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Renewable Energy

Renewable energy is energy generated from natural resources such as sunlight, wind, and geothermal heat, which are renewable. Since we are useing way more energy recently than we actually need, the issue of energy saving has become more and more important. Many people doesn't know the up-to-date technologies of energy efficiency, although change is recommended. We cannot influence gas prices but we can make a difference on what we consume.

Passive House design would have a dramatic impact on energy conservation. A Passive House is a very well-insulated, virtually air-tight building that is primarily heated by passive solar gain and by internal gains from people, electrical equipment, etc. Energy losses are minimized. Any remaining heat demand is provided by an extremely small source. Avoidance of heat gain through shading and window orientation also helps to limit any cooling load, which is similarly minimized. An energy recovery ventilator provides a constant, balanced fresh air supply. The result is an impressive system that not only saves up to 90% of space heating costs, but also provides a uniquely terrific indoor air quality. Annual energy requirement   15 kWh/m2/year.
An Active House, as compared to a super low-energy Passive House, is a highly efficient home that captures more energy from renewable energy resources than the occupants need for heat and power. The surplus energy can be reproduced into the electric network.

The most common technologies to use renewable energy of our days are: Heat pump, Solar collector, Wood gasification units, Pellet boilers and stoves.

Energia solar energy Biomass geotherm renewable energy

Heat Pump

A heat pump is a device that uses a small amount of energy to move heat from one location to another. Heat pumps are usually used to pull heat out of the air or ground to heat a home or office building, or they can be switched into reverse to cool a building.For climates with moderate heating and cooling needs, heat pumps offer an energy-efficient alternative to furnaces and air conditioners. Heat pumps can be thought of as a heat engine which is operating in reverse. One common type of heat pump works by exploiting the physical properties of an evaporating and condensing fluid known as a refrigerant. In heating, ventilation, and air conditioning applications, a heat pump normally refers to a vapor-compression refrigeration device that includes a reversing valve and optimized heat exchangers so that the direction of heat flow may be reversed. Most commonly, heat pumps draw heat from the air or from the ground.
During the heating season, heat pumps move heat from the cool outdoors into your warm house; during the cooling season, heat pumps move heat from your cool house into the warm outdoors. Because they move heat rather than generate heat, heat pumps can provide up to 4 times the amount of energy they consume.
Higher efficiencies are achieved with geothermal (ground-source or water-source) heat pumps, which transfer heat between your house and the ground or a nearby water source. Although they cost more to install, geothermal heat pumps have low operating costs because they take advantage of relatively constant ground or water temperatures. However, the installation depends on the size of your lot, the subsoil and landscape. Ground-source or water-source heat pumps can be used in more extreme climatic conditions than air-source heat pumps, and customer satisfaction with the systems is very high.

Solar Collector

A solar collector is a device for extracting the energy of the sun directly into a more usable or storable form. The energy in sunlight is in the form of electromagnetic radiation from the infrared (long) to the ultraviolet (short) wavelengths. The solar energy striking the earth's surface at any one time depends on weather conditions, as well as location and orientation of the surface, but overall, it averages about 1000 watts per square meter under clear skies with the surface directly perpendicular to the sun's rays.
The system can be used in a variety of ways, including warming domestic hot water, heating swimming pools, heating water for a radiator or floor-coil heating circuit, among others.
Solar collectors can be mounted on a roof or wall, facing the equator. So a north-facing roof in the southern hemisphere, and a south-facing roof in the northern hemisphere is ideal. Depending on sunshine available, a 2 to 10 square metre array may provide 50 - 60% of the hot water heating required for a typical family house.


A recuperator is a special purpose counter-flow energy recovery heat exchanger used to recover waste heat from exhaust gases. In many types of processes, combustion is used to generate heat, and the recuperator serves to recuperate, or reclaim this heat, in order to reuse or recycle it. Recuperators are often used in association with the burner portion of a heat engine, to increase the overall efficiency. For example, in a gas turbine engine, air is compressed, mixed with fuel, which is then burned and used to drive a turbine. The recuperator transfers some of the waste heat in the exhaust to the compressed air, thus preheating it before entering the fuel burner stage. Since the gases have been pre-heated, less fuel is needed to heat the gases up to the turbine inlet temperature. By recovering some of the energy usually lost as waste heat, the recuperator can make a heat engine or gas turbine significantly more efficient.

Wood Gasification Boilers

(The real alternative for oil or gas central heating boilers.)
The combustion system employed in the woody Gasification Boiler solves most of the problems associated with the conventional wood boilers. Combining wood gas and smoke with high temperature oxygen results in a super-hot flame in the ceramic combustion tunnel. The gases stay in this hot, turbulent environment long enough to achieve an 89% combustion efficiency, this is what we call wood gasification. You only need to fill your boilder once a day with wood without becoming a slave to a boiler that needs a mountain to keep you warm. Wood burning (gasification) boilers provide a convenient, safe and environmentally friendly way to heat your home and domestic hot water with wood.
Wood gasification boilers burn so clean, they are safer (virtually no risk of a chimney fire) and result in cleaner air for everyone. Wood gasification boilers enable you to increase the warm security of your home in a safe, environmentally responsible way. Through continues research and innovation for the last 70 years wood gasification boilers for residential central heating has been develop to the highest standards in quality, function and appearance... excellence on all levels. In fact has earned the prestigious ISO 9001 certification, which assures consistently reliable product quality.

Pellet Boilers and Stoves

Wood Pellet Stoves are a new and very popular way as a means to provide heat. Pellet Stoves use wood pellets as its primary heat source. These wood pellets are tightly compacted and dense which causes it to be burned very efficiently and powerfully. Pellets usually come from the byproduct of sawmills and are very easily transportable due to their size and weight. These days, the prices of stove burning sources such as fossil fuels, chopped wood, natural gas and electric gas are gradually going up and wood pellets are a very cheap and easy to manufacture resource and has a very low pollution rate. These pellet burning stoves are usually more smaller and convenient then normal wood burning stoves.
Each pellet burning stove will vary in the size of the hopper. Obviously the bigger the hopper the more pellets you can load and the longer the stove will provide heat. Some stoves have automatic lighting and others may require you to light the stove. Then a device will transfer the pellets from the hopper to the heating chamber on a controlled and automatic system using an internal thermostat to gauge the heat and when more pellets are needed to be added. Then, air from the room is sucked in from a built in fan which is then transferred through the heating chamber. The hot air is then distributed back into the room or through your vent system of your house.