Gas Absorption Heat Pumps
Gas Absorption/Adsorption Heat Pumps (GAHP) use a combination of a carrier and refrigerant which have a natural affinity. GAHP’s use heat to change the composition of the carrier & refrigerant solution and by changing the solution state (liquid-gas-liquid), heat equating to the latent heat of vaporisation is transferred.
The most common solution mixture is ammonia as the refrigerant and water as the carrier. The diagram below demonstrates the process.