１引言随着人们生活水平的不断提高，对家庭生活热水供应的需求越来越迫切。从初期采用射吸原理进行凉、热水混合洗浴到现在，相应地出现了燃气式热水器、电加热式热水器以及太阳能热水器等。以上种种都在不同程度上给家庭的热水需求带来了一些方便，但也都存在着不尽如人... 1 Introduction With the continuous improvement of people’s living standards, the demand for domestic hot water supply is becoming more and more urgent. From the earliest days of adopting the principle of jet-sucking to cool and hot water baths, gas-fired water heaters, electric-heated water heaters, and solar water heaters have emerged accordingly. All of the above have brought some convenience to the family’s hot water demand in different degrees, but there are still many people...