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y people are confused as to how solar panels actually work. This confusion is perfectly reasonable and stems from the general acceptance of solar panels on things like calculators or garden lamps. [link widoczny dla zalogowanych]
These types of solar panels are called photovoltaic solar panels or PV Solar Panels.
The panels that give the greatest opportunity to reduce household fuel costs are called Solar Water Heating Panels.
Solar Water Heating Panels
Solar Water Heating Panels use the sun’s radiation to heat water in panels. This panel is connected to your hot water storage tank. When the temperature in your tank is lower than that of the panel on your roof the water is pumped out of the roof panel through a heating coil in your hot water tank. This heats the water in your storage tank. When it is cold and dull outside the pumps remains switched off leaving the your storage tank to be heated by your conventional boiler.
This simple but effective system is typically capable of heating up to 70% of your annual requirement for domestic hot water.
Given this fact it is probably the most cost effective way of installing a renewable energy system in your home.
Flat plate vs Evacuated tube solar collectors/panels
There are two common types of solar collector used in the UK.
- Flat plate collectors
- Evacuated tube collectors
Evacuated tube solar collectors are typically more efficient than flat plate collectors. This does not necessarily mean that evacuated tubes can produce more hot water just that the panel area can be reduced. Typically you will find that for a flat plate collector area of 4m2, evacuated tubes need approximately 3m2 for the same size hot water tank. With this in mind [link widoczny dla zalogowanych], the amount of hot water generated throughout the year will be very similar.
An independent study by the Department of Trade and Industry (DTI) compared a number of different types of system and the panel that produced the most hot water was of the flat plate variety.
The cost of the panels are now fairly similar, but some people believe that flat plate solar collectors are more aesthetically pleasing. However [link widoczny dla zalogowanych], technically the evacuated tubes should perform better than flat plate systems even when the ambient temperature is low, i.e. in winter.
Where does the energy used in our homes go?
This is a useful question when trying to determine payback on technology such as solar water heating panels.
Electricity generated by Solar PhotoVoltaic Panels is fairly simple to determine as this is metered and exported to the national grid at an agreed price. However, when looking at solar water heating panels this calculation becomes more complicated.
Solar water heating panels contribute to your gas or oil bill and it is not immediately obvious how much of your oil or gas is used to heat your hot water vs heating your home.
The vast majority of energy used in our homes is for space heating. However 31% of the gas used in a normal home is used to heat hot water. So if you install solar hot water panels and expect to save 50-70% off your hot water heating bill then you can determine that this is likely to reduce your gas bill by between 16 and 22%.
About the Author:
Peter Searancke is an engineer with many years experience in construction and renewable energy technology. He now runs a successful consultancy and installation company which work closely with partner company Intelligent Energy Solutions, providing Solar Water Heating Panels,