Thermodynamic Analysis And Optimization Study On Central Heating Systems

The central heating system is a kind of mature heating way,because of the boiler with large capacity and high thermal efficiency,In building energy consumption,energy consumption of heating shares an important proportion.In order to save energy,it is important to carry out thermodynamic analysis and optimization study on central heating system.The main research contents and conclusions:1.The black box model of the boiler heat source for central heating system is established,energy analysis,exergy analysis and thermal economics analysis on central heating system and the three links are carried,the link which has energy saving potential and needs to optimize is obtained.2.According to different consumption modes,central heating system is divided to three kinds.Analysis and evaluation on different heating systems are carried.By introducing the concept of equivalent electric,the equivalent conversion coefficient is calculated.With a example,the energy conversion efficiency of the heating mode is obtained.Through theanalysis and evaluation,the best heating mode is obtained.3.The water temperature,return water temperature and temperature difference of central heating system are analysed,influence degree impact on the economy of heating system and each link are discussed.The reference for obtaining the best water temperature,return water temperature and temperature difference is provided.4.Pipe network of the central heating system is optimized.Through the analysis of the ratio of transport energy consumption and power,the control range of EHR is obtained;Through the analysis of specific frictional resistance,average value of economic specific frictional resistance and economic pipe diameter are obtained;Through the analysis of the hydraulic imbalance,the allowed range of hydraulic disorder fluctuation is obtained;Through the analysis of heating radius of optimization,the price of the maximumheating radius is obtained.5.Temperature field of mixer is simulated by using FLUENT software,in certain circumstances of the first network of water temperature and second net return water temperature,the characteristic curve of mixing ratio how to influent the second network of water temperature is obtained.