Clean Energy Technology

Thermally-driven heat pump, powered by hydrogen-enriched natural gas.

Water-to-water heat pump, transferring heat to or from a thermal storage tank to provide cooling or heating. An additional solar-thermal collector system heats the tank, to provide additional efficiency when the temperatures are low (like ground-source heat pumps).

Heat pump driven by thermal energy (delivered by steam or by combustion of natural gas), instead of being driven by electric energy (for mechanical heat pumps). Based on adsorption (with a solid adsorption medium) and evaporation of a refrigerant.

Central or individual heating system providing heat and hot water for multiple or individual rooms, automatically (i.e. independently from the loading) and generally using wood pellets, wood chips, chopped logs, cereal plants, or a combination thereof.

Non-mechanical heat pump, based on adsorption and desorption mechanisms using metal hydrides and hydrogen as a working fluid.

Heat exchanger that uses solar radiation to heat a water-based system, under high vacuum.

Thermally driven machine that cyclically compresses and expands a gas between different volumes. It includes both a heat engine and a heat pump.

Direct combustion of wood in an enclosed metal box which can be opened at the front for loading, for which exhaust fumes go in a chimney (as opposed to open-fires, whose efficiency is much lower).

Thermally driven heat pump, powered by synthetic methane.

Heat pump driven by thermal energy (delivered by steam or by combustion of natural gas), instead of being driven by electric energy (for mechanical heat pumps). Based on absorption (with a liquid absorption medium) and evaporation of a refrigerant.

Thermoacoustic heat pumps work by using an acoustic pressure wave to disburse heating or cooling effects, and generally feature a stack, resonator and heat exchangers. Two recent examples are the Equium heat pump, which rather than a compressor uses a patented sound generator at its core, and BlueHeart Energy, which works with two pistons that oscillate at a frequency of 100 Hz in a closed pressure vessel filled with 50 bar helium. Thermoacoustic heat pumps can reportedly reach higher or lower temperatures than conventional heat pumps, and do not require refrigerants.

Quadgeneration systems produce heating, cooling and electricity while simultaneously recovering CO2 from the exhaust gases.