The Optimal Design And Study On Hot Water Pipe Network In Buildings

The hot water pipe network is the major constituent of the water and waste-water treatment engineering. Research on optimal design of hot water pipe network was conducted with the principles and methods of systematic engineering .That is to seek one design scheme of the pipe network with the least expenditure while the system meets the demands on the pressure of hot water .discharge and temperature. This study is significant for reducing the investment and operating cost of the network projects. Main research results are shown as follows:1. Linear programming model and non-linear programming model of the optimal design on acylic hot water pipe network was established taking the least pipe network investment as objective function. Simplex method and Genetic Algorithm method were adopted to solve the models respectively.2. Aimed at the characteristics of the optimal aviates in the design mathematic model of the annulating hot water pipe network, combined Genetic Algorithm method was provided for the solution of the models. While numbering the individual parameters, integer was adopted to stand for standard diameter of the pipe, real number was adopted to stand for discharge and total head.3. The relation between water power, heat and economy was analyzed .And the mathematic models of the optimal design of the timely-supply and all-day pipe of annulating hot water pipe network were established, combined Genetic Algorithm method was adopted to solve the models.4. According to the characteristic of the vertical pipe of the recycle hot water pipe network , hydraulic calculating theory of the network was introduced to distribute the circulating discharge in the annular pipe portion, and diameter of the pipe and general circulating discharge were adjusted . Based on the relation between the variation of the pipe and circulating discharge ,a new method to calculate the node temperature was introduced ;Taking the least investment of the pipe network as objective function, optimal design mathematic model solved by combined Genetic Algorithm method was established .According to the said optimal design mathematic model corresponding calculating program was compiled.