Advanced Materials Research Vols. 732-733

Abstract: Evaporative cooling technology is a refrigeration technology by water evaporating endothermic, with zero-pollution, environmental-friendly, energy saving, and other advantages, which makes it widely used. Nevertheless, due to its working characteristic, the application of evaporative cooling technology is limited, particularly in some areas with high humidity. Using the liquid desiccant dehumidification and evaporative cooling technology leads to a solution, named liquid desiccant evaporative cooling air conditioning system extends the application of evaporative cooling technology. This article on liquid desiccant evaporative cooling system provides a brief overview about research status, full usage of the low grade thermal energy, the practical application and new development of the system.

Abstract: The Paper presented the structure and operation mode of ice cold-storage air conditioning unit, compared its operation cost with common chiller. At last, through the economic analysis, the paper indicated that the ice cold-storage unit has great promotion potential and prospect for development.

Abstract: To improve indoor air quality, mass transfer is an important part in air handling process, which is helpful for the control of humidity of air. This paper presents mass transfer dynamic analysis of isothermal and opposite flow process theoretically. The pressure difference analysis is used to show the changing of pressures of two phases in dehumidification process. It calculates the partial pressure of water vapor in wet air and the vapor pressure of LiCl solution. Also it gives the curves of pressure change in dehumidification of isothermal and opposite flow by lithium chloride. Results from this paper can be used as theoretical foundation for the experimental design of dehumidification of air by LiCl solution.

Abstract: This paper briefly introduced the cold air distribution system principle and characteristics. Apply the simulation software to simulate air distribution and thermal environment of cold air supply room. Adopt Effective Draft Temperature (EDT) and Air Diffusion Performance Index (ADPI) to evaluate indoor thermal comfort.

Abstract: By using numerical simulation method,the three-dimensional flow field of air supply cylinder using for displacement ventilation in industrial plant is analyzed. The internal structure, effective wind sent area and the shape of wind outlet small hole which affected the air outlet wind speed of air supply cylinder are researched. While compared with the simulated and measured result of the outlet velocity of the wind outlet small hole, the best feature parameters of wind speed in air supply cylinder has been gained. The result shows that: by changing the internal structure and decreasing the effective air supply area of the air supply cylinder, the wind speed from the air-outlet on the small hole can be more reasonably distributed; although by increasing the effective air supply area and changing the shape of outlet hole on air supply cylinder will make the air outlet be more effectively distributed, its value is unreasonable.

Abstract: In order to reduce energy consumption, solve the rural house of low energy consumption, integrated system is imperative under the situation of the new technology is applied to the villages and towns in energy conservation and emission reduction can therefore play a big role. This paper puts forward in the northeast area the heated kang facilities, the solar energy and methane integration, this paper introduces the integrated system design part, draw the system design, and the system's working principle and features a detailed explanation.

Abstract: A ground source heat pump system of combined office and residential buildings in hot summer and warm winter region is introduced. The system performance is studied through the experiment, and the performance of underground heat balance is analyzed by TRNSYS. The results show the superiority and applicability of the ground source heat pump system.

Abstract: The flow in a single-stage fan is analyzed through numerical simulation. The results indicate that there exists a best prewhirl angle which can make flow loss minimal at a given flow rate. So we can improve the internal flow field structure by changing the prewhirl angle, thus the fan efficiency can be raised. In addition, the flow separation on the suction surface is sensitive to the variation of the prewhirl angle. The range of the separation on suction surface increases with the decrease of the prewhirl angle, and expands to the central area of the blades.

Abstract: Taking the relative tip clearance as the variable, we numerically simulated the effect of tip clearance size on the performance of a straight-blade axial flow fan using the 3-D viscous flow solver. The tip clearance is referenced in the relative value. By comparing the flow field corresponding to five different values of the tip clearance 0, 0.5%, 1.0%, 1.5% and 2.0% with other parameters kept constant, we concluded that the changing of the tip clearance has a great influence on the performance of the axial flow fan. Both the efficiency and the total pressure decrease with the increase of the tip clearance.

Abstract: Cooling rate is an important evaluation index of pressure pre-cooling effect for fruits and vegetables. Experimental device of pressure pre-cooling for fruits and vegetables has been established. Pre-cooling process of golden pears has been tested. The key parameters which affected pressure pre-cooling 7/8 cooling time of golden pears such as different air flow rates, different shapes and sizes of vent hole and arrange form have been analyzed. The results show that it is better that cooling air flow rate is between 1.5 m/s and 2 m/s. Ellipse vent hole shape is the best vent hole style and key-groove vent hole is the worst. The cooling rate of stagger array form is faster than the parallel array form.