Forward Osmosis Absorption Heat Pumps for Space Conditioning and Graywater Purification: Cycle Development and Working Fluids Selection

Abstract A thermodynamic model is developed for a forward osmosis (FO) absorption heat pump capable of purifying graywater and providing year-round space conditioning with low-temperature as the primary energy input. The applied to 16 potential absorbents, six are selected parametric studies on desorber temperature, absorber condenser sink temperature determine effects ratio (defined total useful output power input) cycle required flowrate. Experiments conducted test water flux reverse solute in FO most promising absorbents. Of four two salt-organic mixtures pure salts appear have behavior, while an ionic liquid demonstrates best behavior.