Hidden Thermal Solar Collectors for your House

Dawn Solar Systems Inc. produces renewable energy systems that integrate seamlessly with a building’s architecture, providing energy security and reducing operating costs by replacing fossil fuels and electricity with solar energy.  Residential and commercial systems are available today that can provide electricity along with hot air and water for heating and cooling, all harvested from a shared roof or wall surface.

That is the pitch that Dawn uses to describe their solar collectors hidden under the roof and/or walls of your house.  The system is installed during initial construction or a roof replacement.  Depending upon location and application design, an open or closed loop system can be created as fluids are pumped through the system and cycled through conventional heat transfer and distribution systems.  The following applications can be used with the heat collected in the system.

• Domestic hot water heaters
• Institutional, commercial and industrial process water systems
• Radiant floor heating systems
• Swimming pool heater
• Warm air heating systems
• Remote site or isolated cabin applications
• Integrations with photovoltaic systems
• Attic space cooling
• De-icing

Their system is compatible with several commercially available roof coverings.  The system occupies a one-inch layer between the building sheathing and underneath appropriate roofing and siding materials creating an hidden solar collector.  The system is an “active system”; it harvests the suns energy by absorbing the heat into a fluid that is pumped through either a closed or open loop storage heat exchange and storage system. Closed loop systems are recommended in the north (with glycol protection), open loop systems may be used in the south. 

Dawn provides systems that produce solar electricity and solar hot water from the same area on the roof or wall.  When coupled to a photovoltaic system the their system improves the output of the PV system by removing excess heat from the roof area and transferring the heat to space heat or hot water. Their systems can be coupled to DC pumps (avoiding the loss that occurs in converting the PV panel output from DC to AC) that in turn can be powered by the PV panels, further reducing energy consumption.

Prices will vary with system location and complexity, but using a system that produces +/- 250 BTU per square foot, per day, a Solar Domestic Hot Water System (SDHW) furnished and installed on a turnkey basis by a dealer will cost in the range of $7,000.00 to $8,000.00, not including roofing or siding systems.

They have working installations in Colorado, Connecticut, Maine, Massachusetts, New Hampshire, New Mexico, Texas, and Vermont.  Systems are scheduled for installation in Arizona, Florida, New Jersey, New York and Utah later in 2005.

Resource: Dawn Solar Systems, Inc., Brentwood, NH

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Comments

[JesseJenkins]

Ever since I found out that a PV's efficiency goes down as it heats up, I've been thinking that it would make perfect sense to couple a PV with a solar hot water heating system that would act as a heat sink for the PV. It looks like these guys have done just that. Simple and brilliant. Thanks for digging this one up, Jim.

[Engineer-Poet]

That's great for something like a swimming-pool heater, but for purposes where you want a glazed collector (year-round DHW) the goals of heating water and using the PV at max effciency are in conflict.

[JesseJenkins]

Its great for a swimming pool heater, as you point out E-P, or for preheating water that is later sent to a hot water heater (preferably a tankless one) to heat to the desired temp for domestic hot water uses.

[Engineer-Poet]

It doesn't work as a preheater in most of the north.  Either you glaze the collector to make it warm enough to be useful in winter (and lose efficiency from reflection and overtemperature), or you don't and you have to keep it drained much of the year.

I get the feeling that most people who don't grasp this live in SoCal. ;-)

[Gary]

Hi,
I would suggest that anyone interested in this system read the SRCC certification report, with particular attention to the heat output under various conditions.
The system can produce some useful heat output under some conditions, but its output would be very limited in northern climates.
SRCC site: http://www.solar-rating.org/RATINGS/RATINGS.HTM
The Dawn Solar collector report is in the Directory of SRCC Certified Collectors

Gary

[Aliaksandr]

Здравствуйте,
Я думаю, что неэффективный сбор тепловой энергии солнца с помощью крыши эффективен только в солнечной Калифорнии и т.п. Нам,жителям 53 параллели надо думать о более эффективных коллекторах, что бы помочь основной печи на дровах.
Hi,
I think, that inefficient gathering of thermal energy of the sun with the help of a roof is effective only in solar California, etc. To us, inhabitants of 53 parallels it is necessary to think of more effective collectors what to help the basic furnace on fire wood.
Excuse, for computer English
Republic Belarus

[solar]

Yes! Keeping in mind the drastic environmental changes and rising fuel prices going Solar is one option open to all at minimal investments. The Solar Water heating systems are so easy to install and most of them come in a Do-it Yourself kit, With the technological advancement the once heavy, bulky hard to move panels are now available widely in light weight easy to carry by one personal only packages. The advancement in technology is not only limited to light weight, but for those concern about the aesthetics of the panels, the good news is that the panels are now available with a variety of trim colors to choose from and can be easily matched to your roof. Saving about $25.oo on ones electricity bill every month on a residence of 4. We all use hot water, as one of our basic needs and what can be a better way, than helping our environment, saving our resources and ourself's some money other than by investing in a Solar Water Heating System.
There are a couple useful websites I'm aware off, that I would like to share with you
1. www.dsireusa.org - is a comprehensive source of information on state, local
, utility ans federal incentives that promote renewable engery ans energy efficieny.
2. www.powerpartnerssolar.com - one of the many manufacturers of certified Solar Water Heating Systems available. One place I saw the light weight panels and trim color options I was mentioning earlier.
Lastly, the local utilites in some areas also provide additional rebates and incentives for adding a Solar Water Heating Sytem to your exisitng water tank.
Keep the look out on. Feel Good and save- money for you, environment for us.

[Cynthia]

Dear Sir;

We are manufacture of flat solar collector and water heater in China.

Currently we manufacture:

Flat solar collector with copper collector: black Chrome ,blutec eta and black anodized coating

Flat solar collector with aluminum absorber

We are certificated by SOLARKEYMARK, and CE.

Please visit us at: http://www.creativeintlcn.com

We also manufacacture solar water heater

Attached some picture introduction of our factory

We are professional and flexible and willing to do business with you

If you are interested in our products, please feel free to contact me.

We hope to read from you

With all the best
sincerely

Cynthia

Creative Solar Energy Co.,Ltd
Web: http://www.creativeintlcn.com
Email: info@creativeintlcn.com
Tel: 0086-757-87278638
Fax:0086-757-87278636
Mobile: 0086-013450779260

[Solar Panel Builder]

It is amazing how something like Solar Panels (which will be the norm in a few years) is still so expensive to build.

I recommend to build your own installation - people don't realize how easy and inexpensive this is. My friends built solar installations and saved BIG.