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GB/T 38588-2020   In-situ measurements of heat loss of insulating pipes for urban heat-supplying (English Version)
Standard No.: GB/T 38588-2020 Status:valid remind me the status change

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Language:English File Format:PDF
Word Count: 12500 words Price(USD):370.0 remind me the price change

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Implemented on:2021-2-1 Delivery: via email in 1 business day
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Standard No.: GB/T 38588-2020
English Name: In-situ measurements of heat loss of insulating pipes for urban heat-supplying
Chinese Name: 城镇供热保温管网系统散热损失现场检测方法
Chinese Classification: P46    Heat supply and heating engineering
Professional Classification: GB    National Standard
ICS Classification: 91.140.10 91.140.10    Central heating systems 91.140.10
Issued by: SAMR; SAC
Issued on: 2020-03-31
Implemented on: 2021-2-1
Status: valid
Language: English
File Format: PDF
Word Count: 12500 words
Price(USD): 370.0
Delivery: via email in 1 business day
In-situ measurements of heat loss of insulating pipes for urban heat-supplying 1 Scope This standard specifies the terms, definitions and symbols, test methods, test grading and use conditions, test requirements, data processing, test errors and test reports of in-situ measurements of heat loss of insulating pipes for urban heat-supplying. This standard is applicable to the in-situ measurement of heat loss of insulating pipes, pipe interfaces and their fittings (hereinafter referred to as pipelines) for urban heat-supplying with the hot water medium temperature less than or equal to 150 °C and the steam medium temperature less than or equal to 350 °C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 10295 Thermal insulation - Determination of steady-state thermal resistance and related properties - Heat flow meter apparatus GB/T 17357 In-situ measurements of heat loss through thermal insulation of equipments and pipes - Heat flow meter apparatus and surface temperature method JJF 1059.1-2012 Evaluation and expression of uncertainty in measurement 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 steady heat transfer heat transfer process in which the radial temperature at each point does not change with time in the thermal insulation structure layer of thermal insulation pipeline 3.1.2 heat flow meter apparatus method heat flux test method for directly measuring radial heat transfer of insulation construction of thermal insulation pipeline with thermal resistance type heat flux sensor (heat flux probe) and measurement indicator 3.1.3 surface temperature method heat flux test method for calculating radial heat transfer by measuring the outer surface temperature, ambient temperature, wind direction and speed, surface thermal emissivity and external dimensions of insulation construction 3.1.4 temperature difference method heat flux test method for calculating radial heat transfer of insulation construction by measuring the material thickness of each layer of insulation construction, the temperature on the interface of each layer and the thermal conductivity of each layer of materials at the service temperature 3.1.5 heat balance method method for calculating the whole heat loss value of the pipeline according to the enthalpy difference method or the principle of energy balance by in-situ measurement of the medium flow of the pipeline under test, the medium temperature and (or) pressure at the starting point and the end point of the pipeline under the stable operation state of pipe network system 3.1.6 pseudo steady state of transducer heat transfer state when the difference of average reading of the heat flux sensor is not greater than 2% and the difference of average reading of the temperature sensor at the same measuring point is not greater than 0.2 °C in two consecutive 5-minute cycles 3.1.7 heat flux heat passing through a unit cross-sectional area of an object per unit time 3.1.8 insulation construction generic term of insulating layer and protective cover 3.1.9 ground temperature natural temperature of soil at the same depth as the tested insulation construction, which is greater than or equal to 10 m away from the laying site of the tested insulation construction   3.2 Symbols For the purposes of this document, the following symbols apply. a1—the temperature factor, K3; CA—the calculation coefficient of approximate value of overall heat transfer coefficient for the outer surface of horizontal pipeline; CB—the calculation coefficient of approximate value of overall heat transfer coefficient for the outer surface of vertical pipeline; Cr—the radiation coefficient of material surface, W/(m2·K4);
Foreword i 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 Symbols 4 Test methods 4.1 Heat flow meter apparatus method 4.2 Surface temperature method 4.3 Temperature difference method 4.4 Heat balance method 5 Test grading and service conditions 5.1 Test grading and selection 5.2 Test apparatus 6 Test requirements 6.1 Test preparation 6.2 Layout of test sections and measuring points 6.3 Environmental conditions for test 6.4 Test procedures 7 Data processing 7.1 Data collation 7.2 Calculation of heat loss 8 Test error 8.1 Error analysis 8.2 Error range 9 Test report Annex A (Normative) Heat flux correction Annex B (Normative) Calculation of the overall heat transfer coefficient by surface temperature method Annex C (Normative) Investigation form of condition along the thermal insulation pipeline Annex D (Normative) Test data record form for heat loss of insulation construction of thermal insulation pipeline
Referred in GB/T 38588-2020:
*GB/T 10295-2008 Thermal insulation-Determination of steady-state thermal resistance and related properties - Heat flow meter apparatus
*GB/T 17357-2008 In-situ measurements of heat loss through thermal insulation of equipments and pipes—Heat flow meter apparatus and surface temperature method
*JJF 1059.1-2012 Evaluation and Expression of Uncertaintv in Measurement
Code of China
Standard
GB/T 38588-2020  In-situ measurements of heat loss of insulating pipes for urban heat-supplying (English Version)
Standard No.GB/T 38588-2020
Statusvalid
LanguageEnglish
File FormatPDF
Word Count12500 words
Price(USD)370.0
Implemented on2021-2-1
Deliveryvia email in 1 business day
Detail of GB/T 38588-2020
Standard No.
GB/T 38588-2020
English Name
In-situ measurements of heat loss of insulating pipes for urban heat-supplying
Chinese Name
城镇供热保温管网系统散热损失现场检测方法
Chinese Classification
P46
Professional Classification
GB
ICS Classification
Issued by
SAMR; SAC
Issued on
2020-03-31
Implemented on
2021-2-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
Language
English
File Format
PDF
Word Count
12500 words
Price(USD)
370.0
Keywords
GB/T 38588-2020, GB 38588-2020, GBT 38588-2020, GB/T38588-2020, GB/T 38588, GB/T38588, GB38588-2020, GB 38588, GB38588, GBT38588-2020, GBT 38588, GBT38588
Introduction of GB/T 38588-2020
In-situ measurements of heat loss of insulating pipes for urban heat-supplying 1 Scope This standard specifies the terms, definitions and symbols, test methods, test grading and use conditions, test requirements, data processing, test errors and test reports of in-situ measurements of heat loss of insulating pipes for urban heat-supplying. This standard is applicable to the in-situ measurement of heat loss of insulating pipes, pipe interfaces and their fittings (hereinafter referred to as pipelines) for urban heat-supplying with the hot water medium temperature less than or equal to 150 °C and the steam medium temperature less than or equal to 350 °C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 10295 Thermal insulation - Determination of steady-state thermal resistance and related properties - Heat flow meter apparatus GB/T 17357 In-situ measurements of heat loss through thermal insulation of equipments and pipes - Heat flow meter apparatus and surface temperature method JJF 1059.1-2012 Evaluation and expression of uncertainty in measurement 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 steady heat transfer heat transfer process in which the radial temperature at each point does not change with time in the thermal insulation structure layer of thermal insulation pipeline 3.1.2 heat flow meter apparatus method heat flux test method for directly measuring radial heat transfer of insulation construction of thermal insulation pipeline with thermal resistance type heat flux sensor (heat flux probe) and measurement indicator 3.1.3 surface temperature method heat flux test method for calculating radial heat transfer by measuring the outer surface temperature, ambient temperature, wind direction and speed, surface thermal emissivity and external dimensions of insulation construction 3.1.4 temperature difference method heat flux test method for calculating radial heat transfer of insulation construction by measuring the material thickness of each layer of insulation construction, the temperature on the interface of each layer and the thermal conductivity of each layer of materials at the service temperature 3.1.5 heat balance method method for calculating the whole heat loss value of the pipeline according to the enthalpy difference method or the principle of energy balance by in-situ measurement of the medium flow of the pipeline under test, the medium temperature and (or) pressure at the starting point and the end point of the pipeline under the stable operation state of pipe network system 3.1.6 pseudo steady state of transducer heat transfer state when the difference of average reading of the heat flux sensor is not greater than 2% and the difference of average reading of the temperature sensor at the same measuring point is not greater than 0.2 °C in two consecutive 5-minute cycles 3.1.7 heat flux heat passing through a unit cross-sectional area of an object per unit time 3.1.8 insulation construction generic term of insulating layer and protective cover 3.1.9 ground temperature natural temperature of soil at the same depth as the tested insulation construction, which is greater than or equal to 10 m away from the laying site of the tested insulation construction   3.2 Symbols For the purposes of this document, the following symbols apply. a1—the temperature factor, K3; CA—the calculation coefficient of approximate value of overall heat transfer coefficient for the outer surface of horizontal pipeline; CB—the calculation coefficient of approximate value of overall heat transfer coefficient for the outer surface of vertical pipeline; Cr—the radiation coefficient of material surface, W/(m2·K4);
Contents of GB/T 38588-2020
Foreword i 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 Symbols 4 Test methods 4.1 Heat flow meter apparatus method 4.2 Surface temperature method 4.3 Temperature difference method 4.4 Heat balance method 5 Test grading and service conditions 5.1 Test grading and selection 5.2 Test apparatus 6 Test requirements 6.1 Test preparation 6.2 Layout of test sections and measuring points 6.3 Environmental conditions for test 6.4 Test procedures 7 Data processing 7.1 Data collation 7.2 Calculation of heat loss 8 Test error 8.1 Error analysis 8.2 Error range 9 Test report Annex A (Normative) Heat flux correction Annex B (Normative) Calculation of the overall heat transfer coefficient by surface temperature method Annex C (Normative) Investigation form of condition along the thermal insulation pipeline Annex D (Normative) Test data record form for heat loss of insulation construction of thermal insulation pipeline
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Keywords:
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