Designation: C – 89 (Reapproved )e1Standard Practice for Determination of Heat ASTM Standards: Q t 5 total time rate of heat flow, Btu/h (W). Already shared in my big collection, check there for more. C Standard Practice for Estimate of the Heat Gain or Loss and the Surface. If someone has the ASTM C standard, please confirm an item. I have and old magazine (HPAC, Nov. 94) article for calculations for.

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ASTM C680 – 14

For example, the condensation of the gaseous portions of thermal insulation in extremely cold conditions will have an extremely influential effect on the apparent thermal conductivity of the insulation. The exterior surface temperature of the insulation is often shown to provide information on personnel protection or surface condensation. Copyright Compu-tecture, Inc. The computer program is wstm for flat slab, pipe and hollow sphere insulation systems.

Persons using this practice must have a knowledge of the practical application of heat cc680 theory relating to thermal insulation materials and systems. 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.

FORMAT Single User Subscription Site License Subscription BOOKS All Books PACKAGES All Packages EDITION to PUBLISHER. To date, there is no accepted system of metric dimensions for pipe and insulation systems for cylindrical shapes.

Persons using this practice must have a knowledge of the practical application of heat transfer theory relating to thermal insulation materials and systems.

Join your peers on the Internet’s largest technical engineering professional community. The use of this practice by both manufacturers and users of thermal insulation will provide standardized engineering data of sufficient accuracy for predicting thermal insulation system performance.


With the existence of radiation and convection modes of heat transfer, the measured value should be called apparent thermal conductivity as described in Terminology C C Terminology Relating to Thermal Insulation.

The main reason for this is that the premise for pure heat conduction is no longer valid, because the other modes of heat transfer obey different laws.

Certain applications may need specific data to produce meaningful results. The range and quality of the physical and thermal property data of the materials comprising the thermal insulation system limit the calculation accuracy.

ASTM C – Heat Transfer & Thermodynamics engineering – Eng-Tips

The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Also, if you examine the equation, it appears that the higher the average air film temp, the lower the Hcv becomes, approaching 0. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Search book title Enter keywords for book title search. For each test case, the results for heat flow and surface temperature must be identical within resolution of the method to those obtained using the practice described herein. The computer controls the terminal interactively with program-generated instructions and questions, which prompts user response.

Under this system, intermediate output guides the user to make programming adjustments to the input parameters as necessary. It’s easy to join and it’s free. The range and quality of the physical and thermal property data of the materials comprising the thermal insulation system limit the calculation accuracy.

Red Flag This Post Please let us know here why this post is inappropriate. For this reason, the convective surface coefficient calculation cannot be expected to be accurate at each location on the surface unless the wind velocity measurements are made close to the surface and a separate set of equations are applied that calculate the local surface coefficients. Link to Active This link will always route to the current Active version of the standard.


When an international standard for piping and insulation sizing occurs, this practice can be rewritten to meet those needs. The Eng-Tips staff will check this out and take appropriate action. The values given in parentheses are for information only. The dimensions used in Europe are the SI equivalents of American sizes based on Practice Cand each has a different designation in each country.

Also, additional calculations may be desired to include other data such as system costs or economic thickness. Therefore, no SI version of the practice has been prepared, because a standard SI equivalent of this practice would be complex. Air blowing across real objects often follows flow directions and velocities much different from the direction and velocity of the main free stream. Thanks for replies cc680 advance.

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This book also exists in the following packages In the cylindrical coordinate system, C608 C can be applied to radial heat flows for all types of piping circuits. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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