Theoretical And Experimental Research On Ice Slurry Making Method Using Double Direct Contact Heat Transfer

Due to its good thermal physical properties and fluidity, ice slurry shows a promising prospect on ice thermal storage air conditioning systems. However, how to obtain ice slurry efficiently and steadily is the key problem which restricts the development and application of ice slurry thermal storage systems. In this paper, various ice slurry making methods both at home and abroad are reviewed first, and the direct contact heat transfer method are proposed as the main research object of this paper. However, since large consumption of refrigerant, difficulty in separation of refrigerant and water, as well as occurrence of ice blockage exist in traditional direct contact method, a double direct contact ice slurry making method using gas and water solution is presented.Then, two fields are concerned for the system:1. Theoretical analysis of the direct contact heat transfer process between air bubbles and water solution are obtained, the main factors of the volumetric heat transfer coefficient are summarized, and how these factors play their roles are experimentally researched. At last, the dimensionless relationship between the volumetric heat transfer coefficient and its effect factors is obtained which lay a theoretical basis for the design of ice slurry generator.2. Energy consumption is the key constraint of the development of the ice slurry making method using gas and water solution. Therefore, the double direct contact ice slurry making system using gas and water solution is setup, on which the preliminary energy consumption is experimental analyzed, and the distribution of cold energy is obtained. The results show that:in the current system,50% of the cold energy is used to offset the air heating energy of fan, thus causes a great energy waste. Based on the above, in the end of the paper, shortages in current system are summarized and analyzed, and the improve direction of the system is indicated.