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مکانیک::
جرم
sites for solid wastes including radioactive residues, hydroelectric reservoirs, mining sites, surface needs for biomass production, and large-scale exploitation of renewable energy
Wastes (convertible to useful energy via waste-to-energy incineration and other processes) and biomass fuels are sometimes viewed as sustainable energy sources.
The first set of countries often relies mainly on biomass as the primary source of energy, mostly for cooking; the share of residential energy demand often exceeds 75% of the
The latter can include various forms of biomass (e.g.
Energy can be input to DHC systems using various devices that include conven- tional fossil fuel boilers, biomass boilers, CHP, heat pumps, and technologies that recover waste heat from municipal, commercial, and industrial activities.
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