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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Home Innovation ASTM C Hot Box | Home Innovation Research Labs

Some hot boxes are limited to planar or nearly planar specimens. 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. Test apparatus designed and operated previously under Test Methods C and C will require slight modifications to the calibration and operational procedures to meet the requirements of Test Method C Additional characterization is required to insure that all aspects of the heat flow and storage are accounted for during the test.

Air infiltration or moisture migration can alter the net heat transfer. Temperatures are maintained in the two rooms until steady-state conditions have been met for temperature on both sides and energy input to the warm side. The direction of airflow motion under forced convective conditions shall be either perpendicular or parallel to the surface.

This method is also used to measure the thermal performance of a building material at standardized test conditions such as those required in material Specifications CCC and Practice C Practice C may be used as a guide for test specimen conditioning.

Detailed designs conforming to this standard are not given but must be developed within the constraints of the general requirements. Other ASTM standards such as Test Methods C and C provide data on homogeneous specimens bounded by temperature controlled flat impervious plates.


When constructed to measure heat transfer in the vertical direction, the hot box is used for testing roof, ceiling, floor, and other horizontal structures. Whatever the test orientation, the apparatus performance shall first be verified at that orientation with a specimen of known thermal resistance in place. For the results to be representative of a building construction, only representative sections shall be tested. Further, some of the modeling parameters, such as contact resistance between the various layers, are difficult to establish accurately for modeling.

Detailed designs conforming to this standard are not given but must be developed within the constraints of the general requirements. In addition, there would be no temperature differences that would drive heat across the boundary of the metering chamber walls.

The energy input to the hot side is precisely measured for both the power to the heater and the power to the circulating fan. For example, in some specimens, especially those containing empty cavities or cavities open to one surface, the overall resistance or transmittance will depend upon the temperature difference across the test specimen due to internal convection.

The test utilizes an apparatus known as a guarded hot box. The general testing procedures for these cases are described in Annex A However, larger hot boxes have been used to characterize projecting skylights and attic sections.

This benchmarking provides substantial confidence that any extraneous heat flows can be eliminated or quantified with sufficient accuracy f1363 be a minor factor of the overall uncertainty. Your Alert Profile lists the documents that will be monitored. Materials with a low thermal emittance surface have been used for many years to create reflective insulations that reduce the rate of heat flow across building envelopes.

The heat flow meter reading atsm proportional to the amount of energy not going through the test specimen. Trends Leading the way with innovative, fresh ideas for builders and manufacturers.


Add to Alert PDF. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine asttm applicability of regulatory limitations prior to use. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM C1363

Already Subscribed to this document. Assurance Enabling you to f1363 and mitigate the intrinsic risk in your operations, supply chains and business processes. 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. Additional characterization is required to insure that all aspects of c363 heat flow and storage are accounted for during the test.

We have no amendments or corrections for this standard. For more information on our thermal testing capabilities click here. Link to Active This link will always route to the current Active version of the standard. The dimensions of specimen projections or recesses are controlled by the design of the hot box apparatus. Dynamic control strategies have included both periodic or non-periodic temperature cycles, for example, to follow a diurnal cycle.

Large-Scale Hot Box

Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. 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.

You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Further considerations for such testing are given in Appendix X1.