The Fuzzy Comprehensive Evaluation Of Central Heating System Optimization Control Scheme

After the implementation of household metering heating system, the self-regulatingbehavior of the thermal users makes central heating mixing water system with variableflow operation. Steady state control method does not adapt to the situation which underthe variable flow heating system and the main reason is that it is a delay in the heattransfer process. This requires that the system must be use suitable the control devicefor dynamic control.The purpose of this paper is to establish the heating system simulation model tostudy the variable flow heating system in operation, the primary network and thesecondary network flow and pressure dynamics, using reasonable regulation strategyand control program, to determine the optimal end pressure control programs, toachieve stable operation and energy requirements of the system.First, analysis major equipment simulation model of central heating system,especially due to the complexity of centralized heating networks, proposed thehydraulic conditions simulation and analysis method based on basic loop method,for thecomputer generation of the heating pipe network topology node incidence matrix andloop matrix in-depth analysis of research. Application of graph theory describes the pipenetwork topology, the introduction describes the heat source and the heat peak userinformation peak array, proposed the use of peak array automatically generate thepractical approach of basic incidence matrix array and the independent circuit matrix.The method can simplify pipe network calculate, shortening the entire pipe networkcalculation process time, reducing the preparation workload and difficulty of theoriginal data, to provide convenient for the dynamic simulation and regulation of theheating pipe network optimization. On this basis, prepared calculation program, by anumerical example to verify the correctness and practicality. And the establishment of acentral heating system simulation platform for the optimization of control programschooses to provide foundation.Then, for the troubled waters system of household metering heating pipe networkproposed to adapt the dynamic characteristics of regulation strategy and control programs, that is, for the actual heating system, raised a number group of differentialpressure control points and the differential pressure set point of terminal differentialpressure optimal control scheme, and the use of time series models for load forecasting,using the predicted load, determine the system’s water temperature, making the heattransport to the thermal station just in time to meet the current load demand. This canreduce the heat delay to the impact of heat regulation, further on-demand heating.Finally, for central heating pipe network variable flow system operatingcharacteristics，the fuzzy comprehensive evaluation method applied to the controlprogram optimization evaluation. Analyzed using fuzzy comprehensive evaluationmethod to evaluate the necessity of control scheme, the establishment of a centralizedheating system control program evaluation system. Establishment of a centralizedheating system dynamic simulation platform, application examples, in-depth evaluationof the end of the system differential pressure variable flow control scheme. Determinethe control program evaluation, adoption fuzzy comprehensive evaluation method toevaluate the control program, selecting the optimal pressure control program. Throughexamples verified the evaluation model is correct and practical, for the heating systemenergy-saving operation provides a theoretical basis and methods.Central heating system with variable flow the optimize control of running late start,the lack of real and reliable raw data as well as standardized information base pipenetwork, fuzzy comprehensive evaluation method just to make up for this deficiency, itis not only capable of system evaluation subjective and the objective of unity, but also toquantify some of the unavoidable fuzzy concept.