Papers by Author: Bin Liu

Abstract: t is introduced about the characteristics, structure and application of refrigerator for vaccine transportation. From the test of thermophysical properties of cool storage material in cold closet using for vaccine transportation and the insulation performance of cold closet with different cool storage materials, it turned out that the thermophysical properties of the novel cool storage material is similar to the imported; the insulation performance of cold closet with the novel cool storage material is slightly less than the imported. Since this novel cool storage material can keep the temperature within 8°C for more than 80h, which totally satisfies the request of domestic vaccine transportation, it's worthy of promotion.

Abstract: The thermal properties of nano-fluids are affected by many factors. The effect of the diameter, mass fraction and volume fraction of Al2O3 in water on the thermal conductivity was measured by the method of hotwire. The diameter of nano-particle of Al2O3 was 10nm, 20nm, 50nm, 100nm and 500nm respectively. The mass fraction of Al2O3 in water was 10%, 12%, 15% and 20%. The results show that the diameter of the particle plays a critical role on thermal properties of the base fluid. And for the mass fraction, it will increase the thermal conductivity of the base fluid. When the size is more than 100nm, the coefficient of thermal conductivity is increased rapidly. Compared with the results calculated by the Maxwell model, the conductivity of the nanofulid with a diameter less than 10nm is consistent with the model’s result. And with the increasing of the diameter o f the nanoparticle, the deviation of the conductivity will also increase compared with the model’s results.

Abstract: The performance of the hybrid wall powered by solar energy was numerically simulated. The factor of H/W was discussed The performance parameters include the induced air mass of the outlet, the induced air velocity of the outlet and the temperature difference between the inlet and the outlet. The results show that ratio of H/W has an important effect on the performance of the hybrid wall powered by solar energy. The induced air mass of the outlet is decreased linearly with the ratio of H/W in a logarithmic coordinate. The temperature difference between the inlet and the outlet increases with the increasing of the ratio of H/W. But for the induced air velocity, it increases with the increasing of the ratio of H/W, and when the ratio is higher than 10, it decreases with the increasing of the ratio of H/W.

Abstract: The ice-temperature storage is one of the most important methods in the preservation of fresh fruits and vegetables, while the theory about ice-temperature storage is still not mature at present. In order to study the effect of the pre-thermal processes and the post-thermal processes on the ice-temperature storage, some experiments were carried out. The experimental conditions included two different cooling rates (5°C/day and 3.5°C /day) and two different heating rates (3.2°C /day and 5.1°C/day). After the cooling, the cooled Kiwi and Pear had been stored in the ice-temperature storage for one month. During the storing time, the total sugar, the acidity and the soluble solid were measured by the national standards each two weeks. The present obtained results show that a lower cooling rate would be beneficial for sustaining hydrocarbons and increasing the acidity in fruits after ice-temperature storage; while a quicker cooling rate would increase the soluble solid in fruits after ice-temperature storage.