What type of coolant should you use for your solar system?

I just came across an interesting item describing the three most common types of coolant for solar hot water systems and some of their properties. The article seems to be written by the manufacturer so there may be a bit of bias, but it does highlight the issues inherent in coolant selection. It is short […]

What the heck is an Earthship? … maybe an idea whose time has come!

earthship brighton
figure 1: Earthship Brighton (Photo credit: ivanpope)

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!”

Pool leaks are an environmental disaster!

swimming pool
swimming pool (Photo credit: freefotouk)

Regardless of what anyone tells you, if you live in North America your pool should not be losing more than about an eighth of an inch of water (3 mm) each day in the summer.  If it is losing more that that…don’t ignore it and don’t let people tell you that the larger amount of water loss is to be expected.  An inch of pool water is a huge amount and the western world is just beginning to understand that water is our most precious resource.  Don’t waste it like I did!

My family has had an in-ground swimming pool since the kids were little. Generally, we have only had to fill up the pool in the early spring and we are more-or-less good for the rest of the season.  There is a bit of evaporation, but it is usually replaced by rainfall.  This year, unfortunately, was “off the charts” as far as water consumption goes and that is an environmental disaster. Continue reading “Pool leaks are an environmental disaster!”

Solar Thermal – What to do when the power goes out!

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!”

City of Ottawa – Help for Folks Installing Solar Thermal

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 […]

Failsafe systems for solar hot water

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 […]

So, what solar equipment do I need to buy (part 1)?

 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.

The solar collectors we use in our house are the CAREarth Vacuum Tube Solar Collector SJ Series Heat Pipe Technology.  Continue reading “So, what solar equipment do I need to buy (part 1)?”

But, it’s always cloudy and cold here! What good is solar heat here?

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 […]

How does solar thermal work?

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.

 

Continue reading “How does solar thermal work?”

Solar Hot Water – Not easy, but worth it!

Traditional Roof Mount
Traditional Roof Mounted Solar Hot Water Array

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!”