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Commonwealth of Dominica

Solar Water Heaters

Solar Water Heaters

The main benefit of a Solar Water Heating System is to have the use of hot water without having to continually pay for electricity or gas to heat the water. A typical family of 5 will use approximately 20 US gallons of hot water per person per day (5 x 20 = 100US gallons per day). The cost of purchasing and installing an electric heater is approximately $796.00 with an additional cost of approximately $1,551.00 per year in electricity. In contrast purchasing and installing a 50-gallon solar system costing approximately $5000.00 (one time investment) results in a potential annual savings of approximately $1380. (XCD$1.18 per kw/hr). Solar systems can potentially pay for themselves in under 4 years (48 months). US$1.00 = XCD$2.67

At EMS our Solar Water Heater Systems are ideal for many applications, and have been used successfully by many hotels, restaurants, and other industries.

How your EMS Hot Water System works to harness the power of the sun.

With Flat plate solar collectors, the solar rays strike the panels at an oblique angle during the early and late parts of the day and are only perpendicular at midday. Calculating the angle of a solar collector plays an important part in the flat panel’s performance. Solar angles (the angle at which the panel meets the sun) plays very little role with solar vacuum tubes as the sun is always striking at an optimum angle.

Because of the pure vacuum, there is virtually zero heat loss. This is evident by touching a glass vacuum tube which is cold while the liquid inside can be boiling. Almost 94% of the sun’s energy is directed to the inside of the tube and is captured. Flat panel collectors will always loose heat through the glass and become less efficient at higher temperatures.

Inside your EMS Hot Water System. Why is it Superior to the rest?

The Advantages of solar vacuum tubes with copper heat pipes have a further benefit over other solar systems in that they can be scaled down by unplugging a couple heat pipes. Because the internal heat transfer fluid is isolated, removing a tube will not shut down the system. This allows for some seasonal control. In the summer month you may find the solar system produces too much heat, you can simply unplug a number of the tubes to scale back the output. This also means that a broken vacuum tube will have little effect on the operation of the system. The system can also operate at high temperatures whereas the flat panels experience less efficiency when under higher temperatures.

The growth worldwide for solar vacuum tubes is growing exponentially and is expected to surpass flat plate collectors within the next 5-10 years. Currently Asia used 95% evacuated tubes in solar applications and Europe is quickly adopting vacuum tubes in areas such as home heat and even solar air conditioning.