화학공학소재연구정보센터
Energy Conversion and Management, Vol.39, No.10, 1027-1044, 1998
Improved energy efficiency in absorption heat pump through process modification. Part II: Thermodynamic potential of liquid-liquid extraction of ammonia-water mixtures
Extraction-system-attached (ESA) ammonia-water absorption heat pumps were derived from the conventional system as a strategy to improve the energy efficiency of the conventional ammonia-water absorption heat pump. The ESA absorption heal pumps were obtained by attaching a liquid-liquid extraction unit in the conventional system. Theoretical thermodynamic simulation of the ESA and conventional ammonia-water absorption heat pumps showed that a higher COP and less irreversibility occur when the ammonia-water mixture is separated by the liquid extraction process instead of the non-isothermal process used in the conventional system. The ESA systems employing nitrobenzene as the extraction solvent gave the highest COP and the lowest irreversibility.