Double-effect absorption refrigeration system

摘要

PROBLEM TO BE SOLVED: To prevent a capability of freezing device from being reduced at an initial time of cooling operation, shorten a diluting operation time at the end of cooling operation and eliminate a circulation of absorbing liquid during an absorbing cycle when a heating operation is carried out. SOLUTION: An absorbing liquid of a low concentration is separated into an absorbing liquid of a middle concentration and a refrigerant by a high temperature regenerator 1 heated by a gas burner B, the absorbing liquid of the middle concentration is separated into an absorbing liquid of a high concentration and the refrigerant by a low temperature regenerator 2, a refrigerant liquid is dispersed in an evaporating coil 41 of an evaporator 4 to cool cold water within the evaporating coil 41 of the evaporator 4, the absorbing liquid of the high concentration is dispersed in a cooling coil 31 of an absorbing device 3, the refrigerant is absorbed to produce an absorbing liquid of a low concentration and further it is returned back to the high temperature regenerator 1 by an absorbing liquid pump P1. A bottom section 24 of a high concentration absorbing liquid receiving section 23 of the low temperature regenerator 2 and a bottom section 33 of the absorbing device 3 are connected by a high concentration absorbing liquid bypass flow passage 62 and then a bypass valve 61 is controlled to be opened at an initial time of cooling operation, an end of cooling operation and a heating time. When the bypass valve 61 is opened, the high concentration absorbing liquid in the low temperature regenerator 2 is flowed into the absorbing device 3.