Introduction
Performance test is the most accurate method to determine the flow and heat exchange characteristics of heat exchangers and heat exchange elements. In order to ensure the orderly development of performance test, GB/T 27698 aims to establish a test system, test conditions, data processing methods and test report requirements which are generally applicable to the performance test of heat exchangers and heat exchange elements. It is planned to be composed of four parts.
——Part 1: General requirements, which aims to establish common requirements for test system, measuring instruments, measuring methods, data processing methods and test reports for performance test of various types of heat exchangers and heat transfer elements.
——Part 2: Heat exchangers, which aims to establish the product parameter information, test program, data processing results and test report requirements when testing the performance of various typical heat exchangers.
——Part 3: Heat exchange elements, which aims to establish the steam-gas condensation test method, product parameter information, test program, data processing results and test report requirements for performance test of various typical heat exchange elements.
——Part 4: Measurement of noise from air-cooled heat exchangers, which aims to establish the requirements for test paper parameters, test environment, test instruments, test methods and test report of noise measurement of air-cooled heat exchangers.
It is unnecessary and impossible for GB/T 27698 to cover all the technical details for the performance test of heat exchangers and heat exchange elements, so under the premise of satisfying the accuracy requirements, the technical contents not specially mentioned in this document shall not be banned.
GB/T 27698 does not ban the use of advanced testing techniques and methods in performance test, but engineers and technicians should make reliable judgments on their scientificity and accuracy when adopting advanced technical methods.
Test methods for the performance of heat exchangers and heat exchange elements - Part 2: Heat exchangers
1 Scope
This document describes the performance test procedure, test data processing and test report requirements of the heat exchangers.
This document is applicable to the performance test of tubular heat exchangers (including sleeve heat exchangers), plate heat exchangers (including welded plate heat exchangers, brazed plate heat exchangers) and spiral heat exchangers.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 151 Heat exchangers
GB/T 27698.1 Test methods for the performance of heat exchangers and heat exchange elements - Part 1: General requirements
NB/T 47004.1 Plate heat exchangers - Part 1: Plate-and-frame heat exchangers
NB/T 47004.2 Plate heat exchangers - Part 2: Welded plate heat exchangers
NB/T 47045 Brazed plate heat exchangers
NB/T 47048 Spiral plate heat exchangers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 27698.1 and the following apply.
standard condition
operating condition used for characterizing the performance of a heat exchanger
reference temperature
reference temperature of working medium physical properties which is selected during calculation
Note: The arithmetic average of inlet and outlet temperatures of working medium is usually selected.
4 Product model and sample parameters
4.1 Tubular heat exchangers
4.1.1 If testing a tubular heat exchanger, its product model and the following parameters shall be specified:
a) Shell pass structure and geometric dimension;
b) Form and geometric dimension of heat exchanger tubes;
c) Arrangement of heat exchanger tubes:
d) Spacing between tubes;
e) Form and arrangement of baffle elements;
f) Flow path;
g) Equivalent diameter of tube side and shell side;
h) Actual internal area of tube side and shell side;
i) Material of heat exchange tube;
j) Heat exchange area;
k) Design temperature;
l) Design pressure.
The above structure and design data shall be determined according to the requirements of GB/T 151 and GB/T 27698.1.
4.1.2 If the product model or any of the parameters a) ~ g) in 1.1.1 changes, the performance test shall be conducted again.
Foreword i
Introduction iv
1 Scope
2 Normative references
3 Terms and definitions
4 Product model and sample parameters
4.1 Tubular heat exchangers
4.2 Plate heat exchangers
4.3 Spiral plate heat exchangers
5 Procedure
5.1 Performance test for liquid-liquid phase-free turbulence
5.2 Performance test for liquid-liquid phase-free low flow rate
5.3 Vapor-liquid condensation performance test
5.4 Vapor-liquid flow boiling and evaporation performance test
5.5 Pool boiling heat exchange performance test
6 Processing of test data
6.1 Liquid-liquid phase-free performance test
6.2 Vapor-liquid condensation performance test
6.3 Vapor-liquid flow boiling and evaporation performance test
6.4 Pool boiling heat exchange performance test
7 Error and uncertainty
8 Test report
