I need a Nice scienctic title for my high school science fair project..My Project is this….
When people think of deserts, they picture a barren wasteland devoid of all water. Through this experiment I will show how water can be generated, cleanly and affordably from the atmosphere. The application of this generator can benefit our society both commercially and financially. If people can generate their own water they will save money on their water bill and put less strain on our current water supply. This generator can be easily converter to satisfy any energy source, from solar and wind to traditional energy sources.
And if you have any ideas, tips or comments on improving my project, please help
Well, water can be extracted from air. Your air conditioner is a device which accomplishes this task. If you use your air conditioner in a humid region, you will see a flow of condensate draining from the device. In the case an air conditioner operating in humid regions, you usually discard the condensate. Here you are looking for a system which will save and use the condensate as domestic water.
Will it work in a dry region? It will, but it will be much more difficult. And its economics may not be as ideal as you may think. I’ll give you some typical data and show you just how expensive the water will be. At your request, I will e-mail you how I did my calculation if you are interested.
Condition of naturally existing air in a dry region:
Temperature: T1 = 30 C
Relative humidity: phi1 = 25%
Air pressure: P1 = 100 kPa
System of extracting water:
You limit the refrigeration device from cooling air below T2=2 C (to prevent formation of ice).
COP of ideal vapor-compression refrigeration operating between T1 and T2 with refrigerant R134a: COP = 8.5
Price of electricity: 4 ¢/Megajoule. This is equivalent to about 15 ¢/kw-hr.
——————–
Results of interest (all per kilogram or liter of water desired, unless otherwise stated):
Mass of incoming air required: m[1] = 447.5 kg
Minimal Refrigeration load: Qnet = 15.13 MegaJoules
Electrical energy required: Wreq = 1.781 MegaJoules
Price per liter of water: CPL = 7.124¢
Price for about four liters of daily drinking water (likely needed in dry climate): 30¢
Price for about 350 liters, typical daily use for all purposes: $25
Comments:
I think $25 every day is a lot of money to pay for my daily water use. Also, we cannot use this air directly in our homes, because it will be too dry to for human comfort once it is warmed. We will need to route it in ducts around our house (to cool our house without accepting the air’s mass) and then exhaust it to the background.
Another practical consideration is that a lot of non-water build-ups occur on the outside of evaporator coils. We will need a good design of filtration to prevent dirt and mold from become part of our water supply.
What you say is impossible unless I am missing something and the laws of physics were changed over night.
I see no problem with calling it water out of thin air though.
References :
Well, water can be extracted from air. Your air conditioner is a device which accomplishes this task. If you use your air conditioner in a humid region, you will see a flow of condensate draining from the device. In the case an air conditioner operating in humid regions, you usually discard the condensate. Here you are looking for a system which will save and use the condensate as domestic water.
Will it work in a dry region? It will, but it will be much more difficult. And its economics may not be as ideal as you may think. I’ll give you some typical data and show you just how expensive the water will be. At your request, I will e-mail you how I did my calculation if you are interested.
Condition of naturally existing air in a dry region:
Temperature: T1 = 30 C
Relative humidity: phi1 = 25%
Air pressure: P1 = 100 kPa
System of extracting water:
You limit the refrigeration device from cooling air below T2=2 C (to prevent formation of ice).
COP of ideal vapor-compression refrigeration operating between T1 and T2 with refrigerant R134a: COP = 8.5
Price of electricity: 4 ¢/Megajoule. This is equivalent to about 15 ¢/kw-hr.
——————–
Results of interest (all per kilogram or liter of water desired, unless otherwise stated):
Mass of incoming air required: m[1] = 447.5 kg
Minimal Refrigeration load: Qnet = 15.13 MegaJoules
Electrical energy required: Wreq = 1.781 MegaJoules
Price per liter of water: CPL = 7.124¢
Price for about four liters of daily drinking water (likely needed in dry climate): 30¢
Price for about 350 liters, typical daily use for all purposes: $25
Comments:
I think $25 every day is a lot of money to pay for my daily water use. Also, we cannot use this air directly in our homes, because it will be too dry to for human comfort once it is warmed. We will need to route it in ducts around our house (to cool our house without accepting the air’s mass) and then exhaust it to the background.
Another practical consideration is that a lot of non-water build-ups occur on the outside of evaporator coils. We will need a good design of filtration to prevent dirt and mold from become part of our water supply.
References :