Solar water heaters are devices that use energy from the sun to heat water.

太阳能热水器是一种吸收太阳能的辐射热能来热水的设备。

Solar water heating is used around the world.

它的运用遍及世界各地。

The solar water heater described here is based on a design developed some years ago in Afghanistan.

这里所要介绍的这种太阳能热水器是基于很多年前在阿富汗研制的一种款式的热水器。

Since then, it has been built and used in many countries.

自那时以来，它开始在很多国家建立和使用。

It can heat seventy liters of water to sixty degrees Celsius.

在平均室外温度在 32 摄氏度的晴天里。

It can do this between sunrise and noon on a clear day with an average outside temperature of thirty-two degrees Celsius.

从日出到中午时，这种热水器能把七十升水加热到六十摄氏度。

There are two parts to the solar water heater. One part is made of a sheet of metal painted black.

太阳能热水器由两部分组成。 一部分是一层被涂黑的金属层。

This metal surface, placed in contact with the water, will heat the water.

金属涂层的表面与水接触，并给水加热。