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Don't Miss The Great Solar Debate: Where Does the Global Solar Industry Stand? Click Here to Register! ×

Hybrid Solar Heat and Power Systems On the Rise

Residential combined heat and power systems could grow as much as 49 percent over next ten years, according to Pike Research. Cogenra Solar could ride that wave.

Jennifer Runyon, Managing Editor, RenewableEnergyWorld.com
July 18, 2012  |  9 Comments

According to "Residential Combined Heat and Power," a new study by Pike Research, the market for residential combined heat and power (resCHP) systems – defined as small, distributed energy generation systems that produce electricity for residences while also capturing heat that would otherwise be treated as waste – is still very small, but growing rapidly.

“Besides being more efficient than the traditional power grid and easier to build than conventional power stations, resCHP systems have the additional benefit of producing thermal energy that can be used as heat, converted to electricity, or converted to cooling when coupled with an adsorption chiller,” said research director Kerry-Ann Adamson.  According to the report, the drivers for growth in this sector over the next decade include volatile energy markets, in which residential power costs can fluctuate dramatically from season to season, as well as increasing levels of fuel scarcity in a number of countries. In addition, aging transmission systems in many countries are contributing to the rise of blackouts and brownouts, such as this summer’s widespread power outages along the Eastern Seaboard of the United States. The distributed nature of resCHP systems makes them less vulnerable to outages on the centralized power grid.

Last week at Intersolar, we spoke with Mani Thothadri of Cogenra about the company’s technology. Cogenra is a CPV company at heart, said Thothadri, but its technology captures the “waste” heat and uses it to produce hot water on its installations.  The company boasts Facebook as one of its first clients.  Thothadri said the company is now looking to use the heat for solar cooling.  The video below has more on the company and its plans.

9 Comments

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Elias Fekadu
Elias Fekadu
July 20, 2012
It is intersting to read news of recovering market for renewable energy sources particularly solar. how can we in africa where solar energy is plenty get involved in the marketing system taking notice of the lack of capital to start bussiness? is there any firm out there ready to work with low financed but potentially attractive african green energy market. There are good bussiness minded people waiting for mutualism.
Ann Vole
Ann Vole
July 19, 2012
Yes, I looked at 12 companies mentioned and their websites and external news articles about them. I have some ideas for a 4-stage solar conversion system: concentrating solar for PV and solar thermal, non-concentrating solar heat that also captures radiant heat of hot parts of the concentrating solar (low E glass), and cooling the box it is in with a heat pump to recover all lost heat (as preheating for a ground-coupled loop). Of course such extreme measures are only required when space for solar input are at a premium. High efficient buildings (like PasivHaus) and thermal storage can also reduce the need for solar inputs including solar-sourced cooling but it is fun to strive for 100% efficient solar energy capture. I still cannot determine Cogenra's method of solar cooling as mentioned in the video. I am assuming they are using the solar thermal heat gathered to power some form of heat pump but that is pure assumption.
Tom Lakosh
Tom Lakosh
July 19, 2012
Ms. Vole; The linked summary of the Pike report seems to cover all of those options but the Conegra system is parabolic trough c-Si CPV with liquid cooling of the solar cells allowing heat recovery from the cooling liquid. Dawn Solar just puts a radiant heat loop under a metal roof that has flexible a-Si panels stuck to it. Zenith is a parabolic dish, Type III-V CPV with liquid cooling. Zenith claims over 75% solar energy capture using the high efficiency solar cells and high temp heat capture. With a coolant temp over 185 F, you can run a secondary ORC turbine/generator for >42% total electricity conversion and you can still use the spent refrigerant for space heating.
The trick would be to use relatively cheap solar cells with a low thermal loss coefficient so you can capture higher temp heat for a broader range of heat applications including secondary power generation.
Ann Vole
Ann Vole
July 19, 2012
I am confused at what the technology is being referred to here. 1) Solar PV cells built into thermal solar panels (including concentrating thermal re the video) 2) systems turning fuel into both heat and electricity 3) micro-steam (or refrigerant) turbine systems that turn solar thermal heat into mechanical energy to create electricity or to power heat pumps and use thermal energy storage for heat sinks on the low pressure side of the turbine 4) using the thermal solar on the condenser side of a heat pump 5) a combination of the above. I have come up with lots of schemes for this sort of thing for use in buildings lacking access to passive solar options and possibly adding thermal heating from pumped hydraulic oil powered by a wind turbine or solar powered Stirling engine. If I missed describing a possible technology here that this article or one of the comments is referring to, please let me know. PS 'BIPVT' stands for Building Integrated Photo-Voltaic/Thermal and could be used to describe most of the possible combination I listed but might also include solar thermal storage at the panel locations and solar chimney air pumping. Edit: some companies use the term "hybrid" to refer to combining structural features of a building with solar energy capture.
Tom Lakosh
Tom Lakosh
July 19, 2012
Dawn Solar and Zenith solar too. I'd like to see building codes that require all South facing roofs made of BIPVT metal skin insulated foam structural panels using Fresnel or Hypersolar focusing cover plates to direct insolation to the Type III-V thin film PV cells epoxied to and covering the coolant channels in the corrugated metal skin.
John Errey
John Errey
July 19, 2012
There are a number of companies building such systems ranging from VW and Honda with gas powered ICEs, Ceramic Fuel Cells (an Australian Co with facilities in Germany), Blue Gen ( a NZ Co using Sterling engine) and a number of Japanese companies with Fuel Cells.
Kevin Meyerson
Kevin Meyerson
July 18, 2012
In Japan, resCHP is already quite popular via the ENE-FARM program.

Like any distributed energy generation system, the energy security benefits, especially from the perspective of defence costs for a country like the US, are staggeringly large.
Ryan Stepp
Ryan Stepp
July 18, 2012
The Echo solar system is the only hybrid residential system that delivers both electrical and thermal energy savings. Echo is also the first & only hybrid system available offering customers a $0-down lease option.
Will Stockton
Will Stockton
July 18, 2012
Are there companies specializing in this on the residential side?

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Jennifer Runyon

Jennifer Runyon

Jennifer Runyon is managing editor of RenewableEnergyWorld.com coordinating, writing and/or editing columns, features, news stories and blogs for the publications. She also serves as conference chair of Solar Power-Gen Conference and Exhibition...
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