GB 26969-2025 Minimum allowable values of energy efficiency and energy efficiency grades for domestic solar water heating systems English, Anglais, Englisch, Inglés, えいご
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ICS27.010
CCSF01
ational Standard of the People's Republic of China
GB26969-2025
Replaces GB26969-2011
Minimum allowable values of energy efficiency and energy efficiency grades for domestic solar water heating systems
Issued on August 1, 2025 Implementation on August 1, 2026
State Administration for Market Regulation, National Standardization Administration
Contents
Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Energy efficiency rating
5 Technical Requirements
6 Test and calculation methods
Appendix A (Informative) Example of Calculating the Energy Efficiency Coefficient of a Domestic Solar Water Heating System
Table 1 Energy efficiency ratings of compact domestic solar water heating systems
Table 2 Energy efficiency rating of separated indirect (split double circuit) domestic solar water heating system
Table 3 Energy efficiency rating of split direct (split single circuit) domestic solar water heating system
Table 4 Energy efficiency ratings of sun-heated domestic solar water heating systems
Table 5 Energy efficiency ratings of domestic solar water heating systems for heating
Table 6 Minimum daily heat gain and maximum average heat loss factor of domestic solar water heating systems
Minimum allowable values of energy efficiency and energy efficiency grades for domestic solar water heating systems
1 Scope
This document specifies the energy efficiency ratings, technical requirements, testing and calculation methods for domestic solar water heating
systems. This document applies to solar water heating systems with a water storage tank volume not exceeding 0.6m3.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references. For dated references, only the version corresponding to that date applies to this document. For undated references, the latest version (including all amendments) applies to this document.
GB3100 International System of Units and its application
GB/T12936 Terminology for Solar Thermal Utilization
GB/T18708 Test method for thermal performance of domestic solar water heating systems
GB/T19141 Technical requirements for domestic solar water heating systems
3 Terms and Definitions
The terms and definitions defined in GB3100, GB/T12936, GB/T18708 and GB/T19141 and the following terms and definitions apply to this document.
3.1
Coefficient of thermal performance of domestic solar water heating system;CTP
Under the test conditions specified in the standard, the ratio of the measured value of daily heat use of domestic solar water heating system to the value specified in the standard and the average heat The comprehensive coefficient of the ratio of the measured value of the loss factor to the value specified in the standard.
3.2
Domestic solar water heating system energy efficiency limit value minimumallowablevaluesofenergyefficiencyfordomesticsolar waterheatingsystem Under the test conditions specified in the standard, the
minimum value of the energy efficiency coefficient allowed for domestic solar water heating systems.
3.3
Energy efficiency grades for domestic solar water heating systems represent a grading method for the energy efficiency of domestic solar water heating systems, which are divided into levels 1, 2 and 3, with level 1 indicating the highest energy efficiency.
4 Energy efficiency levels
The energy efficiency levels of domestic solar water heating systems are divided into three levels, and the energy efficiency coefficients of each level should comply with the provisions of Tables 1 to 5.
Table 1 Energy efficiency ratings of compact domestic solar water heating systems
5 Technical Requirements
The energy efficiency limit values of domestic solar water heating systems shall comply with Level 3 in Tables 1 to 5.
6 Test and calculation methods
6.1 Test method
Daily heat gain per unit outline lighting area of domestic solar water heating system ( Q ) and average heat loss factor (IN sl) According to The test methods specified in GB/T19141 and GB/T18708 are used.
6.2 Calculation method
