太阳能热水器是将太阳辐射能转换成热能、把水加热的一种装置。我国常用的太阳能热水器,主要由集热器、水箱和循环管道三大部分组成。如图1所示(见下页)。集热器是太阳能热水器的关键部件。其造价占整个热水器系统的一半以上。它由吸热板、透明盖板、保温层和外壳四部分组成,其中吸热板最重要。习惯上,我们常用集热器吸热板的构造型式来命名太阳能热水器。例如,常用的集热器吸热板是管板式的,我们就叫这种热水器为“管板式热水器”。目前,管板式热水器在国内外已经得到了比较广泛的应用。它具有工艺简单、成本较低、承压高、寿命长等优点。北京市建成的四万 Solar water heaters are devices that convert solar radiation into heat and water. Solar water heaters commonly used in China, mainly by the collector, water tank and circulating pipe three major components. As shown in Figure 1 (see next page). Collector is a key component of solar water heaters. Its cost accounts for more than half of the entire water heater system. It consists of heat-absorbing panels, transparent cover, insulation and shell of four parts, of which the most important heat-absorbing plate. Habitually, we often use the heat collector structure of the collector to name the solar water heater. For example, the common collector heat sink is tube-plate type, we call this water heater “tube-plate water heater.” At present, the tube plate water heaters have been widely used at home and abroad. It has a simple process, low cost, high pressure, long life and other advantages. 40,000 built in Beijing