共查询到19条相似文献,搜索用时 125 毫秒
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热管真空管集热器及太阳能热水系统 总被引:1,自引:0,他引:1
热管真空管集热器是继闷晒式、平板式、全玻璃真空管集热器后的第四代太阳能集热产品.在太阳能领域得到了广泛的应用。分析了热管真空管的原理、结构及传热特性;以国外产品为例,论述了热管真空管集热器的特点及工作性能;对直流式热管真空管热水系统和典型的间接式供热供暖及泳池热水系统进行了分析。 相似文献
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新型分离热管式太阳能热水器 总被引:1,自引:0,他引:1
一前言本文介绍的新型分离热管,原理明了、结构简单、加工容易,生产设备及工艺均与现有热管一样;本文所述的分离热管太阳能热水器,自动运行,无需消耗额外能源,适合在寒冷地区分体安装。 相似文献
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A novel loop heat pipe (LHP) solar water heating system for typical apartment buildings in Beijing was designed to enable effective collection of solar heat, distance transport, and efficient conversion of solar heat into hot water. Taking consideration of the heat balances occurring in various parts of the loop, such as the solar absorber, heat pipe loop, heat exchanger and storage tank, a computer model was developed to investigate the thermal performance of the system. With the specified system structure, the efficiency of the solar system was found to be a function of its operational characteristics - working temperature of the loop heat pipe, water flow rate across the heat exchanger, and external parameters, including ambient temperature, temperature of water across the exchanger and solar radiation. The relationship between the efficiency of the system and these parameters was established, analysed and discussed in detail. The study suggested that the loop heat pipe should be operated at around 72 °C and the water across the heat exchanger should be maintained at 5.1 l/min. Any variation in system structure, i.e., glazing cover and height difference between the absorber and heat exchanger, would lead to different system performance. The glazing covers could be made using either borosilicate or polycarbonate, but borosilicate is to be preferred as it performs better and achieves higher efficiency at higher temperature operation. The height difference between the absorber and heat exchanger in the design was 1.9 m which is an adequate distance causing no constraint to heat pipe heat transfer. These simulation results were validated with the primary testing results. 相似文献
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Non-concentrated evacuated tube heat pipe solar collectors have been reported to show higher fluid temperatures with improved thermal performance in the low to medium temperature range (?60 °C) due to low heat losses but suffer higher heat losses at the medium to higher temperature range (?80 °C) which reduces their efficiency compared to concentrated evacuated tube heat pipe solar collectors. To operate as stand-alone systems capable of attaining temperatures in the range of 70-120 °C, an innovative concentrator augmented solar collector can be an attractive option. The performance of a combined low-concentrator augmented solar collector in an array of evacuated tube heat pipe solar collectors defined as concentrator augmented evacuated tube heat pipe array (CAETHPA) and an array of evacuated tube heat pipe collectors (ETHPC) were tested and compared and results presented in this paper. The analysis of the experimental data allows concluding that the use of a CAETHPA is a more efficient alternative for integrating renewable energy into buildings with higher fluid temperature response, energy collection and lower heat loss coefficient compared to the use of evacuated tube heat pipe collector array (ETHPA). 相似文献
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J. COOMBS 《国际可持续能源杂志》2013,32(4):237-249
In this paper, various ways for improving the thermal performance of heat pipe solar water heaters were provided based on the heat transfer analysis and have been improved by experiments and practical use. It is shown that the increase of the heat transfer space of heat pipe condensation section is the effective way to improve the instantaneous efficiency of heat pipe solar water heater, and the increase of L/D ratio of heat pipe is also important for improving its whole day performance. 相似文献
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The Photovoltaic/thermal(PV/T) system combines the conventional PV panel with solar collector into one integrated system, which could achieve the function of generating power and providing thermal energy at the same time. Recently, it has become the most promising solar system for building applications. Most of the PV/T systems use water as the coolant, which could cause freezing problem in winter. To overcome this problem, the heat pipe PV/T system is developed to provide electrical and thermal energy stably without the seasonal barrier. Although some published review works have involved this type of PV/T system, they just stated a simple introduction on it, acting as a small part of their works. This paper focuses on the heat pipe PV/T system independently and provides a comprehensive and in-depth analysis of its performance. Firstly, the structure and operational principles of the heat pipe PV/T module and system are introduced concisely. Then the features and performance of different types of heat pipe PV/T systems, i.e., integral heat pipe, loop heat pipe, and pulsating heat pipe PV/T system, are presented and analyzed. This is followed by the review on the performance of the systems which combine heat pipe PV/T module and other devices. Finally, the research gaps in this field are identified, and some future research trends and directions are recommended. 相似文献
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Thermal management of solar cells using a nano‐coated heat pipe plate: an indoor experimental study
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With temperature increasing, the photovoltaic efficiency of solar cells is reduced significantly. Such an efficiency loss may offset the efficiency improvement because of the development of the photovoltaic technology. This paper provides a novel approach for efficiency loss recovery of solar cells. Specifically, a nano‐coated heat pipe plate was integrated with the solar panel to remove heat from the hotspots on solar cells. This study concerns the indoor experiments of a commercial solar cell thermally managed with a heat pipe plate. The temperature rise and non‐uniformity on the solar panel were quantified in different light irradiances. With thermal management by the heat pipe plate, the solar panel shows a temperature‐rise reduction of 47–50%. This implies that half of the efficiency loss of the solar cell can be recovered. In addition, the temperature variation within the solar panel is reduced to 1.0–2.5 °C, which is beneficial in prolonging the longevity of the solar cell. In the experiments, the heat pipe plate can provide a cooling flux of 380 W/m2 with light irradiance below 1000 W/m2. By incorporating the heat pipe plate with a water jacket, the heat removal flux could be improved to 600 W/m2, leading to a solar cell temperature of a few degrees higher than the ambient. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献