GB/T 4271-2021Test methods for the performance of solar collectors (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1. Structure and Drafting Rules of Standardization Documents" drafted.

This document replaces GB/T 4271-2007 "Test method for thermal performance of solar collectors". Compared with GB/T 4271-2007, except for the In addition to structural adjustments and editorial changes, the main technical changes are as follows:

a) Changed the type of applicable collector (see Chapter 1, Chapter 1 of the 2007 edition);

b) Added the pressure test of liquid flow channel (see Chapter 5);

c) Added standard stagnation temperature test (see Chapter 6);

d) Added air exposure test (see Chapter 7);

e) Added external thermal shock test (see Chapter 8);

f) Added the internal thermal shock test (see Chapter 9);

g) added the rain test (see Chapter 10);

h) Added frost resistance test (see Chapter 11);

i) Added mechanical load test (see Chapter 12);

j) Added impact resistance test (see Chapter 13);

k) Added direct radiation parameter measurement (see 14.4.3);

l) The thermal performance test of medium and high temperature concentrating tracking collectors such as trough type and photovoltaic photothermal composite collectors has been added (see Chapter 14);

m) Changed the test requirements for inlet temperature (see 14.6.4, 8.1.4 of the 2007 edition);

n) increased the peak power and output power of the collector (see 14.7.2);

o) The test method for the effective heat capacity of the collector has been changed (see 14.8.2, 10.2 of the 2007 edition).

1 Scope

This document specifies the withstand voltage, standard stagnation temperature, air exposure, external thermal shock, internal thermal shock, Test methods for rain, frost resistance, mechanical load, impact resistance, thermal properties and pressure drop.

This document applies to laboratory and field tests of liquid working fluid collectors and photovoltaic-photothermal composite solar collectors.

This document does not apply to thermal storage solar collectors with integrated thermal storage and collectors, nor does it apply to solar collectors without transparent covers Collector.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 12936 Terms for Solar Thermal Utilization

GB/T 17683.1 Solar Spectral Irradiance Standard Part 1. Atmospheric Quality 1.5 The normal direct insolation and hemispherical insolation irradiance of

GB/T 19565 Pyranometer

GB/T 33701 Longwave Pyranometer

ISO 9806:2017 Test methods for solar thermal collectors (Solarenergy-Solarthermalcollectors- Testmethods)

3 Terms and Definitions

Terms and definitions defined in GB/T 12936, GB/T 19565 and ISO 9806:2017 and the following terms and definitions apply to this document.