Active Solar Energy
Learn more about Active Solar Energy at the website RouhNeckChronicles.com.
Q: how are passive and active solar energy systems different?
how are passive and active solar energy systems different?
A: Passive:
http://en.wikipedia.org/wiki/Passive_solar
Active:
http://en.wikipedia.org/wiki/Active_solar
Q: how can passive and active solar energy be used in a home?
how can each individual one be used in a home? I need help on my physics project can anyone help me out?
A: Active- Solar powered calculators
passive- ??????
Q: Can you describe the differance between passive and active solar energy, provide an example of each?
And how do systems help the earths enviroment?
A: Ask GOOGLE
Q: what is the difference between passive and active solar energy?
I am doing a physics project and i cant find the diffrence between the two. can someone help me and give me as much details as you can
A: Many technologies use solar energy. Some classifications of solar technology are active and passive
Active solar systems use electrical and mechanical components such as tracking mechanisms, pumps and fans to process sunlight into usable outputs such as heating, lighting or electricity. Active solar technologies are employed to convert solar energy into usable heat, cause air-movement for ventilation or cooling, or store heat for future use. Active solar uses electrical or mechanical equipment, such as pumps and fans, to increase the usable heat in a system. Solar energy collection and utilization systems that do not use external energy, like a solar chimney, are classified as passive solar technologies.
Solar hot water systems, except those based on the thermosiphon, use pumps or fans to circulate water, an anti-freeze mixture, or air through solar collectors, and are therefore classified under active solar technology. The solar collectors can be nonconcentrating or ‘flat-plate’, or of various concentrating designs. Most solar-thermal collectors have fixed mounting, but can have a higher performance if they track the path of the sun through the sky. Solar trackers, used to orient photovoltaic arrays, may be driven by either passive or active technology. Active solar-thermal systems, via small pumps or fans, can have significantly higher solar savings fractions than passive solar technologies due to greatly-enhanced heat transfer and transport. An interesting hybrid approach is to use photovoltaics to power pumps or fans. A computer analysis, using thermodynamics and heat transfer software, can be used to compare the performance of various active and passive solar thermal strategies
Because passive solar systems require no additional energy to operate and therefore have zero operating costs, emit no greenhouse gasses in operation, and can have low maintenance costs, passive solar technologies should be given full consideration. Passive solar technologies convert sunlight into usable heat, cause air-movement for ventilation or cooling, or store heat for future use, without the assistance of other energy sources. Technologies that use a significant amount of conventional energy to power pumps or fans are classified as active solar technologies. Some passive systems use a very small amount of conventional energy to control dampers, shutters, night insulation, and other devices that enhance solar energy collection, storage, and use.
Passive solar technologies include direct gain and indirect gain for space heating, solar water heating systems based on the thermosiphon, use of thermal mass and phase-change materials for dampening indoor air temperature swings, solar cookers, the solar chimney for enhancing natural ventilation, and earth sheltering.
More widely, passive solar includes technologies such as the solar furnace and solar forge, but these typically require some external energy for aligning their concentrating mirrors or receivers, and historically have not proven to be practical or cost effective for wide-spread use. ‘Low-grade’ energy needs, such as space and water heating, have proven, over time, to be better applications for passive solar energy utilization.
Passive solar systems use non-mechanical techniques of controlling, converting and distributing sunlight into usable outputs such as heating, lighting, cooling or ventilation. These techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the sun. Passive solar systems have little to no operating costs, often have low maintenance costs, and emit no greenhouse gases in operation. They do, however, need to be optimized to yield the best performance and economics. Energy conservation reduces the needed size of any renewable or conventional energy system, and greatly enhances the economics, so it must be performed first. Passive solar technologies often yield high solar savings fractions, especially for space heating; when combined with active solar technologies or photovoltaics, even higher conventional energy savings can be achieved.
Q: Can a person make residential active solar energy a positive return on investment in Boston area?
I am as green lov’n as the next guy but can a solar panel system pay for itself in <10 years in Boston area even if electric rates increase 3% per year?
A: No. Not enough sunlight to be practical or cost effective. Wind generator might work better there.
Q: How Much Green Home Energy Does An Active Solar Energy System Provide?
A: Active solar energy can power 40-80% of your home energy needs. Anything less than 40% is not cost effective. Besides home heating, active solar is awesome for air conditioning, detoxification of contaminated water and thermoelectric power generation.
For maximum ‘green’ power, position your solar collectors true south, tiled at an angle equal to your latitude plus 15°. The best time is 9am to 3pm when the collectors receive the most sun rays. It’s good for energy collection and optimum storage.
Q: What is the numerical energy efficiency for wind energy, passive solar energy, and active solar energy?
Help!!!
A: Wind power companies like to claim ~35% efficiency with their systems but the best recorded in operation is a maximum of 20%
Solar panels are incredibly inefficient with efficiency ratings of less than 2% of energy emitted adsorbed into energy.
Ambient /Reflective solar energy systems believe it or not are more efficient around 10% in adsorbing energy but the turbines used to turn the energy into electricity are only around 20% efficient so the number is only 2%
The trick with solar is to use the energy collected by the reflectors for heating something to get the efficiency of the heat created. that’s why they make good water heaters.
By the way gas and diesel piston engines are only 20 to 30 % efficiency, Gas turbine engines are around 50% but if used as a co-gen unit where both the engine created energy and heat are utilized their efficiencies go into the 90% level.
It’s part of the reason gas turbine power plants are so comon.
Q: Who would be against Active Solar Energy and why?
Are there people who are against using Active Solar Energy? if so, who and why??
A: Yeah, they’re the people who get paid by the oil, natural gas, and coal industries to bad mouth free energy.
Q: Can some one explain to the minions the difference between active and passive solar energy?
I’ve been to green living enviromental etc…theres some really strange people thinking that all solar energy is bad.Help the ignorant please.
anything you want it to be from your spelling.
A: Why does anyone think any solar energy is bad (did they get a sunburn?). Anyway, I think the difference between active and passive solar energy is that passive solar energy is the absorption of the heat from sunlight to heat space in a house, pre-heat water going into water heaters or heating pool water. Active solar would be solar panels that generates electricity, etc. I’m not positive, but that may be the difference.
Q: what is the energy efficiency of passive and active solar energy?
its for a science project
A: I don’t know how to state this in measurable terms like kilowatts or BTU’s; you might want to ask a physicist that.
Passive soar energy (such as filling black plastic barrels near windows (in the N hemisphere these windows would have to be facing South) would absorb heat from the Sun during the daytime and release it at night. This is very inexpensive to set up, but the barrels take up a lot of room.
People I knew in Maine dug the foundation for their house directly into the side of a hill. Their house had only one external wall facing south. On most days they received enough solar energy to stay toasty. On really cold days and nights they had to burn small amounts of wood in their cooking stove.
I think this was the most energy efficient home I’ve ever seen.
Solar panels are relatively expensive, but now companies are producing flexible solar sheets, which are much more adaptable for home use. I’m not sure of their cost either. Usually solar power is photovoltaic – it takes solar energy and concerts it to electricity. The surplus must be stored, and that usually means at least a maritime battery, an expensive unit.
A good source for solar energy is Popular Science magazine.
Q: where can i find information on active solar energy? im doing a project and need lots of information?
anything!!!
A: Homepower and solar today magazines
Q: If we had solar energy how would the energy be active at night?
I have a research paper due and I have no idea how to answer this question?
Please be Pro Solar Enegy.. I based my whole research on the pro causes of Solar Energy.
A: When it comes to solar power systems, you need to have two basic components which are a PV panel and a storage system. The function of the PV is to generate electricity and the storage systems are used when you aren’t using all the solar energy generated. In other words, the system stores the electricity for later use.
The storage system will consist of batteries which are placed in a vented room such as a basement. You don’t need to have batteries but they’re recommended for those who want to be completely independent in terms of energy production. Batteries will allow you to do this and they’re the most common way of storing solar energy.
Although batteries are typically used for solar energy storage, there are also two main types to choose from. These are lead acid and nickel cadmium.
Due to their low cost, you will find that lead acid batteries are the most common when storing solar energy. They’re very similar to the type of battery you have in a car. The terminals are positive and negative and they have leads attached to them which contain metal plates that in turn connect to terminals. These plates sit in a solution of sulphuric acid. When there is a reaction between the lead plates and the sulphuric acid you will find that this is how electricity is produced.
This is pretty much how a nickel cadmium battery work too however these batteries are a lot more expensive. The benefit of paying more for these batteries is that they function much better. Not only to the discharge more electric current before they require recharging but they also last a lot longer than lead acid batteries.
Because of the way solar panels work the battery will charge up when the solar panels are not getting any light. This is why they’re so important so that you can still run electrical devices in your home no matter what amount of light is currently hitting the solar panels.
The problem with batteries is that they can become drained or can be overcharged too many times. This why charge controllers are used as they stop this from happening. If the batteries become fully charged the controller prevents any more charging from happening. You will find that lead acid batteries are meant to be discharged at about 50% of their capacity allowing you to extend its life.
Solar panels normally last for about 20 years but batteries only last for about half that time. This is why it’s so important that you understand you need to factor this into the cost of your solar system. Replacing your batteries can be fairly costly and shouldn’t be ignored when making your solar purchase.
Q: how to measure the effects of active and passive solar energy systems?
A: I think the following articles have provided a clear indication of active and passive energy systems. By reading these, I can assure you can understand how to measure the active and passive solar energy systems.
http://www.esru.strath.ac.uk/EandE/Web_sites/01-02/RE_info/active_solar.htm
http://www.azsolarcenter.com/arizona/modules/passive.html
http://en.wikipedia.org/wiki/Passive_solar_heating
http://www.ces.purdue.edu/extmedia/AE/AE-99.html
Q: does anyone know how i can measure the effects of active and passive solar energy systems??
thankz for helping!
A: what effect?
Q: Can someone help me understand this statement about Solar Energy?
So I’m reading this article on Wikipedia about Solar Energy. I have to do this project about biofuels, and solar energy is one of them. It says:
“Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight. Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun. Active solar technologies increase the supply of energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate resources and are generally considered demand side technologies.”
I don’t understand what they mean. Do active thinger-majiggers move toward the sun, and passive ones just sit there and absorb the sunlight?
http://en.wikipedia.org/wiki/Solar_energy#Energy_from_the_Sun
A: I think the difference between “active” and “passive” technologies is this:
Active technologies convert solar energy into useful energy like electricity or heat energy (or hot water) that can be used to heat or light a building etc. WHEREAS passive technologies try to minimise the need for energy to heat, light or cool a building by using clever design in the building itself.
Examples of passive technologies would be window shades to keep rooms cool, or plenty of South-facing windows to keep rooms warm in winter.
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