دانلود رایگان مقاله لاتین ویژگی حرارتی در ورق صفحه تابش سیستم گرمایش از سایت الزویر
عنوان فارسی مقاله:
بررسی ویژگی های حرارتی در چند ورق از نوع صفحه های تابشی سیستم گرمایش
عنوان انگلیسی مقاله:
Evaluation of thermal characteristics on a multi-sheet-type radiant panel heating system
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
To address the energy and environmental problems associated with global warming, increasing attention is being focused on the use of radiant heating systems combined with natural ventilation as energy-saving systems. Radiant heating systems such as floor, ceiling, wall, and panel heating systems are now regarded as energy efficient and comfortable heating systems compared with conventional heating systems [1–7]. The radiant heating system offers many advantages. It is more efficient than conventional airconditioning system, and it directly delivers heat from the hot panel surface to the people skins and in the room via infrared radiation. Further, it does not produce noise or cause drafts and does not use ducts. Moreover, the system provides uniform temperature distribution, which is suitable for improving personal convenience. Hydronic (liquid-based) radiant heating systems can use a wide variety of energy sources to heat the liquid, including standard gas-fired boilers, oil-fired boilers, solar water heaters, geothermal heat pumps, or a combination of these sources. Additionally, many energy-efficient building technologies with increased thermal insulation and airtightness have also been applied in buildings with radiant heating systems, which could contribute to low building heat loss and reduce energy consumption [8]. The computational fluid dynamic (CFD) technology has been extensively used to predict indoor heat transfer and thermal comfort environment in a radiant panel heating system. Myhren and Holmberg [9] and Chen [10] discussed different heating systems using CFD simulations (a surface-to-surface radiation model and a low-Re number k–ε turbulence model) to investigate draught problems, differences in vertical temperature gradients, air-speed levels, and energy consumption in their work areas. Karadag et al. [11] used the standard k–ε turbulence model to study ceiling-panel systems. They found that when the room dimensions and temperature difference between the ceiling and interior air increase, the Nusselt number over the floor also increases. Song and Kato [12] performed a simple analysis of an indoor thermal environment of a radiant panel system using CFD simulation. They demonstrated that a hybrid air-conditioning system with a radiant panel system could realize better energy efficiency than ordinary systems in a hot and humid climate. However, verification using full-blown experiments has not been performed. In addition, although the radiant panels used were the multi-sheet-type in which thin panels were lined up to moreeffectively exploit the dehumidifying effect of surface condensation, evaluation of the simulations was done using a simple model with a single sheet.
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کلمات کلیدی:
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