These are thermal pump split systems. Every air-conditioning unit relocates energy in the form of heat from one place to another. Split means that the system consists of one body outside the building and one or more inside. The most popular are the wall air-conditioners offered in two types:
The micro-ventilation is the easiest way of self-regulating ventilation *. The airing through micro-ventilation relies solely upon ensuring that the air passes through the windows without forced air circulation in the rooms. Self-regulation depends on the power of the external air flow. Special plate mounted in the sash of the window closes automatically when the pressure of the outside air flow exceeds certain level.
* Ventilation of automatic operation mode without the involvement of the inhabitants.
Renewable energy sources are all sources that practically cannot be exhausted when utilized by people for energy sourcing.
Known RES so far are:
(energy from solar and photovoltaic panels);
(energy from wind generators);
(energy from WES, tidal, sea waves);
(energy from geothermal installations);
(energy from biomass stations);
Generally, the production of energy from recoverable sources is supported by the European legislation. When you use recoverable energy source, you can rely to buy the electric energy at preferential prices.
Regrettably, the utilization of energy from non-renewable sources is still prevailing:
Nuclear (uranium) power;
The geothermal installations draw heat from the earth in winter and evacuate heat from the building back to the earth in summer. They utilize the relatively constant soil or underground water temperature as a heat source. The underground layer at depth of more than 3 m is with temperature of approximately 7-14° С throughout the year. At bigger depth, temperature variations are even less (see diagram).
According to the heat drawing, the following geothermal installations are differentiated:
Open system (through direct water pumping);
Closed system (through circulation of antifreeze or refrigerating agent);
According to the digging works, the following geothermal installationsare differentiated:
With vertical drilling (for rocky earth or lack of area);
With coil in a wide shallow excavation (for softer soil and sufficient yard area);
The drilling solutions utilize two ways of used water evacuation:
By one drill and drainage in the canalization (for sufficient quantity of underground waters);
By two drills and drainage back to the earth (to prevent from unbalancing the level of underground waters);
Practically, drilling at the depth of less than 15m is of little efficiency and is financially unreasonable.