Numerical Simulation Of Heat-source Tower With Open Structure

Energy-saving and comprehensive utilization of resources is a long-term strategic policy of our country's economic and social development. Concerned the air-conditioning system, to seek low-cost low-grade renewable cold and heat source is a key measure of energy-saving. Therefore, the search for saving and environmental cold and heat source is a very important issue.Heat-source tower is a relatively new type heat and mass transfer equipment, which could collect cold or heat source from air on demand, via the heat and mass exchange of working fluids and air, providing low-grade renewable cold and heat source for heat pumps. This equipment makes full use of renewable sources, achieving energy-saving.Due to the short-time in practice, heat-source tower still needs to be improved or optimized in respect to its structure and operating parameters, and the leading product has not yet formed. Also there is hardly theoretical research of the heat and mass transfer process in the tower. Therefore, the theoretical research of heat-source tower possesses important theoretical significance and practical value.In this paper, work and conclusions are as follows:1. Three typical heat-source towers with different structures are compared in aspects of working principle, application characteristics and performance, etc. It is found that the improved closed type has better performance in the operation, yet it has the most complex structure and relatively high cost. Although the open type has low cost, it has the relatively worst performance, while the common closed type is between the two above-mentioned. But each structure should notice the problem of the decline of working fluids concentration in winter.2. Theoretical analysis of the heat and mass transfer process in open-type heat-source tower is carried out in this paper, and the change process of air and solution state in the tower is visually described on h-d chart, respectively in winter and summer. And the heat exchange efficiency formula is put forward to further understand the degree of heat and mass transfer in tower.3. The impact factors of open-type heat-source tower's performance are analyzed and several improved measures of its performance are put forward in this paper.4. Application of FLUENT and MATLAB respectively, numerical simulation of the heat and mass transfer process in open-type heat-source tower is carried out. Distribution charts of various parameters in summer and winter is obtained, also the relevant analysis is carried out followed.More in-depth theoretical research of the heat and mass transfer process in open-type heat-source tower is carried out in this paper, hoping to provide theoretical guidance in the equipment's R & D and engineering application, and also hope to provide reference for its further research.