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GB/T 27698.3-2023 PDF English

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GB/T 27698.3-2023: Test methods for the performance of heat exchangers and heat exchange elements - Part 3: Heat exchanger elements
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GB/T 27698.3: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 27698.3-2023245 Add to Cart Auto, 9 seconds. Test methods for the performance of heat exchangers and heat exchange elements - Part 3: Heat exchanger elements Valid
GB/T 27698.3-2011239 Add to Cart 2 days Test method for the performance of heat exchangers and heat exchange element -- Part 3: Plate heat exchanger Obsolete

Similar standards

GB/T 27698.2   GB/T 151   NB/T 47006   GB/T 28712.1   

GB/T 27698.3-2023: Test methods for the performance of heat exchangers and heat exchange elements - Part 3: Heat exchanger elements


---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT27698.3-2023
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.060.30 CCS J 75 Replacing GB/T 27698.5-2011, GB/T 27698.6-2011 Test methods for the performance of heat exchangers and heat exchange elements - Part 3: Heat exchanger elements ISSUED ON: SEPTEMBER 07, 2023 IMPLEMENTED ON: SEPTEMBER 07, 2023 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword ... 3 Introduction ... 6 1 Scope ... 7 2 Normative references ... 7 3 Terms and definitions ... 7 4 Symbols and units ... 8 5 Product model and test sample parameters ... 9 5.1 Heat transfer tubes ... 9 5.2 Heat transfer tube bundles ... 9 5.3 Heat transfer plate bundles ... 10 6 Vapor-liquid and liquid-liquid performance tests ... 10 7 Vapor-gas condensation test method ... 10 7.1 Test system ... 10 7.2 Measuring instruments ... 12 7.3 Measurement method ... 12 8 Vapor-gas condensation test conditions and measurement parameters ... 14 8.1 Test conditions ... 14 8.2 Measurement parameters ... 15 9 Vapor-gas condensation test procedure ... 15 10 Vapor-gas condensation test data processing ... 16 10.1 Data calculation ... 16 10.2 Performance determination ... 17 11 Error and uncertainty ... 18 12 Test report ... 18 Test methods for the performance of heat exchangers and heat exchange elements - Part 3: Heat exchanger elements

1 Scope

This document describes the test methods, test conditions, measurement parameters, test procedures, test data processing and test report requirements for heat transfer elements used in heat exchangers. This document applies to the performance test of heat transfer tubes and tube bundles, and heat transfer plate bundles for heat exchangers.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 1236, Industrial fan - Performance testing using standardized airways GB/T 27698.1, Test methods for the performance of heat exchangers and heat exchange elements - Part 1: General requirements GB/T 27698.2, Test methods for the performance of heat exchangers and heat exchange elements - Part 2: Heat exchangers NB/T 47007, Air-cooled heat exchangers

3 Terms and definitions

For the purpose of this document, the following terms and definitions, as well as those given in GB/T 27698.1, GB/T 27698.2 and NB/T 47007 apply. 3.1 test sample Heat transfer elements for testing heat transfer performance and flow properties. 3.2 5.3 Heat transfer plate bundles When testing the heat transfer plate bundles, the product model and the following parameters shall be clearly stated: a) Plate corrugation form (corrugation angle, corrugation depth, corrugation spacing, mixing angle); b) Plate geometric dimensions (length, width, corner hole diameter, longitudinal and transverse center distance); c) Heat transfer area of a single plate; d) Spacing between plates; e) Flow channel cross-sectional area; f) Plate thickness; g) Plate material; h) Number of plates.

6 Vapor-liquid and liquid-liquid performance tests

When conducting vapor-liquid condensation performance test, vapor-liquid flow boiling and evaporation performance test, pool boiling heat transfer performance test and liquid-liquid no-phase-change performance test on heat transfer tubes and tube bundles, as well as heat transfer plate bundles, the heat exchange elements should be made into shell-and-tube, tubular or plate-and-shell heat exchanger test samples, and the tests and data processing should be carried out in accordance with the provisions of GB/T 27698.1 and GB/T 27698.2.

7 Vapor-gas condensation test method

7.1 Test system The test device consists of two parts: the air system and the stream system. The air system shall have a pretreatment section and a measuring section. The pretreatment section shall ensure that the air reaches a stable state suitable for testing. The wind speed measuring section of the air system shall ensure a certain length of straight tube section to meet the requirements for the use of the measuring instrument. To ensure stable air flow through the test sample, the length of the working section of the air duct shall not be less than 1.5 m. There is no uniform regulation for the cross-sectional width within the working section of the air duct, but the air mass flow rate at the effective venting area shall meet the test requirements. The test system is shown in Figure 1. 2 - exhaust valve; 3 - liquid level gauge; 4 - condensate tank; 5 - trap; 6 - subcooler; 7 - regulating valve; 8 - weighing device; a - temperature measuring point; b - pressure measuring point. Figure 2 – Schematic diagram of condensate flow measurement system 7.3.1.2 The air flow rate can be measured by an anemometer, whose installation and operation procedures shall be carried out according to the instruction manual; it can also be measured by an orifice plate or a Pitot static pressure tube, where the measurement method shall comply with the provisions of GB/T 1236. 7.3.2 Temperature measurement 7.3.2.1 The working end of the temperature measuring element shall be located at the center of the pipeline or working section cross section, and its insertion depth shall not be less than the pipeline radius or the center of the working section cross section. When measuring in a narrow pipeline, a measuring section can be installed and the working end of the temperature measuring element shall be opposite to the flow direction. 7.3.2.2 The temperature measuring element shall be set at the specified position of the measuring section (see Figure 1), and the pipeline and air duct shall be well insulated. The upstream (inlet) and downstream (outlet) range of 600 mm of the temperature measuring point shall also be insulated. 7.3.2.3 The air inlet and outlet temperatures shall only be measured as dry bulb temperature. There should be no less than three temperature measurement points on each testing section, and the average value should be taken. 7.3.3 Pressure measurement 7.3.3.1 Steam pressure and air pressure shall be measured using a standard pressure gauge or a pressure transmitter. The installation and operation procedures shall be carried out in accordance with the instruction manual. 7.3.3.2 The ambient atmospheric pressure shall be measured using a mercury barometer. The installation and operation procedures shall be carried out in accordance with the instruction manual. 7.3.3.3 The air pressure measuring hole in the air duct shall be perpendicular and flush with the inner surface of the air duct; all internal protrusions shall be removed; the edge of the hole shall be rounded; the diameter of the hole shall not be less than 1.5 mm and not more than 5 mm. 7.3.3.4 The air pressure measuring holes in the air duct shall be set on the section about 0.5 m away from the test sample. Four pressure measuring holes should be set on each pressure measuring section of the rectangular channel, and the measuring holes should be distributed at the centers of the four sides of the section. 7.3.4 Humidity measurement 7.3.4.1 For laboratory humidity measurement, wet and dry bulb hygrometer, hair hygrometer, capacitance hygrometer or resistance hygrometer should be used. 7.3.4.2 The installation and operation procedures of the hygrometer shall be carried out in accordance with the instruction manual.

8 Vapor-gas condensation test conditions and measurement

parameters 8.1 Test conditions 8.1.1 All steam piping systems shall be insulated. 8.1.2 The entire length of the test sample, except the testing section, shall be insulated. The superheat of steam entering the test sample shall be maintained in the range of 1 ℃ ~ 3 ℃. 8.1.3 If the weighing method is used to measure the condensate, in order to prevent the condensate from evaporating again, the subcooling degree of the condensate entering the metering device shall be at least 2 °C. 8.1.4 The test sample shall be installed straight and tilted downward by 1° ~ 3° toward the steam condensate outlet. 8.1.5 The testing section shall be selected in the middle of the test sample. The length of the heat transfer tube test sample shall not be less than 500 mm. The length and width of the heat transfer tube bundle test sample shall not be less than 600 mm × 600 mm. The tube bundle shall not be less than 3 rows in the air flow direction. The length of the heat transfer plate bundle test sample shall not be less than 600 mm. The number of single-side flow channels shall not be less than 10. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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