Arizona’s new heat officer said Friday that he is working with local governments and nonprofit groups to open more cooling centers and ensure homes have working air conditioners in a more unified effort to prevent another ghastly toll of heat-related deaths this summer.
That’s not air conditioning, at all.
That’s evaporative cooling, and it’s been used for hundreds of years in cultures worldwide to help reduce heat. Adding humidity into dry air naturally reduces the heat index. It’s not supposed to make it to the ground, the entire point is for it to evaporate and increase ambient humidity in the air.
It’s extremely energy efficient, but is limited to very dry environments. Above about 30% ambient humidity it quickly stops being effective at cooling the air, and at around 60% ambient humidity it’s just no longer noticeable. So for a desert area, it is an ideal, cheap and easy way to cool an area.
There are evaporative systems designed for homes and businesses that use the same principle. A box with an opening on one side for airflow, a large wet pad and a fan combined with ducting, will cool an entire home. It uses remarkably little water, and power only to run a simple pump to keep the pad wet and the fan spinning. It uses a fraction of the power and air conditioner uses and is a lot more effective when humidity is low.
For most of the summer an air conditioner isn’t even needed to cool a home. Central ducting with an evaporative cooler will work for 90% of the summer. Only during the monsoons where the humidity is too high for it to be effective is an AC system really necessary.
Source: I live in AZ and my home has both an evaporative cooler and an air conditioner.
Yup. Evaporative cooling was popular in AZ before electricity was available. In the late 1800s to early 1900s there were many homes and building with cooling towers on them. People would hang wet sheets across them and the cooling effect would create a current as it fell down the tower which would on turn create more draft across the cooling cloth.
I meant “like” as in similar to, not as a filler word. I know they’re not air conditioners. I was likening the design for descriptive purposes for people who live in less arid regions. It was especially surprising to see them aimed outdoors when I visited. When I asked a shop attendant about them, he said they were to keep tourists from passing out because they drink too much alcohol and not enough water. Haha