Enhancement of natural circulation type domestic solar hot water system performance by using a wind turbine

Performance improvement of existing 200 litres capacity natural convection type domestic solar hot water system is attempted.A two-stage centrifugal pump driven by a vertical axis windmill having Savonius type rotor is added to the fluid loop.The windmill driven pump circulates the water through the collector.The system with necessary instrumentation is tested over a day.Tests on Natural Circulation System(NCS)mode and Wind Assisted System(WAS)mode are carried out during January,April,July and October,2009.Test results of a clear day are reported.Daily average efficiency of 25-28% during NCS mode and 33-37% during WAS mode are obtained.With higher wind velocities,higher collector flow rates and hence higher efficiencies are obtained.In general,WAS mode provides improvements in efficiency when compared to NCS mode.     

宾馆的卫生热水循环系统

介绍了一个简洁实用化的宾馆卫生热水供应系统,并通过实例对两种卫生热水供应用系统作了可操作性和投资运行性两方面的比较,结论是减少了初投资的10％和运行电费的60％。     

关于常压热水锅炉的系统设置和节能

常压热水锅炉在国内已有广泛的应用,但常压热水锅炉房目前尚无权威的设计布置方法,而导致安全事故常有发生。在这种锅炉的布置中必须有通大气管和锅炉热水箱。循环热水泵应设于锅炉的出口。在循环热水泵选型时,其压头应为热用户与锅炉房的高程差及管网阻力之和,回水管路上必须设启闭网和阻力调节阀。常压锅炉的节能特性应视热水管网的构成情况具体分析。这种锅炉大体上用在低层、低参数、小容量的场合较为合适。     

热水锅炉水循环故障分析与改造

从一种典型锅炉入手,分析水循环故障原因,提出解决办法和改进措施。通过对SZW4.2-0.7-95/70-AⅡ型热水锅炉的进水方式的改变,使得水冷壁内水的流速尽量达到或接近安全流速,使目前频繁爆管的现象有所改观或彻底解决这个问题。     

别墅型太阳能中央热水系统

介绍了别墅型太阳能中央热水系统的组成、工作原理和性能特点,并与其它形式的热水系统的综合性能进行了比较.实际工程应用表明:别墅型太阳能中央热水系统是一种节能、环保、安全、高效的热水装置,每平方米太阳能热水器的年平均获热量(每年按360 d计)相当于1 200 kWh的电力、500 kg煤和180 kg液化气通过相应装置得到的热量.     

Performance enhancement of an integrated collector storage hot water system

Integrated collector storage (ICS) systems offer a solution to reduce the height of the conventional flat-plate thermosiphon type collectors. The initial system developed had an aperture area of 1.77 m², a receiver diameter of 200 mm, a concentration ratio of 1.47 and total water storage volume of 65 litres. The main disadvantage of the ICS systems comes from their design, i.e., because the collector absorber is also the storage cylinder it is not possible to insulate it properly and therefore there are significant losses during the night. The main cause of these losses is the convection currents created during the night, circulating around the top glass cover. Another disadvantage of the system is its draw-off characteristics. Because the water cylinder/absorber is horizontal there is very little stratification of the water in the cylinder. It is suggested that a primary 110 mm diameter cylinder is introduced at the space between the main cylinder and the glass. The cold water is introduced directly to the primary cylinder, which feeds the main cylinder. With this modification the convection currents are drastically reduced due to the obstruction created by the primary vessel, thus reducing the night thermal losses. Also as the cold water is introduced first to the primary cylinder there is no direct mixing of the two streams thus greatly improving the system draw-off characteristics. This modification creates an 8% increase in the total cost of the system, which is reasonable, if the above benefits are considered     

热水采暖系统改造的启示

供暖系统普遍存在用户冷热不均,燃料耗量高,电力消耗量大的问题,已经到了必须认真解决的时候了。本文通过工程实例说明,解决这个“老大难”部下的基本途径和方法。     

运行状态下太阳热水系统热性能测试方案

按照热力学原理、根据国家标准对已竣工的江苏五台山体育中心游泳馆太阳热水系统工程,提出了运行状态下的系统热性能验收测试方案,进行了测试工作,并取得测试结果.所提出的运行状态下的系统热性能验收测试方案,解决了工程热性能验收问题,具有实用价值.     

中水源热泵用于生活热水系统方案设计

结合工程实例,详细介绍了利用水源热泵进行学校浴室废水热能回收的方案设计,并对该系统和传统燃气锅炉系统的年运行费用进行比较。结果表明该系统具有很好的节能潜力。     

连接方式对自然循环太阳能热水系统的影响

以国标GB／T18708—2002《家用太阳热水系统热性能试验方法》为依据,针对自然循环平板式太阳能热水系统在连接方式不同的情况下,其热性能的差异进行了对比试验,并从自然循环系统循环动力——热虹吸压力的角度分析了两种连接方式下热性能差异的原因。