Study on absorption heat pump using hydrophobic membrane

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Heat and mass transfer in water vapor absorption into LiBr/water solution has been investigated experimentally. Metal foam was attached on the cooling wall, and the absorbent liquid flows in the metal foam. The metal form was covered with a hydrophobic membrane, through which the vapor was absorbed into the absorbent liquid. As a basis of heat transfer in the metal form, heat transfer coefficients were measured for liquid single-phase forced convection, condensation and evaporation. The pressure loss of vapor passing through the membrane was measured and compared with theoretical value. The effect of membrane on the vapor absorption into liquid was clarified.