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Features of Convective Heat-Exchange in Flat-Plate Solar Water-Heating Collectors
Applied Solar Energy Pub Date : 2020-03-16 , DOI: 10.3103/s0003701x19050062 Sh. I. Klychev , S. A. Bakhramov , V. V. Kharchenko , Kh. Nuriddinov , D. E. Kadyrgulov
中文翻译:
平板式太阳能热水收集器的对流换热特征
更新日期:2020-03-16
Applied Solar Energy Pub Date : 2020-03-16 , DOI: 10.3103/s0003701x19050062 Sh. I. Klychev , S. A. Bakhramov , V. V. Kharchenko , Kh. Nuriddinov , D. E. Kadyrgulov
Abstract—
Low-potential solar plants, including flat-plate water-heating collectors (FSWHC), are complex systems in terms of heat engineering. A problem in the development of both stationary and non-stationary heat engineering FSWHC models is to specify convective heat exchange in SWHC channels. This paper considers the features and conditions of convective heat transfer in SWHC channels to water. It is shown that the water flow hydrodynamic and thermal stabilization sections in FSWHCs and at potential speeds of their heat carriers reach only 10 to 13 cm in length and the convective heat exchange in SWHCs can be calculated at a constant value of Nu. It is found that the differences in temperature between the walls of a SWHC channel and between the wall and the liquid will not exceed 10 and 5°C, respectively. These conditions make mixed free and forced convection in SWHC channels possible. Since the heat mainly comes from the upper walls of the channel, this determines the need for pilot studies to determine the distribution of temperature on the walls and in the liquid along the channel length and the difference in temperature between them. The heat exchange in SWHC channels can be heavily affected by free convection. An important issue when elaborating design models of heat exchange in SWHCs is the possibility of applying the convective heat exchange formulas used for plates to the walls of SWHC channels.中文翻译:
平板式太阳能热水收集器的对流换热特征