Advanced Materials Research Vols. 805-806

Abstract: How to reduce the energy consumption on airport jobsite is the focus of this paper. We introduce this control technique and its specialist-aided system which can predict material temperature and save energy. After pouring concrete material, the technique can test and predict temperature change trend and concrete changing maturity level, based on key parameter information provided by contractors. Optimal curing method, thermal insulation and construction technology are developed giving the results of the preceding data. Contractors can find optimal solutions to save energy and resourced in airport winter construction using the technique, thus avoiding unnecessary energy consumption.

Abstract: Using Dest software simulation benchmark building the dynamic heat load, analyzing its distribution pattern, at the same timewe can also get heat pump units in the COP value is different under different working condition, then the soil source heat pump and central heating complementary heating system, undertake in soil source heat pump system design heat load, under theconditions of different proportion of the whole system operation energy consumption, initial investment analysis, we conclude thatthe soil source heat pump and central heating complementary heating systems of different energy matching optimization features,this provides a reference for practical engineering.

Abstract: According to kiln structure and material movement features, the transient heat conduction model of material bed and the contact heat transfer model at the interface of covered kiln wall and material bed are built. Considering their contribution to the convective heat transfer of material bed, the convective heat transfer coefficient between covered kiln wall and material bed is proposed, and its formula is obtained, with which the convective heat transfer between covered kiln wall and material bed can be calculated conveniently, so the heat transfer prediction within the rotary kiln can be done more easily.

Abstract: In this paper, a method based on the thermo-economics structure theories and the prospect diagnosis will apply in the 630MW power plants. To make use of thermodynamic simulation establish system of the thermo-economics produce model. The thermo-economic model and the exergy cost model for the plant based on the Fuel-Product concept have been defined to quantify the productive interaction between different devices. The paper analyses the 3VWO and 4VWO conditions and the effects of the operating parameters on the exergy cost of each component have been studied. The results showed that the Structure Theory is a powerful and effective tool, which can make up the insufficiencies of the conventional thermodynamic methods and can be used for the cost-effective operation analysis and optimization in thermal power plants and other complex energy system.

Abstract: Considering the influence of different-shaped pans on space utilization and heat distribution, two models are established to investigate a balanced solution. In order to handle the problem of heat distribution on the outer edge, the first model establishes differential equations of heat convection in unstable state and gets definite conditions. Then we discretize the area of pans and get numerical solution by finite difference method. Having analyzed the numerical solution, our model finally concludes that the temperature field of a regular polygon can be regarded as a series of circles centering at its circumcenter and the temperature increases with the increment of the radius. As for the second model, we first calculate the maximum value of pans N in the oven by the arrangements of aligned and staggered modes. Then we normalize N by min-max method. Next, based on the rule of temperature field in the first model, the uniformity of heat distribution can be measured by the area ratio of a regular polygon to its circumcircle. After that, we use the linear weighted method to transfer the problem of multi-objective optimization into a single-objective one and draw the conclusions below: In aligned arrangement, we select round pans when p<0.3, rectangular pans when and pans in regular octagons when . In staggered arrangement, we select round pans when the value of p is small and pans in regular hexagons when the value of p is large. Eventually, through sensitivity analysis , our model proves to be stable and applicable.

Abstract: The main failure modes of starter battery are discussed, the causes resulting in the premature failure of starter VRLA(valve-regulated lead-acid) battery are analyzed and corresponding countermeasures against failure of starter battery are presented. It proves to be of practical help.

Abstract: A process of using LNG cold energy for ice-making was proposed, the process consisted of three parts: LNG vaporization system, the refrigerant circulation system and ice-making system. And LNG cold energy was delivered to ice-maker by refrigerant. Through design and optimization, the optimum temperature was confirmed in the ice-making process, the benefit of power saving was calculated, and the efficiency of energy utilization was analyzed by exergy analysis method. The research results showed that the average ice quantity was 1.59t/h with vaporization amount of 1000kg/h LNG. Taking ethylene glycol aqueous solution as refrigerant, when its temperature changed from-15°C to-6°C, the energy efficiency was higher with 18°C temperature difference. And the benefit of electricity saving was 112 kW and the efficiency of cold exergy was 5.52%. The process can be designed into skid-mounted, which can flexibly operate between different LNG vaporization stations.

Abstract: In view of building a green campus is needed to the sustainable development of our country, this paper based on the energy consumption statistics and energy audit work of campus in Hubei province, and basically got the energy consumption status in Hubei province, the energy consumption indicators are between 28.3kgce / (student • a) and 269.6 kgce / (student • a), the average level is 95.0kgce / (student • a). The main factors affecting the energy consumption of campus were analyzed, including colleges of arts, science, engineering nature, the school's research capacity, and research funding and other factors. What’s more, we come to the conclusion that the relatively scientific evaluation indicators of the campus energy are indicators of annual energy consumption per student, the equivalent value correlations of which reach 0.81.

Abstract: This work introduced a kind of advanced adaptive control approach applied in Active magnetic bearing (AMB) to suppress the rotors vibrations in Flywheel Energy Storage System (FESS). The bearings system was built as a five degree-of-freedom (DOF) system and the four radial DOF among these were adopted AMB. Based on the Lyapunov theory, the proposed adaptive control law was designed to compensate various disturbance factors by controlling the AMBs. Finally, the simulation result illustrates that the proposed adaptive control law is effective to reduce the rotors vibration and improve the systems stability.

Abstract: As a novel generation of thermal separators, the Wave rotor refrigerator (WRR) has replaced the traditional pressure-wave thermal separator. However, the isentropic refrigeration efficiency still needs to be improved compared with expander. A novel WRR system cycle was built and the system performance was thermal analyzed under various parameters, such as expansion efficiency or compression efficiency of wave rotor. The results are used to compare with the traditional WRR system. It is shown that the advantage provided by this novel cycle over the traditional WRR is an expansion process and a compression process is integrated into one unit, with a higher energy transfer efficiency and simple structure. The isentropic refrigeration efficiency of this novel cycle can be more than twice of the traditional WRR under the pressure ratio of 1.1. The experimental works are carrying out.