown, the heating device 1 includes: a heating wire 11 and a fan 12, the heating wire 11 is arranged at an angle, the fan 12 is arranged on one side of the heating wire 11, and an angle is formed between the heating wire 11 and the fan 12, so that the area of ​​the heating wire directly facing the fan is increased, which facilitates the heat generated by the heating wire to be dispersed to various places inside the refrigeration device; the heating device 1 also includes: a mounting frame 13, the heating wire 11 is installed in the mounting frame 13, the fan 12 is arranged on one side of the mounting frame 13, and the other side and the upper end of the mounting frame 13 are provided with vents, and an air flow channel is formed from the vents to the fan 12.

[0090] Those skilled in the art will readily appreciate other embodiments of the specification after considering the specification and practicing the invention claimed herein. The specification is intended to cover any variations, uses or adaptations of the specification that follow the general principles of the specification and include common knowledge or customary techniques in the art that are not claimed in the specification. The specification and examples are to be considered exemplary only, and the true scope and spirit of the specification are indicated by the following claims.

[0091] The above are only preferred embodiments of this specification and are not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A door seal heat leakage test method for testing a refrigeration device with a VIP panel. include: Step S1: Setting a heating device to generate heat inside the refrigeration device, and collecting the heat Q generated by the heating device 1 , unit is W; Step S2: Calculate the heat exchange capacity Q of the refrigeration device 2 , unit is W; Q 2 =Q 21 +Q 22 ; Q 21 is the heat exchange capacity of the first area of ​​the area having the VIP panel, in W; Q 22 is the heat exchange capacity of the second area without the VIP panel, in W; Step S3: Calculate the door seal heat leakage Q 3 , unit is W, Q 3 =Q 1 -Q 2 .

2. The door seal thermal leakage testing method according to claim 1, It is characterized in that In the first region, the VIP plate is arranged between the inner polyurethane plate and the outer polyurethane plate. The heat exchange formula of the first region is Q 21 =a 1 *k 1 *△t; k 1 =1 / (1 / h in +d 0 / l 0 +d 1 / l 1 +d 2 / l 1 +1 / hour out ); in, a 1 is the area of ​​the first region, in m 2 ; k 1 is the heat transfer coefficient of the first region, in W / (m 2 *K); △t is the temperature difference between the inside and outside of the refrigeration device, in °C; h in is the internal convection heat transfer coefficient of the refrigeration device, in W / (m 2 *K); δ 0 is the thickness of the VIP plate, in m; λ 0 is the thermal conductivity of the VIP plate, in W / (m*K); δ 1 is the thickness of the inner polyurethane plate, in m; δ 2 is the thickness of the outer polyurethane plate, in m; λ 1 is the thermal conductivity of the polyurethane board, in W / (m*K); h out is the external convection heat transfer coefficient of the refrigeration device, in W / (m 2 *K).

3. The door seal thermal leakage testing method according to claim 1, It is characterized in that The calculation formula for the heat exchange of the second area is Q 22 =a 2 *k 2 *△t; k 2 =1 / (1 / h in +d 3 / l 1 +1 / hour out )。 in, a 2 is the area of ​​the second region, in m 2 ; k 2 is the heat transfer coefficient of the second region, in W / (m 2 *K); δ 3 is the thickness of the second region, in m.

4. A door seal thermal leakage test device, used to implement the door seal thermal leakage test method according to any one of claims 1 to 3, the door seal thermal leakage test device comprising a heating device, It is characterized in that Also includes: A detection unit and a control unit, wherein the heating device is arranged inside the refrigeration device, and the control unit is arranged outside the refrigeration device. The control unit controls the power of the heating device. The detection unit includes an internal detection unit and an external detection unit. The internal detection unit is installed in the refrigeration device and detects the temperature inside the refrigeration device, and the external detection unit is installed on the control unit and detects the temperature outside the refrigeration device.

5. The door seal thermal leakage testing device according to claim 4, It is characterized in that The heating device comprises: a heating wire and a fan, the heating wire is arranged obliquely, and the fan is arranged on one side of the heating wire.

6. The door seal thermal leakage testing device according to claim 5, It is characterized in that The heating device also includes: a mounting frame, the heating wire is mounted in the mounting frame, the fan is arranged on one side of the mounting frame, and ventilation holes are opened on the other side and the upper end of the mounting frame to form an air flow channel from the ventilation holes to the fan.

7. The door seal thermal leakage testing device according to claim 4, It is characterized in that The internal detection unit includes a plurality of internal temperature sensors, and the external detection unit includes a plurality of external temperature sensors. A portion of the internal temperature sensors are connected to the heating device, and another portion of the internal temperature sensors are distributed in various locations inside the refrigeration device. The external temperature sensors are connected to the control unit.

8. The door seal thermal leakage testing device according to claim 7, It is characterized in that The control unit is provided with a power meter, a temperature controller and a potentiometer. The power meter detects the power of the heating device. The temperature controller is connected to the internal temperature sensor and the external temperature sensor respectively. The temperature controller displays the average value of the temperatures detected by several internal temperature sensors, the preset heating temperature inside the refrigeration device and the temperature difference between the inside and outside of the refrigeration device.

9. The door seal thermal leakage testing device according to claim 8, It is characterized in that The potentiometer controls the preset heating temperature inside the refrigeration device, and the potentiometer controls the start and stop of the heating device.

10. The door seal thermal leakage testing device according to claim 4, It is characterized in that The control unit is provided with a connection port, and the control unit is connected to the heating device and the detection unit through the connection port.

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