This standard is issued under the fixed designation C ; the number immediately 1 This test method is under the jurisdiction of ASTM Committee C- 16 on. ASTM C () Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus. Annual. Our calibrated hot box is one of the largest in the country accepting test assemblies up to 9’x16′. Its design allows any orientation from fully vertical to fully .
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This standard is not included in any packages. Air infiltration or moisture migration can alter the net heat transfer. Complicated interactions and dependence upon many variables, coupled with only a limited experience in testing under such conditions, have xstm it inadvisable to include this type testing in this standard.
If no applicable standard exists, sound engineering c136 that reflects accepted heat transfer principles ast, be used and documented. Already Subscribed to this document. Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.
For vertical specimens with air spaces that significantly affect thermal performance, the metering chamber dimension shall match the effective construction height. This test method does not establish test conditions, specimen configuration, or data acquisition details but leaves these choices to be made in a manner consistent with the specific application being considered.
However, larger hot boxes have been used to characterize projecting skylights and attic sections. By performing this benchmarking process, the hot box operator is able to develop the additional equations that predict the magnitude of the corrections to the net heat flow through the specimen that account for any hot box wall loss and flanking loss.
Some hot boxes are limited to planar or nearly planar specimens. During initial setup and periodic verification testing, each measurement system and sensor is calibrated against a standard traceable to a national standards laboratory. These panels, or representative sections of the panels, have had their thermal performance measured on other devices that are directly traceable or have been favorably compared to a national standards laboratory.
Further, some of the modeling parameters, such as contact resistance between the various layers, are difficult to establish accurately for modeling. Subscription pricing is determined by: Additional characterization is required to insure that all aspects of the heat flow and storage are accounted for during the test.
Some hot boxes are limited to planar or nearly planar specimens. The hot box test method is more suitable for providing such data for large building elements, usually of a built-up or composite nature, which are exposed to temperature-controlled air on both sides.
This test method applies to building structures or composite assemblies of building materials for which it is possible to build a representative specimen that fits the test apparatus. Second, each building material has different thermal conductivity and some materials, especially the wood framing members, are not uniformly distributed through the assembled wall system.
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Please first verify your email before subscribing to alerts. Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. The same apparatus may be used in several orientations but may require special design capability to permit repositioning to each orientation. Dynamic control strategies have included both periodic or non-periodic temperature cycles, for example, to follow a diurnal cycle.
The direction of airflow motion under forced convective conditions shall be either perpendicular or parallel to the surface.
Other ASTM standards such as Test Methods C and C provide data on homogeneous specimens bounded by temperature controlled flat impervious plates. Your Alert Profile lists the documents that will be monitored. Through our network of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range of industries around the world.
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Large-Scale Hot Box
However, several hot box apparatuses have been operated under dynamic non-steady-state conditions after additional characterization 1.
Detailed operating procedures, including design schematics and electrical drawings, shall be available for each apparatus to ensure that tests are in accordance with this test method. The preconditioning parameters shall be chosen to accurately reflect the test samples intended use and shall be documented in the report.
Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Approximately thermocouples measure air and surface temperatures on both sides of the Hot Box.
The general principles of the hot box method can be used to construct an apparatus to measure the heat flow through industrial systems at elevated temperatures. The hot box has two sides as illustrated in the diagram below: Test apparatus designed and operated previously under Test Methods C and C will require astk modifications to the calibration and operational procedures to meet the requirements of Test Method C Examples of analysis tools, concepts and procedures used in the design, construction, characterization, and operation of a hot box apparatus is given in Refs The key to an accurate result is correctly measuring the heat input to the hot side and ensuring that all atm heat goes from the hot side to the cold side and x1363 none either leaks out of the Hot Box or bypasses the test specimen.
Practice C may be used as a guide for test specimen conditioning. Journal ast Power and Energy EngineeringVol. To gain this final confidence in the test result, it is necessary to benchmark the overall result of the hot box apparatus by performing measurements on specimens having known heat transfer values and comparing those results to the expected values.
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The guarded hot box consists of a cold room and a warm room. However, several c3163 box apparatuses have been operated under dynamic non-steady-state conditions after additional characterization 1. Further considerations for such testing are given in Appendix X1. To gain this final confidence in the test result, it is necessary to benchmark the overall result of c13633 hot box apparatus by performing measurements on specimens having known heat transfer values and comparing those results to the expected values.
Additional characterization c13663 required to insure that all aspects of the heat flow and storage are accounted for during the test. In addition, there would be no temperature differences that would drive heat across the boundary of the metering chamber walls. The equipment performing these measurements requires calibration to ensure that the data are accurate. Finally, heat flow ast, this scenario is a three-dimensional phenomenon. Whatever the test orientation, the apparatus performance shall first be verified at that orientation with a specimen of known thermal resistance in place.
The operation of a hot box apparatus requires a significant number of fundamental measurements of temperatures, areas and power. Validating the specifications, value and safety of your raw materials, products and assets.