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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 39965-2021: General methods for energy savings pre -assessment Status: Valid
Basic dataStandard ID: GB/T 39965-2021 (GB/T39965-2021)Description (Translated English): General methods for energy savings pre -assessment Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: F01 Word Count Estimation: 10,114 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 39965-2021: General methods for energy savings pre -assessment---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.General methods for energy savings pre -assessment ICS 27.010 F01 National Standards of People's Republic of China Evaluation and calculation method before energy saving (ISO 50046.2019,Generalquantificationmethodsforpredictedenergy savings,NEQ) Released on 2021-03-09 2021-10-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee Evaluation and calculation method before energy saving 1 ScopeThis standard specifies the pre-assessment calculation methods, technical requirements and reports of energy conservation before the implementation of energy conservation measures. This standard is applicable to the country/city, energy user and project level before the implementation of energy-saving measures to evaluate the energy savings of energy-saving measures Calculation.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 13234 Calculation Method of Energy Conservation Unit Energy Consumption GB/T 28750 General Rules for Energy Saving Measurement and Verification Technology GB/T 32045 Implementation Guide for Energy Saving Measurement and Verification ISO 17742 Energy efficiency and energy saving calculations for countries, regions and cities (Energyefficiencyandsavingscalculation forcountries,regionsandcities)3 Terms and definitionsThe following terms and definitions defined in GB/T 13234 and GB/T 28750 apply to this document. 3.1 Energy conservation measures energyconservationmeasures Methods or actions adopted to improve energy efficiency, reduce energy consumption or improve energy use. Note. Rewrite GB/T 13234-2018, definition 3.3. 3.2 Pre-assessmentperiod Evaluate and calculate the corresponding time period before saving energy. 3.3 Energyconsumptioninpre-assessmentperiod During the previous evaluation period, evaluate the calculated energy consumption. 3.4 Conditioninpre-assessmentperiod Calculate the selected conditions for energy savings in the pre-assessment period.4 Calculation method4.1 Basic formula for energy saving 4.1.1 The basic formula (1) or basic formula (2) should be used when calculating the energy savings during the pre-assessment period. ESp=Eb-Ep (1) Where. ESp---Energy saving in the previous assessment period; Eb --- baseline energy consumption, see 4.1.2, 4.1.3 and 4.1.4 for the determination method; Ep --- Energy consumption during the previous evaluation period, see 4.1.3 and 4.1.4 for the determination method. ESp=Eb×εp (2) Where. εp---predicted energy saving rate, %, see 4.1.5 for the determination method. When the accuracy of the calculation result is required to be high, formula (1) should be used for calculation. Examples of calculation methods used in different situations See Appendix A. See Appendix B for an example of pre-assessment calculation of energy saving measures. 4.1.2 The following methods can be used to determine the baseline energy consumption. a) Taking the actual energy consumption of the existing energy measures before the implementation of the energy saving measures as the baseline energy consumption, which is usually applicable to the renovation project; Example 1.Plan to replace a new high-efficiency and energy-saving refrigerator, and determine the baseline energy consumption by measuring the energy consumption of the old refrigerator. b) Take the energy consumption that may be generated without implementing energy-saving measures as the baseline energy consumption, which is usually applicable to new projects; Example 2.To implement a promotion plan for energy-efficient refrigerators, you can measure the new refrigerators that a family originally planned to buy under the assumption that the promotion plan is not implemented Energy consumption. Example 3.It is planned to adopt energy-saving measures in a new building. When the relevant data before the implementation of the energy-saving measures cannot be obtained, the specific data of the new building (such as construction When building the amount of objects, the number of households, etc.), the baseline energy consumption can be calculated according to the minimum energy consumption requirements of this type of new building specified by the current building standards. c) Take the energy consumption of the relevant reference situation before the implementation of the energy-saving measures as the baseline energy consumption; Example 4.A region plans to replace a new high-efficiency and energy-saving refrigerator, and the benchmark energy consumption adopts the average energy consumption of existing refrigerators in the target region. d) Take the energy consumption of the relevant reference situation without implementing energy-saving measures as the baseline energy consumption. Example 5.To replace a new refrigerator with high efficiency and energy saving, the benchmark energy consumption adopts the minimum energy efficiency standard required by laws and regulations, or the average energy efficiency level in the market. 4.1.3 When formula (1) is used to calculate energy savings, both the baseline energy consumption and the energy consumption during the pre-assessment period can be determined by modeling methods. Can refer to Standards such as GB/T 28750 and GB/T 13234 analyze the relevant variables of baseline energy consumption and energy consumption in the pre-assessment period, based on statistical models or Physical relationship, establish the corresponding benchmark energy consumption and energy consumption model functions in the previous evaluation period. The established model should have good correlation. at this time, Formula (1) can be transformed into formula (3). ESp=f(x1,x2,,xi,,xn)-g(x1,x2,,xi,,xn) (3) Where. f() ---Model function of benchmark energy consumption, refer to 4.1.2 to use actual operating energy consumption data to construct build. When data related to actual operating energy consumption cannot be obtained, existing experience or related data can also be used. According to the establishment of a reasonable estimation model; g() ---The model function of energy consumption in the previous evaluation period, which can use the relevant data of the implemented comparable energy-saving measures, Empirical data or other relevant data, etc. for construction; x1,x2,,xi,,xn ---related variables affecting energy consumption, see 4.2 for the determination method. 4.1.4 When the data is incomplete and it is difficult to establish a relevant model, the benchmark energy consumption and the energy consumption in the previous evaluation period in formula (1) can also be empirical methods Estimate, or use a combination of modeling methods and empirical methods to calculate. 4.1.5 When formula (2) is used, the predicted energy saving rate should be based on relevant data, empirical data or other relevant data of comparable energy saving measures that have been implemented Make reasonable predictions according to the statistics. 4.2 Determine relevant variables to calculate energy savings 4.2.1 The data of related variables should be selected under representative normal operating conditions. It is not advisable to use unconventional operating conditions (such as Data related to energy consumption during the renovation. Otherwise, the operating conditions should be recorded in detail, and the rationality of the data should be analyzed. 4.2.2 When using formula (3) to calculate energy savings, according to the calculation purpose and data availability, the following methods can be used to determine the relevant variables data. a) Use data on variables related to the base period. At this time, the data of the relevant variables in the base period should be substituted into formula (3) to calculate the baseline energy consumption, the previous Energy consumption and energy savings during the evaluation period. b) Use the data of the relevant variables during the previous evaluation period. At this time, the data of the relevant variables in the previous evaluation period should be substituted into formula (3) to calculate the benchmark energy Energy consumption, energy consumption and energy savings in the pre-assessment period. The data of the relevant variables in the previous evaluation period can be Determination of parts (such as determining the output of the previous evaluation period according to the production operation plan of the previous evaluation period), or according to the change trend of related variables Simulation is determined. When the data of the relevant variables in the previous evaluation period cannot be determined by the above methods, the previous evaluation period can also be calculated through experience. The data of the relevant variables should be provided with a detailed description of the calculation. c) Use reference conditions to determine the data of the relevant variables. At this time, the data of related variables under the same reference condition should be substituted into formula (3) Calculate baseline energy consumption, energy consumption during the pre-assessment period, and energy savings. The data of relevant variables under reference conditions can be determined in accordance with laws, regulations, and standards. It can be determined according to the regulations of the fan, or according to the operating conditions of the implemented comparable energy-saving measures. 4.3 Calculation of energy saving for multiple energy saving measures 4.3.1 When calculating the energy savings of multiple energy-saving measures, first calculate the energy savings of each energy-saving measure separately, and then calculate the total energy savings. Energy, and the pre-assessment period conditions of various energy-saving measures should be consistent. 4.3.2 In order to avoid double calculation of energy saving, the energy saving measures should be analyzed in accordance with GB/T 13234 and other relevant standards, or the energy saving measures should be compared with other relevant standards. The possible interaction between other energy-using equipment, minus the amount of energy saved by double counting.5 Technical requirements5.1 Boundary Before calculation, the calculation boundary of energy saving should be clarified, and the boundary can be in accordance with GB/T 28750, GB/T 32045, GB/T 13234, ISO 17742, etc. Make sure. 5.2 Data source and quality 5.2.1 Data sources include but are not limited to. energy bills, energy audits, measurement and test data, relevant data on comparable energy-saving measures that have been implemented According to statistics, manufacturer data, national (or other) statistical data, indicators specified in standards, authoritative energy-saving measures parameters, industry-recognized production and Energy efficiency level, technical appraisal conclusions, expert opinions, survey data, scientific literature data, data agreed by related parties, etc. 5.2.2 The calculation purpose, available resource conditions, data reliability and data acquisition cost should be considered comprehensively, and appropriate data collection technology and data should be selected. Data sources to ensure the best data quality. If data is lost, the assumptions used should be recorded. 5.2.3 When calculating energy saving at the energy-consuming unit or project level, priority should be given to using data related to specific measures; calculating the country/city level For the energy saving of multiple energy-saving measures, relevant data such as statistical data or average data can be used. 5.2.4 Data quality can be analyzed with reference to GB/T 13234.The uncertainty can be analyzed with reference to GB/T 32045. 5.3 Determination of base period and pre-assessment period 5.3.1 The base period should be determined in accordance with GB/T 13234, GB/T 28750, etc. 5.3.2 The pre-assessment period shall be equal to or longer than the base period and shorter than the life cycle of energy-saving measures (unless otherwise specified). 5.3.3 When the current evaluation period is longer than the base period, full consideration shall be given to changes in operating conditions. Should be consistent with the length of the base period Based on the energy savings of the equivalent period, calculate the energy savings of the entire pre-assessment period. The relationship between the base period, equivalence period and pre-assessment period is shown in Figure 1. 5.4 Verification of results The calculation results should be verified from the following aspects. a) Conduct a comparative analysis with the existing conditions of comparable energy-saving measures to verify the technical characteristics, operating conditions, and boundaries used in the calculations And the reliability of the selected variables. If there is a difference, its rationality should be analyzed. b) Use calculation methods to evaluate the energy savings of existing comparable energy-saving measures, and combine the calculation results with the operating energy consumption records of the existing measures Conduct comparative analysis to analyze the calculation methods used and the reliability of the calculation results. If there is a difference, its rationality should be analyzed. c) Perform reliability verification with calculation results using other calculation methods.6 reportThe content of the pre-energy saving evaluation calculation report mainly includes. a) Overview; b) Description of energy-saving measures; c) Calculation purpose and accuracy requirements; d) Data source and quality; e) Selection of calculation boundary and calculation method; f) Determination of conditions and related variables for the base period and pre-assessment period; g) Determination of baseline energy consumption; h) Determination of energy consumption during the equivalent period (applicable to the period of the previous evaluation period being longer than the period of the base period); i) Determination of energy consumption during the pre-assessment period; j) Energy saving calculation; k) The total energy savings of multiple energy-saving measures (applicable to multiple energy-saving measures); l) Uncertainty analysis; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 39965-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 39965-2021_English as soon as possible, and keep you informed of the progress. 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