Chemical Heat Pump Based on Hemiaminal Reversible Reactions

摘要

Heat pumps are widely used in different fields, such as the petroleum and chemical industries,udbrewery, printing, etc. Traditional heat pump based on lithium bromide-water or ammonia-waterudas refrigerant and absorber waste a lot of energy while using it to absorb heat from the environment.udThe low efficiency of traditional heat pump is an obstacle for development. In recent years,udchemical heat pumps based on reversible chemical reactions were introduced, which can improveudthe efficiency and have a great potential. The hemiaminal reaction, which is one of the chemicaludreactions, can be potentially used in chemical heat pump based on reversible chemical reactions.udIn this paper, simulations of hemiaminal reactions and simulated process design of heat pumpudbased on hemiaminal reaction is discussed. Two ways were used to calculate the equilibriumudconstant of hemiaminal reaction: 1) density functional theory(DFT) and 2) neural network (NN).udAnd based on the simulated equilibrium constant, the whole process was simulated in Aspen Plusudand simulation result shows the new chemical heat pump system can get a coefficient ofudperformance (COP) more than 2.5, which is higher than the literature results of other kind ofudchemical heat pump (between 1.0 to 2.4 [17]). There is a great possibility that, in the future, thisudkind of chemical heat pump will be widely used in different fields.