Radiant Heat Floor Basics

December 14th, 2011 No comments »

Radiant heating systems involve supplying heat directly to the floor or to panels in the wall of a home. The systems depend largely on radiant heat transfer; the delivery of heat directly from a hot surface to the people and objects in the room via the radiation of heat, which is also called infrared radiation. Radiant heating occurs when you can feel the warmth of a hot stovetop element from across the room. When radiant heating is located in the floor, it is often called radiant floor heating or simply floor heating.

Radiant heating has a number of advantages. It is more efficient than baseboard heating and usually more efficient than forced-air heating because no energy is lost through ducts. The lack of moving air can also be advantageous to people with severe allergies.

Hydronic (liquid-based) systems use little electricity, which is a benefit for homes off the power grid or in areas with high electricity prices. The hydronic systems can be heated with a wide variety of energy sources, including solar thermal hot water panels, standard gas- or oil-fired boilers, wood-fired boilers, or some combination of these heat sources.

Despite their name, radiant floor heating systems also depend heavily on convection – the natural circulation of heat within a room – caused by heat rising from the floor. Radiant floor heating systems are significantly different than the radiant panels used in walls and ceilings.

Description of Radiant Heat floors

The type of installation that is required can further subdivide all three types: those that make use of the large thermal mass of a concrete slab floor or lightweight concrete over a wooden subfloor (these are called “wet installations”), and those in which the installer “sandwiches” the radiant floor tubing between two layers of plywood, or attaches the tubing under the finished floor or subfloor (“dry installations”).

Hydronic Radiant Floors

Hydronic (liquid) systems are the most popular and cost-effective radiant heating systems for heating-dominated climates. Hydronic radiant floor systems pump heated water from a boiler and /or solar system through tubing laid in a pattern underneath the floor. In most Eco Depot USA systems, the temperature in each room is controlled by regulating the flow of hot water through each tubing loop. This is done by a system of zoning valves or pumps and thermostats. The cost of installing a hydronic radiant floor varies by location and also depends on the size of the home, the type of installation, the floor covering, and remoteness of the site.

Air-Heated Radiant Floors

Because air cannot hold large amounts of heat, radiant air floors are not cost-effective in residential applications, and are seldom installed. Although they can be combined with solar air heating systems, those systems suffer from the obvious drawback of only being available in the daytime, when heating loads are generally lower. Because of the inefficiency of trying to heat a home with a conventional furnace by pumping air through the floors, the benefits of using solar heat during the day are outweighed by the disadvantages of using the conventional system at night. Although some early solar air heating systems used rocks as a heat-storage medium, this approach is not recommended.

Electric Radiant Floors

Electric radiant floors typically consist of electric cables built into the floor. Systems that feature mats of electrically conductive plastic are also available, and are mounted onto the subfloor below a floor covering such as tile.

Because of the relatively high cost of electricity, electric radiant floors are usually only cost-effective if they include a significant thermal mass, such as a thick concrete floor, and your electric utility company offers time-of-use rates. Time-of-use rates allow you to “charge” the concrete floor with heat during off-peak hours (approximately 9 p.m. to 6 a.m.). If the floor’s thermal mass is large enough, the heat stored in it will keep the house comfortable for eight to ten hours, without any further electrical input. (This saves a considerable number of energy dollars compared to heating at peak electric rates during the day.)

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First Steps to Solar: Gathering Site Data

October 26th, 2011 No comments »

The first step in stetting up a photovoltaic system is to determine what time of the year will have the largest loads (loads are defined here) and then to select a month that you will use to design the system. You will also need to gather solar insolation data (insolation defined) for the sizing calculations.
Determining Design Month
Insolation data is most often presented as an average daily value for each month. When sizing a system, it is important to use the correct month. If the load is constant throughout the year, the design month will be the month with the lowest insolation. The array should then be installed with a tilt angle that yields the highest value of insolation during that month. This ensures that the system is designed to meet the load and keep the battery fully charged in the worst month for the average year.
If your load is variable for each month you will need a sizing worksheet. (Contact Eco Depot USA and we will send a pdf.) The design current is the average daily load for the month divided by the monthly insolation. The month corresponding to the largest design current should be used as the design month.
Source: Solar Energy Internationl’s Photovoltaics Design and Installation Manual. Page 33. This is the book used to train the pro’s. Learn more at www.solarenergy.org.

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Xcel Rebate Update

October 12th, 2011 No comments »

Xcel Rebates have just dropped to $1.00 a watt and $.09 a kWH REC payment.
If you are interested in installing a grid-tied PV system and are an Xcel customer, call us today!
And remember
Eco Depot USA can carry the rebate reducing your upfront cost!

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Rebates, Resources & the Relevant News Colorado’s Net Metering Explained

October 12th, 2011 No comments »

For Colorado’s net-metering rules, any customer net excess generation (NEG) in a given month is applied as a kilowatt-hour (kWh) credit to the customer’s next bill.
If in a calendar year a customer’s generation exceeds consumption, the utility must reimburse the customer for the excess generation at the utility’s average hourly incremental cost for the prior 12-month period.  
If a customer-generator does not own a single bi-directional meter, then the utility must provide one free of charge. Systems over 10 kilowatts (kW) in capacity require a second meter to measure the output for the counting of renewable-energy credits (RECs).
 Customers accepting IOU incentive payments must surrender all renewable energy credits (RECs) for the next 20 years. Cooperative and municipal utilities are free to develop their own incentive programs at their discretion but they are not subject to the solar set-aside.

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CU’s Solar Carport Installed by Eco Depot USA

October 12th, 2011 No comments »

Driving into Boulder on Highway 36, you may see a new structure welcoming you to the University of Colorado Boulder. CU-Boulder is currently installing a carport with 100 kW of solar PV panels on top. This installation is happening just west of the Bear Creek Apartment Complex, and will produce approximately 145,000 kWh/year electricity, or enough to power about 20 regular sized
homes.
Traditionally projects are paid for by grants, campus budgets, or gifts from donors. This project breaks these norms by taking advantage of all renewable energy rebates, tax credits and accelerated depreciation write off. The 3rd party financing, design and construction company is Eco Depot USA.
“ The university is not a tax entity, if we would have done this project on our own, we would have left a significant amount of tax credits and incentives on the table,” said Moe Tabrizi, director of sustainability. In addition to the incentives provided, CU-Boulder will have the opportunity to buy the solar installations at the end of seven years at a fraction of the cost. This renewable and green energy production is in conjunction with the development of a new 500 bed residence hall, which will likely be the campuses first LEED Platinum rated building. The new residence hall, Williams Village North, also boasts sustainable features such as, solar heated water, native landscaping, regional and recycled content building materials, and much more. Once the building is certified, it will also likely be the first LEED Platinum residence hall of its size in the nation.
CU-Boulder isn’t stopping here. Projects on main campus are under way to continue putting Solar PV on available rooftops and awnings. This unique location is the first time many visitors can actually see the solar PV and serves as a perfect welcome to the sustainability focused campus.
Source: http://parents.colorado.edu/blog/2011/06/solar-pv-carport-being-installed-at-bear-creek-apartments/

http://www.dailycamera.com/cu-news/ci_18443809

Photo @ Left: Boulder Daily Camera

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Zero Down Solar Lease Comes to Southern Colorado

February 1st, 2011 2 comments »

Solar energy is coming to Xcel Energy customers in a whole new way for homeowners looking to save money on their electricity bills. Today, getting a solar power system for the home is just about as easy as purchasing a book on Amazon, and is more affordable than ever before. Sungevity, the California-based company that’s behind the national campaign to get solar on the White House, has “virtually” arrived in (Pick one – Chaffee, Lake, Summit and Saguache, Conejos & Alamosa County ) to roll-out its one-of-a-kind online solar home solution.

The online approach is an ideal way for people who are thinking about – but never wanted to be hassled with – the planning of a solar home solution. Sungevity makes it as easy as a click-of-the-mouse to secure the best lease for solar energy in the market.

In three easy steps, homeowners can log onto Sungevity.com, receive a firm “iQuote,” see what the solar panels will look like on their roof using a mash-up of satellite and aerial imagery, sign a contract using electronic signatures and schedule an installation – all paid for with a no-money-down lease.

By using solar energy, Sungevity estimates that most homeowners can save 15 percent off their electricity bills from day one and have a new residential solar panel system on their roofs, and qualified buyers for 0 down, giving owners the satisfaction of using clean energy and saving money to boot.

Sungevity pioneered the ability to accurately engineer and design a solar system for the home without making a site visit. The Sungevity approach uses satellite and aerial photos to size and design the solar system within 24 hours. Solar consultants from Sungevity are available to speak to potential customers from 9 a.m. – 9 p.m. PST, seven days a week, toll-free at 866.SUN4ALL. Finally, local contractor Eco Depot USA has has partnered with Sungevity to then perform the installation.

“The time is right to bring the simple, pain-free approach to getting a solar solution for your home,” said Eco Depot USA Founder, Curtis Scheib. “The online approach is an ideal way for people who are thinking about – but never wanted to be hassled with – the planning of a solar home solution. Sungevity makes it as easy as a click-of-the-mouse to secure the best lease for solar energy in the market.”

Sungevity processes all the paperwork and takes all the hassle out of going solar, with an operating lease that includes a performance guarantee for the system plus complete maintenance including cleaning and insurance.

About Sungevity:

Sungevity (www.sungevity.com) is the leading online residential solar company and uses the power of the Internet to help homeowners start powering their homes with clean energy. The company is the first to take the hassle out of researching, planning and installing a solar panel system by allowing consumers to place their order in the same way they would plan a vacation or purchase a set of golf clubs: online. With satellite imagery perfectly capturing rooftops, who needs a site visit to plan a system and deliver a quote?

With the Sungevity Solar Lease homeowners likely save 15 percent or more on their electricity bills from day one and the savings grow each year. Gone are the days of spending thousands of dollars to install a home system. Today, qualified consumers can pay zero money down and a low monthly payment to lease a system from Sungevity for 20 years, with the option of extending that lease for an additional 5 years at lease-end. With a Sungevity Solar Lease, all maintenance, monitoring, cleaning, and insurance is taken care of.

Sungevity has designed a unique online sales process to make it easy and affordable for homeowners to go solar. Sungevity’s Solar Lease offer gives most customers savings from the start. For most the electricity bill savings start immediately and increase over time. Sungevity has an easy online “iQuote” process, which enables Sungevity to furnish customers with a firm proposal to use solar power with no capital cost within 24 hours.    http://www.sungevity.com/get-your-iquote?referral-code=ecodepot

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SOS: Schools on Solar

October 14th, 2010 No comments »
School Solar Systems: Renewable Energy World Logo

Read the full article here or RenewableEnergyWorld.com

Original article by Preston Roper, Tioga Energy
Some paraphrasing by Mike Brown, Eco Depot USA

There is an SOS coming from communities across the nation: Save Our Schools. With the rise of new financing tools like power purchase agreements (PPAs)and the right support from the public and politicians, we believe we have an answer: Schools On Solar.

Schools nationwide are in dire fiscal straits and have been forced to make hard financial decisions to stay afloat — usually by shutting down an increasingly comprehensive list of classes, skimping on materials and shutting down operations.

We believe that solar power options like PPAs can recharge our ailing schools and not only save them money, but also help plan regular, measured payments that put resources and financial support back into schools’ hands.

Traditionally, implementing solar systems at educational facilities presents a laundry list of problems: many public schools don’t have the available resources to make use of capital budgets, can’t gain the support for bond measures including solar systems or can’t run a buying process on existing staffing and budgets in order to purchase and maintain a solar installation. RFP management, architectural design and proper evaluation of alternative energy paths are time-consuming and expensive, making it difficult to go solar. The costs and efforts of system maintenance and monitoring — combined with uncertainty around system generation — further complicate the process.

These contributing factors all cause administrators and facility managers to be initially cautious and slow to move on investments like solar energy.

But we have found that these same administrators are financially creative people who understand the financial benefits of solar. And they want to see progress. Their bottom line is often that solar companies have to deliver more than an environmentally-friendly project. They have to be financially sound and save the district money from day one.

Enter PPAs

PPAs can help schools precisely predict what their power costs can be — through fixed cost energy pricing — so they can better gage spending that might otherwise go to increased electricity costs.

Under the proper utility tariff and utilizing the available tax and rebate incentives, PPA providers can offer schools a rate of power that’s competitive with existing utility rates. Meanwhile, PPA providers handle the outsourcing of contractors and financing, removing extra labor on their behalf.

New options like PPAs make for a strong start.

For more infromation contact:

Mike Brown, Eco Depot USA
mbrown@ecodepotusa.com

www.ecodepotusa.com

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Treasury’s Renewable Energy Grant Program Set To Expire At Year’s End

October 14th, 2010 1 comment »

An article by Rachel Z. Azoff for Multifamily Executive magazine which is devoted to News and business strategies for apartment and condo owners, managers, and developers reminds us that time is running out for green energy funding.

It’s important for us to note that this applies to individual home owners as well.

Green experts recommend taking advantage of the green funding source before it’s too late.

Time is quickly running out to use a powerful federal incentive aimed at greening commercial properties.

The Department of Treasury’s Section 1603 federal renewable energy grant program, enacted as part of the American Recovery and Reinvestment Act of 2009, is scheduled to expire at the end of the year. To take advantage of the program, developers must either break ground on a project by December 31, 2010, or incur 5 percent of the total project cost by the end of the year and complete the building by the end of 2011. The grant applies to both new construction and retrofits and can go towards a variety of sustainable technologies including solar, fuel cells, wind turbines, and geothermal heat pumps.

“The grant has been a tremendous success, helping with the adoption and investment of solar technology at a time when the market for tax credits and overall demand for capital improvements has been down,” says Mike Hall, CEO of Borrego Solar Systems, a San Diego-based solar installer. “If there’s a project that developers are contemplating or in the planning stages on and need [this] grant in order for it work, they need to accelerate the [development] time line.”

While there is a slim chance that the grant program could be extended, Hall warns developers not to count on it. “There seems to be some political will to extend the program, but it hasn’t happened yet.”

Complete article here (although this was all the important stuff)

For more information contact:

Mike Brown, Eco Depot USA
mbrown@ecodepotusa.com

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Google Continues Green Commitment

July 22nd, 2010 No comments »

Image from blog.enterpriseitplanet.com

An article from Information Week starts out, “Continuing its efforts to implement socially responsible technology, Google on Tuesday said that its Google Energy subsidiary had completed a 20-year Power Purchase Agreement with NextEra Energy Resources to buy clean power.”

It talks about how the commitment to purchase wind power enables the energy producer. “By contracting to purchase so much energy for so long, we’re giving the developer of the wind farm financial certainty to build additional clean energy projects,” he said in a blog post. “The inability of renewable energy developers to obtain financing has been a significant inhibitor to the expansion of renewable energy.”

Regardless of the motivation behind Google’s commitment to be carbon neutral, good on ‘em.

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Nonprofits find ways to pay for renewable energy

May 6th, 2010 6 comments »

DENVER

By CATHERINE TSAI

The Upper Scioto Valley School District in Ohio, battered by a slowdown at a nearby Ford Motor Co. plant, wanted to explore alternative energy when it developed a plan to fix its budget and create jobs.

It had a square mile of land where it could put wind turbines and tap some of the best wind resources in the state. It just needed the money.

That’s where Boulder, Colo.-based NexGen Energy Partners came in.

NexGen builds and maintains onsite wind and solar systems for customers, sparing them construction and maintenance costs. Using renewable energy grants and credits to defray its costs, it makes money selling power to customers over long-term contracts.

NexGen erected two 100-kilowatt turbines for Upper Scioto Valley schools, which paid $35,000 in upfront costs for some of the power and an engineering fee, Assistant Superintendent Jim Bowser said. The district projects the turbines will save it about $1.7 million over 15 years on utility bills.

“Are we breaking even? You bet. And we’re making money,” Bowser said.

The district is looking at adding more turbines, a solar power system, and possibly turning biomass into energy with other corporate partners.

Having someone else build a renewable energy system and buying just the power is becoming more common for nonprofits, businesses and local governments and agencies looking to switch to wind or solar. The model makes the most sense when customers own the properties where equipment is installed, where they pay high utility rates for conventional power, and when projects can qualify for incentives or tax credits.

Schools and other government entities don’t qualify for tax credits, but 14 states allow third parties that aren’t a regulated utility to sell power, according to the Database of State Incentives for Renewable Energy, or DSIRE. Those third parties often qualify.

“It’s the only way government incentives can effectively be used,” said MP2 Capital CEO Mark Lerdal. The San Francisco-based solar project developer has a power purchase agreement with the city-owned Denver International Airport, where it owns and operates a new solar power system.

There are other options for minimizing upfront costs. Eighteen states allow loan programs where homeowners or businesses pay off the costs of a solar project over time through a special assessment on property, according to DSIRE.

“It’s really interesting to see how much innovation is happening in the clean energy space in terms of financing,” said Karlynn Cory, the renewable energy finance team lead at the National Renewable Energy Laboratory in Golden, Colo. “It’s helping to accelerate the pace of development.”

The key for NexGen is finding projects where it can build on site, with no need for complex transmission systems to deliver power.

“If we can deliver energy on site, whether it’s a school, college or small town, all that infrastructure is already in place. We just have to bring in the actual equipment. We don’t have to build tens of millions of lines,” said NexGen President John Brown, formerly of NREL.

The private company, founded in 2007, doesn’t reveal its finances but said it was profitable last year and is on track to make a profit this year. It has about two dozen customers in Ohio, California, Kansas and Hawaii, said Ted Rose, vice president of business development and public affairs.

Partners invested $20 million in NexGen last year and could invest about $30 million this year, Brown said.

For years, Eldorado Artesian Springs Inc. in Louisville, Colo., wanted to add renewable energy, but paying about $400,000 to install its own solar panels was never an option, Chief Financial Officer Cathy Shoenfeld said.

NexGen has provided Eldorado with solar panels that should generate close to half of the bottled water company’s electricity needs. Under a multiyear contract, NexGen will sell the power to the company at rates comparable to what the utility Xcel Energy charges. (Xcel also generates some of its power from renewable sources.)

“It’s not going to cost us any more than what we would pay for power from Xcel,” Shoenfeld said. “In a situation like this, there’s really not a lot of risk.”

Links:

http://www.businessweek.com/ap/financialnews/D9FFE24O1.htm

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