Monday August 26, 2019 from 15:30 to 17:10
Experimental assessment of a detachable plate falling film heat and mass exchanger couple using lithium bromide and water as working fluids
Tianle Hu1, Yuhao Yi1, Xiaoyun Xie1, Yi Jiang1.
1Building Energy Research Center, Tsinghua University, Beijing, People's Republic of China
Massiveness and cost have impeded the promotion of absorption heat pump (AHP) system for a long time. An improved detachable plate falling film heat and mass exchanger (HMX) couple using lithium bromide (LiBr) and water as working fluids is proposed and a resulting prototype is experimentally assessed. The HMX couple can work as either a generator-condenser couple, or an absorber-evaporator couple in an AHP using LiBr and water as working fluid. In generator-condenser condition, overall heat and mass transfer coefficients of the generator were 0.607~1.008 kW×m-2×K-1 and 4.4×10-5~18.4×10-5 m×s-1 respectively, and overall heat transfer coefficient of the condenser varies from 0.372 to 1.466 kW×m-2×K-1; in absorber-evaporator condition, overall heat and mass transfer coefficients of the generator were 0.235~0.422 kW×m-2×K-1 and 0.7×10-5~1.5×10-5 m×s-1 respectively, and overall heat transfer coefficient of the condenser varies from 0.785 to 1.173 kW×m-2×K-1.