Advanced Materials Research Vols. 694-697

Abstract: The evaporation-air-cooled (methanol) heat exchanger the actual condition, in the same conditions, five different heat exchanger tube simulated temperatures and stress field. The results show the elliptical tube and corrugated tube heat exchangers are best, built-spring pipe is better. Elliptical tube's stress is the maximum, corrugated pipe has stress concentration. Application enhanced heat transfer technology, a relatively compact structure can be used to transfer the required heat, using enhanced tubes instead of smooth tube is an effective method.Considering the safety, cost, and heat transfer efficiency and other factors, the final evaporation-air-cooled (methanol) built-spring heat exchange tube is more reasonable choice.

Abstract: The solar adsorption water tube was put forward in this research paper, which producing water from atmosphere with solar energy. When the ambient temperature range is 30.7°C-41.6 °C and the solar transient radiation range is 284 W/m²-1007 W/m², a solar adsorption water tube could produce 78ml water after adsorbed 10m³ air. The highest temperature of the adsorption bed can reach to 200°Cin the process of desorption.

Abstract: Using the software - ANSYS to analyze the temperature field of the thermal vibration screen after the on-site measurement of the thermal vibration screen's temperature field,the paper have found the highest temperature spot of the side panel and the beams ,which provide the important references for further study on the thermal vibration screen's heat stress and the prediction of working life.

Abstract: The good and bad effects of cryogenic equipments and pipe cold directly affect the energy consumption of the device as well as light hydrocarbon production. Therefore, the low temperature pipeline laying cold layer is necessary to analyze the cold material impact on the structure of the heat transfer of cryogenic piping cold, it can be able to provide a scientific basis for the future related to the transformation of low-temperature device and pipes. Through the establishment of the low-temperature piping cold heat transfer model, analyzing the impact of different pipeline medium temperature, cold material under low temperature piping cold heat transfer. The results show that : (1) Under the conditions of the same cold thickness ,the temperature of the medium in the pipe decreases , the heat flux becomes large , the cold loss becomes larger ; ( 2 ) Same medium temperature and the thickness of the cold , the cold effect of the insulation material order LT> polyurethane> foam glass .

Abstract: With its rapid temperature response and high thermal efficiency, near-Infrared (NIR) heating technology is widely used in modern industry, especially in heating furnace. In order to investigate influence of structure and material properties on the heating performance of a vacuum NIR hot-pressing furnace, a series of numerical simulations are utilized. On a variety of factors of power, insulating materials, shielding layers, an optimal proposal is revealed. As a result, the central temperature of the furnace can be up to over 600°C within 20 minutes and the temperature on the outside wall of furnace can be kept to a safe degree for operator, with only one shielding layer of Mo and a silica aerogel layer of 20mm thickness, a kind of excellent heat insulating material.

Abstract: The working environment of Solid Oxide Fuel Cells (SOFC) includes high temperature and speedy chemical reaction. The improved control structure and optimization method for the simplified temperature system of SOFC are proposed in this paper. It designs a real-time cascade PID controller for dynamic reactive temperatures of SOFC which vary significantly as the external disturbance or operating mode changes. Considering the efficiency of fuel utility and output power are incommensurable multiple goals, some fuzzy-based rules are introduced to solve these complex multi-objective optimization problems. The experiments’ result shows that the controllers have good robustness and quickness when the system is under the mode with external disturbances.

Abstract: This paper proposes an approach to calculate the specific thermodynamic energy and specific enthalpy of real gas. In the high-pressure air pneumatic system, the thermodynamic properties of the air which regarded as ideal gas would produce a large deviation to the actual value, thus seriously reducing the authenticity of the pneumatic parameters. In view of this, the specific residual thermodynamic energy and specific residual enthalpy of the high-pressure air were presented on the basis of modified corresponding state equation and virial equation which truncated to the third virial coefficient. In the specific enthalpy calculation for real gas, a difficult part of integration can be avoided by judiciously using advised residual functions. The true thermal physical property parameters of pneumatic system were obtained under the conditions of the wide variations of temperature and pressure.

Abstract: This paper carries on research for the temperature field distribution of the intelligent van tobacco baking room,first analyzes the temperature field model in the baking room on the basis of the principle of heat transfer, then makes the simulation computation with the analog software to obtain the temperature field distribution,after that,makes use of field baking experiment with the existing laboratory equipments to measure the temperature change curve in key points in baking room during baking process, and further analyzes the distribution trend of temperature field. The experiment result shows that the analog computation of temperature field distribution is in line with real situation,which can provide theoretical basis for the improvement of structure and technology of baking room .

Abstract: In research of diesel engine, fuel repeated injections are used often. In order to prolong heating in pressure process, heighten Pi and decrease Pmax ,Tmax. We make some expriments in diesel engine by means of one main injection + one later injection, the results show that indicated mean effective pressure is increased greatly, and NOX are decreased greatly ,in the case of no changing Pmax.

Abstract: High temperature medium in the thermal pipeline will affect distortion and stress distribution of the pipe wall, so its very important to analyze the thermal mechanical coupling in thermal pipeline. Numerical simulation of buried thermal pipeline damage under the earthquake action is carried by finite element method-ADINA. Three-dimensional finite element modeling considered site condition is investigated; geometry model is constructed with native and parasolid method in ADINA. Gravity and earthquake force are defined in structure model, and temperature load in thermal model. According to the results of thermal mechanical coupling, the damage of buried thermal pipeline is analyzed. Influence of single temperature load on the stress and strain of buried thermal pipeline is very small, but the stress and circumferential strain increase rapidly under earthquake action. Also, the axial strain is very complex. The temperature load mainly affects axial strain under gravity and earthquake load; the increasing temperature enables to reduce axial strain, which makes axial destruction reduced. Finally, some advice is proposed.