Device and method for detecting heat transfer performance of three-dimensional building space enclosure body

Abstract

The invention relates to the technical field of enclosure body heat transfer performance detection, in particular to a three-dimensional building space enclosure body heat transfer performance detection device and method.A protective layer, a metering layer, a temperature control layer and a cold box are connected with different end faces of a test piece support frame respectively, so that the test piece support frame provides a hot environment or a cold environment for a test piece in different directions; therefore, a three-dimensional heat exchange space is formed in the test piece support frame, a required heat transfer surface is provided for the test piece according to the actual environment of the building space enclosure body, and the heat transfer performance of the building space enclosure body is detected. Meanwhile, the test piece support frame provides a detection environment for the test piece, the shape and size of the test piece can be changed according to the actual structural shape of the building space enclosure body, and the positions and sizes of the metering box, the protection box and the cold box do not need to be independently adjusted, so that the detection difficulty and cost are reduced, and the detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat transfer performance detection of enclosures, and in particular to a device and method for detecting heat transfer performance of enclosures of three-dimensional building spaces. Background Art

[0002] The energy consumption of heating, ventilation and air-conditioning systems is the main source of building energy consumption. Building thermal design is the fundamental way to reduce the energy consumption of heating and air-conditioning systems.

[0003] Building thermal design usually only targets the enclosure structure, while the building space enclosure is located between the heated or air-conditioned room and the outdoor environment. It is a composite structure composed of the outer enclosure structure in contact with the outdoor environment, the inner enclosure structure adjacent to the heated or air-conditioned room, and the uncontrolled building space between the enclosure structures on both sides. Typical forms of building space enclosures include rectangular balconies, narrow corridors, vertical stairwells, and inclined attics.

[0004] The heat transfer of these space enclosures not only includes the solid heat transfer of the enclosure structure, but also involves the heat transfer of the air inside the three-dimensional building space; although the detection technology for the heat transfer performance of the enclosure structure is relatively mature, for example, the Chinese invention patent application with application number 202411023277.6 provides a thermal resistance and heat transfer coefficient detection device for building wall materials and a detection method thereof, which uses a hot box and a cold box to close to the opposite sides of the test piece to complete the detection of the thermal resistance and heat transfer coefficient of the building wall materials.

[0005] However, the existing solutions have the following shortcomings: 1. The traditional detection method is based on one-dimensional heat transfer and is only applicable to the heat transfer research of solid enclosure structures whose thickness is much smaller than the height and width; but it is not applicable to the three-dimensional air heat transfer performance detection of building space enclosures; 2. The heat transfer surface of the traditional detection method is fixed and has only two surfaces, that is, one side of the test piece is a cold box and the other side is a hot box; however, the three-dimensional enclosure has multiple hot and cold surfaces for combined heat transfer, and the heat transfer direction is diverse, which directly affects the air heat transfer performance, resulting in unreliable test results; 3. In traditional testing methods, the thickness of the specimen can be changed, but the surface area size remains fixed. However, the dimensions in all directions of the space enclosure may have a significant impact on the air heat transfer performance, further reducing the accuracy and reliability of the test results. Summary of the invention

[0006] The purpose of the present invention is to provide a device and method for detecting the heat transfer performance of a three-dimensional building space enclosure, so as to solve the current technical problem of unreliable heat transfer detection of a building space enclosure.

[0007] The present invention solves the above-mentioned technical problems by: A three-dimensional building space enclosure heat transfer performance testing device comprises a protective layer, a metering layer, a cold box, a temperature control layer and a test piece support frame for accommodating a test piece; The specimen holder frame has four side end faces, and the four side end faces are sequentially provided with a protective layer, a protective layer, a temperature control layer and a cold box. The top end face of the specimen holder frame is provided with a temperature control layer, and the bottom end face of the specimen holder frame is provided with a protective layer. The metering layer is provided inside the protective layer, and the protective layer, metering layer, cold box and temperature control layer are all connected to the inside of the specimen holder frame.

[0008] It is further defined that the protective layer includes a plurality of protective boxes arranged in an array, and the metering layer includes a plurality of metering boxes; a protective box is arranged on the outside of each metering box, and the metering boxes are connected to the protective boxes, and the heat dissipation surface of the metering boxes faces the inside of the specimen holder frame.

[0009] It is further defined that a clamping buffer is provided on the back of the metering box, and a guide block is provided on the peripheral side of the metering box; The metering box is movably connected to the protection box through a clamping buffer; the inner wall of the protection box is provided with a guide track, the guide track is arranged along the thickness direction of the metering box, and the metering box is slidably connected to the guide track through a guide block.

[0010] It is further defined that the metering box is also provided with a guide plate, a first temperature sensor and a second temperature sensor; The guide plate is arranged on the heat dissipation surface of the metering box; the first temperature sensor is arranged on the outer wall of the guide plate, and the second temperature sensor is arranged on the inner wall and the outer wall of the metering box respectively.

[0011] It is further defined that the temperature control layer includes a plurality of temperature control boxes, and the plurality of temperature control boxes are arranged in an array.

[0012] It is further defined that the bottom of the cold box on the side of the specimen holder frame, the bottom of the temperature control layer and the bottom of the two protective layers are all provided with support pads, and the bottom of the support pads are all provided with slide rails, and the slide rails are slidably connected to the support pads, and the slide rails are all located on the peripheral side of the specimen holder frame.

[0013] It is further defined that the protective layer, the cold box and the temperature control layer are all sealed to the specimen support frame via sealing strips.

[0014] It is further defined that the three-dimensional building space enclosure heat transfer performance detection device also includes a thermal insulation baffle, which is arranged inside the specimen holder frame, and the thermal insulation baffle is detachably connected to the specimen holder frame, and the thermal insulation baffle forms a temperature control channel around the specimen and the temperature control box and / or the protective box.

[0015] A method for detecting heat transfer performance of a three-dimensional building space enclosure is based on the above-mentioned three-dimensional building space enclosure heat transfer performance detection device, comprising the following steps: S1. Determine the size of the specimen, the internal space size of the specimen, and the heat transfer surface of the specimen according to the environment of the target building space enclosure; S2, casting the specimen in the specimen support frame, and setting a specimen temperature sensor on the inner wall of the specimen; S3. According to the heat transfer surface of the test piece, determine the protection box, metering box and temperature control box that need to be opened; S4. The protective layer, the cold box and the temperature control layer are all sealed and connected to the end surface of the specimen support frame; S5. Start the cold box, protection box, metering box and temperature control box, and calculate the heat transfer performance of the internal space of the specimen.

[0016] It is further defined that step S5 comprises the following steps: S5.1. Calculate the heat transfer coefficient of the specimen heating surface based on the surface temperature of the specimen heating surface and the heating temperature of the specimen heating surface. ;

[0017]

[0018] in, is the sum of the power of the metering boxes corresponding to the heated surface of the specimen, is the area of ​​the heated surface of the specimen, is the temperature of the thermal environment of the specimen’s heated surface, is the surface temperature of the heated surface of the specimen; S5.2, according to the heat transfer coefficient of the heated surface of the specimen Calculate the heat transfer coefficient of the specimen's heat dissipation surface ;

[0019]

[0020] in, is the cold environment temperature of the heat dissipation surface of the specimen, is the surface temperature of the heat dissipation surface of the specimen; S5.3. Heat transfer coefficient of the heat dissipation surface of the specimen and the heat transfer coefficient of the heated surface of the specimen , the heat transfer coefficient of the internal space of the specimen is obtained ;

[0021]

[0022]

[0023] in, is the heat flux density of the heated surface of the specimen.

[0024] The beneficial effects of the present invention are: 1. The present invention utilizes a protective layer, a metering layer, a temperature control layer and a cold box to be connected to different end faces of a specimen support frame respectively, so that the specimen support frame provides a hot environment or a cold environment for the specimen in different directions, and forms a three-dimensional heat exchange space inside the specimen support frame. According to the actual environment of the building space enclosure, the required heat transfer surface is provided for the specimen, and the heat transfer performance test of the building space enclosure is realized; at the same time, the specimen support frame provides a test environment for the specimen, and the specimen can change its shape and size according to the actual structural shape of the building space enclosure. The positions and sizes of the metering box, the protective box and the cold box do not need to be adjusted separately, thereby reducing the difficulty and cost of detection and improving the detection efficiency.

[0025] 2. The present invention utilizes multiple protection boxes and multiple metering boxes to provide a hot environment, utilizes a cold box to provide a cold environment, and utilizes multiple temperature control boxes to provide a hot environment or a cold environment. It is flexible and adjustable, so that the heat transfer surface of the specimen and the temperature of the corresponding heat transfer surface can be adjusted more accurately, thereby improving the detection accuracy and reliability of the heat transfer performance of the building space enclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the heat transfer performance detection device for three-dimensional building space enclosure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the heat transfer performance detection device for three-dimensional building space enclosure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the device for detecting the heat transfer performance of a three-dimensional building space enclosure according to Example 1 of the present invention; Figure 4 This is a schematic diagram of the internal structure of a device for detecting heat transfer performance of a three-dimensional building space enclosure according to Example 2 of the present invention; Figure 5 This is a schematic diagram of the internal structure of a device for detecting heat transfer performance of a three-dimensional building space enclosure according to Example 3 of the present invention; Figure 6 This is a schematic diagram of the internal structure of another device for detecting the heat transfer performance of a three-dimensional building space enclosure according to Embodiment 3 of the present invention; In the figure, 100, specimen support frame; 200, protective layer; 210, protective box; 300, metering layer; 310, metering box; 311, clamping buffer; 312, guide block; 313, guide rail; 320, guide plate; 330, metering box heater; 400, cold box; 500, temperature control layer; 510, temperature control box; 600, support pad; 610, slide rail; 620, sealing strip; 700, thermal insulation baffle; 800, specimen. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] refer to Figure 1 and Figure 2 The present invention provides a three-dimensional building space enclosure heat transfer performance detection device, including a specimen support frame 100, a protective layer 200, a metering layer 300, a cold box 400 and a temperature control layer 500; wherein the interior of the specimen support frame 100 is used to accommodate a specimen 800, the size of the specimen 800 is smaller than the internal size of the specimen support frame 100, and the size and shape of the specimen 800 can be adjusted according to demand.

[0029] The protective layer 200 is sleeved on the outside of the metering layer 300, and the metering layer 300 passes through the protective layer 200 and is connected to the inside of the specimen holder frame 100; the number of protective layers 200 is preferably three, and the number of metering layers 300 is the same as the number of protective layers 200. The three protective layers 200 are respectively connected to the three end faces of the specimen holder frame 100, and the three protective layers 200 are arranged adjacent to each other. The protective layers 200 are respectively arranged on the left end face, rear end face and bottom end face of the specimen holder frame 100 as an example for explanation; at this time, the metering layer 300 is arranged inside the corresponding protective layer 200.

[0030] The metering layer 300 can provide heat to form a stable thermal environment at the end face corresponding to the specimen holder frame 100; the metering layer 300 can also record the amount of total heat provided; the protective layer 200 is used to provide a stable ambient temperature for the outside of the metering layer 300 to prevent the external environment from affecting the detection accuracy and reliability of the metering layer 300.

[0031] The cold box 400 and the temperature control layer 500 are both connected to the corresponding end faces of the specimen holder frame 100. The total number of cold boxes 400 and the number of temperature control layers 500 is three. The number of cold boxes 400 can be determined according to the actual building space enclosure. In order to reduce the usage of cold boxes 400 and to more conveniently adjust the temperature control of the remaining end faces of the specimen holder frame 100, it is preferred that the number of cold boxes 400 is one and the number of temperature control layers 500 is two.

[0032] The temperature control layer 500 can be used as a cold box 400 to provide a cold environment, and can also be used as a protective layer 200 to provide a hot environment. Taking the cold box 400 connected to the right end face of the specimen holder frame 100 as an example, at this time, the top end face and the front end face of the specimen holder frame 100 are both connected to the temperature control layer 500.

[0033] According to the number of cold surfaces and the number of hot surfaces in the actual building space enclosure environment and the positions of the cold surfaces and the hot surfaces, it is determined whether the two temperature control layers 500 provide a hot environment or a cold environment.

[0034] It should be noted that the protective layer 200 , the cold box 400 and the temperature control layer 500 are all sealed and connected to the outer surface of the specimen holder frame 100 , so as to prevent the external environment from affecting the internal temperature of the specimen holder frame 100 .

[0035] Example 1 refer to Figure 3 In the three-dimensional building space enclosure heat transfer performance detection device provided in this embodiment, in order to meet the temperature of the heat transfer surface of test pieces of different sizes, the protection layer 200 is composed of multiple protection boxes 210; similarly, the metering layer 300 is composed of multiple metering boxes 310, and the temperature control layer 500 is composed of multiple temperature control boxes 510.

[0036] Specifically, a plurality of protection boxes 210 are arranged in an array on the end face corresponding to the specimen holder frame 100, and the end face serves as a protection end face; there are at least two protection boxes 210 on each protection end face; taking four protection boxes 210 arranged on each protection end face as an example, the four protection boxes 210 are arranged in a 2×2 array, and adjacent protection boxes 210 are close together to make the heating more uniform.

[0037] A metering box heater 330 is provided inside the metering box 310 for releasing heat; the number of the metering boxes 310 is the same as the number of the protective boxes 210, and the metering boxes 310 and the protective boxes 210 are arranged one-to-one, and the metering boxes 310 are installed inside the protective box 210, so that the metering box 310 can provide a thermal environment for the specimen 800 in the specimen holder frame 100; at this time, the protective box 210 is mounted on the outside of the metering box 310, and the protective box 210 provides a constant thermal environment for the outside of the metering box 310, so as to avoid heat exchange between the external environment and the metering box 310, which leads to an increase in detection errors.

[0038] An array of multiple temperature control boxes 510 is arranged on the end face corresponding to the specimen holder frame 100, and the end face serves as the temperature control end face; the number of temperature control boxes 510 on each temperature control end face is at least two, and is preferably the same as the number of protection boxes 210 on a single protection end face. Therefore, the number of temperature control boxes 510 on the temperature control end face is described by taking four as an example, and the four temperature control boxes 510 are also arranged in a 2×2 array; a heating device and a cooling device are provided in the temperature control box 510, which can provide a hot environment or a cold environment as required.

[0039] Preferably, the size of the protection end face is the same as the size of the temperature control end face, that is, the size of the end face of the protection box 210 is the same as the size of the end face of the temperature control box 510.

[0040] Therefore, by controlling the protection boxes 210 at different positions on the same protection end surface, the size of the hot surface of the specimen can be adjusted; by controlling the opening of the protection boxes 210 on different protection end surfaces and controlling the heating of the temperature control boxes 510 on different temperature control end surfaces, the number and position of the hot surfaces of the specimen can be adjusted; similarly, by controlling the cooling of the temperature control boxes 510 on different temperature control end surfaces, the number and position of the cold surfaces of the specimen can be adjusted, and the cooling of the temperature control boxes 510 on a single temperature control end surface can be controlled to adjust the size of the cold surface of the specimen, thereby being able to adjust the heat transfer surface of the specimen according to demand.

[0041] Example 2 refer to Figure 4 Based on Example 1, the three-dimensional building space enclosure heat transfer performance detection device provided in this embodiment is preferably provided with a support pad 600 at the bottom of each of them, and a slide rail 610 is provided on the ground below the support pad 600. At this time, a pulley is provided at the bottom of the support pad 600 to be slidably connected with the slide rail 610, thereby reducing the difficulty of operation and improving the test efficiency.

[0042] To further explain, the protective end face and the temperature control end face of the specimen holder frame 100 are provided with lateral supports and vertical supports, the protective box 210 is sealedly connected to the protective end face of the specimen holder frame 100 through the corresponding lateral supports and vertical supports, and the temperature control box 510 is also reliably sealedly connected to the temperature control end face of the specimen holder frame 100 through the corresponding lateral supports and vertical supports; the cold box 400 is sealedly connected to the outer frame of the specimen holder frame 100.

[0043] Preferably, a sealing strip 620 is provided along the outer contour of the specimen holder frame 100, and a sealing strip 620 is provided on the outer side of the lateral support and the outer side of the vertical support. The specimen holder frame 100 is sealed to the protection box 210 and the temperature control box 510 respectively through the sealing strip 620; similarly, the cold box 400 is also sealed to the surrounding side of the corresponding end face of the specimen holder frame 100 through the sealing strip 620, and the protection box 210, the temperature control box 510 and the cold box 400 can all be connected to the sealing strip 620 by snap-fit ​​or magnetic attraction.

[0044] The temperature control box 510 is provided with a refrigeration unit, a heating compensation device and an axial flow fan to provide a cold environment or a hot environment according to demand, and then the temperature is evenly diffused by the axial flow fan.

[0045] Take the example that the cold box 400 and the protective layer 200 have the same size, and the specimen holder frame 100 is a cubic structure; for example, the length and width of the protective box 210 are both 50 cm, the length and width of the temperature control box 510 are both 50 cm, and the length and width of the cold box 400 are both 100 cm.

[0046] Further explanation: In order to enable the metering box 310 to provide a stable and reliable thermal environment for the corresponding end face of the specimen 800, a clamping buffer 311 is preferably arranged between the outer wall of the metering box 310 and the inner wall of the protective box 210. The clamping buffer 311 can be selected as a flexible rubber pad or a spring, preferably a spring; the number of the clamping buffers 311 can be selected to be multiple, and the multiple clamping buffers 311 are arranged in an array, so that when the metering box 310 contacts the end face of the specimen 800, the metering box 310 is squeezed and stably close to the protective box 210, and the clamping buffer 311 is compressed, so that the metering box 310 can be in close contact with the corresponding end face of the specimen 800.

[0047] At the same time, in order to ensure that the metering box 310 is stable and reliable during movement, it is preferred to set a guide block 312 on the outside of the metering box 310, and set a guide rail 313 on the inner wall of the protective box 210. The guide rail 313 is set along the moving direction of the metering box 310, so that the metering box 310 is slidably connected to the guide rail 313 through the guide block 312, thereby making the movement of the metering box 310 more stable.

[0048] In order to make the thermal environment of the metering box 310 more uniform, a guide plate 320 is preferably provided inside the metering box 310. The guide plate 320 is located on the outside of the metering box heater 330. The guide plate 320 faces the inside of the specimen holder frame 100. The guide plate 320 makes the heat diffusion more uniform, thereby providing a uniform and stable testing environment for the specimen.

[0049] A first temperature sensor and a second temperature sensor are arranged on the metering box 310. The number of the first temperature sensors and the number of the second temperature sensors are both multiple. The multiple first temperature sensors are arranged in an array on the outer wall of the guide plate 320 to monitor whether the heat dissipation of the metering box 310 is uniform, thereby ensuring that a uniform and stable thermal environment is provided for the test piece; the multiple second temperature sensors are arranged on the inner wall of the metering box 310 and the outer wall of the metering box 310, respectively. The second temperature sensor located on the outer wall of the metering box 310 is arranged on the peripheral side of the protection box 210, and the second temperature sensor located on the inner wall of the metering box 310 is close to the inner wall of the guide plate 320, which is used to Determine whether the internal and external temperatures of the metering box 310 are consistent. If the temperature outside the metering box 310 is higher than the set temperature and higher than the temperature inside the metering box 310, reduce the heating temperature of the protection box 210 to stabilize the internal and external temperatures of the metering box 310 at the set temperature; for example, the temperature adjustment range of the metering box 310 is 5°C~50°C, and the temperature fluctuation range is 0.01°C~0.1°C; the temperature adjustment range of the protection box 210 is 5°C~50°C, and the temperature fluctuation range is 0.01°C~0.1°C; the temperature adjustment range of the cold box 400 is -20°C~50°C, and the temperature fluctuation range is 0.01°C~0.1°C.

[0050] Example 3 refer to Figure 5 Based on Example 2, the three-dimensional building space enclosure heat transfer performance detection device provided in this embodiment also includes a thermal insulation baffle 700, which is detachably connected to the inside of the specimen support frame 100, and the number of the thermal insulation baffles 700 is determined according to usage requirements.

[0051] Specifically, when the specimen 800 is not in direct contact with the corresponding temperature control box 510 and / or protective box 210, in order to further improve the temperature accuracy of the heat transfer surface of the specimen, a temperature control channel can be built using a temperature insulation baffle 700. One end of the temperature control channel is connected to the end face of the specimen 800, and the other end of the temperature control channel is connected to the temperature control box 510 or the protective box 210, thereby improving the temperature control reliability of the corresponding end face of the specimen.

[0052] The thermal insulation baffle 700 can isolate the heat exchange on both sides. Therefore, different numbers of thermal insulation baffles 700 can be used to connect with the end surface of the cold box 400 according to needs, so as to control the size of the cold environment provided by the cold box 400 and further meet different detection requirements.

[0053] Working principle: To further illustrate, a specimen 800 of corresponding size is cast according to the target building space enclosure; that is, the internal space of the specimen 800 is the target building space enclosure, and the target building space enclosure inside the specimen 800 is not drawn in the figure; in order to facilitate the explanation of the difference in the layout size of the specimen 800, the specimen 800 is split into multiple identical experimental blocks for example.

[0054] refer to Figure 2 , the specimen 800 is obtained by stacking four experimental blocks, and the specimen 800 is located on the left side of the specimen support frame 100; if the three-dimensional building space enclosure actually has five hot surfaces and one cold surface, that is, five heating surfaces and one heat dissipation surface, all the protection boxes 210 and the metering boxes 310 on the left protection end surface can be opened, the two protection boxes 210 and the two metering boxes 310 on the rear protection end surface facing the specimen 800 can be opened, the cold box 400 can be opened, the two temperature control boxes 510 on the front temperature control end surface facing the specimen 800 can be opened, the two temperature control boxes 510 on the top temperature control end surface facing the specimen 800 can be opened, and the two protection boxes 210 and the two metering boxes 310 on the bottom protection end surface facing the specimen 800 can be opened.

[0055] The temperature provided by the temperature control box 510 is kept the same as the temperature provided by the metering box 310 , and the temperature of the right end surface of the test piece 800 is maintained by the cold box 400 .

[0056] refer to Figure 4 , the specimen 800 is obtained by stacking four experimental blocks; the specimen 800 is located at the left part of the specimen support frame 100; since the cold surface and the hot surface are determined by the relative temperature, for example, there are actually three cold surfaces and three hot surfaces in the three-dimensional building space enclosure, the positions of the cold surface and the hot surface of the specimen 800 are then determined, and the upper, left and right end surfaces of the specimen 800 are all cold surfaces. At this time, all the temperature control boxes 510 on the top temperature control end surface are opened, all the protection boxes 210 and the metering box 310 on the left protection end surface are opened, and the cold box 40 is opened. 0, at this time the temperature of the temperature control box 510, the temperature of the protection box 210, the temperature of the metering box 310 and the temperature of the cold box 400 are all 15°C; then start the two temperature control boxes 510 on the front temperature control end face facing the specimen 800, start the two protection boxes 210 and the two metering boxes 310 on the rear protection end face facing the specimen 800, and start the two protection boxes 210 and the two metering boxes 310 on the bottom protection end face facing the specimen 800. At this time, the temperatures of the temperature control box 510, the protection box 210 and the metering box 310 are all 30°C.

[0057] refer to Figure 5 , the specimen 800 is obtained from an experimental block; at the same time, two temperature control channels are built using four temperature insulation baffles 700, one temperature control channel connects the top end surface of the specimen 800 and the temperature control box 510 on the top temperature control end surface that is opposite to the specimen 800; the other temperature control channel connects the front side end surface of the specimen 800 and the temperature control box 510 on the front side temperature control end surface that is opposite to the specimen 800.

[0058] During the testing process, the two corresponding temperature control boxes 510 can be controlled according to requirements to provide accurate and stable ambient temperature for the corresponding end faces of the test piece 800.

[0059] refer to Figure 6 , the specimen 800 is spliced ​​by four experimental blocks, and the specimen 800 is located at the bottom of the specimen support frame 100; if the three-dimensional building space enclosure actually has five hot surfaces and one cold surface, since the cold surface provided by the cold box 400 is larger than the size of the corresponding end surface of the specimen 800, it will affect the thermal environment provided by the top of the specimen 800. At this time, two thermal insulation baffles 700 can be used to connect with the upper part of the right end surface of the specimen support frame 100 to prevent the cold box 400 from affecting the temperature above the specimen 800.

[0060] Example 4 Based on Example 3, this embodiment provides a method for detecting the heat transfer performance of a three-dimensional building space enclosure, comprising the following steps: S1. Determine the size of the specimen 800, the size of the internal space of the specimen 800, and the heat transfer surface of the specimen 800 according to the environment of the target building space enclosure; Specifically, for example, if the target building space enclosure is a rooftop house with floor heating, the specimen 800 can be cast according to the size of the target building space enclosure so that the interior of the specimen 800 simulates the interior space of the house. At the same time, it can be determined that the bottom of the specimen 800 is a hot environment and the other five end faces of the specimen 800 are a cold environment.

[0061] S2, casting the specimen 800 in the specimen support frame 100, and setting a specimen temperature sensor on the inner wall of the specimen 800; Specifically, refer to Figure 6 , the specimen 800 is cast and cured in the specimen support frame 100. In order to obtain the temperature of each end face inside the specimen 800 later, it is necessary to arrange a specimen temperature sensor on each end face of the internal space of the specimen 800 when casting the specimen 800. Multiple specimen temperature sensors are arranged on each end face. When calculating, the average value of the specimen temperature sensors on the corresponding end face is taken as the surface temperature of the corresponding end face of the specimen 800.

[0062] S3. Determine the placement position of the test piece 800 and the protection box 210, metering box 310 and temperature control box 510 that need to be opened according to the heat transfer surface of the test piece 800; Specifically, according to the environment in which the target building space enclosure is located, it is determined that all metering boxes 310 and all protection boxes 210 on the bottom protective end face need to be opened during the detection process, and the temperature is set to 23°C for example to provide a hot environment for the specimen 800; at the same time, the remaining cold boxes 400, temperature control boxes 510, metering boxes 310 and protection boxes 210 on the top need to be opened, and the temperature is set to 5°C for example to provide a cold environment for the remaining end faces of the specimen 800.

[0063] S4, sealingly connecting the protective layer 200, the cold box 400 and the temperature control layer 500 to the end surface of the specimen support frame 100; Specifically, the cold box 400 , the temperature control layer 500 and the two protective layers 200 connected to the support pad 600 are then moved along the slide rail 610 to be sealed and connected to the specimen support frame 100 , and the metering box 310 is located in the protective layer 200 .

[0064] S5. Start the cold box 400, the protection box 210, the metering box 310 and the temperature control box 510, and calculate the heat transfer performance of the internal space of the test piece 800.

[0065] To further illustrate, step S5 is specifically as follows: S5.1. Calculate the heat transfer coefficient of the heating surface of the specimen 800 according to the surface temperature of the heating surface of the specimen 800 and the heating temperature of the heating surface of the specimen 800. ;

[0066]

[0067] in, It is the sum of the power of the heated surface of the specimen 800 corresponding to the metering box 310, is the area of ​​the heated surface of the specimen 800, is the temperature of the thermal environment of the specimen 800 heated surface, is the surface temperature of the heated surface of the specimen 800; Specifically, during the test, the bottom of the test piece 800 is the heating surface, and the temperature provided by the metering box 310 corresponding to the bottom of the test piece 800 is the temperature of the thermal environment of the heating surface. , in degrees Celsius; the other end faces of the specimen 800 are heat dissipation surfaces, and the temperature of the corresponding protective layer 200, the temperature of the temperature control layer 500 and the temperature provided by the cold box 400 are all the temperatures of the cold environment of the heat dissipation surface , unit is ℃.

[0068] At this time, the temperature of the bottom end surface of the specimen 800 is first obtained by the specimen temperature sensor. , in degrees Celsius, the temperature of the thermal environment of the heating surface is determined by setting the temperature of the bottom metering box 310 , by obtaining the sum of the heating powers of all the thermal environment metering boxes 310 in the bottom protective layer 200, , in W, is the heat flux through the metering box 310. After the casting of the specimen 800 is completed, the area of ​​the bottom end surface of the specimen 800 can be obtained. , unit is m 2 .

[0069] S5.2, according to the heat transfer coefficient of the specimen 800 heating surface Calculate the heat transfer coefficient of the 800 heat dissipation surface of the specimen ;

[0070]

[0071] in, is the cold environment temperature of the heat dissipation surface of the specimen 800, is the surface temperature of the heat dissipation surface of specimen 800; Specifically, during the test, when the heat flow is stable, the heat received and the heat dissipated by the test piece 800 reach a balance, and the heat supply and the heat dissipation are equal and equal to Therefore, by obtaining the temperatures of the five heat dissipation surfaces of the specimen 800, which are t1, t2, t3, t4 and t5, the average temperature of all heat dissipation surfaces is calculated to be the surface temperature of the heat dissipation surface of the specimen 800. , unit is ℃.

[0072] S5.3, using the heat transfer coefficient of the heat dissipation surface of the specimen 800 and the heat transfer coefficient of the specimen 800 heating surface , the heat transfer coefficient of the internal space of the specimen 800 is obtained ;

[0073]

[0074]

[0075] in, is the heat flux density of the heated surface of the specimen 800; Specifically, through The thermal resistance of the specimen 800 can be calculated , is the heat flux density of the specimen 800 heated surface, in W / m 2 ; Then the heat transfer coefficient of the heat dissipation surface obtained by step S5.1 and step S5.2 and the heat transfer coefficient of the heated surface , calculate the thermal resistance of the 800 heated surface of the specimen And the thermal resistance of the heat dissipation surface of the specimen 800 , the thermal resistance of the internal space enclosure of the specimen 800 can be obtained , where thermal resistance Units, thermal resistance Units, thermal resistance Units and thermal resistance The unit is m 2 ℃ / W.

[0076] Complete the test of the heat transfer performance of the target building space enclosure. The test process simulates the actual environment and can obtain the temperature of each end surface of the target building space enclosure, making the test results more accurate and reliable.

[0077] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the present invention.

Claims

1. A device for detecting heat transfer performance of a three-dimensional building space enclosure, characterized in that: It comprises a protective layer (200), a metering layer (300), a cold box (400), a temperature control layer (500), and a specimen support frame (100) for accommodating a specimen (800); The specimen support frame (100) has four side end surfaces, and the four side end surfaces are sequentially provided with a protective layer (200), a protective layer (200), a temperature control layer (500) and a cold box (400); the top end surface of the specimen support frame (100) is provided with a temperature control layer (500); the bottom end surface of the specimen support frame (100) is provided with a protective layer (200); the metering layer (300) is provided inside the protective layer (200); and the protective layer (200), the metering layer (300), the cold box (400) and the temperature control layer (500) are all in communication with the inside of the specimen support frame (100).

2. The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 1, characterized in that: The protective layer (200) comprises a plurality of protective boxes (210) arranged in an array, and the metering layer (300) comprises a plurality of metering boxes (310); a protective box (210) is arranged outside each metering box (310), the metering boxes (310) are connected to the protective boxes (210), and the heat dissipation surface of the metering boxes (310) faces the interior of the specimen support frame (100).

3. The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 2, characterized in that: The back of the metering box (310) is provided with a clamping buffer (311), and the peripheral side of the metering box (310) is provided with a guide block (312); The metering box (310) is movably connected to the protection box (210) via a clamping buffer (311); a guide track (313) is provided on the inner wall of the protection box (210); the guide track (313) is provided along the thickness direction of the metering box (310); and the metering box (310) is slidably connected to the guide track (313) via a guide block (312).

4. The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 2, characterized in that: The metering box (310) is also provided with a guide plate (320), a first temperature sensor, and a second temperature sensor; The guide plate (320) is arranged on the heat dissipation surface of the metering box (310); the first temperature sensor is arranged on the outer wall of the guide plate (320), and the second temperature sensor is arranged on the inner wall of the metering box (310) and the outer wall of the metering box (310), respectively.

5. The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 4, characterized in that: The temperature control layer (500) comprises a plurality of temperature control boxes (510), and the plurality of temperature control boxes (510) are arranged in an array.

6. The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 5, characterized in that: The bottom of the cold box (400), the bottom of the temperature control layer (500) and the bottom of the two protective layers (200) on the side of the specimen support frame (100) are all provided with support pads (600), and the bottom of the support pads (600) is provided with slide rails (610). The slide rails (610) are slidably connected to the support pads (600), and the slide rails (610) are all located on the peripheral side of the specimen support frame (100).

7. The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 6, characterized in that: The protective layer (200), the cold box (400) and the temperature control layer (500) are all sealed and connected to the specimen support frame (100) via a sealing strip (620).

8. The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 6, characterized in that: The three-dimensional building space enclosure heat transfer performance detection device further comprises a thermal insulation baffle (700), the thermal insulation baffle (700) being arranged inside the specimen support frame (100), the thermal insulation baffle (700) being detachably connected to the specimen support frame (100), and the thermal insulation baffle (700) surrounding between the specimen (800) and the temperature control box (510) and / or the protection box (210) to form a temperature control channel.

9. A method for detecting heat transfer performance of a three-dimensional building space enclosure, characterized in that: The device for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 7 comprises the following steps: S1. Determine the size of the test piece (800), the internal space size of the test piece (800), and the heat transfer surface of the test piece (800) according to the environment in which the target building space enclosure is located; S2, casting the test piece (800) in the test piece support frame (100), and setting a test piece temperature sensor on the inner wall of the test piece (800); S3. Determine the protection box (210), the metering box (310), and the temperature control box (510) that need to be opened according to the heat transfer surface of the test piece (800); S4, sealingly connecting the protective layer (200), the cold box (400) and the temperature control layer (500) to the end surface of the specimen support frame (100); S5. Start the cold box (400), the protection box (210), the metering box (310), and the temperature control box (510), and calculate the heat transfer performance of the internal space of the test piece (800).

10. The method for detecting heat transfer performance of a three-dimensional building space enclosure according to claim 9, characterized in that: The step S5 comprises the following steps: S5.

1. Calculate the heat transfer coefficient of the heating surface of the specimen (800) based on the surface temperature of the heating surface of the specimen (800) and the heating temperature of the heating surface of the specimen (800). ; in, is the sum of the powers of the metering box (310) corresponding to the heated surface of the specimen (800), is the area of ​​the heated surface of the specimen (800), is the temperature of the thermal environment of the heated surface of the specimen (800), is the surface temperature of the heated surface of the specimen (800); S5.2, according to the heat transfer coefficient of the heated surface of the specimen (800) Calculate the heat transfer coefficient of the heat dissipation surface of the specimen (800) ; in, is the cold environment temperature of the heat dissipation surface of the specimen (800), is the surface temperature of the heat dissipation surface of the specimen (800); S5.

3. Heat transfer coefficient of the heat dissipation surface of the specimen (800) and the heat transfer coefficient of the heated surface of the specimen (800) , the heat transfer coefficient of the internal space of the specimen (800) is obtained ; in, is the heat flux density of the heated surface of the specimen (800).

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