ABSORPTION WATER COOLING/HEATING MACHINE

PROBLEM TO BE SOLVED: To provide a small-sized and less-expensive absorption water cooling/heating machine having a configuration in which changing-over of a heating operation to a cooling operation is performed rapidly. SOLUTION: The operation of an absorption water cooling/heating machine 100 is changed over such that absorbing liquids 2a, 2b, 24a and 24b are circulated, a cooling operation and a heating operation for cooling and heating cold water/hot water returning water 35a passing through a heat exchanging pipe 26B of an evaporator 26 are changed over. During a cooling operation, the cooling water 32a is circulated through passages of a cooling pipe 1A, a cooling pipe B23A, and a thermal radiation and cooling section 51. A small storing tank 71 is arranged at a lower position than the cooling pipes 1B and 23A. When the operation is shifted to a heating operation, an opening or closing valve V7 is opened, the cooling water 32a in the cooling pipes 1B, 23A is stored in the storing tank 71 due to a difference in drop and then the cooling pipes 1B and 23A are made empty. When the operation is shifted to a cooling operation, the open/close valve V7 is closed, an opening or closing valve V8 is opened to cause the cooling water 32a in the storing tank 71 to be returned back into either the storing tank 59A or a pump 2. Since the storing and returning of cooling water 32a are carried out by a drop difference, a fluid driving device such as a pump or the like can be eliminated and its small-sized and less-expensive configuration can be realized.