Building envelope heat transfer coefficient testing device capable of simulating solar radiation

Abstract

The utility model discloses a building envelope heat transfer coefficient testing device capable of simulating solar radiation, which comprises a hot box, a cold box, a heater, a heat flow sensor, an irradiation light source, a temperature sensor and a refrigerating machine. The surfaces, in contact with the building envelope structure, of the hot box and the cold box are openings, temperature sensors are arranged in the hot box and the cold box respectively, the heater is used for heating the interior of the hot box, the heat flow sensor is located in the cold box and attached to the building envelope structure, and the irradiation light source is arranged on the inner wall, away from the opening of the cold box, of the cold box and used for simulating solar radiation. The refrigerating machine is used for cooling the interior of the cold box. According to the utility model, external solar radiation is simulated through the irradiation light source, so that the heat transfer coefficient of the building envelope structure can be more accurately tested.

Description

Technical Field

[0001] The utility model relates to the field of testing and verification of building energy-saving engineering, and specifically relates to a test device for the heat transfer coefficient of a building envelope structure that can simulate solar radiation. Background Art

[0002] As the main factor affecting building energy consumption, the heat load of the envelope structure has great energy-saving potential. Optimizing its test method and accurately evaluating its thermal performance are particularly important. The existing on-site test methods for the heat transfer coefficient of building envelope structures are mainly the hot box method and the heat flow meter method:

[0003] The principle of the hot box method is to create an artificial one-dimensional heat transfer environment. The inner side of the measured part is simulated with a hot box to keep the air temperature in the hot box and the indoor air temperature consistent, and the other side is the outdoor natural condition, maintaining a certain temperature difference between the hot box and the outdoor. In this way, the heat flow of the measured part always transfers from the indoor to the outdoor. When the heating amount in the hot box reaches equilibrium with the heat transfer amount through the measured part, the heat transfer amount of the measured part is obtained by measuring the heating amount of the hot box.

[0004] The heat flow meter method uses a heat flow meter and temperature sensors to measure the heat flow value and surface temperature passing through the component, and calculates the thermal resistance and heat transfer coefficient of the component through calculation. Its principle is to artificially create a temperature difference between indoor and outdoor, arrange heat flow meters and thermocouples on the inner and outer surfaces of the test part, collect the signals of the heat flow meters and thermocouples through corresponding data acquisition equipment, convert them into heat flow values and temperatures through computer processing, and then calculate the heat transfer coefficient of the test part. For specific references, please refer to the following technical literature:

[0005] Li Honghui, Huang Yuanyang, Zhuang Zihao. Discussion on on-site test methods for the thermal performance of building envelopes and their influencing factors [J]. Building Energy Efficiency, 2009, 37(11): 5-8.

[0006] However, neither of the above two test methods can simulate the influence of solar radiation on the on-site test results of the thermal performance of building materials. The heating effect of solar radiation, the variable radiation angle, and the lighting duration will change the heat flow direction, affect the heat gain of building materials, and thus affect the overall thermal performance of the building.

[0007] Therefore, in order to more accurately test the heat transfer coefficient of the building envelope structure, a test device for the heat transfer coefficient of a building envelope structure that can simulate solar radiation is designed in the utility model. Summary of the Utility Model

[0008] The purpose of the utility model is to provide a test device for the heat transfer coefficient of a building envelope structure that can simulate solar radiation, which can more accurately test the heat transfer coefficient of the building envelope structure.

[0009] The object of the present utility model is achieved by the following technical solutions:

[0010] A test device for the heat transfer coefficient of a building envelope that can simulate solar radiation, characterized in that: it includes a hot box, a cold box, a heater, a heat flux sensor, an irradiation light source, a temperature sensor and a refrigerator. During the test, the hot box and the cold box are respectively arranged on the inner and outer sides of the building envelope to be tested. The surfaces of the hot box and the cold box in contact with the building envelope are both open. Temperature sensors are respectively arranged in the hot box and the cold box. The heater is used to heat the inside of the hot box. The heat flux sensor is located in the cold box and is attached to the building envelope. The irradiation light source is arranged on the inner wall of the cold box far from its opening to simulate solar radiation, and the refrigerator is used to cool the inside of the cold box.

[0011] Further, the irradiation light source includes a fiber optic xenon lamp, and the fiber optic xenon lamps are uniformly arranged on the inner wall of the cold box far from its opening.

[0012] Further, heat sinks are respectively arranged on the inner walls of the hot box and the cold box far from their openings.

[0013] Further, axial flow fans are respectively arranged at the lower ends of the hot box and the cold box.

[0014] Further, the heater includes heating resistance wires, and the heating resistance wires are arranged on the inner wall of the hot box far from its opening.

[0015] Further, the refrigerator is provided with a circulating water pipe, and a part of the circulating water pipe is located in the cold box, and the inside of the cold box is cooled by circulating cooling water through the circulating water pipe.

[0016] Further, the temperature sensor includes a platinum resistance, and the platinum resistance is inserted into the hot box and the cold box.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] The present utility model measures the heat transfer coefficient by forming a temperature difference between the hot box and the cold box on the inner and outer sides of the building envelope, and an irradiation light source is arranged on the inner wall of the cold box to simulate the external solar radiation, taking into account the influence of solar radiation on the building envelope, so as to more accurately test the heat transfer coefficient of the building envelope, which helps to better simulate the actual environmental conditions and is convenient for evaluating the performance of materials in the actual use environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the test device for the heat transfer coefficient of the building envelope of the present utility model;

[0020] Figure 2 is a schematic structural diagram of the cold box of the present utility model;

[0021] Figure 3 It is a schematic structural diagram of the hot box of the present utility model.

[0022] Meanings of the reference numerals in the figure:

[0023] 1 - Hot box; 2 - Cold box; 3 - Fiber optic xenon lamp; 4 - Platinum resistance; 5 - Heat flux sensor; 6 - Heat sink; 7 - Heating resistance wire; 8 - Axial flow fan; 9 - Refrigerator; 10 - Circulating water pipe; 11 - Bracket; 12 - Building envelope structure; 13 - Thermal conductivity test host; 14 - Optical parameter simulation controller. Specific embodiments

[0024] The present utility model will be further described below in conjunction with embodiments.

[0025] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, understand greater than, less than, exceeding, etc. as not including the present number, and understand above, below, within, etc. as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0027] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0028] Embodiment:

[0029] As Figures 1 to 3 shown is a building envelope structure heat transfer coefficient test device capable of simulating solar radiation in this embodiment, which includes a hot box 1, a cold box 2, a heater, a heat flux sensor 5, an irradiation light source, a temperature sensor, and a refrigerator 9.

[0030] The hot box 1 is a square box with one side open. During testing, the side of the hot box 1 with the opening is abutted against the inner side of the building envelope 12 to be measured, and the temperature environment on the indoor side of the building envelope 12 is simulated through the hot box 1. The heater includes a heating resistance wire 7, and the heating resistance wire 7 is arranged on the inner wall of the hot box 1 away from its opening. During testing, the inside of the hot box 1 is heated through the heating resistance wire 7.

[0031] The cold box 2 is also a square box with one side open. During testing, the side of the cold box 2 with the opening is abutted against the outer side of the building envelope 12 to be measured. The position of the cold box 2 is basically aligned with that of the hot box 1, and the temperature environment on the outdoor side of the building envelope 12 is simulated through the cold box 2. The heat flux sensor 5 in this embodiment is a conventional patch type heat flux sensor. The heat flux sensor 5 is located inside the cold box 2 and attached to the building envelope 12.

[0032] The irradiation light source in this embodiment includes an optical fiber xenon lamp 3. The optical fiber xenon lamp 3 is uniformly arranged on the inner wall of the cold box 2 away from its opening. The light emitted by the optical fiber xenon lamp 3 will irradiate onto the building envelope 12 to be measured, which is used to simulate the external solar radiation, so as to more accurately measure the heat transfer coefficient of the building envelope 12.

[0033] Among them, the temperature sensor includes a platinum resistance 4. The platinum resistance 4 is inserted into the hot box 1 and the cold box 2, so as to detect the temperatures inside the hot box 1 and the cold box 2.

[0034] Radiating fins 6 are respectively arranged on the inner walls of the hot box 1 and the cold box 2 away from their openings. The radiating fins 6 can improve the efficiency of heat transfer to the surrounding environment, make the heat flux distribution inside the hot box 1 and the cold box 2 more uniform, and reduce local hot spots.

[0035] Axial flow fans 8 are respectively arranged at the lower ends of the hot box 1 and the cold box 2. By adjusting the axial flow fans 8, the air circulation inside and outside the hot box 1 and the cold box 2 can be adjusted, so as to better control the internal temperatures of the hot box 1 and the cold box 2.

[0036] The refrigerating machine 9 adopts a conventional circulating water refrigeration device, which is provided with a circulating water pipe 10. A part of the circulating water pipe 10 is located inside the cold box 2. The inside of the cold box 2 is cooled by circulating cooling water in the circulating water pipe 10, and the control accuracy of the temperature inside the cold box 2 can reach 0.1 °C.

[0037] During the test of the test device in this embodiment, the hot box 1 and the cold box 2 will be installed on the inner and outer sides of the building envelope 12 to be tested through a conventional bracket 11. The heat flux sensor 5 will be electrically connected to the external thermal conductivity test host 13, and the fiber optic xenon lamp 3 will be electrically connected to the external light parameter simulation controller 14. The refrigerator 9 is filled with water. When conducting the test, the inside of the hot box 1 is heated by the heating resistance wire 7, the inside of the cold box 2 is cooled by the refrigerator 9, and the fiber optic xenon lamp 3 is turned on to simulate solar radiation.

[0038] The above embodiments of the present utility model do not limit the protection scope of the present utility model. The implementation manners of the present utility model are not limited thereto. All kinds of modifications, substitutions or changes made to the above structure of the present utility model according to the above content of the present utility model, in accordance with the common general knowledge and customary means in the art, without departing from the above basic technical idea of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A test device for the heat transfer coefficient of building envelopes that can simulate solar radiation, characterized in that: It includes a hot box, a cold box, a heater, a heat flux sensor, an irradiation light source, a temperature sensor and a refrigerator. During the test, the hot box and the cold box are respectively arranged on the inner and outer sides of the building envelope to be tested. The surfaces of the hot box and the cold box in contact with the building envelope are both open. The temperature sensors are respectively arranged in the hot box and the cold box. The heater is used to heat the interior of the hot box. The heat flux sensor is located in the cold box and attached to the building envelope. The irradiation light source is arranged on the inner wall of the cold box far from its opening for simulating solar radiation. The refrigerator is used to cool the interior of the cold box.

2. The test device for the heat transfer coefficient of a building envelope that can simulate solar radiation according to claim 1, characterized in that: The irradiation light source includes a fiber optic xenon lamp, and the fiber optic xenon lamp is uniformly arranged on the inner wall of the cold box far from its opening.

3. The heat transfer coefficient test device for building envelopes capable of simulating solar radiation according to claim 1, characterized in that: Radiating fins are respectively arranged on the inner walls of the hot box and the cold box far from their openings.

4. The test device for the heat transfer coefficient of a building envelope that can simulate solar radiation according to claim 1, wherein: Axial flow fans are respectively arranged at the lower ends of the hot box and the cold box.

5. The heat transfer coefficient test device for building envelopes capable of simulating solar radiation according to claim 1, characterized in that: The heater includes heating resistance wires, and the heating resistance wires are arranged on the inner wall of the hot box far from its opening.

6. The test device for the heat transfer coefficient of a building envelope capable of simulating solar radiation according to claim 1, characterized in that: The refrigerator is provided with a circulating water pipe, and a part of the circulating water pipe is located in the cold box, and the interior of the cold box is cooled by circulating cooling water in the circulating water pipe.

7. The test device for the heat transfer coefficient of a building envelope that can simulate solar radiation according to claim 1, wherein: The temperature sensor includes a platinum resistance, and the platinum resistance is inserted into the hot box and the cold box.

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