Monthly Archives: July 2011

How to choose a solar water heating system

Solar water heating systems are becoming very popular to meet the water heating needs but there are some points to be paid attention to while chosing them. They are:

1. Economics
   Like all purchases, solar water heating systems require a good economic analysis. Solar water heaters may cost more than conventional water heating systems but they are generally more cost effective in the long run. The money you would save depends on your hot water needs, system efficiency, your solar resource and of course the costs for a conventional system. However, roughly speaking it can be said that a solar water heating system can save you 50% to 80% of your water heating bills. Besides, since sun is free you will not be affected by price increases due to fuel shortage.
2. Your solar resource
   Since sun is the fuel for your new heating system, you may want to know how much you can find it. Before installing a solar water heating system, you first should know how much sun – free fuel- you have throughout the year. Slar water heaters can be used even when the weather is overcast. If your solar panels are installed in unshaded faces, you can consider it having good solar resource.
3. Sistem Size
   Sizing a solar water heating system basically includes determining the total collector area and the storage volume. A god system would be able to meet 90% to100% of your hot water needs during the summer. Solar System contractors use worksheets and computer programs to help determine system requirements and collector sizing.
   Storage Volume again depends on your hot water needs. It is also related with the collector area so there will not be overheating or underheating.
4. Solar Water Heater Efficiency
   For a solar water heating system, solar energy factor (SEF) is used to determine its energy efficiency. It is the energy delivered by the system divided by the electrical or gas energy put into the system. The higher the number, the more energy efficient. Solar energy factors range from 1.0 to 11. Systems with solar energy factors of 2 or 3 are the most common.
5. Annual Costs
   Before deciding for a solar water heating system, it is possible to estimate annual operating costs and compare it with other ystems so you can calculate the payback period and decide for the best system.
6. Installation and Maintenance Costs
   When comparing solar water heating systems, you should also consider installation and maintenance costs. Some systems might cost more to install and maintain.
7. Local regulations
   While deciding you should first check f there are any local regulations or codes for installing a solar water heating system.

About the Author

Sam Braidley is a author who writes on topics centered around green technology, for more information please visit his website. http://www.greentech.ie

END OF THE SOLAR SISTEM

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