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This process is where you build a credit on your hydro and  only pay for the net difference of electricity you use.

 
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Photovoltaic (PV) panels, capture energy released from the sun and convert it to usable electricity.

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Wind energy converts kinetic energy absorbed by turbines into usable electricity

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Solar Pool & Water

 
 

Solar water heating systems are commonly referred to as Solar Domestic Hot Water (SDHW)  

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 Solar Domestic Water Heating

from Natural Resources Canada

Solar Water Heating Systems

Solar energy is a clean and abundant energy resource that can be used to supplement many of your energy needs. Solar energy can be utilized as a form of heat, such as solar water heating, and as electricity, such as solar photovoltaics. Solar water heating systems are commonly referred to in the industry as Solar Domestic Hot Water (SDHW) systems.


Consumers often ask if there is enough sunlight in Canada to support solar applications such as water heating. In fact, there is enough solar energy to deliver an average of 2500 kWh of energy per year. This means that a solar water heater can provide enough solar energy to meet about one half of the water heating energy needs for a family of four.

Chart

Water heating is one of the most cost-effective uses of solar energy, providing hot water for showers, dishwashers and clothes washers. Every year, several thousands of new solar water heaters are installed worldwide.

Canadian manufacturers have developed some of the most cost-effective systems in the world. Consumers can now buy "off-the-shelf" solar water heaters that meet industry-wide standards, providing a clean alternative to gas, electric, oil or propane water heaters. Freeze-protected solar water heaters manufactured in Canada have been specifically designed to operate reliably through the entire year, even when the outside temperature is either well below freezing or extremely hot.

Benefits from Solar Water Heating

A solar water heater reduces the amount of fuel you need to heat water because it captures the sun's renewable energy. Many solar water heaters use a small solar electric (photovoltaic) module to power the pump needed to circulate the heat transfer fluid through the collectors. The use of such module allows the solar water heater to operate even during a power outage.

Solar water heaters can also be used in other applications, for example, car washes, hotels and motels, restaurants, swimming pools, and laundry mats.

There are many possible designs for a solar water heater. In general, it consists of three main components:

  1. Solar collector, which converts solar radiation into useable heat.
  2. Heat exchanger/pump module, which transfers the heat from the solar collector into the potable water.
  3. Storage tank to store the solar heated water.

auxiliary tank and a solar preheat tank

Most medium to large systems have both an auxiliary tank and a solar preheat tank with a heat exchanger.

The most common types of solar collectors used in solar water heaters are flat plate and evacuated tube collectors. In both cases, one or more collectors are mounted on a southerly-facing slope or roof and connected to a storage tank. When there is enough sunlight, a heat transfer fluid, such as water or glycol, is pumped through the collector. As the fluid passes through the collector, it is heated by the sun. The heated fluid is then circulated to a heat exchanger, which transfers the energy into the water tank.

When the homeowner uses hot water, cold water from the main water supply enters the bottom of the solar storage tank. Solar heated water at the top of the storage tank flows into the conventional water heater and then to the taps. If the water at the top of the solar storage tank is hot enough, no further heating is necessary. If the solar heated water is only warm (after an extended cloudy period), the conventional water heater brings the water up to the desired temperature.

Solar collectors positioned facing southeast to southwest

Solar collectors should be.

solar collector components

Cutaway view showing glazed flat plate
1. Metallic Absorber
2. Glazing
3. Housing
4. Insulation
5. Heat transfer fluid inlet
 
 
 
 
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