Study on long-distance water transfer channel with thermal insulation cover in winter
In northern China at high latitudes there are some long-distance water transfer channel projects which are mostly planed or built in the last century. Due to the economic conditions at that time, these channel projects were designed without considering for winter time and only transfer water under non-ice condition. However with the development of economy, it is urgent to transfer water in winter in order to al-leviate the shortage of water presently. But constrained by the structure form, the freezing resistance abili-ties of these channels are poor, which are not suitable for transferring water under ice cover. Instead install-ing thermal insulation covers for channels can prevent water from freezing. This method not only can solve the shortage of water in winter, but also can save the engineering transformation investment, which has great economic benefits and social benefits. In this paper the heat loss process of water in channels with thermal insulation covers is analyzed theoretically. Then a one-dimensional ice-hydraulics mathematical mod-el of channel with thermal insulation covers is established and the heat loss process of water is simulated. The influences of insulation cover thickness, flow rate and outflow temperature from water source on water transfer in winter are analyzed. Finally, on the basis of the above researches, the water transfer feasibility is demonstrated for channels with thermal insulation cover in winter and the safe schemes of water transfer are put forward. The study results have some reference value for water transfer safety and engineering trans-formation for channel project in winter.
ice engineeringthe heat loss processmathematical modelwater transfer channel projectthermal insulation cover
国家科技期刊平台
NSTL
万方数据
维普
