To provide an inexpensive and strong heat exchanger by forming a constant falling liquid film, and also to provide a compact and high performance absorption refrigerating machine using it.
In this heat exchanger, a plurality of heat exchanger pipes 3 having a shape to be bent at an intermediate part of the pipe for reversing a flow direction are stacked in an upward and downward direction with the bent shapes at the intermediate parts sequentially changed in a manner that an inner face and an outer face of the pipes 3 are almost brought into close contact with each other, so as to form a heat exchanger pipe unit 4. The units 4 are arranged in a horizontal direction at predetermined intervals, so that heats are exchanged between in-pipe fluid flowing inside the pipe 3 and out-pipe fluid flowing outside the pipe 3. Both ends of the pipe 3 are jointed with a pipe plate or a header for in-pipe fluid. Outside dimension at both ends of the pipe 3 is smaller than outside dimension of a center of the pipe 3. The outer surface of the pipe 3 had better to be applied with a hydrophilic treatment for improving wettability. In this absorption refrigerating machine, the heat exchanger is used for at least one of facilities constituting the absorption refrigerating machine.
MURATA JUN
ISHIYAMA TAKESHI
MATSUBARA TOSHIO
ITO OSAMU
MORI KIKUICHI
KUNIMASA KOICHI
ISHII HIROSHI
IMOTO YUKIO
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