Energy Input of destratification for a stratified source reservoir: a case study of Jinpen Reservoir

• 1、Schoold of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology

Abstract：The theoretical energy required for destratification of a source water reservoir is important to determine the energy input of a mixing system and to estimate the energy efficiency of the system. A theoretical method of determining the energy input required for destratification of stratified source reservoirs. Taking Jinpen Reservoir in Xi'an as a study case, the water volumes under different water levels of the reservoir were numerically calculated using the geometry data obtained with a RTK system. The total potential energy (PE) was determined by integrating the PE in each thin sub-layer over the water depth with density dependent on the water temperature. The average water temperature after complete mixing was calculated based on the heat exchange theory. The difference of total potential energy before and after mixing was calculated for each month with the data of water temperature, water density and water volume. The minimum energy required for destratification increasing with the temperature gradient, was relatively high during the period from June to October, and reached a peak of 2432.08 kW?h in July. The actual energy input of a mixing system depends on the theoretical energy for destratification and the energy efficiency of the system. The calculation results implicated the best time of running a destratification system was the beginning of stratification when the energy required for destratification is low.

keywords： Stratified source reservoir, thermal structure, destratification, energy

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