Air bearing type membrane enclosure heat transfer coefficient calculation method

Abstract

This invention relates to the field of building load calculation and building envelope optimization technology, specifically disclosing a method for calculating the heat transfer coefficient of an air-supported membrane building envelope. The method includes the following steps: First, a dimensionless characteristic parameter is introduced to quantitatively characterize the shape of the irregular air gap inside the air-supported membrane building envelope; then, a characteristic equation applicable to natural convection heat transfer in the air gap of the air-supported membrane building envelope is introduced; next, the heat transfer coefficient of the building envelope under different working conditions is numerically simulated and the characteristic equation is solved by fitting; finally, the heat transfer coefficient of the air-supported membrane building envelope under different design parameters and different temperature differences is calculated based on the obtained characteristic equation. This invention, employing the above-mentioned method for calculating the heat transfer coefficient of an air-supported membrane building envelope, solves the problem of accurately quantifying the heat transfer coefficient of an air-supported membrane building envelope under dynamic changes, improves the accuracy of load calculation for air-supported membrane building envelopes, and reduces the design cost of air-supported membrane buildings.

Description

Technical Field

[0001] This invention relates to the field of building load calculation and building envelope optimization technology, and in particular to a method for calculating the heat transfer coefficient of an air-supported membrane building envelope. Background Technology

[0002] Air-supported membrane envelopes have become the most numerous and widely used form of inflatable membrane architecture due to their superior structural performance, economy, environmental friendliness, light weight, large span, rapid construction, recyclability, and strong artistic appeal. The envelope consists of an inner membrane, an insulation layer, irregular air gaps, and an outer membrane. Compared with traditional envelopes and other fluid-structure interaction envelopes, the heat transfer process of air-supported membrane envelopes differs significantly, making it difficult to quantify their heat transfer coefficient.

[0003] On the one hand, air-supported membrane enclosures are composed of multiple membrane structure units, each containing a circulating air gap. Compared to other fluid-structure interaction enclosures, air-supported membrane enclosures can reach a vertical height of up to 60m and exhibit significant inclination angles and curvatures, resulting in an irregular shape in the horizontal direction. The temperature and velocity fields of this large, irregular air gap are unevenly distributed, and the flow state fluctuates greatly. The natural convective heat transfer process cannot be simply simplified as one- or two-dimensional; it exhibits multi-dimensional nonlinear heat transfer characteristics with coupled effects of heat conduction, convection, and radiation. This also leads to the heat transfer coefficient of air-supported membrane enclosures varying with different design parameters, making accurate quantification difficult.

[0004] On the other hand, the membrane material of an air-supported membrane enclosure is extremely thin and lightweight, with negligible thermal resistance. In contrast, the internal natural convection heat transfer coefficient and the heat transfer coefficient of the insulation layer have a significant impact on thermal performance. However, the internal natural convection flow characteristics and heat transfer features of an air-supported membrane enclosure vary considerably under different meteorological parameters with different temperature differences. This results in significant differences in the heat transfer coefficient of the enclosure structure under the same design parameters at different times and in different spaces.

[0005] In summary, the heat transfer coefficient of air-supported membrane envelopes varies with design parameters and outdoor weather conditions, making it difficult to establish a theoretical basis for thermal parameters related to the heat transfer coefficient in the calculation of building loads.

[0006] Therefore, there is an urgent need to invent a method for calculating the heat transfer coefficient of air-supported membrane envelope structures, improve the accuracy of air conditioning load calculation for air-supported membrane envelope structures, and provide a theoretical basis for the selection of air conditioning systems for air-supported membrane envelope structures. Summary of the Invention

[0007] The purpose of this invention is to provide a method for calculating the heat transfer coefficient of an air-supported membrane envelope, which solves the problem of accurately quantifying the heat transfer coefficient of an air-supported membrane envelope under dynamic changes, improves the accuracy of load calculation for air-supported membrane envelopes, and reduces the design cost of air-supported membrane buildings.

[0008] To achieve the above objectives, the present invention provides a method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure, comprising the following steps: S1. Determine the design parameters of the air-supported membrane enclosure structure. The design parameters include dimensionless characteristic parameters that quantitatively characterize the shape of the irregular air gaps inside the air-supported membrane enclosure structure. S2. Establish the characteristic equation of natural convection heat transfer in the air space of the air-supported membrane enclosure structure; S3. The heat transfer coefficient of the air-supported membrane enclosure structure is calculated using the Ansys-Fluent numerical simulation method. The undetermined coefficients in the characteristic equation of S2 are obtained by fitting the value of the heat transfer coefficient. S4. Substitute the undetermined coefficients obtained from fitting S3 into the characteristic equation of S2 to obtain a definite characteristic equation expression. S5. For the target air-supported membrane enclosure structure, substitute the actual design parameters of the enclosure structure, the hourly temperature difference of the target area, and the temperature difference of the indoor design temperature into the characteristic equation determined in S4 to calculate the hourly heat transfer coefficient of the air layer. S6. Substitute the hourly heat transfer coefficient of the air gap into the formula for the total heat transfer coefficient of the building envelope to calculate the total heat transfer coefficient of the air-supported membrane building envelope.

[0009] Preferably, in S1, dimensionless characteristic parameters are defined. Shape coefficients, characteristic parameters The expression is: ; in, Let be the side length of the air gap layer near the outer membrane. It is the side length of the air gap layer near the insulation layer and the inner membrane.

[0010] Preferably, in S2, a natural convection heat transfer characteristic equation is established, and the convective heat transfer coefficient of the air gap in the air-supported membrane enclosure structure is calculated using this equation. The natural convection heat transfer characteristic equation is expressed as follows: ; or ; ; ; in, The heat transfer coefficient of the air gap; The characteristic length; The average thickness of the air gap; The thermal conductivity of the fluid; Indicates temperature difference; Indicates the dynamic viscosity of a fluid; It is the acceleration due to gravity; The coefficient of volume expansion; The thermal diffusivity of the fluid; The equivalent height of the enclosure structure; The average inclination angle of the enclosure structure.

[0011] Preferably, in S3, the Ansys-Fluent numerical simulation method is used to calculate different temperature differences. Different characteristic parameters Heat transfer coefficient of air gap in air-supported membrane enclosure under combined operating conditions Regarding the heat transfer coefficient The values ​​are fitted to obtain the undetermined coefficients in the characteristic equation of S2. , and .

[0012] Preferably, S3 includes the following steps: S31. Establish a numerical model of the air-supported membrane envelope structure in Fluent based on architectural design drawings; S32. Based on the numerical model in S31, set appropriate physical property parameters for the unsteady physical property building envelope. The building envelope of the air-supported membrane structure includes an outer membrane, an air gap, an insulation layer, and an inner membrane. The physical property parameters of the outer membrane, air gap, insulation layer, and inner membrane include thermal conductivity, specific heat capacity, and density. S33. The numerical model is solved using Fluent’s built-in Couple algorithm, and the radiation model is set as a Discrete Ordinates radiation model. S34. The indoor design temperature is set to a fixed value in the boundary conditions. Outdoor air temperature at ~ Multiple gradient values ​​are selected within the range for simulation; S35. Fit the convective heat transfer coefficient in the simulation results to the indoor-outdoor temperature difference, and solve for the coefficients of the characteristic equation. ; S36. The coefficients calculated in S35 Substituting into the characteristic equation, the indoor design temperature is set as follows in the boundary conditions: Outdoor air temperature set to The outer membrane side length of the enclosure structure Set as Inner membrane side length Set to respectively , , , , , Perform a simulation; S37. Fit the convective heat transfer coefficient and the average thickness of the air gap in the simulation results to calculate the coefficient. ; S38. The coefficients calculated in S37 Substituting into the characteristic equation, the indoor design temperature is set as follows in the boundary conditions: Outdoor air temperature set to The outer membrane side length of the enclosure structure Set as Inner membrane side length Set to respectively , , , , , Simulation was conducted by changing the tilt angle of the enclosure structure. S39. Fit the convective heat transfer coefficient and tilt angle in the simulation results to obtain... ; S310, will Substitute the values ​​into the characteristic equation and calculate the coefficients of the characteristic equation based on any of the previously simulated operating conditions. .

[0013] Preferably, in S32, the thermal conductivity of the outer membrane, air, insulation layer, and inner membrane are 0.22 W / (m·K), 0.0267 W / (m·K), 0.028 W / (m·K), and 0.214 W / (m·K), respectively; the specific heat capacities are 1360 J / (kg·℃), 1003 J / (kg·℃), 670 J / (kg·℃), and 1360 J / (kg·℃), respectively; and the densities are 1250 kg / m³, respectively. 3 1.205kg / m 3 48kg / m 3 and 1208kg / m 3 .

[0014] Preferably, in S34, The value is 26℃. The value is 30℃. The value is 60℃.

[0015] Preferably, in S38, the inclination angle of the enclosure structure increases sequentially from 0°, 10°, ... to 70°.

[0016] Preferably, in S6, the formula for calculating the overall heat transfer coefficient of the air-supported membrane envelope is: ; in, For the thermal resistance of the outer membrane, For the thermal resistance of the insulation layer, Thermal resistance of the inner membrane.

[0017] Therefore, the present invention employs the above-mentioned method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure, and the beneficial effects are as follows: (1) The method of the present invention can quantitatively characterize the irregular shape of the air gap inside the air-supported membrane enclosure structure through characteristic parameters.

[0018] (2) The method of the present invention can accurately calculate the total heat transfer coefficient and the convective heat transfer coefficient of the internal air layer of the enclosure structure under any temperature difference, any air layer thickness and any tilt angle.

[0019] (3) The method of the present invention can improve the accuracy of load calculation of air-supported membrane structure and reduce unnecessary energy consumption of air-supported membrane structure.

[0020] (4) The method of the present invention can guide the selection of air conditioning system for air-supported membrane buildings, improve the compatibility of air conditioning system with air-supported membrane buildings, and reduce unnecessary design costs.

[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is an overall flowchart of an embodiment of the method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to the present invention; Figure 2 This is a schematic diagram of an air-supported membrane enclosure structure according to an embodiment of the method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure of the present invention. (a) is a schematic diagram of the air-supported membrane enclosure structure from various perspectives, (b) is a schematic diagram of the enclosure structure unit, and (c) is a schematic diagram of the enclosure structure parameters. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0025] To accurately quantify the heat transfer coefficient of air-supported membrane structures, this invention introduces dimensionless characteristic parameters that can quantify the irregular shape of the air gap. value, The value can be obtained by measuring the inner and outer side lengths of the cross-section of the air gap in the building envelope. , The irregular heat transfer surface shape is transformed into an equivalent regular heat transfer surface shape, thereby simplifying the solution of the air gap convective heat transfer problem. A characteristic equation applicable to the natural convective heat transfer of the irregular air gap inside the air-supported membrane enclosure structure is introduced. This characteristic equation can calculate the total heat transfer coefficient of the enclosure structure and the convective heat transfer coefficient of the internal air gap under any temperature difference, any air gap thickness and any tilt angle.

[0026] Example 1: like Figure 1 As shown, a method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure includes the following steps: S1. Determine the design parameters of the air-supported membrane enclosure structure, such as... Figure 2 As shown, the enclosure structure of an air-supported membrane structure includes an outer membrane, an air gap, an insulation layer, and an inner membrane. In this embodiment, the side length of the air gap closest to the outer membrane is 1.4m, and the side length of the air gap closest to the inner membrane and the insulation layer is 1.45m.

[0027] The design parameters include dimensionless characteristic parameters that quantitatively characterize the irregular air gap shape inside the air-supported membrane enclosure structure. Define dimensionless characteristic parameters. This is the shape coefficient, this characteristic parameter. The expression is: ; in, The length of the air gap layer near the outer membrane, in meters. The length of the air gap layer near the insulation layer and the inner membrane, in meters.

[0028] This invention introduces characteristic parameters The inner and outer side lengths of the air gap cross-section of the enclosure structure can be used as a reference. , By transforming irregular heat transfer surface shapes into equivalent regular heat transfer surface shapes, the calculation of air-to-air convective heat transfer problems is simplified.

[0029] S2. Establish the natural convection heat transfer characteristic equation for the air space of the air-supported membrane envelope structure, and calculate the convective heat transfer coefficient of the air space of the air-supported membrane envelope structure using the natural convection heat transfer characteristic equation. The expression of the natural convection heat transfer characteristic equation is as follows: ; or ; ; ; in, The heat transfer coefficient of the air gap is expressed in W / (m²). 2 ·K); The characteristic length is expressed in meters (m). This represents the average thickness of the air gap, in meters (m). is the thermal conductivity of the fluid, expressed in W / (m·K); This represents the temperature difference, expressed in Kelvin (K). The dynamic viscosity of a fluid is expressed in Pa·s. Acceleration due to gravity, unit m / s² 2 ; The volumetric expansion coefficient is expressed in K. -1 ; The thermal diffusivity of the fluid is expressed in m. 2 / s; The equivalent height of the enclosure structure, in meters (m). The average inclination angle of the enclosure structure is expressed in degrees (°).

[0030] The natural convection heat transfer characteristic equation proposed in this invention, applicable to air-supported membrane enclosure structures, considers the influence of heat transfer surface shape and tilt angle on the heat transfer coefficient in addition to temperature difference and air gap thickness, compared to traditional characteristic equations.

[0031] S3. Using the Ansys-Fluent numerical simulation method, calculate the results for different temperature differences. Different characteristic parameters Heat transfer coefficient of air gap in air-supported membrane enclosure under combined operating conditions Regarding the heat transfer coefficient The values ​​are fitted to obtain the undetermined coefficients in the characteristic equation of S2. , and This includes the following steps: S31. Based on the CAD architectural design drawings provided by the membrane structure manufacturer, establish a numerical model of the air-supported membrane envelope in Fluent.

[0032] S32. Based on the numerical model in S31, set appropriate physical property parameters for the unsteady enclosure structure. The physical property parameters for the outer membrane, air, insulation layer, and inner membrane include thermal conductivity, specific heat capacity, and density. The thermal conductivity of the outer membrane, air, insulation layer, and inner membrane are 0.22 W / (m·K), 0.0267 W / (m·K), 0.028 W / (m·K), and 0.214 W / (m·K), respectively; the specific heat capacities are 1360 J / (kg·℃), 1003 J / (kg·℃), 670 J / (kg·℃), and 1360 J / (kg·℃), respectively; and the densities are 1250 kg / m³, respectively. 3 1.205kg / m3 48kg / m 3 and 1208kg / m 3 .

[0033] S33. The numerical model is solved using Fluent’s built-in Couple algorithm, and the radiation model is set as a Discrete Ordinates radiation model.

[0034] S34. The indoor design temperature is set to a fixed value in the boundary conditions. In this embodiment The value is 26℃. The outdoor air temperature is... ~ Multiple gradient values ​​are selected within the range for simulation; The value is 30℃. The value is 60℃. In this embodiment, the outdoor air temperature is simulated at 30, 35, 40, 45, 50, 55, and 60℃ respectively.

[0035] S35. Fit the convective heat transfer coefficient in the simulation results to the indoor-outdoor temperature difference, and solve for the coefficients of the characteristic equation. The formula obtained by fitting in this embodiment is as follows: ; Then let =0.1078.

[0036] S36. The coefficients calculated in S35 Substituting into the characteristic equation, the formula is as follows: ; The indoor design temperature is set as a boundary condition. =26℃, outdoor air temperature set to =40℃, the outer membrane side length of the enclosure structure Set as =1.4m, inner membrane side length Set to respectively =1.45m =1.5m =1.55m =1.60m =1.65m =1.70m for simulation.

[0037] S37. Fit the convective heat transfer coefficient and the average thickness of the air gap in the simulation results to calculate the coefficient. The formula obtained by fitting in this embodiment is: ; Let 3a-b-1=-0.375, then calculate the coefficient. =-0.3016.

[0038] S38, calculate in S37 The obtained coefficients Substituting into the characteristic equation, the formula is as follows: ; The indoor design temperature is set as a boundary condition. =26℃, outdoor air temperature set to =40℃, the outer membrane side length of the enclosure structure Set as Inner membrane side length Set to respectively , , , , , Simulations were conducted by changing the inclination angle of the enclosure structure from 0°, 10°, ... to 70°.

[0039] S39. Fit the convective heat transfer coefficient and tilt angle in the simulation results to obtain... In this embodiment, the calculation is performed. The formula is as follows: .

[0040] S310, will Substituting into the characteristic equation, the formula is as follows: ; Calculate the coefficients of the characteristic equation based on any of the aforementioned simulated operating conditions. In this example, the indoor design temperature is 26℃, the outdoor air temperature is 40℃, and the outer membrane side length of the building envelope is... It is 1.4m long, and the inner membrane side length is... The calculation was performed under the condition that the height is 1.45m and the inclination angle of the enclosure structure is 70°, and the coefficient was obtained. It is 2.114.

[0041] S4. The undetermined coefficients obtained by fitting S3 , and Substituting into the characteristic equation of S2, we obtain the following definite expression for the characteristic equation: .

[0042] S5. For the actual target air-supported membrane enclosure structure, substitute the actual design parameters of the enclosure structure, the hourly temperature difference of the target area, and the temperature difference of the indoor design temperature into the characteristic equation determined in S4 to calculate the hourly heat transfer coefficient of the air layer. .

[0043] S6, Calculate the hourly heat transfer coefficient of the air gap. Substituting the values ​​into the formula for the overall heat transfer coefficient of the building envelope, the overall heat transfer coefficient of the air-supported membrane building envelope is calculated. The calculation formula is: ; in, For the thermal resistance of the outer membrane, For the thermal resistance of the insulation layer, Thermal resistance of the inner membrane, in units of (m) 2 ·K) / W.

[0044] In summary, this invention introduces dimensionless characteristic parameters. The shape of the irregular air gap inside the building envelope is quantitatively characterized. Then, the natural convection heat transfer characteristic equation applicable to the air gap of the air-supported membrane building envelope is given. The convective heat transfer coefficient under different working conditions is simulated using Ansys-Fluent, and the natural convection heat transfer characteristic equation is solved. Finally, the obtained characteristic equation can be used to accurately calculate the total heat transfer coefficient of the building envelope and the convective heat transfer coefficient of the internal air gap under any temperature difference, any air gap shape and any tilt angle.

[0045] Therefore, this invention employs the aforementioned method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure, solving the problem of quantifying the irregular shape of the air gap inside the air-supported membrane enclosure structure by introducing dimensionless characteristic parameters. This method transforms irregular shapes into regular shapes for calculation, reducing the difficulty of solving the characteristic equation while ensuring calculation accuracy.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure, characterized in that, Includes the following steps: S1. Determine the design parameters of the air-supported membrane enclosure structure. The design parameters include dimensionless characteristic parameters that quantitatively characterize the shape of the irregular air gaps inside the air-supported membrane enclosure structure. S2. Establish the characteristic equation of natural convection heat transfer in the air space of the air-supported membrane enclosure structure; S3. The heat transfer coefficient of the air-supported membrane enclosure structure is calculated using the Ansys-Fluent numerical simulation method. The undetermined coefficients in the characteristic equation of S2 are obtained by fitting the value of the heat transfer coefficient. S4. Substitute the undetermined coefficients obtained from fitting S3 into the characteristic equation of S2 to obtain a definite characteristic equation expression. S5. For the target air-supported membrane enclosure structure, substitute the actual design parameters of the enclosure structure, the hourly temperature difference of the target area, and the temperature difference of the indoor design temperature into the characteristic equation determined in S4 to calculate the hourly heat transfer coefficient of the air layer. S6. Substitute the hourly heat transfer coefficient of the air gap into the formula for the total heat transfer coefficient of the building envelope to calculate the total heat transfer coefficient of the air-supported membrane building envelope.

2. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 1, characterized in that, In S1, dimensionless characteristic parameters are defined. Shape coefficients, characteristic parameters The expression is: ； in, Let be the side length of the air gap layer near the outer membrane. It is the side length of the air gap layer near the insulation layer and the inner membrane.

3. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 2, characterized in that, In S2, a natural convection heat transfer characteristic equation is established. This equation is then used to calculate the convective heat transfer coefficient of the air gap in the air-supported membrane envelope. The expression of the natural convection heat transfer characteristic equation is as follows: ； or ; ； ； in, The heat transfer coefficient of the air gap; The characteristic length; The average thickness of the air gap; The thermal conductivity of the fluid; Indicates temperature difference; Indicates the dynamic viscosity of a fluid; It is the acceleration due to gravity; The coefficient of volume expansion; The thermal diffusivity of the fluid; The equivalent height of the enclosure structure; The average inclination angle of the enclosure structure.

4. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 3, characterized in that, In S3, the Ansys-Fluent numerical simulation method is used to calculate different temperature differences. Different characteristic parameters Heat transfer coefficient of air gap in air-supported membrane enclosure under combined operating conditions Regarding the heat transfer coefficient The values ​​are fitted to obtain the undetermined coefficients in the characteristic equation of S2. , and .

5. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 4, characterized in that, S3 includes the following steps: S31. Establish a numerical model of the air-supported membrane envelope structure in Fluent based on architectural design drawings; S32. Based on the numerical model in S31, set appropriate physical property parameters for the unsteady physical property building envelope. The building envelope of the air-supported membrane structure includes an outer membrane, an air gap, an insulation layer, and an inner membrane. The physical property parameters of the outer membrane, air gap, insulation layer, and inner membrane include thermal conductivity, specific heat capacity, and density. S33. The numerical model is solved using Fluent’s built-in Couple algorithm, and the radiation model is set as a Discrete Ordinates radiation model. S34. The indoor design temperature is set to a fixed value in the boundary conditions. Outdoor air temperature at ~ Multiple gradient values ​​are selected within the range for simulation; S35. Fit the convective heat transfer coefficient in the simulation results to the indoor-outdoor temperature difference, and solve for the coefficients of the characteristic equation. ; S36. The coefficients calculated in S35 Substituting into the characteristic equation, the indoor design temperature is set as follows in the boundary conditions: Outdoor air temperature set to The outer membrane side length of the enclosure structure Set as Inner membrane side length Set to respectively , , , , , Perform a simulation; S37. Fit the convective heat transfer coefficient and the average thickness of the air gap in the simulation results to calculate the coefficient. ; S38. The coefficients calculated in S37 Substituting into the characteristic equation, the indoor design temperature is set as follows in the boundary conditions: Outdoor air temperature set to The outer membrane side length of the enclosure structure Set as Inner membrane side length Set to respectively , , , , , Simulation was conducted by changing the tilt angle of the enclosure structure. S39. Fit the convective heat transfer coefficient and tilt angle in the simulation results to obtain... ; S310, will Substitute the values ​​into the characteristic equation and calculate the coefficients of the characteristic equation based on any of the previously simulated operating conditions. .

6. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 5, characterized in that, In S32, the thermal conductivity of the outer membrane, air, insulation layer, and inner membrane are 0.22 W / (m·K), 0.0267 W / (m·K), 0.028 W / (m·K), and 0.214 W / (m·K), respectively; their specific heat capacities are 1360 J / (kg·℃), 1003 J / (kg·℃), 670 J / (kg·℃), and 1360 J / (kg·℃), respectively; and their densities are 1250 kg / m³. 3 1.205kg / m 3 48kg / m 3 and 1208kg / m 3 .

7. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 6, characterized in that, In S34, The value is 26℃. The value is 30℃. The value is 60℃.

8. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 7, characterized in that, In S38, the inclination angle of the enclosure structure increases sequentially from 0°, 10°, ... up to 70°.

9. The method for calculating the heat transfer coefficient of an air-supported membrane enclosure structure according to claim 8, characterized in that, In S6, the formula for calculating the overall heat transfer coefficient of the air-supported membrane enclosure structure is as follows: ； in, For the thermal resistance of the outer membrane, For the thermal resistance of the insulation layer, Thermal resistance of the inner membrane.

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