In view of the high temperature and humidity in the low-latitude island area, the long running time of the air conditioner throughout the year and the high transportation cost of conventional energy, it is difficult for the traditional high energy consumption air conditioning system to adapt. In this paper, a closed air conditioning system using deep sea water for cooling is proposed. According to the difference of heat transfer characteristics, the heat transfer pipeline is divided into two parts： vertical heat transfer pipeline and submarine heat transfer coil. The effects of pipe diameter and flow velocity on the heat transfer performance of vertical pipe and submarine heat transfer coil are studied by numerical simulation. The results show that the pipe diameter of the vertical section is less than 0.6 m and the flow velocity in the range of 1-2 m/s can ensure higher heat transfer performance, while for the submarine heat exchanger coil section, the optimum diameter is 0.025 to 0.05 m and the best flow velocity is 0.4-0.8 m/s. On this basis, the mathematical model of annual cost value suitable for the optimal design of vertical pipe section is established, the specific friction and flow velocity are calculated, and the hydraulic calculation table for design is formed. The design line diagram and its modified formula suitable for the engineering design of submarine heat exchanger coil section are given.
Key words
seawater /
cooling systems /
heat transfer performance /
optimization
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