Advanced Materials Research Vols. 805-806

Abstract: Energy storage technology is a vital part of smart grid, and it can be utilized for grid-connection of renewable energy generation. In this paper, several kinds of energy storage technologies are introduced. Comparison of advantages and disadvantages of each technology is made, and the trend and development potentiality in China have been elaborated.

Abstract: In the Ground Source Heat Pump system, the vertical U-tube is the most common ground heat exchanger. The heat transfer between the U-tube and the soil is affected by many factors. For analyzing the influence of these factors on heat transfer of the U-tube, I use GAMBIT software to establish a physical model who is used to simulated the heat exchanging of single U-tube heat exchanger and the surrounding soil physical. and mesh it. On the base, we take advantage of FLUENT software to make numerical simulation. After finishing analysis, we got some conclusions as follows: Under different tube wells depths and different inlet water temperature conditions, with the pipe inlet velocity increases, the heat exchanger performance improves, but the temperature difference between the import and the export will decreases. In addition to improve the inlet temperature of the U-tube, we can significantly increase the transferring heat of the ground heat exchanger.

Abstract: In chilliness area, the temperature drop of oil in buried pipeline is affected by soil temperature field, and the thermal diffusivity is one of the main of physical property the soil, which affects the temperature drop of oil directly. This paper introduced the test principle of the thermal diffusivity of soil, and researched the influence of thermal diffusivity of soil on the soil physical property, such as soil natural temperature field, soil frozen days, depth of freezing and temperature delay, which can offer theory support for the calculation of hot oil temperature drop in buried pipeline.

Abstract: In this paper, the working principle, relevant equipments and characteristics of temperature and humidity independent control (THIC) air-conditioning system were presented. And authors summarized the application status, design conditions and application conditions of THIC air-conditioning system. Through the research of the system application at home and abroad, authors pointed out the engineering limitations and the way to improve and popularize the technology application.

Abstract: The coach body of the high-speed railway train is required to have a good thermal insulation performance. It can keep a comfort passenger environment and decrease demand for the cooling load of air-conditioning system. The determination of coach body heat transfer coefficient (K-value) is critical for the efficient design of vehicle air-conditioning system. A heat transfer coefficient calculation model is especially proposed for the typical aluminum section thermal insulating wall structure of high-speed trains coach body in china, on the basis of the fin heat transfer mechanism. For the train type of CRH3G, the calculating coach body heat transfer coefficient is in good agreement with the experimental value. So the proposed calculation method can significantly improve the computational efficiency of the K-value for the high-speed railway trains which have the typical aluminum section insulation wall structures, and provide a trustable basis for the coach body structure optimization design.

Abstract: In this paper, the effect on the thermal efficiency enhancement of a heat pipe using SiO₂-water nanofluid on different operating states was investigated. SiO₂-water nanofluids with mass concentrations of 0.1% ~ 2.0% have been prepared with the average size of 10nm, 30nm, 50nm, 70nm, respectively. Heat transfer characteristics of the heat pipe including wall temperature distribution, heat transfer coefficient and thermal resistance have been investigated, which showed excellent properties.

Abstract: Groundwater-source heat pump is a new kind of energy conservation and environmental protection air conditioning technology, which is playing a significant role in the development and utilization of the shallow geothermal energy.This paper takes Fuzhou basin as the research object, analyses its regional hydrogeological characteristics, finding Min River terrace and plains are the suitable areas to carry out the tests. On the basis of pumping and recharging experiments, the paper works out the recharging ability, the suitable pumping and recharging wells quantitative proportion of Fuzhou basin main aquifers and the well spacing design parameters between pumping and recharging wells, which provides some scientific evidences for the development of shallow geothermal energy and for the rational application of groundwater-source heat pump technology.

Abstract: Promote VOCs (volatile organic chemicals) and re-use recovered oil as secondary energy can reduce environmental pollution meantime bring lots of energy-saving and socioeconomic benefits. Related data shows that install VOCs recovery unit (VRU) can produce large quantity of energy-saving efficiency. However, China currently has no related energy-saving efficiency evaluation methods, which makes barriers for promoting VOCs technology. This paper lists the key elements that response for VRU energy-saving efficiency, provide computational formulas which focus on VRU recovery benefits, take a case study for example and calculation the energy-saving benefit that VRU can bring. From the data comparison analyzes the relationship between VRU recovery rate, emission limits and energy consumption. At very end of this paper, some suggestion for better setting emission standard also is given.

Abstract: In order to improve the scientificity and accuracy of ground source heat pump energy efficiency testing, the paper discusses the principles and methods of energy efficiency testing, the requirements of the testing instruments' selection and installation and the arrangement of measuring points.The paper shows how to diagnosis instruments and process system failure according to the concrete situation on site,and points out the methods of systematic troubleshooting and fault elimination.

Abstract: we analyzed the relationship between energy conservation and economic using panel data. the reduction of energy consumption per unit of GDP and energy consumption per unit of industrial value-added will promote economic growth, however, lower electricity consumption per unit of GDP may inhibit economic growth. Finally, this article puts forward corresponding suggestions, including improving the relevant laws and regulations, speeding up the energy saving information disclosure, improving public participation mechanisms, speeding up the adjustment of industrial structure and technological innovations, and promoting the reform of energy prices.