百叶型集热墙不同百叶倾角对室内温度影响研究

提出在现有的被动式太阳能集热墙的空气夹层中悬挂涂有选择性吸收涂层的百叶窗帘,组成新型结构的百叶型集热墙。利用可对比热箱实验平台,测试研究百叶型集热墙的集热性能,分析对比不同角度叶片对室内温度的影响。实验结果显示,在室内无热源情况下,叶片角度设置在45°时的集热效果最好,装有百叶型集热墙的房间的平均温度最高比普通房间高出12.6℃,能显著提高室内环境温度,改善室内热环境,降低室内热负荷。     

集热蓄热墙保温构造形式优化及适应性分析

将集热蓄热墙物理模型简化,采用数值模拟和实测验证相结合的方法研究不同保温构造形式下墙体的动态集热供热特性。结果表明:外保温构造的集热蓄热墙,其对流供热量受太阳辐照变化敏感,昼间瞬时供热量大,集热效率最高;而采用内保温、无保温时,二者规律相似,墙体蓄热能力强,供热量在时间上分布更为均匀。通过对集热蓄热墙式太阳房室内热环境的模拟计算分析,提出拉萨地区集热蓄热墙宜采用无保温或内保温形式,且可基本满足全天热舒适需求;西宁地区采用外保温形式时,可满足白天时段房间的供暖需求,夜间尚需其他主动采暖配合。     

新型太阳能集热墙冬季保温性能分析

建立新型结构的太阳能集热墙,给出新型太阳能集热墙的结构组成.利用CFD技术对新型太阳能集热墙系统采暖房间的温度场进行了模拟,给出室内温度场的分布规律,并分析了室内温度日变化情况;通过对比分析新型太阳能集热墙与传统太阳能集热墙的温度场分布,验证了新型太阳能集热墙具有良好的保温节能性能.     

太阳能墙式热管集热蓄热装置

本实用新型是一种用集热热管和蓄热水箱相结合,并且使水箱与房屋墙壁有特殊接触的为房屋建筑供暖和供热水装置。该装置以热管做为太阳能热转换的主要部件,同时,集热部分由密闭式透明罩层、吸热管板、保温墙及采光窗组成,蓄热部分由带有可拆     

新型太阳集热器冬季热性能理论研究

研究一种新型百叶式太阳集热器的冬季集热性能,建立基于一维假设条件下的热网络和流动宏观模型,模型的有效性通过了实验验证。利用该模型进行理论计算,讨论结构尺寸、百叶角度及集热板材料等因素与出风口空气温度、通风量、有效利用能及集热效率之间的关系。结果表明,适当增大体型比、百叶角度和风口尺寸有助于提高新型百叶太阳集热器的热性能,夹层内空气体积流量是影响有效利用能或集热效率的关键因素。     

光热复合催化Trombe墙性能及百叶角度调控策略研究

太阳能热催化技术利用太阳全光谱产生集热和降解甲醛,太阳能光热复合催化技术是一种可以同时利用光和热产生热量并降解甲醛的高效技术。分别将热催化、光热复合催化百叶技术应用到Trombe墙系统,实现采暖的同时,能够利用太阳光降解室内气态污染物。建立热催化、光热复合催化百叶Trombe墙传热传质模型并进行实验验证,基于模型探究热催化百叶Trombe墙和光热复合催化百叶Trombe墙在南京和北京冬至日(9:00—17:00)气象参数下百叶全天最佳调控策略。结果表明,建立的传热传质模型预测与实验数据符合度较高。同一百叶Trombe墙系统,不同地区的最佳百叶角度不同;对于热催化百叶Trombe墙,南京全天最佳百叶角度下,产生的热量和干净空气量分别为5.6 MJ/d、196.7 m³/d,北京分别为4.6 MJ/d、167.9 m³/d;对于光热复合催化百叶Trombe墙,南京全天最佳百叶角度下,产生的热量和干净空气量分别为6.7 MJ/d、205.6 m³/d,北京分别为5.4 MJ/d、174.8 m³/d;在全...     

多孔介质太阳能集热组合墙的耦合传热与流动分析

针对接触型和分隔型多孔介质太阳能集热组合墙系统,分析了太阳辐射及环境温度变化时,组合墙内传热与流动变化.多孔介质太阳能集热组合墙中,多孔介质起半透明隔热体和蓄热体的作用.多孔介质集热层的孔隙率、粒径、材料热导率和多孔介质集热层在组合墙中的位置对系统的采暖效果影响较大.     

专利信息

太阳能利用一种企箱式太阳能热水器专利申请号:CN201020141567.8公开号:CN201628397U申请人:陈公亮本实用新型为一种企置水箱、横位插管、顶出热水、附墙安装的太阳能热水器。其特征为:集热水箱设为竖向安装,全密封,仅留冷水进口与热水出口。真空集热管封其大口,改用短小管口,横     

多太阳能集热蒸发器并联热泵系统的实验研究

建立多太阳能集热蒸发器并联热泵系统的实验装置,分析在正常和恶劣工况下,太阳能热泵集热蒸发器的热性能。结果表明,在相同太阳辐照量的条件下,各太阳能集热蒸发器出口处过热度与压缩机进口处过热度基本一致,且均能正常工作;不论在正常工况还是恶劣工况下,蒸发器阵列的整体性能均可满足要求;通过比较多太阳能集热蒸发器并联热泵热水系统与空气源热泵热水系统COP可知,多太阳能集热蒸发器并联热泵热水系统COP基本维持在5.0～6.0之间,相比于空气源热泵热水系统COP在2.0～3.0之间有明显优势;证明多太阳能集热蒸发器并联形成一个大的太阳能热泵系统是可靠的。     

太阳能集热墙与地下室复合系统冬季供暖试验研究

提出一种适用于被动式太阳能空气供暖的地下室蓄热系统,并对西北严寒地区采用该系统的农村住宅进行供暖试验研究。通过试验,分析太阳能集热墙与地下室复合系统对室内热环境的影响。试验结果表明:有太阳能集热墙与地下室复合系统的房间内平均空气温度比对比房的室内空气平均温度高7.5℃,最高温差达13.6℃,最低温差为2.5℃。通过对太阳房供暖节能率的分析计算得出其节能率为62.3%,验证在该地区建立太阳能集热墙与地下室复合系统建筑的可行性和经济性。     

多功能太阳能空调制热兼制热水模式负荷平衡控制策略的研究

为了解决多功能太阳能空调制热兼制热水工况时空调和热水的能量输入与各自的负荷平衡问题,提出了通过调节热水换热器水体积流量以改变空调传热量和热水传热量的控制策略.以空调负荷作为控制目标,建立了神经网络辨识和模糊控制模型,并进行了仿真研究.结果表明,神经网络预测和模糊控制相结合的方法对热水换热器水体积流量的智能调节能有效地解决负荷平衡问题.     

通水除热管板应用于屋面结构中的模型实验研究

针对夏热冬暖地区的屋顶在夏季受太阳辐射强度大的问题,开发一种新型通水除热管板,将该通水除热管板应用于屋面结构中,构成新型通水除热屋面,可以有效改善夏热冬暖地区顶层屋面的热工性能,在间歇空调状况下,同时达到节能和舒适的目的。通过搭建模型实验台进行模型实验来研究通水除热屋面的隔热性能,得出主要结论如下:将铝制通水除热管板埋入屋顶找坡层,在17:00左右通水,此工况下对屋顶内表面有一定的降温效果,阻止晚间屋顶内表面温度的升高,降低了晚间空调的冷负荷,对夏热冬暖地区居住建筑有着重要的应用价值。     

1 025 t/h锅炉再热器超温处理及可行性分析

针对某1 025 t/h锅炉再热器管壁超温、减温水量大的问题,通过现场试验、数值模拟和热力计算等方法,分析管壁超温和减温水量大的原因,提出燃烧调整和受热面改造方案。研究表明：该锅炉末级再热器出口管壁温度存在较大偏差,烟道中间及右侧部分管壁超温,原因在于炉膛出口的烟温偏差;通过将燃尽风由四角均匀配风调整为左侧风门开度50%、右侧风门开度100%,降低了炉膛出口左右两侧的烟温偏差,进而减小了再热器出口的壁温偏差;针对锅炉再热器、过热器减温水量大的问题,进行二次风优化调整,当二次风正塔配风时炉膛出口温度比二次风均等配风和束腰配风时有所降低,有利于降低减温水量;该炉二次风配风优化难以从根本上解决减温水量大的问题,为此提出减少再热器、过热器受热面及增加省煤器受热面的改造方案,使减温水量在不同负荷下均能满足锅炉运行要求。     

被动蒸发冷却技术在双层皮玻璃幕墙的应用

双层皮玻璃幕墙较之传统幕墙更好地为建筑提供夏季隔热和冬季保温。本文提出将被动蒸发冷却技术应用于双层皮玻璃幕墙结构,通过在双层皮玻璃幕墙内设置水被动冷却蒸发系统,当夹层温度过高时水自动喷出或流出,达到降低夹层温度、提高隔热性能的目的,以提高双层皮玻璃幕墙对夏季炎热气候的适应性。     

Experimental study of the burning-cave hot water soil heating system in solar greenhouse

In the northern China areas, the traditional heating methods are widely used in solar greenhouse, for example: electric heating, hot air heating, hot water heating, burning-cave heating etc. If copying the assuring building indoor environment of constant heating ways into solar greenhouse, it will further increase building energy consumption, thus improving the efficiency of energy utilization, establishing appropriate growing environment, and realizing the agricultural waste recycling are important ways of consistent with the Chinese conditions, construction of sustainable development, improving the efficiency of the greenhouse production. To solve the problem of traditional heating method for high heating energy consumption, the inharmonious between greenhouse air temperature and soil temperature, uneven soil temperature, the research build the burning cave hot water soil heating system of solar greenhouse experimental platform in accordance with principle of energy cascade utilization. This experiment platform will transfer burning cave internal heat into soil heating system. The soil is evenly heated by system. Through testing the actual operation effect of the burning cave hot water soil heating system of new solar greenhouse, electric heating system, no taking any heating measures system, burning cave hot water soil heating system of solar greenhouse can improve the soil average temperature 5 ∼ 6 °C. This research provides experimental basis for practical applications and promotion.     

Soil temperature distribution around a U-tube heat exchanger in a multi-function ground source heat pump system

The imbalance of heat extracted from the earth by the underground heat exchangers in winter and ejected into it in summer is expected to affect the long term performance of conventional ground source heat pump (GSHP) in territories with a cold winter and a warm summer such as the middle and downstream areas of the Yangtze River in China. This paper presents a new multi-function ground source heat pump (MFGSHP) system which supplies hot water as well as space cooling/heating to mitigate the soil imbalance of the extracted and ejected heat by a ground source heat pump system. The heat transfer characteristic is studied and the soil temperature around the underground heat exchangers are simulated under a typical climatic condition of the Yangtze River. A three-dimensional model was constructed with the commercial computational fluid dynamics software FLUENT based on the inner heat source theory. Temperature distribution and variation trend of a tube cluster of the underground heat exchanger are simulated for the long term performance. The results show that the soil temperature around the underground tube keeps increasing due to the surplus heat ejected into the earth in summer, which deteriorates the system performance and may lead to the eventual system deterioration. The simulation shows that MFGSHP can effectively alleviate the temperature rise by balancing the heat ejected to/extracted from underground by the conventional ground source heat pump system. The new system also improves the energy efficiency.     

An experimental study of façade-integrated photovoltaic/water-heating system

The worldwide fast development of building-integrated solar technology has prompted the design alternatives of fixing the solar panels on the building façades. How to make full use of an integrative system to achieve the best energy performance can be an important area in the technology promotion. Hybrid solar system applying in buildings has the advantage of increasing the energy output per unit installed collector area. This paper describes an experimental study of a centralized photovoltaic and hot water collector wall system that can serve as a water pre-heating system. Collectors are mounted at vertical facades. Different operating modes were performed with measurements in different seasons. Natural water circulation was found more preferable than forced circulation in this hybrid solar collector system. The thermal efficiency was found 38.9% at zero reduced temperature, and the corresponding electricity conversion efficiency was 8.56%, during the late summer of Hong Kong. With the PVT wall, the space thermal loads can be much reduced both in summer and winter, leading to substantial energy savings. Suggestions were given on how to further improve the system performance.     

Experimental investigation of a multi-function heat pump under various operating modes

Heat pumps have been spotlighted as efficient building energy systems because they have great potentials for energy reduction in building air conditioning and reducing CO₂ emission. In this study, a multi-function heat pump which has the functions of heating, cooling, and hot water supply was designed and its performance was investigated according to operating modes. In the cooling-hot water mode, the capacity and COP were enhanced as compared to other modes because the waste heat from the outdoor heat exchanger was utilized as useful heat in the indoor heat exchanger. In the heating and hot water supply mode, the compressor speed should be increased to get appropriate heating and hot water capacities. For all operating modes, the system could be optimized by adjusting the superheat.     

室内空调条件下孝感市建筑物屋顶、墙体的隔热节能指标的选取

根据建筑物热工气候分区,对夏热冬冷地区的孝感市运用“建筑热环境与建筑节能设计标准相关控制法”中所提出的简化公式及孝感市的气象参数,计算出了室内空调条件下建筑物屋顶、墙体的隔热控制和节能控制指标,为我国夏热冬冷地区及其他地区建筑的隔热和节能控制设计提供参考依据。     

带饮水机的多功能电冰箱设计

在传统电冰箱的基础上,另独立设置2个保温箱贮存冷热饮用水。冷水制取是在冷水箱中设置蒸发器,将冷水箱中的水制冷。热水制取是在热水箱中设置逆流套管式冷凝器,利用制冷系统的排热量将饮水机中的水加热到一定温度,如温度不够则再通过电加热器,可将饮用水加热至沸腾,冷凝管通热水箱后可采用风冷式和水冷却两种方式相结合。根据设计和理论计算,多功能电冰箱的冷凝器可将饮用水加热到65℃左右,再用电加热器,可将饮用水加热至沸腾,比市场上纯粹用电加热的饮水机可节电22.31W;利用制冷系统将冷水箱中的水制冷,每产生4℃冷饮用水2L比市场上一般的压缩式制冷饮水机可节约大约2.3×105J的能量。