Cooling drinking water using earthenware pitchers, botijo in Spanish, is an ancient method used satisfactorily in hot climate regions. The evaporation process through the ceramic wall of earthenware pitchers with different shapes and filled up with water is studied in this work when the surrounding ambient conditions remain steady. Thanks to the evaporation process, the water initially cools and later, once the minimum temperature is reached, it hots until either the ambient temperature is reached or the whole water evaporates. By using different analytical functions to model the botijo's shape and modeling mathematically the evaporation process by means of two ordinary differential equations, we have studied the behaviour of the different shapes. We have found that earthenware pitchers with small aspect ratios, large and isolated from ambient support bases, e.g. rested on a surface instead of hanged on something, are recommended to get better cooling. We also show that this can even be enhanced if their classical bulky belly is located as close to the bottom as possible.

使用陶罐投水器来冷却饮用水，西班牙语是botijo，是在炎热气候地区令人满意地使用的一种古老方法。当周围环境条件保持稳定时，将研究通过不同形状的陶壶的陶瓷壁蒸发并充满水的蒸发过程。由于蒸发过程，水首先冷却，然后冷却，一旦达到最低温度，它就会变热，直到达到环境温度或整个水蒸发为止。通过使用不同的分析函数对Botijo进行建模通过两个常微分方程，对形状和蒸发过程进行数学建模，我们研究了不同形状的行为。我们发现，建议使用长宽比较小，与周围支撑基座隔离的陶器投手，例如，将其放置在表面上而不是悬挂在物体上，以获得更好的冷却效果。我们还表明，如果他们经典的大肚子位于尽可能靠近底部的位置，这甚至可以得到增强。