John [jpratt27] has published an excellent summary of a new plan to develop a new solar-powered greenhouse in South Australia. This plant will not only produce fresh vegetables but will also be used to desalinate water in a very arid region. A few more details are needed about how the resulting salts will be dealt with, but the project looks very hopeful.
“GeoHarvey” has posted a lot of excellence and hopeful stories here. It’s nice to hear some good news for a change.
Science and Technology:
¶ A number of studies investigating the effect of wind turbines on birds have found that the actual impact wind turbines have on avians is relatively low. However, according to this new research, published in the European Journal of Wildlife Research, wind turbines’ effects on bats cannot be ignored. [CleanTechnica]
¶ Israeli alternative energy company Brenmiller Energy has solved one of the biggest issues with solar technology: how to generate electricity when the sun sets. The company says it will build a 10-MW solar facility that will generate electricity 20 hours per day through a proprietary energy storage technology. [Inhabitat]
¶ In Geneva, Switzerland just three weeks after the US Senate’s 98-1 vote that climate change is not a hoax, the first round of the 2015 United Nations talks among 194 nations produced the first-ever universally agreed negotiating text on how…
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Have you ever heard of the concept of an “Earthship“? I was introduced to the concept by my brother-in-law about 14 years ago and was blown away. What is an Earthship then? In a nutshell, an Earthship is an Eco-friendly home, made predominantly from recycled materials, designed to be as close to “off-grid” as possible.
The concept of Earthships arose in the halcyon flower-power days of the 1970s in various states in the southern USA. The concept seems to have developed by Michael Reynolds, an architect from New Mexico. As you can see in the linked Wikipedia article, his idea was not without problems, but it was, none-the-less revolutionary. Michael has a website where he educates about, demonstrates and promotes the Earthship technology. The site has designs for a number of systems that an Earthship needs if it is to meet code (see figure 2, below). Continue reading What the heck is an Earthship? … maybe an idea whose time has come!
One of my colleagues showed me this site today and it looks really good. This is a link to their blog page. This group has some pretty high priced help on their roster. From Harrison Ford to Hillary Clinton, they seem to have the bases covered.
One of the environmental movement needs more of is “good news stories” and this blog is replete with them. One that immediately attracted my attention is on a new initiative to stop poaching of African elephants. The article includes a video on the subject with the aforementioned celebrities. Worth a read. Don’t forget to bookmark the page.
I am constantly looking for good environmental blogs and have been following a really good one lately named “Environmental world for all”. The site is authored by a university student in peace studies with minor in environmental studies. One of the author’s recent posts discusses the benefits of solar LEDs for use as Christmas lights. It is a really well thougth out article and in it the author discusses the pros and cons around this issue.
When I left a comment and asked him about the ability to recycle these devices he brought my attention to this site (Solar Lights Recycling | Your Solar Link) in the US that is trying to set up a recycling program for these products.
If you are interested in environmental issues I think a few minutes browsing these two sites would be time well spent.
I spent 6 months living in Kathmandu back in the 90s. It was commonplace for the power to go off each evening for 2 or more hours and to cope with the outages everyone had battery backups and gas-powered generators.
But over here in Canada we have never needed battery backups or generators to keep things running. The electrical system is far more reliable here than it was in Nepal in the 90s. That being said, we do still get the occasional power outages but for the most part they are little more than an inconvenience. The same cannot be said for solar thermal systems when the power goes out. Continue reading Solar Thermal – What to do when the power goes out!
The City of Ottawa has a nice new web page that acknowledges the existence of solar energy, and in particular solar domestic hot water (SDHW). The site, which can be found on ottawa.ca gives information about two different types of SDHW systems: a CSA approved factory packaged system and not factory packaged system. Both types of installation need a building permit.
Both installation types must be installed by a qualified installer (CanSIA certified) but non-factory packaged installations must be certified compliant with CSA F379.1-09 (the reference standard for SDHW) and with the Ontario Building Code by a professional engineer licensed in the Province of Ontario.
This doesn’t sound like a lot of help, but when I had my solar system installed, there were no guidelines or standards available and we had to slog through a morass of bureaucracy to get our installation approved, so that guidance is very welcome.
This information should make the process of installing SDHW more transparent and it should really reduce some of the risks to the homeowners and installers. Good job Ottawa!
- Solar Thermal Program (miahillery.wordpress.com)
As I mentioned in earlier blog entries, my system has a number of failsafe features to maintain system heat and pressure within tolerable boundaries. In the summer, the system dumps excess heat into the swimming pool, and in the winter it dumps the excess heat into a radiant water heater in the basement.
This spring I got to see what would happen if I didn’t have these alternate heat sinks and I found out how robust the failsafe systems are in my installation.
Here’s what happened. To change my secondary (failsafe) heat sink from the basement radiant water heater to the swimming pool for the swimming season I need to open or close 3 manual valves. This spring, due to a brain malfunction, I only switched two of the three valves which meant that I had shut off the alternate heat sinks entirely. When I then manually switched the compter controlled valve (that determines whether to send water to the primary or the secondary heat sink) to use the “secondary” heat sink to dump heat, I had inadvertently gotten rid of all the system’s sinks. Effectively, I was just taking hot water from the solar collectors and circulating it back to the collectors without dumping any heat.
The first thing I noticed was that the pressure in the system built up (quickly) to 80 psi, from its normal 40 psi. This immediately got my attention and I looked at the collector temperature and found that it was 120 C – yes, that is degrees celsius, which means that the system was now boiling. I looked at the valve settings and realized my mistake and adjusted the valve settings appropriately, but by that time, it was too late … the failsafe features of the system had kicked in. My system had begun dumping antifreeze into a five gallon drum to reduce the pressure in the system. By the time I had realized this, the system was almost empty and the pressure had dropped to about 60 psi (by this time almost all vapour).
When I called my installer, he explained to me what had happened and suggested hooking the cold water from the city up to the antifreeze loop and filling the loop with fresh cold water. This had the effect of reducing the temperature and pressure immediately and everything and everyone calmed down immediately.
So what did I learn. Well…first and most important, even if you understand your solar system, you should not take it for granted. Keep checklists that help you with seasonal conversions and follow them. Second…the failsafe systems work. Even if I had not noticed the problem, the system would have emptied and the worst that would have happened is that my pump would have burned out. Finally, I learned how important it is to have your installer (or other expert’s) number close at hand…in my case the installer’s cell phone number was dymo-taped onto my controller and I was able to get hold of him – even though he was up at the cottage.
Does this make me less happy with my solar hot water system? On the contrary, I now know that even if I screw up, the family will still be safe, and I will be able to fix up the problems without spending a lot of money.
I don’t know if you have noticed it too, but there seems to be a lot more power outages and surges these days. I’m not talking about the 20 day variety like the one that hit us during the ice storm, but rather the one and two second ones that seem to come in bunches every few months.
Hydro has a fund to deal with hits to electronic equipment that is damaged due to surges like the one we had in Kanata when a 17 kV line dropped on a 10 kV line early in the last decade and fried a bunch of computers. Fair enough as far as it goes, but what about the things that didn’t burn up? What about the fridge that was supposed to last for 15 years, but ends up only lasting 10 years because it was hit by a large surge? What about the dozens of light bulbs that were supposed to last for 10,000 hours and end up only lasting half that because they experienced a big surge? Sure, they didn’t die when the surge hit, and there is no way to prove that their life span was decreased due to the surge, but doesn’t it make sence that it would be? Where is the compensation for these items?
OK you say, but that is history…old news…almost 10 years old now! What about today? Well, of course, you’re right. There aren’t a bunch of surges like the one I spoke of happening from day-to-day, but there are a whole bunch of little black-outs where the power drops for a few seconds and then surges back on. Aside from the inconvenience of having to re-set every clock in the house, have you never noticed anything funny with your electrical devices after such an outage? I have, and I am not speaking about problems with your computers because, like me, most of you will have shelled out hundreds of dollars to buy surge suppressing power bars or uninterruptible power sources (UPSs) for your high-end computer gear. No, once again, I am speaking about your equally expensive fridges, stoves, and even furnaces, each of which is now controlled by computer.
Every time there is a power outage in my house, the ice maker on my high-end fridge stops working. I have to cycle off the power on the fridge at the circuit breaker, leaving it off for at least a minute (so that any capacitors in the system drain) and then cycle it back on. Only then will the unit come back to life.
Or how about your heat recovery ventilator unit (HRV)? An HRV is critical to the healthy functioning of an R2000 or an energy star home as it keeps the humidity level in the house within reasonable limits). At my house, the same thing happens to my HRV when there is a power outage too. Once again, I have to cycle off the unit, wait, and then cycle it back on again.
To me, it is only reasonable to assume that these expensive devices “feel” these small power outages and surges. Doesn’t it make sense to you too? Well, if they “feel” the pain of the outage/surge combination, doesn’t it seem likely that they experience a shortening of their useful life when it happens? Where is the compensation for this loss of useful life for these expensive products?
The question in my mind is, if Hydro cannot provide more reliable power, shouldn’t they have to come up with some sort of mandatory standards for a new power distribution panel that includes surge suppression as well as some limited UPS (uninterruptible power source) capacity? And shouldn’t they subsidize the purchase and installation of these devices until the volume of sales drives down the cost to a reasonable amount, or until their service provision becomes more reliable?
I know that Hydro is bleeding red ink in a number of areas, like the need to replace dirty coal, the need to pay for expensive cogeneration, and the need to retire old debt, but in my opinion, these are symptoms of a poorly constructed business model. What they need, is to engineer resilience into their business model. I don’t want to have to replace everything in my home every time they fail to provide clean power to my home and I don’t want to have to pay through the nose to buy products to mitigate the risks associated with these instances.
Law suits are not the way to go…they are too expensive and the only ones that profit from them are the lawyers on both sides. Further, they are not the Canadian way. Rather, Hydro needs to just step up to the plate and consider the needs of their clients and get together with the various standards councils and come up with a strategy for making homes more resilient to the surges and outages until they can fix up their network so that it becomes more resilient. While they are at it, they might want to consider having each distribution panel set up for net metering (so that people can start feeding the grid using solar voltaic or wind energy generated around the home) and even consider having the panel set up to allow external generators to be plugged in (such as gas-powered generators that could be used during a long power interruption). This would allow for better engineered homes that were resilient to power fluctuations, that allow for cogeneration projects and that do all this safely with consideration for folks that have to work on the lines when there is an electrical problem in the neighbourhood.
In short, we need Hydro to take back the playing field and start planning for the future. A bright future if they play their cards right.
In another piece from MIT press, here is a story about how some MIT undergrads brought alternate energy education to schools in Ghana. Now if we could only get the education here in Canada…
I just ran across this interesting post about a small (1000 gallon per day) and smaller (80 gallon per day) solar-powered desalinization unit that could be deployed quickly and cheaply in disaster zones where potable water is hard to come by and electrical power even harder to come by. You can read more about it here: OpenEI Blog: Solar-powered desalinisation.
Got 5 minutes? Spend it watching the worlds’s energy history at the “Fighting for Hope’s” blog. Show it to your kids and to their teachers.
Solar system components
When you start to think about a solar system, you have to remember that the industry is relatively new in Canada. It has been used in Europe for decades, but its penetration on this side of the Atlantic has been marginal until recently. That means that you have to be conscious that some of the product on the market may not have been certified for use in Canada. The components that were installed in our house and that I will be speaking about below were all CSA approved and the “non-packaged” installation proposal that prepared was certified as compliant with the Ontario Building Code by a professional engineer.
It is a sad fact, but if you don’t get any sun, you don’t get any solar heat. But even the grayest areas of the country get a significant amount of sun. Thermomax, a is a Canadian company that uses European technology to provide solar hot water products. Its web site has done a great job of crunching the numbers to see how much water can be heated by a solar unit given the amount of sun available by region in Canada. Its regional comparison page can be found here. They also have a great set of interactive, audio enhanced graphics that explain how solar thermal energy systems work in various configurations. They can be found here.
I will be using their charts to get a better handle on how much money I have saved in the 4 years since I installed my system and will report back to you in a future blog entry.
In my earlier post I discussed how we decided to select solar hot water in our new house, but before we made the decision we had to understand something about the technology so that we could evaluate the options available to us. In this post, I will be describing the components involved in solar thermal systems in very general terms and I will wrap it up with a discussion of the “gotcha” points we ran into when implementing our solution.
When we bought our new house about 4 years ago, we wanted to be able to take some control over the utility costs so that when energy prices rise, we would have a bit of protection. There are lots of technologies out there that are environmentally friendly, but not all of them are suited to use in a sub-division and many have a low rate of return on investment. Further complicating matters is the fact that many of the municipal inspectors have no idea what they are looking at when presented with some of the new technologies. So which one to choose… Continue reading Solar Hot Water – Not easy, but worth it!