真空玻璃盖板热管平板式太阳能热水器的研制

介绍了研究成功的采用真空玻璃盖板的热管平板式太阳能热水器,测试了其性能,并与全玻璃真空管太阳能热水器和蜂窝热管太阳能热水器进行了比较。实测得到,真空玻璃盖板热管平板式热水器的日平均效率比后两分别大13．3％和6．5％,平均热损系数比后两分别小52．5％和21．5％。真空玻璃盖板平板式太阳能热水器性能优越,有很好的应用前景。     

太阳能热水器与热管热水器的联合应用

一般的淋浴池都是靠燃煤锅炉供热水洗澡,要消耗大量的煤。本文介绍的是利用太阳能和热管换热器回收采暖锅炉排烟余热来产生热水。“夏半年”利用太阳能集热器产生热水;“冬半年”利用热管换热器供热水,解决全年供热水的问题。该节能淋浴池能供500多人洗澡,从1983年建成已运行6年多了,现在还在使用。     

一种新型平板式太阳能集热器

本产品是采用新型合金材料和特殊结构制造的平板式太阳能集热器。它既可安装成建筑物瓦面和幕墙,也可用于热水工程和家用太阳能热水器,实现了建筑瓦面与散户安装的统一和兼容。     

插式热管—玻璃真空管太阳能热水器的研制

本文介绍了插式热管－玻璃真空管太阳能热水器研制思路及主要的结构特点,性能参数。对集热元件热管－玻璃真空管的设计做了一般性阐述。     

太阳能热水器

１太阳热水器的基本原理太阳热水器就是利用温室原理，把太阳能转变为热能，并向水传递热量，从而获得热水的一种装置。所谓温室原理就是指由于对流、辐射损失减少，使热量聚积，温度逐渐升高的一种自然现象。具体来说，太阳光透过玻璃进入密封的集热器内，大部分能量被集热器内的黑色吸收体吸收，然后将热量传给冷水，冷水加热后重量变轻，自动流入水箱上部，水箱下部的冷水由于密度大而自动流入吸热体继续获得热量，周而复始，水箱内的全部冷水将被加热。太阳热水器通常由集热器、蓄热水箱、循环连接管道、支架及其辅助零部件组成。若是集…     

内波纹管太阳能热水器的实验研究

给出了内波纹管的技术参数和结构。对以内波纹管做集热器芯体的太阳能热水器进行了测试,给出了测试结果,表明平均日效率提高了６．６％。     

新型分离热管式太阳能热水器

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。     

防倒流循环家用太阳能热水器的实验研究

以普通平板型自然循环家用太阳能热水器做对比,对作者设计的防倒流循环家用太阳能热水器进行了实验研究,结果表明：与普通平板型自然循环家用太阳能热水器相比,防倒流循环家用太阳能热水器具有较低的热损系数,且平均日效率较高。     

锥形筒翼板型整体式太阳能热水器运行特性的对比实验研究

锥形筒翼板型整体式太阳能热水器主要是为改善整体式太阳能热水器的内部循环、抗压能力以及制造工艺而设计的一种新型结构的整体式太阳热水器。     

Numerical and experimental analysis of the flat plate solar water heater systems' thermal performance

In this paper, improving the thermal performance of flat plate solar water heater systems by inserting different tube configurations inside the riser pipes has been numerically and experimentally studied. This study is focused on increasing the moving of energy from riser pipes to the operating fluid within the riser pipes. To achieve that, the diameter of the riser pipes was increased along with the insertion of different tube configurations within them, namely, smooth, helical, and wavy tubes, keeping the same amount of the operating liquid. A comparison was performed to determine the best in terms of coefficient of heat transfer of the operating liquid, mass flow rate of the operating liquid, pressure drop, and water temperature in the storage tank, as a thermal performance indication of the system under study. The findings show the model consisting of a straight tube inside the riser pipe provides the best thermal performance. In terms of thermal performance, the straight model outperforms the conventional model by 12.3%. An experimental and numerical comparison between the optimum model (straight model) was conducted. The study proves that the average difference between numerical results and experimental findings is 7.2%.     

真空管式太阳热水器得热量的实验研究

对某型号真空管式太阳热水器进行多天的热性能测试,采用最小二乘法拟合出太阳热水系统能量方程系数,求出该型号太阳热水器的能量方程,同时进行误差和敏感性分析,指导试验设计.     

带内集管的分体式太阳能热水器及其实验研究

为了实现太阳能热水器和建筑的结合,设计了一种分体式全玻璃真空管太阳能热水器。它由集热器、室内储水箱、上升管和下降管组成,其集热器的每根真空管内有一个分水管,分水管通过集箱内的集管与下降管相连。与已有的太阳能热水器相比,其分水管把真空管内的冷、热水流道分开,减少了冷热水流相互干扰,提高了热水器效率,同时实现了分体式太阳能热水器系统的自然循环。实验表明,带内集管的分体式太阳能热水器比不带内集管的分体式太阳能热水器有更高的效率。     

Refrigerant-charged integrated solar water heater

The performance of two R-11-charged integrated solar water heater collectors was investigated experimentally for forced and natural circulation water flows. The heat transfer from the refrigerant loop to the hot water storage tank took place through a condenser of novel design integrated within the collector frame. The effect of the condenser inclination on the system efficiency was remarkable for natural circulation water flow but had no significant effect for forced circulation flow. The difference in thermal response between the refrigerant and water loops caused buildup of stored energy in the condenser. This energy affected the buoyancy forces and generated flow pulsation that caused a harmonic-like variation of the system efficiency. This effect vanished with forced water circulation flow. The system efficiency varied between 20 and 50% depending on the solar insolation.     

Experimental observations on a continuous flow type domestic solar water heater

The operation of a continuous flow type domestic solar water heater is explained with the help of a schematic diagram. Steady state thermal analysis of such a water heater is carried out. A water heater of this type with a collector area of 1 m² is subjected to tests. The experimental results are compared with predicted results. The experimental results have also been compared with those obtained from a water heater operating on thermosiphon flow. The performance of the continuous flow type water heater is shown to be comparable to that of the thermosiphon flow type. It is concluded that, in the Indian context, the continuous flow type water heater has more advantages than the thermosiphon flow type water heater in view of its low capital cost and the ease of operation and maintenance.     

分体式家用太阳热水器

指出了传统太阳热水器存在的一些问题,为克服太阳热水器在高层建筑应用中受到的限制,研制了 一种靠重力循环的分体式家用太阳热水器。在冬季,用集中供暖系统中的热水为辅助热源加热蓄热水箱中的 水,以解决仅利用太阳能加热供水温度太低的问题,与利用辅助电加热相比,可降低运行费用。     

家用太阳热水器与太阳热水系统的技术经济比较

分析了户用太阳热水器和太阳热水系统工程的经济技术特点,对两者成本构成、项目财务净现值、投入回收期和财务内部收益率等有关指标进行了经济技术比较.分析比较表明,太阳热水系统与家用热水器相比,节省安装占地,与建筑相结合得好,在降低成本,缩短投资回收期,提高经济效益方面有明显的优势.     

Transient investigation of a two phase closed thermosyphon flat plate solar water heater

This work presents an unsteady state theoretical and experimental investigation of natural circulation two phase closed thermosyphon flat plate solar water heaters. The governing equations of the heater storage tank and connecting pipes are presented and generalized in dimensionless form, while the governing equations of the different components of the collector were previously discussed by the author. Also, the author's earlier simulation program of the collector is modified to include the solution of the dimensionless governing equations of the present analysis. For verifying the modified simulation program, a two phase closed thermosyphon solar water heater is designed, constructed and tested at different meteorological conditions, initial storage tank temperatures and different hot water withdrawal load patterns. The comparison between the experimental results and their corresponding simulated ones shows considerable agreement.     

Experimental studies of a new solar water heater system using a solar water pump

The research goal was to develop a new solar water heater system (SWHS) that used a solar water pump instead of an electric pump. The pump was powered by the steam produced from a flat plate collector. Therefore, heat could be transferred downward from the collector to a hot water storage tank. The designed system consisted of four panels of flat plate solar collectors, an overhead tank installed at an upper level and a large water storage tank with a heat exchanger at a lower level. Discharge heads of 1, 1.5 and 2 m were tested. The pump could operate at the collector temperature of about 70–90 °C and vapor gage pressure of 7–14 kPa. It was found that water circulation within the SWHS ranged between 12 and 59 l/d depending on the incident solar intensity and system discharge head. The average daily pump efficiency was about 0.0014–0.0019%. Moreover, the SWHS could have a daily thermal efficiency of about 7–13%, whereas a conventional system had 30–60% efficiency. The present system was economically comparable to a conventional one.