Study And Application On Evaluation Method Of Heat-supply System And Its Operation Optimization

In our country, the winter heating energy consumption of northern towns has reached58%of the total building energy consumption, it’s obvious that energy saving of heating system has become the key link to implement building energy-saving and emission-reduction work. According to statistics, in China, the comprehensive energy efficiency is just35%-55%, While heating energy consumption per unit area is20kgce annually, which is2-4times as much as that of developed countries in the same climatic region. Among them, extensive management and lack of gripper to improve is one factor that should not be neglected.The widely application of energy-saving equipments and process is the most effective way to reduce heating energy consumption, however, the selection of appropriate technology must be based on a good command of system operation condition and energy consumption shortcomings. Therefore, evaluating the operation of heat-supply system scientifically, to find out the weak links to guide the operation regulation and energy-saving reformation is the crux to realize heating energy-saving.In view of the problem that current evaluation indexes is varied, lack of comparability when horizontal benchmarking, and inaccuracy when vertical benchmarking, besides, subject to the conditions of measurement and monitoring in heating field, part of them are difficult to be acquired, lack of operability and practicality. Based on further research on energy efficiency evaluation indexes and methods of heat-supply and buildings, combining with the reality of heating industry, the specific evaluation indexes are determined. Integrated AHP and modified grey relational degree to distribute indexes’ weight, a practical, applicable, operational and comparable energy efficiency evaluation system using linear weighted comprehensive evaluation is proposed, in which ’security index’ is the premise,’technique index’ is the constraint and ’energy efficiency index’ is the emphasis. Aim to evaluate actual operation situation of heating system and its three key links, namely ’heat source’, ’heat supply network’ and ’heat user’. With the aid of energy efficiency benchmarking, its short board could be highlighted, then, backed by technique and craft, to improve energy efficiency of heating system and management level.Due to its own precision and features of heating industry, there exists a certain limitation when ’national standard method’ is adopted to determine the energy-saving quantity of heating system. In order to explore scientific methods to determinate the energy-saving quantity, on the basis of the analysis of energy consumption influence factors, depending on benchmark model, two models of energy-saving quantity for buildings’ heating system are put forward, respectively based on energy consumption of degree-days and energy consumption correction coefficients. Combined with practical energy consumption data of a university, the conclusion shows the validity and superiority of the proposed models, which finally provided solutions for the scientific evaluation of energy-saving effect and make an active attempt for the application of energy management contract in heating industry.Energy-saving concept of management in advance, supported by new technology, combined with long-term reward and punishment regulations, in the premise of improving heating quality, ensure that the benefit from each terminal must be reflected in fuel saving at heat source, aiming to realize closed loop optimization of energy efficiency in the whole process of heating.