An absorption refrigeration system can include: an evaporator configured to evaporate a first refrigerant; an absorber configured to contain an absorbent solution and absorb the evaporated first refrigerant; a regenerator configured to regenerate the absorbent solution by heating the absorbent solution supplied from the absorber; a condenser configured to condense the first refrigerant evaporated in the regenerator; a cooler configured to circulate a second refrigerant inside the evaporator, where the second refrigerant is cooled in the evaporator by evaporation of the first refrigerant; a hot water storage tank configured to store hot water that is heated by absorbing heat from the absorber and the condenser; one or more hot water consumption units configured to receive the hot water from the hot water storage tank; and one or more cold air consumption units configured to receive cooled second refrigerant from the evaporator via the cooler.