For my 9th grade science exhibition in Indus International School Hyderabad, my classmate An uttam Reddy and I built a Solar-Powered Water Cooler.
Idea: Now days due to global warming, the temperature has changed drastically, even though we are a month away from summer, the mercury is rising rapidly and we are nearing the low 40’s (Celsius). We thought that we should build something that can give the comfort of a cool air and run on low energy as the main cause of global warming is the enormous magnitude of the emission of harmful due generating power from non-renewable sources of energy to satisfy our ever increasing demand for electricity , and then we thought – a solar-powered water cooler! It uses very amount of resources: only a small amount of water – and whatever electricity that would be consumed would be created by a solar panel. So in the end there is no usage of electricity – and you can be air-conditioned!
Note: Ive taken this above passage from a document I created before we started this project, you can note how immature and narrow minded we were, completely neglecting the costs of solar panels, large car batteries, and inverters which all amounted to thousands of dollars (no we didn’t buy them, we borrowed them).
- Tulu Pump
- 80cc Motor
- Straw Pack
- Solar Panel
I got the battery, the panels, and the inverter from a kind company called Solar Semiconductor, and the materials used to build the water cooler were from third-party water cooler manufacturers in Koti, Hyderabad.
Simple Explanation of how an aircooler works:
As everyone knows change of state of matter requires energy to take place, and what is the energy that we need the least of all in summer? Heat energy! The water which will fall on the straw pack (in the form of mist so evaporation can take place much faster), will evaporate drawing in the heat needed to change its state of matter from the surroundings, thus creating cool air. Then the fan powered by the motor will blow the cool air towards the designated target reducing the temperature of the target.
After constructing the water cooler I needed to obtain the solar panels and the batteries – well that’s all that I thought I needed. When I got to the factory of Solar Semiconductor I realized how difficult and expensive it is to produce solar energy. Instead of a small panel and a battery I came home with two 225 W Solar Panels, 400 KGs ofbatteries, 50 feet in wires, and a nice inverter.
How the Solar Aspect of Our Project Works
- When photon particles of light hit the silicon of the solar panel, electrons are produced and are collected by the stripes in the panel then the are sent out of the panel by an output wire.
- This output wire leads to the inverter, then the inverter stores the energy which is in the form of Direct Current (or DC) inside the batteries.
- When there is an demand for electricity by the main output (my cooler), the electricity in the DC form goes to the inverter – gets converted into AC form of electricity then it is sent to my air cooler and it works!