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ASTM C 177

Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus

Số trang: 22
Ngày phát hành: 2004-00-00

Liên hệ
1.1 This test method establishes the criteria for the laboratory measurement of the steady-state heat flux through flat, homogeneous specimen(s) when their surfaces are in contact with solid, parallel boundaries held at constant temperatures using the guarded-hot-plate apparatus. 1.2 The test apparatus designed for this purpose is known as a guarded-hot-plate apparatus and is a primary (or absolute) method. This test method is comparable, but not identical, to ISO 8302. 1.3 This test method sets forth the general design requirements necessary to construct and operate a satisfactory guarded-hot-plate apparatus. It covers a wide variety of apparatus constructions, test conditions, and operating conditions. Detailed designs conforming to this test method are not given but must be developed within the constraints of the general requirements. Examples of analysis tools, concepts and procedures used in the design, construction, calibration and operation of a guarded-hot-plate apparatus are given in Refs . 1.4 This test method encompasses both the single-sided and the double-sided modes of measurement. Both distributed and line source guarded heating plate designs are permitted. The user should consult the standard practices on the single-sided mode of operation, Practice C 1044, and on the line source apparatus, Practice C 1043, for further details on these heater designs. 1.5 The guarded-hot-plate apparatus can be operated with either vertical or horizontal heat flow. The user is cautioned however, since the test results from the two orientations may be different if convective heat flow occurs within the specimens. 1.6 Although no definitive upper limit can be given for the magnitude of specimen conductance that is measurable on a guarded-hot-plate, for practical reasons the specimen conductance should be less than 16 W/(m2K). 1.7 This test method is applicable to the measurement of a wide variety of specimens, ranging from opaque solids to porous or transparent materials, and a wide range of environmental conditions including measurements conducted at extremes of temperature and with various gases and pressures. 1.8 Inhomogeneities normal to the heat flux direction, such as layered structures, can be successfully evaluated using this test method. However, testing specimens with inhomogeneities in the heat flux direction, such as an insulation system with thermal bridges, can yield results that are location specific and shall not be attempted with this type of apparatus. See Test Methods C 976 or C 236 for guidance in testing these systems. 1.9 Calculations of thermal transmission properties based upon measurements using this method shall be performed in conformance with Practice C 1045. 1.10 In order to ensure the level of precision and accuracy expected, persons applying this standard must possess a knowledge of the requirements of thermal measurements and testing practice and of the practical application of heat transfer theory relating to thermal insulation materials and systems. Detailed operating procedures, including design schematics and electrical drawings, should be available for each apparatus to ensure that tests are in accordance with this test method. In addition, automated data collecting and handling systems connected to the apparatus must be verified as to their accuracy. This can be done by calibration and inputting data sets, which have known results associated with them, into computer programs. 1.11 It is not practical for a test method of this type to establish details of design and construction and the procedures to cover all contingencies that might offer difficulties to a person without technical knowledge concerning theory of heat flow, temperature measurements and general testing practices. The user may also find it necessary, when repairing or modifying the apparatus, to become a designer or builder, or both, on whom the demands for fundamental understanding and careful experimental technique are even greater. Standardization of this test method is not intended to restrict in any way the future development of new or improved apparatus or procedures. 1.12 This test method does not specify all details necessary for the operation of the apparatus. Decisions on sampling, specimen selection, preconditioning, specimen mounting and positioning, the choice of test conditions, and the evaluation of test data shall follow applicable ASTM Test Methods, Guides, Practices or Product Specifications or governmental regulations. If no applicable standard exists, sound engineering judgment that reflects accepted heat transfer principles must be used and documented. 1.13 This test method allows a wide range of apparatus design and design accuracy to be used in order to satisfy the requirements of specific measurement problems. Compliance with this test method requires a statement of the uncertainty of each reported variable in the report. A discussion of the significant error factors involved is included. 1.14 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. Either SI or Imperial units may be used in the report, unless otherwise specified. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Note 0. 1.15 Major sections within this test method are arranged as follows:
Số hiệu tiêu chuẩn
ASTM C 177
Tên tiêu chuẩn
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Ngày phát hành
2004-00-00
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Tiêu chuẩn tương đương
Tiêu chuẩn liên quan
Thay thế cho
ASTM C 177 (1997)
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 1997-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
Thay thế bằng
ASTM C 177 (2010)
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 2010-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
Lịch sử ban hành
ASTM C 177 (2013)
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 2013-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM C 177 (2010)
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 2010-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM C 177 (2004)
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 2004-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM C 177 (1997)
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 1997-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM C 177 (1985)
Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 1985-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM C 177 (1976)
Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 1976-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM C 177 (1971)
Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
Số hiệu tiêu chuẩn ASTM C 177
Ngày phát hành 1971-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM D 325 (1931)
Method of Test for Comparing Thermal Conductivities of Solid Electrical Insulating Materials
Số hiệu tiêu chuẩn ASTM D 325
Ngày phát hành 1931-00-00
Mục phân loại 17.200.10. Nhiệt. Phép đo nhiệt lượng
Trạng thái Có hiệu lực
* ASTM C 177 (2004) * ASTM C 177 (1997) * ASTM C 177 (1985) * ASTM C 177 (1976) * ASTM C 177 (1971) * ASTM C 177 (1963)
Từ khóa
Construction * Heat transfer * Plastics * Test equipment * Testing * Thermal insulation * Thermal protection
Số trang
22