Analysis And Optimization Of Heating Scheme Based On The Life Cycle Cost Evaluation Method In An Residential District Of Chongqing

At present, the theme of south heating has changed from “southern region whether heating or not” into “ southern region should choose what kind of heating way”, many scholars have studied several optional heating way of the cities such as changsha, Shanghai, chengdu and others in Yangtze river basin, but the study on the heating of chongqing is relatively weak and has not formed a system. This paper aimed at analysis of suitablly residential heating way in Chongqing based on hilly terrain, more energy structure and a residential distract.Chongqing has not central heating history, the residents are casual for heating way and heating time, then,heating mode have bigger influence on the heating system. In this paper, according to the habits of chongqing residents heating, the heating mode is divided into continuous operation mode and intermttent operation mode and the use rate of heating system is divided into four phases including 20%, 50%, 80%, 100%, and analyzed the applicability of different heating scheme in chongqing area on the premise of operation mode and utilization.First of all, use the Dest-h energy consumption simulation software to simulate the dynamic load in residential district according to the climate characteristics of chongqing region and partition load according to the control demand. Assume that gas, soil and water conditions on residential area surrounding satisfy the heating requirements, analyzed suitable for district heating schemes from three aspects including household heating, building centralized heating,regional centralized heating.Second, Analyze the heating scheme and calculat the annual operation cost of various heating schemes under different usage according to the initial investment of different heating schemes and different heating operation mode and strategy, and obtained the results that the household heating by the wall-mounted gas furnace, the building centralized heating by air cooled heat pump, the household heating by water source heat pump are optimal solutions when utilization rate is less than 20%, the regional centralized heating by ground source heat pump and water source heat pump, the building centralized heating by gas-fired hot water boiler are optimal solutions when Utilization rate is higher than 20%.Count to the life cycle costs of different heating scheme under different useful life including full life cycle, 10 payback years, 5 payback years that considering the economic influence for heating schemes about useful life, thus obtained the results that lasts for 20 years, the household heating schemes are preferred solutions below 20% utilization, the regional centralized heating scheme above 20% utilization;,and lasts for 10 years, the household heating schemes are preferred solutions below 50% utilization, the regional central heating scheme are preferred solutions above 50% utilization, and lasts for 5 years, the household heating schemes are preferred solutions below 80% utilization, the household heating schemes or the regional centralized heating scheme are preferred solutions above 80% utilization.Finally, optimize the heating scheme and increase the residential cool supply in summer considering the high temperature of summer in chongqing, meanwhile, devide the cooling time and count initial investment of optimization scheme. Calculat the annual operation cost and annual operating costs per unit area of each scheme, and obtained therult that the household combined cooling-heating by the wall-mounted gas furnace, the building centralized combined cooling-heating by air cooled heat pump, the household combined cooling-heating by water source heat pump are optimal solutions when utilization rate is less than 20%, the regional centralized combined cooling-heating by ground source heat pump and water source heat pump, the building centralized combined cooling-heating by gas-fired hot water boiler are optimal solutions when Utilization rate is higher than 20%.Count the life cycle costs of different cooling-heating combined scheme under different useful life including full life cycle, 10 payback years, 5 payback years, and obtained the result that lasts for 20 years and 10 years, the household combined coolingheating schemes are preferred solutions below 50% utilization, the regional centralized combined cooling-heating by ground source heat pump and water source heat pump are preferred solutions above 50% utilization, and lasts for 5 years, the household heating schemes are preferred solutions below 50% utilization, the household combined coolingheating schemes and the regional centralized combined cooling-heating by water source heat pump are preferred solutions above 50% utilization.