GB/T 34148-2017 in English

GB/T 34148—2017 Standard Background and Importance

GB/T 34148—2017 "Guidelines for Calculating Water Savings in Projects" is one of the important national standards in the field of water conservation, which aims to standardize and guide the calculation of water saving in water-saving technology transformation projects. This standard was proposed by the Ministry of Water Resources and the National Development and Reform Commission, and is managed by the National Technical Committee for Water Conservation Standardization, and has important industry guidance significance.

Term Definitions and Core Concepts

Water saved by projects: refers to the reduction in water withdrawal per unit of water users compared to projects that have not implemented water-saving measures under the condition of meeting the same demand.

Baseline period: a period of time before the implementation of water-saving measures, used to compare and determine water savings.

Statistical reporting period: A period of time after the implementation of water-saving measures, used to compare and determine the amount of water saved.

Calculation method analysis

Basic formula and model method

The basic calculation formula for project water saving is: ΔWs = Wa - Wr, where ΔWs is the project water saving, Wa is the calibration water withdrawal, and Wr is the water withdrawal during the statistical reporting period.

The model method establishes a "water withdrawal-influencing factor" model, uses the base period data and the statistical reporting period data to calculate the calibration water withdrawal, and finally calculates the water saving. This method is suitable for projects with complete statistical data.

Direct comparison method

The direct comparison method measures the project water saving by comparing the difference in water withdrawal when the water-saving measures are turned on and off. This method is suitable for projects where water-saving equipment can be shut down, and is recommended for use when conditions permit.

Comparative analysis of standard frameworks

The following is a comparative analysis of relevant domestic and foreign standards in water saving calculation:

Implementation suggestions and precautions

Implementation suggestions:

• Clearly define the project boundaries to ensure that all water-using units, equipment, and systems affected by water-saving measures are included in the calculation scope.
• Choose the appropriate method: For projects with complete statistical data, the model method is preferred; for projects where equipment can be shut down, the direct comparison method is preferred.
• Pay attention to data quality: Ensure the accuracy and completeness of data in the base period and statistical reporting period.

Notes:

• Avoid measuring time that is too short to avoid large deviations.
• When setting the calibration water intake adjustment value, fully confirm with the relevant parties and ensure their independence.
• Regularly review the calculation results to ensure the accuracy of water savings.