Mathematical modeling and optimal operation condition analysis of heat pump two-effect direct contact membrane distillation system

Abstract

Compared with traditional membrane distillation system, the heat pump two-effect direct contact membrane distillation system has an advantage of low energy consumption. However, affected by many kinds of parameters, such as materials, components and operation conditions as well as the complex coupling between these parameters, it is difficult to achieve the optimal operation conditions and high gained output ratio (GOR) by optimizing the parameters. Therefore, analyses of mathematical modeling and optimal operation conditions of heat pump two-effect direct contact membrane distillation system were carried out in this paper. According to the operating principle and physical characteristics of key components, such as membrane distillation system, heat pump system, intermediate heat exchanger and auxiliary cooler, the mathematical model of heat pump two-effect direct contact membrane distillation system was established, the process of system performance simulation was designed and system performance simulation software was compiled to analyze the effect of ten parameters on GOR and total water production(Wtot). The optimal operation conditions analysis method of heat pump two-effect direct contact membrane distillation system was proposed. Through the developed simulation software of the heat pump membrane distillation system, using the proposed optimal operation conditions analysis method, When Wtot was 10.0kg/h and heat pump compressor power was 688W, the GOR of the optimized system could reach 9.43