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- Type of energy transformations that take place in harnessing the solar energy.
- efficiency of the (solar) energy transformations
- The amount of energy obtained from solar energy?

Thank you !

I’ve been studying and pursuing solar energy advantages for more than a year now.

I am happy, no, thrilled with the obvious pursuit of renewable energy sources by federal and local governments as well as everyday citizens.

But I want information I can act on.

For the past year, August 2008 to August 2009, we have taken every actionable idea our home budget allowed.

This action steps centered on energy conservation measures. Indeed, energy conservation is the place to start.

The good news is that we reduced our home energy bill by 22.7 percent, a savings of almost $500 over the course of the year by practicing energy conservation measures only.

Really, if each of us practiced energy conservation only, a huge difference would be evident on our collective carbon footprint!

With all the conservation measures in place, the next steps are energy efficiency measures. These are the measures that cost a little bit of money—energy efficient windows, more home insulation, energy efficient heating/cooling systems, energy efficient appliances.

However, right now, I have no funds to take action on these efficiency items.

Sigh.

What’s a person on a tight budget to do?

Summer Energy Efficient Windows  — Part 8

It’s summer now here in South Texas. Those energy efficient windows are calling my name!

The solar energy coming our way brings heat and lots of it. The aim of energy efficient windows is to keep that solar thermal energy at bay!the cost may be prohibitive, even with energy tax incentives attached.

For those who grapple with fixed incomes and rigid budgets, it still comes down to basic economic factors. Replacing windows solely for saving the energy bill is not often a cost-effective measure. See replacing windows at the Energy Star site.

So if the economic factor is your prime motivator, you can make your existing windows more efficient by using a few other methods:

·    Cellular shades

·    Curtain panels with interlinings

·    Window films

·    Solar screens

·    Cover your windows during the sunniest times of day

But if you need to replace your windows for other reasons, maintenance perhaps, or you just want nicer windows, make it an occasion to provide your home for comfort and energy cost savings.

Summer Energy Efficient Windows – Part 7

After you figure out the best energy efficient window for your home in your climate, this is a good year to make the purchase.

According to energystar.gov, energy-efficient windows purchased this year, 2009, could be eligible for a federal tax credit.

Do your homework! Not all Energy Star products qualify for tax credits! Make sure BEFORE you make your window purchase.

If you qualify, your tax credit would apply to your 2010 tax return. That federal tax credit would help offset the cost of your windows.

Please note…

Tax credits are limited to the amount of federal tax you owe the government. They are not refunds of money.

Summer Energy Efficient Windows – Part 6

Window choices get complicated:
·    U-factor
·    Solar heat gain coefficient
·    Visible transmittance
·    Air leakage
·    Condensation resistance

Then there’s the climate issue! Homes in the Northeast need different windows than homes in the desert Southwest.

Trying to do your best at efficiency and economy could easily seem to require another college degree!

Could someone just TELL me which window I need?

Glad you asked.

The Department of Energy and the United States Environmental Protection Agency do all the testing and analyzing and rate windows according to their effectiveness.

The simplified version of window data analysis is found in an Energy Start label.

An Energy Star labeled window receives high marks for u-factor and solar heat gain coefficient.

And to find the best window for your climate check out energystar.gov.

Summer Energy Efficient Windows – Part 5

There’s a huge learning curve to energy efficient window expertise.

Not that one requires “expertise” in window manufacturing to purchase the best windows. However, you do need a certain knowledge base in order to get the right window for your particular needs.

You can’t just go to a window store and pick a pretty window any more than you go to the shoe store, and simply pick out a pretty shoe.

Windows, like shoes, must be matched to the wearer.

The search for the best energy efficient window is still on.

“Condensation resistance” is another feature to look for while you are reading those window labels.

Condensation resistance measures a window’s ability to resist condensation or water buildup; the higher the number between 0 and 100, the better. Higher numbers indicate a product’s ability to resist condensation.

Note: Rating a window for condensation resistance is optional; window manufacturers can choose not to include this rating in on their labels.

Summer Energy Efficient Windows – Part 4

Did you know that air can pass through windows? Solar energy can heat up our Texas air to egg frying temperatures during the summer months. And that hot air can come into our homes!

No window keeps all air out. Air seeps through around window joints and assembly. Really, that’s a pretty good thing; we all need to breathe.

But some windows let less air inside than others.

Windows have an “air leakage” rating. This value measures cubic feet of air passing through one square foot of window area per minute.

The lower this value, the less air passes through the assembly, the better it is for your electric bill. Look for a rating of .3 or less.

Window selection is more complicated that I first thought!

More next time.

Summer Energy Efficient Windows – Part3

In the final months or my energy conservation mode, I’m beginning to gear up for the next step – Energy Efficiency. My study now revolves around windows for summer energy efficiency.

Today’s window performance rating element is visible transmittance (VT).

Visible transmittance tells you the amount of light a window allows though. Efficient windows are energy savers and will reduce my energy bill, but I still need the daylight shining into my house to keep my inside plants alive and to keep my sanity!

The visible transmittance (VT) is measured on a scale of 0 to 1. Usual values are between 0.3 and 0.8.

The higher the visible transmittance (VT) rating on the window, the more light passes inside. So for the greatest amount of daylight and to enjoy the view from your windows, the visible transmittance (VT) rating the better.

But there is a trade-off. You see, lower the VT number, the better a window insulates. To get maximum daylight transmitted inside, I lose insulating capacity.

Hmmm…I’ll have to think about this more. Perhaps some of my windows need more insulting that others.

Summer Energy Efficient Windows – Part 2

I love windows.

They allow light into an otherwise dark spaces. They provide restful views of the green outdoors when work requires you to be indoors. They allow clean air to circulate and freshen up your living spaces.

On the other hand, windows usher summer heat inside to compete with your air conditioning.

So if you are in the market for more energy efficient widows it’s time to do some homework.

Last time I posted about the U-factor.

Next, check the solar heat gain coefficient. This number measures how well windows block heat from the sun. The coefficient is a number between 0 and 1. A low number is what you want. Usually, you want a number from .25 to .8. Lower numbers indicate better heat blocking capacity.

Next time you’re in your local home improvement store, check out their window selections and locate  the solar heat gain coefficient.