Ship Refrigerated Containers Frequency Energy Saving

Maritime refrigerated containers are of great mobility. With the varieties of ambient air temperature, seawater temperature, the radiation intensity of the sun and the diversification of cargo, the apparent and latent heat load of refrigerated containers also change. Traditional refrigeration system of refrigerated containers often use the operation mode as the same rotate speed and we often design the refrigeration system in according to the biggest heat load. In fact, refrigeration system just sometimes works in the peak load. The conventional control way is on and off which has much energy loss. With the development of micro-electronics and electrodynamics, frequency conversion has been applied broadly. Changing compressor speed with transducer and EEV taking place of regular throttles can achieve the energy adjustment of refrigeration system and save much energy.Firstly, because the ambient temperature and heat load changes greatly, this article adopts a not steady method that calculates the heat load of refrigerated containers hourly. Through calculation, we think that the design of refrigeration unit in according to dynamic load can achieve good effects of saving energy. In the same time the result provide a foundation for the application of frequency control technology. Refrigeration capacity of refrigeration unit changes with dynamic heat load and make the work conditions of refrigeration unit changes with heat load, in this way we can save much energy.Secondly, this article builds the mathematical model of components of refrigerated containers' system and simulates the whole course of refrigerated system. It forecasts the distinct running conditions of refrigerated conditions. With METALB we establish the fuzzy controller for controlling the superheat of the evaporator and analyze the performance of the controller.Thirdly, this article establishes the hardware project of control system of refrigerated containers. It introduces characteristics, the frame of hardware and the design of software of the system. This system makes use of many temperature sensors for checking up inside and outside of containers, the performance of compressors and the work parameters of refrigeration system. We implement the intelligence control of refrigerated containers in according to the high efficiency and low consumption and the reliability of the system...