Solar thermal panels are rated with efficiencies ranging from 50% to 78%, producing about 1000 BTUs per square foot per day - or 290 Watt-Hours per day per square foot. Electric solar panels have efficiencies ranging from 11%-15% and produce about 12 watts per square foot - or 72 Watt-Hours per day per square foot. Also, electric panels typically cost more than thermal panels. For the same financial investment, a thermal system produces 5 times more energy than an electric system.

an approximate rule of thumb one 2.5sq mtr flat panel collector will provide nearly 1000kWh of free energy per year. In the summer months the panels can produce temperatures of well over 100 degrees C, depending on circulation flow rates See similar questions...

Yes. According to an article published by the national renewable Energy Laboratory (NREL) today's solar panels will produce as much energy as it takes to make them in about four years. See similar questions...

Eye Saver is efficient because it controls light from escaping through the top of the bulb, thereby directing more light (than a standard incandescent bulb of similar wattage) onto the work surface. (back to top) Eye Saver gives off the same amount of heat as a conventional incandescent bulb of similar wattage. (back to top) See similar questions...

The performance of a photovoltaic array is dependent upon sunlight. Climate conditions (e.g., clouds, fog) have an effect on the amount of solar energy received by a PV array and, in turn, its performance. Most current technology crystalline photovoltaic modules are about 12 to 13 percent efficient in converting sunlight into electricity. Some modules provide as much as 20 to 21 percent efficiency. Further research is being conducted to raise this efficiency to 23+ percent. See similar questions...

This is by far the most asked question and the most difficult to answer. There are just too many variables. A simple rectangular home without many interior log walls would be considerably less per square foot for a similar size home with interior log walls, additional corners, stairs and handrails, etc. See similar questions...

A square is an area of 100 square feet. This, however, is not coverage square feet. Many years ago, the industry elected to calculate these 100 square feet on the total out-to-out width of the panel. For example, a 3' coverage, screw-down panel is figured to be 3.19 feet wide. Other panels, such as standing seam or architectural types figure squares by actual coverage of the panels. Hey, we didn't write the rules, we just follow them! See similar questions...

this time, we do not have solar panels that store energy for use at night or during cloudy conditions. We are, however, working constantly at getting high quality solar products to increase our selection. We are aware that this is an in-demand item and hope to have them available very soon. Please check back with us. For more information about Solar Fountains, please visit the About Solar Fountains section of our Buyer's Guide. See similar questions...

Absolutely! NexGen's patented interlocking flange creates ultra strong joints that are impervious to air infiltration. When a sprayed application of polyurethane insulation is used, an R-Value in excess of 12 is achieved! See similar questions...

Buy one with an ENERGY STAR® Label. ENERGY STAR® Homes are designed to use at least 30 percent less energy than required by the national Model Energy Code. To achieve ENERGY STAR® status, a home must be validated by a Home Energy Rater - a certified, third party inspector who audits and tests the home. Home buyers can also save money on their mortgages. ENERGY STAR® Mortgages give home buyers easier access to preferred financing. See similar questions...

This is mainly about avoiding heat loss (see above), but you can add heat exchangers (with appropriate filters to prevent them getting clogged up) for added efficiency. These take a high proportion of the heat from discarded air and use it to warm the new fresh air supply. Venue operators have a duty of care to workers under Health and Safety regulations. A casino worker recently won an out-of-court settlement of around £50,000. See similar questions...

Depending on the available sun shine the ecological payback is less then two years. Typical conversion rates of solar modules are 12 to 15%, meaning that 15% of the energy that falls onto the module’s surface area is converted into DC power. Even at 12% the overall energy generated by the cells over the expected life span of 50 years is a tiny fraction of the energy used to build all components of the system. See similar questions...

Equals a square 12 inches on each side and can be any thickness. It is typically used to measure engineered panel products that are less than 1" thick, including plywood, particleboard, medium density fiberboard and oriented strand board. See similar questions...

The array size you need depends on your average electrical usage, climate, roof angle, shading problems and many other factors. To approximate the array size you need, multiply your average daily electrical demand in kilowatt-hours by 0.25. The result is the approximate size of solar array, in kilowatts, needed to meet your electrical demand. See similar questions...

It is always best to be energy efficient, but if not, it is still best to use radiant because you will use less energy and spend less money. You may need a supplemental heat source on very cold days, but radiant heating is the only way to be truly comfortable in a room that is not energy efficient. See similar questions...

The estimated sq. footage is approximately 1,200 sq. ft. Both Villas include 2 bathrooms, 2 bedrooms, living room, den, dining room, a fully equipped kitchen, and a patio with barbeque & ocean views. See similar questions...

Every project is different. In order to generate your quote, many factors need to be taken into account. However, by contacting our friendly technical team we can quickly provide you with a detailed estimate. See similar questions...

No. Every project is different with the prices varying according to project type, medium, difficulty of installation, etc. We encourage you to call for pricing information. You can not put a square foot price on art. It is not wall or floor covering. It is for the most part a permanent fixture that expresses not only the personality of the artist but of the owners for which it was designed. We can provide estimates, but only after we have the answers to certain questions. See similar questions...

Pricing houses by the square foot is like pricing cars by the pound. It is not a good measurement of “what you get,” and usually is not a guarantee of anything. Because we are a custom homebuilder and serve a wide geographical region, we do not price our houses by the square foot. Your cost per square foot will vary largely based on three factors: The total square footage (larger homes = lower cost per square foot) and the features you design into your home. See similar questions...