|
Air-condition system is the chief part of building energy consumption. With the universal employment of Air-condition system, the building energy consumption is tremendous. It is easy to suffer from SBS when we frequently live in air-condition house. Ventilation heat transfer technology can not only improve house environment and eliminate SBS, but also reduce building energy consumption. The common energy saving and ventilation equipments, such as rotary heat exchanger, heat pipe, heat exchanger with thermal medium, plate fin heat exchanger etc. These are cross contamination, high cost,low efficiency,high running cost, difficult maintenance, severe operating condition,big and heavy in present market. In order to solve these problems, a new type fresh air heat exchanger should be developed and manufactured.At first, we design new type fresh air exchanger with cheap material of heat exchanging in air-condition circumstance, based upon family living environmental requirement and heat efficiency of 70 percent. Then fix the length and height of heat exchanger, change the thickness of heat exchange plate and space between plates, design other heat exchangers and calculate their efficiency.To research heat transfer performance and temperature distribution by mean of experimental and simulative methods, some temperature measure points are set in space between plates and research the temperature distribution. The relationship between the thickness, the space between plates, the difference in temperature, the air volume, the heat exchanging materials, and heat exchanging efficiency, the heat transfer quantity, and the coefficient of heat transfer. Finally, the experience and simulation are compared with design results.It is shown that the isotherm of space between plates is almost parallel to diagonal. With increasing the thickness of plate, the efficiency and quantity of heat decrease. When the space between plates is bigger than 2mm and the air volume is fixed, with the space increasing, the efficiency and heat transfer quantity decreases, and the coefficient of heat transfer increases. When the space is bigger than 2mm, the efficiency isn’t ideal. With the increasing of the air volume, the efficiency only gets a little increment, but heat transfer quantity increases. With arithmetic of difference in inlet and outlet temperature increasing, efficiency gets a small change. With the difference in inlet temperature increasing, the heat transfer quantity is significant larger, but influence on coefficient of heat transfer isn’t obvious. According to experience and simulation results, efficiency of experiment, simulation, and design results are close.Experience foundation is supplied by the research of heat transfer performance for heat exchanger further optimization. The new type fresh air heat exchanger is cheaper, more light, simpler construction and easier maintenance than traditional metal heat exchanger for adoption nonmetal heat transfer materials. Measuring temperature in plate space come true, and we get the temperature distribution. The market will be more widened by exploring and developing new material which can reclaim latent and enhancement heat transfer.
|