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ASTM C1041-85(2001)

(Practice)

Standard Practice for In-Situ Measurements of Heat Flux in Industrial Thermal Insulation Using Heat Flux Transducers

Standard Practice for In-Situ Measurements of Heat Flux in Industrial Thermal Insulation Using Heat Flux Transducers

SCOPE
1.1 This practice covers the in-situ measurement of heat flux through industrial thermal insulation using a heat flux transducer (HFT).
1.2 This practice estimates the thermal transport properties of thermal insulation materials in-situ in field applications under pseudo steady-state conditions. It is not intended that this practice should be used as a substitute for more precise laboratory procedures such as Test Methods C 177, C 335, or C 518.
1.3 This practice is limited by the relatively small area that can be covered by an HFT and by the transient effects of environmental conditions.
1.4 Temperature limitations shall be as specified by the manufacturer of the HFT.
1.5 While accurate values of heat flux are highly depend-ent upon proper calibrations under the conditions of use, manufacturer's calibrations may be used with confidence for comparative work between similar materials, aging, or other conditions of use.
Note 1—Further information may be found in the literature  (1-6).
1.6 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.

General Information

Status
Historical
Publication Date
25-Jul-1985
ICS
27.220 - Heat recovery. Thermal insulation
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.30 - Thermal Measurement
Current Stage
Ref Project

Relations

Replaced By
ASTM C1041-85(2007) - Standard Practice for In-Situ Measurements of Heat Flux in Industrial Thermal Insulation Using Heat Flux Transducers
Effective Date
01-May-2007

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ASTM C1041-85(2001) - Standard Practice for In-Situ Measurements of Heat Flux in Industrial Thermal Insulation Using Heat Flux TransducersASTM C1041-85(2001) - Standard Practice for In-Situ Measurements of Heat Flux in Industrial Thermal Insulation Using Heat Flux Transducers
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ASTM C1041-85(2001) - Standard Practice for In-Situ Measurements of Heat Flux in Industrial Thermal Insulation Using Heat Flux Transducers
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Standards Content (Sample)

Designation: C 1041 – 85 (Reapproved 2001)
Standard Practice for
In-Situ Measurements of Heat Flux in Industrial Thermal
1
Insulation Using Heat Flux Transducers
This standard is issued under the fixed designation C 1041; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope C 518 Test Method for Steady-State Thermal Transmission
3
Properties by Means of the Heat Flow Meter Apparatus
1.1 This practice covers the in-situ measurement of heat flux
E 220 Method for Calibration of Thermocouples by Com-
through industrial thermal insulation using a heat flux trans-
4
parison Techniques
ducer (HFT).
E 230 Temperature Electromotive Force (EMF) Tables for
1.2 This practice estimates the thermal transport properties
4
Standardized Thermocouples
of thermal insulation materials in-situ in field applications
2.2 Other Standards:
under pseudo steady-state conditions. It is not intended that this
ASHRAE Standard 101-1981; Application of Infrared
practice should be used as a substitute for more precise
Sensing Devices to the Assessment of Building Heat Loss
laboratory procedures such as Test Methods C 177, C 335, or
5
Characteristics
C 518.
ISO/TC 163/SC 1WG N31E Thermal Insulation—
1.3 This practice is limited by the relatively small area that
Qualitative Detection of Thermal Irregularities in Building
can be covered by an HFT and by the transient effects of
6
Envelopes—Infrared Method
environmental conditions.
1.4 Temperature limitations shall be as specified by the
3. Terminology
manufacturer of the HFT.
3.1 Definitions:
1.5 While accurate values of heat flux are highly depend-ent
3.1.1 heat flux transducer (HFT)—a rigid or flexible trans-
upon proper calibrations under the conditions of use, manufac-
ducer in a durable housing comprised of a thermopile or
turer’s calibrations may be used with confidence for compara-
equivalent for sensing the temperature drop across a thin
tive work between similar materials, aging, or other conditions
thermal resistance layer which gives a voltage output propor-
of use.
tional to the heat flux through the transducer.
2
NOTE 1—Further information may be found in the literature (1-6).
3.1.1.1 belt HFT—a heat flux transducer having a belt-like
1.6 This standard does not purport to address all of the configuration such that the unit can be wrapped helically
around a section of pipe insulation (see Fig. 1).
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1.1.2 spot HFT—a small heat flux transducer having a
round, square, rectangular or other configuration for the
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. sensitive area (see Fig. 1).
3.1.2 pseudo steady state of HFT—the criterion for pseudo
2. Referenced Documents
steady-state condition is that the average HFT reading over two
2.1 ASTM Standards: consecutive 5-min periods does not differ by more than 2 %.
3
C 168 Terminology Relating to Thermal Insulation Since the time constant of an HFT is typically less than or of
C 177 Test Method for Steady-State Heat Flux Measure- the order of 1 min, using a time interval of 5 min ensures that
ments and Thermal Transmission Properties by Means of the transient effects in the HFT are averaged.
3
the Guarded-Hot-Plate Apparatus 3.2 Symbols:Symbols:
C 335 Test Method for Steady-State Heat Transfer Proper- 3.2.1 Q—heat flow, W (Btu/h).
3 2 2
ties of Horizontal Pipe Insulation 3.2.2 q—heat flux, W/m (Btu/h·ft ).
3.2.3 C—overall conductance of the insulated section,
2 2
W/m ·K (Btu/h·ft · °F).
1
This practice is under the jurisdiction of ASTM Committee C16 on Thermal 3.2.4 t —process surface temperature,° C(°F).
0
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
Measurement.
4
Current edition approved July 26, 1985. Published September 1985. Annual Book of ASTM Standards, Vol 14.03.
2 5
The boldface numbers in parentheses refer to the list of references at the end of Available from ASHRAE, Inc., 1791 Tullie Circle NE, Atlanta, GA 30329.
6
this standard. Available from International Standards Organization, 1 Rue de Varembe, Case
3
Annual Book of ASTM Standards, Vol 04.06. Postale 56, CH-1211, Geneva 20, Switzerland.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C 1041
because modest changes in ambient conditions have but
minimal effects on HFT output.
5.5 While it would be ideal for the HFT and attachment
system to have zero thermal resistance, this factor is insignifi-
cant to the measured result if kept to 5 % or less of the
resistance of the insulating section being tes
...

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FIG. 3 Hinged Section Measurement Location
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1.1.1 Procedure A is applicable to sections of one-piece pipe covering or to sections of segmental pipe covering that can be joined together concentrically and measured as one-piece.  
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