Heat exchanger

Abstract

A spiral heat-transfer pipe for heat exchange provided in a heat exchanger includes: an upstream heat-transfer pipe section disposed on an upstream side of a flow path of an external fluid flowing outside the spiral heat-transfer pipe; and a downstream heat-transfer pipe section disposed on a downstream side of the flow path. Each of the heat-transfer pipe sections is disposed so as to extend in a direction crossing the flow path of the external fluid. Each of an axis of the upstream heat-transfer pipe section and an axis of the downstream heat-transfer pipe section is tilted with respect to a horizontal plane. Also, the axis of the upstream heat-transfer pipe section crosses the axis of the downstream heat-transfer pipe section.

1 . A heat exchanger comprising:
 a heat-transfer pipe for heat exchange,   wherein the heat exchanger is configured such that heat exchange is performed between an external fluid flowing outside the heat-transfer pipe and the heat-transfer pipe, the heat-transfer pipe being a spiral heat-transfer pipe having a spiral shape,   wherein the spiral heat-transfer pipe includes:
 an upstream heat-transfer pipe section disposed on an upstream side of a flow path of the external fluid in a direction crossing the flow path; and 
 a downstream heat-transfer pipe section disposed on a downstream side of the flow path in a direction crossing the flow path, and 
   wherein each of an axis of the upstream heat-transfer pipe section and an axis of the downstream heat-transfer pipe section in the spiral heat-transfer pipe is tilted with respect to a horizontal plane, and also is relatively tilted with respect to the other of the axes, so that the axis of the upstream heat-transfer pipe section crosses the axis of the downstream heat-transfer pipe section.   
     
     
         2 . The heat exchanger according to  claim 1 , further comprising:
 a housing space for housing the spiral heat-transfer pipe, wherein the heat exchanger is configured such that the external fluid is discharged after flowing through the housing space, to thereby perform heat exchange between the external fluid and an internal fluid flowing inside the spiral heat-transfer pipe.   
     
     
         3 . The heat exchanger according to  claim 2 , wherein a plurality of the spiral heat-transfer pipes are housed in the housing space so as to form multiple spirals. 
     
     
         4 . The heat exchanger according to  claim 3 , wherein each of the plurality of the spiral heat-transfer pipes is relatively shifted with respect to the other spiral heat-transfer pipes in a predetermined direction. 
     
     
         5 . The heat exchanger according to  claim 3 , wherein the plurality of the spiral heat-transfer pipes are stacked in a direction crossing a flowing direction of the external fluid so as to form multiple spirals. 
     
     
         6 . The heat exchanger according to  claim 4 , wherein each of the plurality of the spiral heat-transfer pipes is relatively shifted with respect to the other spiral heat-transfer pipes in a direction crossing a neighboring direction of the spiral heat-transfer pipes. 
     
     
         7 . The heat exchanger according to  claim 4 , wherein, at least in a relationship between two most neighboring spiral heat-transfer pipes, one of the spiral heat-transfer pipes is located upstream from the other in the flow path of the external fluid, so that the two spiral heat-transfer pipes are relatively shifted with respect to each other. 
     
     
         8 . The heat exchanger according to  claim 4 , wherein the each of the plurality of the spiral heat-transfer pipes is relatively shifted with respect to the other spiral heat-transfer pipes in the flowing direction of the external fluid. 
     
     
         9 . The heat exchanger according to  claim 1 , wherein when the spiral heat-transfer pipe is projected from the upstream side toward the downstream side of the flow path of the external fluid, the axis of the upstream heat-transfer pipe section and the axis of the downstream heat-transfer pipe section cross each other in a projected plan view.