The Clean Energy Blog

Useful & Relevant Info On Renewable Energy

Jun

17

Save Energy and Fuel: Begin in your Home

Posted By: Freddy on June 17, 2009 at 12:19 am

Energy is not something that is cheap like it was in years past. In fact, energy is very expensive, whether it’s in the form or fuel for our home or fuel in our gas tank.

Everywhere we go we’re hearing about ways to become more energy efficient so we can be saving money on fuel prices. The high cost of fuel for our homes and cars is almost driving some to bankruptcy.

Although there is no way to totally eliminate most of these expenses, saving money on fuel prices, which are at an all time high now, is possible in our home and car.

Some items in our home that may use some type of fuel are our furnace, cook stove, washing machine and hot water heater. Next to our furnace, the appliance that consumes the most fuel and energy usage is the hot water heater. The hot water heater is used for washing dishes, taking showers and doing laundry. If you are part of a large family, specially with growing children, you know the hot showers and dirty laundry seem to go on with no end.

Attempting a plan where saving money on fuel prices is a possibility is the only choice for many families.

Your hot water heater may be the first place to start this plan. If you’re purchasing a hot water heater, don’t grab the first hot water heater you see just because it’s the cheapest. Although most new hot water heaters are energy efficient and will help with saving money on fuel prices, some are more efficient than others.

Don’t put yourself in a position where you’re paying hundreds of dollars more each year than you need to be paying just because your hot water heater is inefficient. If you’re really serious about saving money on fuel prices, make sure you buy an efficient hot water heater.

Here are some tips on the most important things to look for when buying a hot water heater:

  • Energy efficient hot water heaters come in many different sizes so make sure you buy the size you need to meet the needs of your family. It’s not unusual for a family of five to use 100 gallons of hot water daily.
  • Make sure the hot water heater you buy has a low radiant heat loss rating. A rating of 15 or less is good. The radiant heat passes from the hot water heater to the environment outside of the heater instead of going back in the water.
  • Make sure your new hot water heater has a low cycling loss, which is the amount of heat that is lost as it goes throughout your home. The lower the number the better its efficiency.
  • Consider buying a tankless heater. Although it is a lot more expensive to buy and install, it can be up to 30 percent cheaper to run. The money you save will add up.
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    Jun

    15

    Sizing a Home Made Wind Power System

    Posted By: Freddy on June 15, 2009 at 12:12 am

    To size a wind power renewable energy system, you first have to determine your energy budget.

    In order to complete an energy budget you will need to know how much power typical appliances use. What follows is a chart to help you.

    AC Appliances Typical Energy Usage in Watts

    Toaster Oven 1500
    VCR 35
    Well Pump 800
    Sewing Machine 87
    Satellite TV 50
    Refrigerator/freezer 460
    Vacuum 1125
    Circular Saw 1500
    Hair Dryer 1500
    Jigsaw 300
    Computer 100
    Laptop 60
    Monitor 60
    27” TV 200
    DVD 14
    Drill 800
    Microwave oven 1245
    Compact fluorescent 13
    Battery Charger 25
    Blender/mixer 350
    Belt Sander 800
    DC Appliance Energy Usage
    Appliance Watts
    Cell Phone 4
    Motor (small) 65
    Sunfrost refrigerator 13
    Radio 15
    Stereo 30
    Water Pump 50
    VCR 15
    14” Color TV 75
    Battery Charger 7
    Inverter Standby 5
    Halogen Light 20

    Now that you know how much energy your appliances use you can figure out your total energy usage per week, and per month.

    In order to do this, simply figure out how many hours each device is used each day. Multiply this number by the number of watts that device uses and you will come up with the watt-hours of usage. Add all of the totals together to come up with your total watt-hours of usage for the week, and for the month.

    Keep these numbers with your notes; you will use them to design your charging capacity, battery bank and inverter sizing.

    Figuring out your own energy usage

    Take the numbers you got from your own appliances or use the numbers we provided and work out your own energy budget.

    Example:

    Appliance Rated Wattage (A) Hours Used per day (B) Watt-Hours
    (A) x (B) per day
    Satellite TV 50 5 250
    Computer 100 5 500
    Laptop 60 5 300
    Stereo 30 2 60
    Fuorescent light 13 10 130

    Add as many items as it takes to complete your inventory. It should be noted that most households use approximately 20 Kilowatt hours per day on average.

    Your new wind-powered renewable energy system would have to be very large to compensate for this high level of usage. A typical home made wind generator is only going to produce about 1 Kilowatt (1000 watts) of power. This is a wind turbine with blades 4 feet long, making a blade outside diameter of 8 feet.

    Through conservation and buying newer more energy efficient appliances you can achieve the goal of living off the grid. It just takes some time and effort on your part. You can live on a total family usage of about 2 or 3 Kilowatt-hour per day and live a relatively normal life, with satellite TV, satellite internet, DVD’s, lights etc. It can be done.

    Some questions answered

    Once I know how much power I will need to run my home, how will I figure out how much power production I need?

    Answer: You figured out how much power you use in the earlier exercise. You should be aiming for around 10 kilowatt hours per day. You could actually run your entire home on just under 3 kilowatt hours per day with energy conservation measures

    The power formula goes like this:

    System Power = (Wind Speed ^3) (Blade Diameter ^2) x .00478

    Wind Speed is measured in miles per hour.

    Blade Diameter is measured in feet.

    Power is measured in Watts

    It is easy to figure out your blade diameter. A widely used 8 foot blade diameter has been proved with great success.

    To find your wind speed you will have to find a wind speed chart, or monitor your own wind speed for a while to obtain your own readings.

    Here is a source of wind speed data.

    World Wind Speed Data Maps

    Let’s say your average wind speed is about 12 mph, which is pretty good. Plug that into your formula too. It would look something like this:

    System Power = (12^3) (8^2) x .00478 = (1728) (64 ) x .00478
    = 110592 x .00478 = 528 watts

    Multiply this by 24 hours and you will have 12672 watt-hours, or about 1.2 kilowatt hours per day.

    Wind speed has the greatest impact on power output since it is cubed in the previous formula. You can’t change wind speed though. You either have it or you don’t.

    This brings up our next question.

    Should I build one large wind generator, or several small ones?

    Answer: Obviously blade diameter can have a huge impact on the amount of power that your homemade wind generator produces. There are a few concerns though. Yes, you could put up a homemade wind generator with a 20 foot blade diameter, but the forces of the wind at storm levels would demand a very substantial tower. Also, if you live in a populated area your neighbor might not appreciate a huge wind generator in your backyard. Ask first.

    Some areas even have bylaws about this stuff, do some research first and find out what you can and cannot do.

    Usually it is much easier to find towers for several smaller wind generators and parts to build them too. If you have areas on your property that are clear in different directions, put up several homemade wind generators to capture the wind more effectively from different directions with much smaller towers.

    One final thing, when you have several homemade wind generators you can shut one down for cleaning or maintenance (or if a storm does this for you) and your other ones are still providing power.

    A lot less work in the long run, and less headaches with a smaller system.

    Get the full scoop on How to Build Your Own Home Made Wind Generator

        Filed Under: Alternative Energy Sources , Wind Power Tagged with , , , , , , , , , , , , , , , , , , , , ,
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