ABSTRACT
The ice storage air-conditioning system has won the power production department
and air conditioning users’ favor with its advantage of reducing the peak power
requirement. Now the system has been getting more and more attention and being
widely used at home and abroad. The current points of research are concentrated in the
dynamic characteristics of ice storage tank, the optimization allocation and the
economical analysis of the system, and so on. Because of high storage density, high
efficiency in space utilization, simple equipment, small system resistance and long
service life, the storage system filled with ice balls is widely used. Based on storage
tank filled with ice balls as the core components of the storage air-conditioning system,
the author mainly engaged in the following research work:
(1) Design and build the ice storage air-conditioning system test plant. In order to
study the ice ball type storage system characteristics, the author as a designer, consulted
a lot of summarizing literature and original about design of ice storage system, then on
the basis of predecessors' experience, combined with the characteristics of the building
in designing the test plant. The designed ice-storage system made the chiller and storage
tank in series and the chiller located in the upper reaches with the implementation of
component cold storage strategy. There are comparison in calculation and selection of
the four fundamental refrigeration parts under the charging process and air conditioning
condition.
(2) Established and solved the mathematical model of the charging process. When
establishing the mathematical model of the cold storage process, the author took
structural characteristics of the storage tank and the subcooling of the ice ball in cold
storage process into consideration. In view that the influence of water-ice interface
includes heat conductivity and convective, the author simplified the complex
phenomenon and established mathematical model of the charging process. The
influencing factors are analyzed such as storage tank's height, ice ball size, subcooling,
velocity and inlet temperature of secondary refrigerant, initial temperature of secondary
refrigerant and cold storage agent and so on.
(3) Experiment research. Take into consideration of main factors that affect the
charging process and discharging process of the storage tank and their roles of the law