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基于冷暖光照模型的矢量场稀疏纹理绘制
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作者 蔡勋 岳凯 徐华勋 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2010年第12期2083-2088,共6页
针对传统三维矢量场纹理映射方法中矢量场方向信息表现不明确的问题,在经典冷暖光照模型基础上,提出了基于冷暖源的渐变光照模型和基于噪声中心的冷暖光照模型.首先应用Halton序列和Gauss滤波生成稀疏噪声,然后引入冷暖源、距离因子等概... 针对传统三维矢量场纹理映射方法中矢量场方向信息表现不明确的问题,在经典冷暖光照模型基础上,提出了基于冷暖源的渐变光照模型和基于噪声中心的冷暖光照模型.首先应用Halton序列和Gauss滤波生成稀疏噪声,然后引入冷暖源、距离因子等概念,分别通过距离因子控制和基于纹理片元噪声变化的规律,实现了由纹理冷暖色温的变化来清晰地反映矢量场方向信息.实验结果表明,文中提出的2种光照模型均能够通过冷暖色温的变化清晰地从整体和局部两个方面反映出矢量场方向信息,有效地提高了可视化的表现效果. 展开更多
关键词 Halton序列 Gauss滤波 光照模型 冷暖源 距离因子
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Thermal comfort assessment and energy consumption analysis of ground-source heat pump system combined with radiant heating/cooling 被引量:1
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作者 路诗奎 张小松 《Journal of Southeast University(English Edition)》 EI CAS 2012年第1期52-57,共6页
A new ground source heat pump system combined with radiant heating/cooling is proposed, and the principles and the advantages of the system are analyzed. A demonstration of the system is applied to a rebuilt building... A new ground source heat pump system combined with radiant heating/cooling is proposed, and the principles and the advantages of the system are analyzed. A demonstration of the system is applied to a rebuilt building: Xijindu exhibition hall, which is located in Zhenjiang city in China. Numerical studies on the thermal comfort and energy consumption of the system are carded out by using TRNSYS software. The results indicate that the system with the radiant floor method or the radiant ceiling method shows good thermal comfort without mechanical ventilation in winter. However, the system with either of the methods should add mechanical ventilation to ensure good comfort in summer. At the same level of thermal comfort, it can also be found that the annual energy consumption of the radiant ceiling system is less than that of the radiant floor system. 展开更多
关键词 ground-source heat pump radiant heating/cooling thermal comfort energy consumption
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A Study on the Evaluation of Heating and Cooling Energy Efficiency in Residential Buildings for Climatic Zones of Turkey
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作者 Suzi Dilara Mangan Gul Koclar Oral 《Journal of Energy and Power Engineering》 2014年第12期2045-2052,共8页
In Turkey, most of the common type projects of mass production residential buildings are being developed and constructed by TOK1 (Housing Development Administration of Turkey). These buildings, in which energy effic... In Turkey, most of the common type projects of mass production residential buildings are being developed and constructed by TOK1 (Housing Development Administration of Turkey). These buildings, in which energy efficient approach has been disregarded for years, cause to gradually increase on heating and cooling energy consumptions. In regards to national economics, it is essential to evaluate energy efficiency and to develop suggestions to decrease energy consumptions in residential buildings. To achieve appropriate solutions, cost evaluation also becomes necessary. Therefore, this paper aims to introduce a study which serves the purpose of producing a choice of energy efficient solutions in order to reduce energy consumptions and energy cost. In this study, different heating and cooling energy efficient scenarios have been developed for a selected residential building, constructed by TOKI, for climatic zones of Turkey. For each scenario, energy simulations have been executed by means of the simulation program--DesignBuilder, the user-friendly visual interface of EnergyPlus, and cost analysis has been carried out by using the net present value and discounted payback period method. As a result, energy and cost effective solutions have been presented and discussed for different climatic zones. 展开更多
关键词 Building energy performance residential buildings energy efficient retrofitting energy cost.
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Heating and Cooling Hybrid System with Gas Mixture Sourced Heat Pump and Heating Boiler
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作者 S. Egnatosyan Z. Melikyan 《Journal of Energy and Power Engineering》 2011年第11期1021-1029,共9页
Preliminary investigation shows that air sourced type heat pumps by energy efficiency are competitive with gas boilers having 93% of coefficient of performance (COP) if heat pumps are used in climatic zones, having ... Preliminary investigation shows that air sourced type heat pumps by energy efficiency are competitive with gas boilers having 93% of coefficient of performance (COP) if heat pumps are used in climatic zones, having outside air temperature higher than (-3 ℃ to -5 ℃). But, in such conditions the heat pump's evaporator is covered by ice crust, which cuts off the flow of outside air-heat source through the evaporator of heat pump. For avoiding stating problems it is recommended to use as heat source a mixture of waste warm gases. In this article a high efficiency heating-cooling system is developed, consisting of warm gases mixture sourced heat pump, heating boiler operating simultaneously with heat pump and solar air heater. The heating demand of the served house is shared between boiler and heat pump. Instead of outside air the warm gases mixture enters into evaporator of heat pump. A new construction of heat exchanger was developed. The article presents the structure and principle of operation, as well as the method for optimization and design of suggested system. Analysis proved high energy efficiency and cost effectiveness of the new system. 展开更多
关键词 GAS MIXTURE heat pump BOILER hybrid system HEATING cooling.
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