| Introduction to the preparation of the national standard for "gas heating water heater" - standard preparation background | ||||||||||||||||||||||||||||||||||||||||
Gas heating water heater (referred to as wall hanging furnace) is a wall-mounted domestic gas appliance that can be used for household heating and for providing household sanitary hot water. It originated in Europe. For nearly two or three decades, the fireplace was home in Europe. Widely used, the penetration rate is like that of China's gas water heaters, with an annual production and sales of more than 7 million units.     Wall-hung boilers in China's development is from the late 1990s until the beginning of. From the introduction to the present, it can be roughly summarized into three stages: the introduction of the whole machine, the digestion and absorption of technology, and the standardization of standards. In the first two stages, there is no corresponding product standard and market access mechanism in the domestic market , and the water heater standard GB6932 is implemented. With the rapid development of the domestic heating market, major foreign brands have entered the Chinese market, and domestic production companies are also increasing. The quality of the products sold in the market is mixed with pearls, and the products are even mixed with ordinary water heaters. The manufacturing costs of products vary greatly from company to company, and the quality gap is also large. However, the user lacks understanding of this and thinks that it can mainly meet the requirements of heating and hot water, and the price is the first choice. This has caused chaos in the market, frequent accidents, and adversely affecting the continued development of the entire industry. Standard specification process In the above context, proposed by the Ministry of Construction, Guangzhou Devotion Domestic Boilers Manufacturing companies editor CJ / T228-2006 "gas heating water heaters" industry standard, promulgated in March 2006, formally implemented August 1. Since then, China's wall-hung boiler industry has had its own product standards. The end of the product has no standard stage. Enter the standard specification phase. The CG/T228-2006 standard is based on the European standards EN483 and EN625 , and is the standard for gas appliances that is in line with EU standards. The main safety technical requirements are equivalent to European standards. If the standard is implemented, the technical level of the whole industry and the improvement of product quality can be regulated. However, since the standard is only an industry standard and is a voluntary implementation standard, rather than a national mandatory standard, some boiler manufacturers with relatively low technical levels continue to implement GB6932 (gas water heater standard). There is still a wall-mounted boiler manufactured by the water heater product standard, which poses a great safety hazard. Gas heating water heaters are high-risk energy-consuming products. In order to completely solve the standardization of technical standards, ensure the safety of users, promote energy conservation, and protect the environment, the National Standards Committee revised the fifth batch of standards revision plan in 2007 to issue a mandatory national standard development plan for gas heating and heating water heaters. Members of the original CJ/T228 standard preparation team, as well as some new boiler manufacturers, have also actively participated in the preparation of new national standards. Introduction to the preparation of national standards This standard was prepared in accordance with the requirements of the National Standardization Administration Committee's Plan [ 2007 ] No. 100 , “Notice on the Release of the 2007 Fifth Batch Revision of the National Standard Project Plan†(Plan No. 20076380-Q-333 ). This standard is edited by the Supervision and Inspection Center of Guangzhou Disen Household Boiler Manufacturing Co., Ltd., and the Ministry of Housing and Urban-Rural Development is under the jurisdiction of the municipal gas standard technology. Meroni sanitary ware (China) Co., Ltd., Yima Co., Ltd. (Beijing Representative Office) Haideng Thermal Energy Technology Co., Ltd. and other units participated in the preparation.  The main drafters are: Lou Ying, Wang Qi, Zhang Jinhuan, Ren Zhi, Yan Xiaoqin, Gao Xuejie, Li Wei, Qiu Guoli and others. Technical reference units in the standard preparation process give strong technical guidance. This standard items from the 20008 on January 15, Tianjin will start the Red House, the establishment of the preparation group. In March 2008, * completed the first draft. 2008 September 24 will convene an expert review and audit. Four seminars were held during the preparation of this standard . This standard is based on the CJ/t228-2006 "Gas Heating Water Heater" standard and has been enacted for more than one year. The members of the compilation team have further understanding of the EN483 and EN625 standards, which are based on the original CJ/T228 standard. And in October 2008 , the completion of the approval. End of December 2008 reported to the National Standards Committee for approval. This standard is expected to be enforced in the second half of 2009 . The difference with the European standard EN483, EN625, line standard CJ/T228 and GB6932 . A., Compared with the European standard EN483 EN625 This European standard EN483 standard modifications and EN625, having a combination of appliance suitable for heating, hot water dual-use, is also applicable to a special case of a single heating tool. The differences from EN483 and EN625 are as follows: 1.     According to the situation in China, the following contents in EN483 have been deleted : Appendix A: Product classification and gas supply conditions in the European Community countries. Appendix B: Special country conditions. Appendix E: Compilation of experimental conditions (mainly for European gas sources), this standard gas condition technical provisions refer to GB/T13611. Appendix K : Examples of indications (for different countries in the European Community). Appendix N : Requirements and experimental methods for C6 boiler feed and exhaust piping (test methods for separate flues separate from appliances, not available in China). Appendix Z : A comparison table of the main requirements of EN483 and the EU Directive. The content of the appliance's large heating working water pressure of 6kg (ie, pressure level 3 ) was deleted . 2. Compared with EN483 , the following has been added: 7.1.4 Accuracy requirements of test instrumentation. Precision test instrumentation based primarily on the technical requirements of EN483 in flue gas analyzers Article 7.1.9 requires the measurement uncertainty and technical report of the European Committee for Standardization in CR1404. 6.8 hot water system performance requirements. This part of the content is mainly based on EN 625 , the performance of the standard related to security is extracted, the excerpt terms are equivalent to EN 625.     Appendix E : Electrical Safety Performance. In order to make use of the standard, this part is mainly based on GB4706.1 , excerpted from the electrical safety requirements related to gas heating stoves, and the extracted terms are equivalent to GB4706.1. 9.2.2 Security warning content. This part of the content according to the requirements of GB/T20000.4 , by assessing the safety issues that may occur in the appliance, the user is prompted to use the risk.       Detection rules. Compared with other gas appliances, the heating furnace is a small batch of large appliances, with many inspection items and complicated methods. In this standard, no specific scheme is given for the factory inspection sampling plan, only the principle is given, and the specific scheme is determined by the manufacturer. The determination of inspection items and mandatory items is the degree of impact of the establishment team on safety, energy conservation and environmental protection, and the repeatability of inspections, and is determined through many discussions in the seminar. 2. Description of differences in technical terms Compared with EN483, EN625 , this standard modifies the following: Heat input deviation: EN483-5% , this standard -10% ; this is more suitable for China's national conditions, especially the impact of altitude. Windy test: This standard adopts the test method of the Japanese standard simplified from the European standard. Performance requirements for domestic hot water systems: Unlike EN 625 , this standard only extracts the safety provisions of EN 625 as performance requirements of this standard.  Heating water system zui large working pressure: EN483-6KG this standard -3kg.  Added and modified content compared to industry standard CJ/T228 .  The main difference between the new standard and the performance requirements of GB6932
The thermal efficiency requirements under Section 6.7.2 and the thermal efficiency test under Section 7.7.2 are added. The introduction of higher requirements for heating water heaters, especially for the structural design of water heaters, the matching design of fans and air pressure switches, and the insulation of the whole machine need to be greatly improved, otherwise it is difficult to meet the requirements.  Chapter 8 inspection rules have been added and mandatory provisions are listed in the standard.  Rewrote the electrical safety requirements of Appendix E. 2.     Compared with the water heater standard GB6932 difference     Since the heating water heater is unattended for continuous operation, the equipment for collecting water, gas and electricity is the primary condition for safety, environmental protection and energy conservation . The main differences between the new standards and the performance requirements of GB6932 are shown in the table. In addition, the new standard also requires safety warnings and safety assessments, emphasizing: All aspects of danger should be effectively eliminated. Protection against impossible dangers should be taken. The user should be informed of the residual hazard and indicate whether it is necessary to take measures to reduce the hazards that may arise during installation or use and to warn of possible hazards!     Safety instructions and the prohibition of the use of non-environmental materials such as asbestos are listed as mandatory.  The impact of the promulgation and implementation of new standards on the industry "Gas Heating Water Heater" is a standard for China's gas industry* which is in line with Europe and international standards. It is also * as an independent industry. It is different from the boiler wall form inspection standard and is applicable to product conformity assessment, market access and market. The standard for supervision and inspection. Therefore it will play the following role in the market: 1.     Increased market access technology threshold For those companies with poor production technology and low detection levels, they will be eliminated. At the same time, it is possible for the powerful enterprises to increase capital investment, develop new products, and carry out advanced testing lines to effectively ensure the stability of product quality. This will help improve the overall technical level of the entire heating water heater industry. 2.     Instruct manufacturers to provide production design levels Manufacturers are required to design products that meet the basic requirements for safety, environmental protection and energy conservation as proposed by the standards: Safety requirements: from design and production. The fourth aspect of after-sales service and safety assessment reduces the unsafe factors in the use of the product to a low level, ensuring the safety of users. Energy requirements: the new standard thermal efficiency of the product zui lower requirements than GB6932 7% higher energy efficiency standards, admitted 3% higher than the state, in view of the long working time at part load heating boiler, in this new standard was added 3% Efficiency parameters under load. The heating stove works continuously 24 hours a day during the heating season , and the significance of energy saving is even more significant. Environmental protection requirements: Under any external conditions, including flue blockage, power fluctuations, typhoon and other unfavorable factors, the CO content of flue gas emissions during product operation cannot exceed the specified value, also because of continuous operation, smoke emissions to the community air The quality impact cannot be ignored. 3.     Standardize the market and guide the healthy and sustainable development of the industry Because the new standard requires far more safety and reliability, energy saving and environmental protection than GB6932 , when direct consumers and indirect consumers understand the contents of the standard, they will give priority to reliable quality, good safety performance and environmental protection. Energy-saving products will also stimulate manufacturers to design and produce better quality products, thus forming a virtuous circle.  Article from: Guangzhou Disen Household Boiler Manufacturing Co., Ltd. |
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