Single effect and double effect absorption refrigerating system

Abstract

This application discloses a single effect and double effect absorption refrigerating system, in which water is used as a refrigerant and LiBr as an absorbent, for example. A refrigerating cycle is formed by connecting in an air-tight manner a high temperature generator to be heated by a high temperature heat source, a first low temperature generator to be heated by refrigerant vapor separated from a dilute solution in said high temperature generator, a condenser, an evaporator, an absorber, a first heat exchanger and a second heat exchanger by means of refrigerant lines, dilute solution lines and dense solution lines. A second low temperature generator to be heated by a low temperature heat source is disposed between one of the dilute solution lines and one of the dense solution lines so as to communicate with said condenser, whereby the supply of a solution and a fuel to said high temperature generator may be controlled dependent on the heating capacity of said second low temperature generator. Dependent on the low temperature heat source and loads, the operation mode of the absorption refrigerating system may selectively be switched to either a single effect operation, or a double effect operation, or a single effect-double effect combined operation, thereby to realize the effective use of energy and a stable switching operation.