Solargas combination boilers

The principle here is that a 240-litre tank is heated by flat plate solar collectors supplemented by a gas burner within the body of the cylinder. A heat exchanger coil in the upper half of the tank heats the central heating circuit. A production solar-gas combination boiler with 2.83 m2 of solar collectors produces 4GJ/year;3 a 5.4 m2 collector supplies 5.64GJ/year. A test involving 25 units showed boiler efficiency of 90.1%. On average, consumers saved 650 m3 of natural gas compared with conventional systems. At 2000 prices this gave a payback time of 13 years; at today's prices it will be much shorter. Another factor to consider is that it would be carbon neutral if biogas were employed (see Fig. 2.8).

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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