Joseph asks…
How can I make a geothermal plant for a science fair project?
I have entered a into science fair in which I plan on making a mini working geothermal plant. I need help on making one from scratch because I have little knowledge even compared to what I should know in order to make one. I am very enthusiastic about green energy solutions so please help. I want to make on that can at least light an energy saver light bulb. The more power it can produce the better. I would also like to know how to make a capacitor so that it can function properly. If any knows any websites that provide the plans or knows it in their head please let me know so that I may be able to make one. Or if anyone has contact information on a person that may be able to help please let me know that too. Thanks 
I will boil the water with fire don’t worry about the heat. I don’t think I can get it any other way. P.S. fire is approved. I am a grade 11 student
adminsta answers:
Lighting a light bulb on that small a scale would be tough to do. Unless you’ve got a very small, dim LED, it’s tough to get that much power from a small-scale model of a geothermal plant. How about if you just demonstrate the transfer of heat energy from one source to another, like how a geothermal heat system in a house would work? Study diagrams of how they work – you should be able to develop a model that includes the source of the heat (the sun or the earth), as well as how to transfer the heat to a colder area.
William asks…
Power & Energy Efficiency – Using heat (Kelvin)?
A power plant taps steam superheated by geothermal energy to 505 K (the temperature of the hot reservoir) and uses the steam to do the work in turning the turbine of an electric generator. The steam is then converted back into water in a condenser at 323 K (the temperature of the cold reservoir), after which the water is pumped back down into the ground where it is heated again. The output power of the generator is 84 MW. Calculate:
1) The maximum efficiency at which this plant can operate
2) The minimum amount of rejected heat (in MJ) that must be removed from the condenser every 24 hours
3) Express your answer to (2) in TJ and in PJ.
(Quick question – what would TJ and PJ mean? Terra joules and Peta joules or something?
adminsta answers:
Max efficiency possible for this PP= 1- Tc/ Th
= 1- 323/505 = 0.36
Total heat added= 84 / 0.36 = 233 MW
Min heat rejected= 233 – 84 = 149 MW = 149 MJ/s
in 24 hours:
heat rejected= 149 * 24 * 3600 MJ
= 12873600 MJ
= 12.87 TJ
= 0.01287 PJ
Nancy asks…
Energy alternatives???
Would it be feasible to build massive solar, wind, and geothermal power plants which solely do work to make Hydrogen fuel cells which are more portable, versatile, and efficient than most other methods. Could we do some method of this in the country to be completely independent of foreign oil and help stall the global warming process?
adminsta answers:
Yes today it is deffinetly possible to produce enough energy in all possible means without ever using petroluem oil, you just have to find people with money will to make it happen.
Carol asks…
questions to answerr about sciencee. answerr as many as youu cann.!?
1.) what are some solid energy recources from fossil fuels?
2.) What are some gas energy resources from fossil fuels?
3.) what does potroleum and natural gas form from?
4.) Which fossil fuel has the most and least amount of pollution ?
5.) how do nuclear power plants work?
6.) How does the sun get its energy?
7.) is there any limitations to geothermal energy productionn?
8.) What is the drawback to solor energy?
THnxx. :]
adminsta answers:
1 Coal, Peat
2 Natural Gas
3 from chemical processes involved in the breakdown of organic matter
4 Most pollution: coal
least pollution: natural gas
5 ?
6 By fusing hydrogen atoms into helium
7 In most places you have to dig very deep to access it, it is only readily accessible in areas that are near volcanic activity
8 It is very expensive, solar cells are expensive to make and only produce a little energy
8
Lizzie asks…
Can you check my answers?
Question 4/
The goal is to increase the power; therefore, it is necessary to
a)decrease the work being done and decrease the time in which the work was completed.
b)decrease the work being done and increase the time in which the work is completed.
c)increase the work being done or decrease the time in which the work is completed.
d)increase the work being done and increase the time in which the work was completed.
——————————————————————————————————-
Question 5/
Which statement best describes energy and matter in a closed system?
a)Energy and matter flow into and out of the system.
b)Energy can flow into and out of the system but matter cannot.
c)Energy and matter are contained within a closed system.
d)There is no energy in a closed system; there is matter.
————————————————————————————————-
Question 6/
Air pollution is a negative effect of using this renewable resource to generate power.
a)biomass
b)geothermal energy
c)hydroelectric energy
d)solar power
—————————————————————————————————————
Question 7/
What is pseudoscience? Pseudoscience is
a)a branch of science that does not require scientific proof.
b)a proven way to conduct science experiments.
c)something that resembles science but cannot be considered science.
d)specific procedures that we use in science to prove ideas.
————————————————————————————————————–
Question 8/
Whenever possible, these types of power plants should be built because they generate virtually no pollution.
a)biomass power plants
b)geothermal power plants
c)nuclear power plants
d)natural gas power plants
———————————————————————————————————–
Question 9/
Select the statement that correctly describes how light travels?
a)Light can travel in a vacuum, and its speed is constant even if the light source is moving.
b)Light can travel in a vacuum and will travel slower if the light source is moving in the same direction.
c)Light can travel in a vacuum, and it travels faster if the light source is stationary.
d)Light travels only through a medium, it travels faster if the light source is stationary.
4 – D
5 – C
6 – A
7 – C
8 – D
9 – A
adminsta answers:
4: C, Power is work/time.
5: correct
6: correct
7: correct
8: B, the water is heated deep inside the earth, there is no fuel necessary
9: correct
Mark asks…
Physics HW Please help?
A power plant taps steam superheated by geothermal energy to 485 K (the temperature of the hot reservoir) and uses the steam to do work in turning the turbine of an electric generator. The steam is then converted back into water in a condenser at 299 K (the temperature of the cold reservoir), after which the water is pumped back down into the earth where it is heated again. The output power (work per unit time) of the plant is 81,500 kilowatts.
(a) Determine the maximum efficiency at which this plant can operate.
(b) Determine the minimum amount of rejected heat that must be removed from the condenser every twenty-four hours.
adminsta answers:
The maximum possible thermal efficiency would be that of a Carnot Heat Engine
operating between T sub H = 485 K and T sub L = 299 K :
————————————————————————————————-
E sub THMAX = (T sub H – T sub L ) / ( T sub H )
E sub THMAX = ( 485 – 299 ) / ( 485 ) = 0.3835 = 38.35 % <———————[ a ]
E sub TH = W sub NET / Q sub A
Q sub R = [ (1 - E sub TH) / ( E sub TH ) ] [ W sub NET ]
Q sub R = [ (1 - 0.3835 ) / ( 0.3835 ) ] [ 81,500 ]
Q sub R = 131,000 kw. = 131,000 kj. Per sec.
Q sub R = ( 131,000 ) ( 3600 ) ( 24 ) = 1.132 x 10^10 kj. Per day <————[ b ]
I hope this presentation is helpful to you.
Lisa asks…
Thermodynamics & Heat Transfer question… Steam efficiency etc..?
A power plant taps steam superheated by geothermal energy to 505 K (the temperature of the hot reservoir) and uses the steam to do work in truning the turbine of an eletric generator. The steam is then converted back into water in a condenser at 323 K (the temperature of the cold reservoir), after which the water is pumped back down into the ground where it is heated again. The output of the generator is 84MW. Calculate:
The maximum efficiency at which this plant can operate.
The minimum amount of rejected heat (in MJ) that must be removed from the condenser every 24 hours.
Would appresiate if you showed working with the answer so i can work though it myself, but just the answer is fine. Cheers
adminsta answers:
The maximum efficiency of a heat engine operating between reservoirs at TH = 505K and TC = 323 K is:
Efficiency = 1 – TC/TH = 0.36
We can determine the minimum heat rejected, QC, using the 1st Law for a closed system, where the system is the heat engine.
QH – QC = W or QC = QH – W
So, we need to determine QH. We can use the efficiency to accomplish this since the efficiency of a heat engine is defined as:
Efficiency = W / QH
So: QH = W / Efficiency = 233 MW
Therefore, QC = 233 MW – 84 MW = 149 MW
QC = 149 MJ/sec * 24 hours * 3600 sec/hour
QC = 1.288×10^7 MJ
Enjoy !
Ruth asks…
ENVIROMENTAL SCIENCE HELP PLEASE?
PLEASE HELP by correcting my answers if wrong
1. A naturally occurring, usually inorganic solid that has a characteristic chemical composition, an orderly internal structure, and a characteristic set of physical properties is called
*A. ore.
B. clay.
C. a mineral.
D. shale.
2. A common feature of thermal pollution and artificial eutrophication is that they both
A. have sources that are difficult to identify and control.
B. cause large mats of algae to bloom in fresh water.
*C. are a result of power plants and other industrial activity.
D. decrease the amount of oxygen dissolved in water.
3. In the United States, which of the following would increase energy efficiency?
A. using public transportation and developing more efficient engines for vehicles
B. turning thermostats down in winter and up in summer
C. insulating homes and businesses
*D. all of the above
4. Interference with photosynthesis and reduced crop yields in land plants are examples of the damaging effects of
*A. greenhouse gases.
B. the ozone layer.
C. the climate.
D. ultraviolet light
5. A geothermal heat pump works by
A. creating flowing water which turns a turbine and generates electricity.
B. circulating fluid in a pipe underground and back to the surface to heat or cool a home.
*C. storing the sun’s energy and using it indirectly to heat water or a building.
D. producing electricity chemically by combining hydrogen and oxygen.
6. A true statement about greenhouse gases is that they
*A. convert sunlight into heat energy that warms Earth.
B. are concentrated in the stratosphere.
C. trap heat that is radiated upward from Earth.
D. are not affected by human activity.
7. Urban sprawl affects the environment because
*A. less land is available for food production.
B. fewer vehicles are needed for transportation.
C. more plants and trees are planted in these areas.
D. more water sources must be extended to these areas
8. Quarrying and solar evaporation are included in which type of mining?
A. smelting
*B. surface
C. placer
D. subsurface
9. Which of the following is NOT an environmental effect caused by deforestation?
A. effects on nearby organisms
B. soil erosion
C. destruction of wildlife habitats
*D. increased plant population
10. Hydroelectric energy is produced by
A. flowing water turning a turbine which generates electricity.
B. circulating fluid in a pipe underground and back to the surface to heat or cool a house.
C. heated water or steam pumped up from inside the Earth to power a turbine that generates electricity.
*D. storing the sun’s energy and using it to indirectly heat water.
adminsta answers:
1 I believe is C, based on “orderly internal structure.
2 I don’t know. A couple of those look like good answers, including what you chose.
4 is D
5 is B
6 is C
7 both A and D are good answers
10 is A. You are thinking of a form of solar energy, where sunlight is concentrated on tubes with flowing water.
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