Stirling Heat Engine, Peltier Device, and Iceland
The Stirling engine, which is known for its high efficiency, is a machine that uses heat energy to generate power. A Stirling engine works in a four-step process, compressing cold gas, heating the gas, expanding the hot gas, and cooling the gas. This process is repeated over and over again. The heat can come from a variety of sources such as solar power, nuclear, or biological waste. One of the positive effects of this type of engine is that it doesn’t generate any emissions.
Peltier device is a machine that converts geothermal energy into electricity. This device can be used both for thermoelectric cooling or heating and come in a variety of models for different purposes. This type of energy depends on hydrogen and Iceland is hoping to become one of the first countries to use such method as a renewable source of energy and turn itself to a hydrogen economy.
References:
http://www.nordicgreen.net/startups/article/six-stirling-powered-cleantech-solutions-scandinavia
http://www.gasandoil.com/news/europe/e447f4815fede2edb36a05b568762078
http://tetech.com/peltier-thermoelectric-cooler-modules/