Experimental Study On Heat Transfer Enhancement And Self-Clean Of Vertical Natural Cycle Evaporator

Energy is the guarantee of economic development, but energy is non-renewable. Chemical industry in China always labels high energy consumption because of every unit GDP accompany with very high energy input. So increasing energy efficiency is signality to chemical industry of China.Evaporator is one kind of heat exchangers wildly used in industry. It gets its name because phase transition occurs in the heat transfer process. Traditional heat exchanger has a problem with dirt and its heat transfer efficiency is always low. So increasing the efficiency of heat exchanger is the key of increasing energy efficiency.The paper describes a new type of heat transfer enhancement and self-clean device and analyses its effect on theory aspect and takes a series of experiments based on the theory. A visible experiment has been carried out to investigate its self-clean effect; the result shows that it performs excellent in self cleaning. Then a series of heat transfer enhancement and friction loss experiments on different geometry dimension have been carried out to analyse its performance in heat transfer enhancement. The result shows that the device performs well in heat transfer enhancement. The trend of its performance with the change in geometry dimension was found by comparing the results of different geometry dimension. Then a vertical natural cycle evaporator experimental system for analysing the performance of the heat transfer enhancement and self-clean device in evaporator was designed based on a vertical natural cycle evaporator used in industry. In order to analysis the disturb effect of the device, a simulation of the device working in tube has been undertaken by using CFD software.