China uses rooftop artificial rain to beat summer heat

For decades, air conditioners (ACs) have been the primary way to cope with extreme summer heat in many countries around the world. However, China is now adopting new methods to keep temperatures under control in densely populated apartment buildings during hot weather.

One such method has recently gone viral. Residents of a high-rise apartment building in Yuncheng located in Shanxi Province, China reportedly no longer need air conditioners. Instead, an artificial rain system installed on the building’s rooftop cools the surrounding air and surface temperatures by 5 to 8 degrees Celsius within minutes.

According to Chinese media reports, the system uses a sensor-based misting system that releases water through nozzles installed on the roof. The fine water droplets fall around the building creating an experience similar to natural rainfall. The artificial rain system works on the scientific principle of evaporative cooling.

It sprays an extremely fine mist into the air and as the tiny droplets evaporate, they absorb heat from the surrounding environment lowering the air temperature. This process is similar to the way sweat cools the human body.

The system is specifically designed to operate during very hot weather, when the water droplets can quickly evaporate after coming into contact with warm air. Compared with traditional air conditioning, this cooling method consumes significantly less energy.

Similar misting systems are also being used in various parks, public squares and bus stops across China to help people stay cool during periods of extreme heat.