Heat exchanging device and water heater using the same

Abstract

A heat exchanging device, for performing a heat exchange between a first fluid and a second fluid is provided, includes a first pipe and a second pipe. The first pipe includes a first inlet and a first outlet thereby allowing the first fluid to flow in and out the first pipe through the first inlet and the first outlet, respectively. The second pipe includes a second inlet and a second outlet thereby allowing the second fluid to flow in and out the second pipe through the second inlet and the second outlet, respectively. The first pipe and the second pipe are contacted with each other by being disposed in a juxtaposition manner; and a flowing direction of the first fluid in the first pipe is opposite to a flowing direction of the second fluid in the second pipe. A water heater using the heat exchanging device is also provided.

What is claimed is: 
     
         1 . A heat exchanging device configured to perform a heat exchange between a first fluid and a second fluid, the heat exchanging device comprising:
 a first pipe, comprising a first inlet and a first outlet thereby allowing the first fluid to flow in and out the first pipe through the first inlet and the first outlet, respectively; and   a second pipe, comprising a second inlet and a second outlet thereby allowing the second fluid to flow in and out the second pipe through the second inlet and the second outlet, respectively,   wherein the first pipe and the second pipe are contacted with each other by being disposed in a juxtaposition manner, a flowing direction of the first fluid in the first pipe is opposite to a flowing direction of the second fluid in the second pipe.   
     
     
         2 . The heat exchanging device according to  claim 1 , wherein both of the first and second pipes are oval-shaped pipes, the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other in an extending direction of a short axis of each oval-shaped pipe. 
     
     
         3 . The heat exchanging device according to  claim 1 , wherein both of the first and second pipes are polygon-shaped pipes, the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other. 
     
     
         4 . The heat exchanging device according to  claim 1 , wherein the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other, the first contact surface comprises at least a recess, the second contact surface comprises at least a protrusion, the recess and the protrusion are contacted with each other. 
     
     
         5 . The heat exchanging device according to  claim 1 , wherein the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other, the first contact surface comprises at least a protrusion, the second contact surface comprises at least a recess, the recess and the protrusion are contacted with each other. 
     
     
         6 . The heat exchanging device according to  claim 1 , wherein both of the first and second pipes have winding-and-bending structures. 
     
     
         7 . The heat exchanging device according to  claim 1 , further comprising an insulating layer configured to wrap the first and second pipes. 
     
     
         8 . The heat exchanging device according to  claim 1 , further comprising:
 a container, wherein the first and second pipes are disposed in the container; and   an insulating layer, disposed in the container and configured to wrap the first and second pipes.   
     
     
         9 . A water heater, comprising:
 a heat exchanging device, comprising a first pipe and a second pipe, wherein the first pipe comprises a first inlet and a first outlet thereby allowing a first fluid to flow in and out the first pipe through the first inlet and the first outlet, respectively, wherein the second pipe comprises a second inlet and a second outlet thereby allowing a second fluid to flow in and out the second pipe through the second inlet and the second outlet, respectively, wherein the first pipe and the second pipe are contacted with each other by being disposed in a juxtaposition manner, a flowing direction of the first fluid in the first pipe is opposite to a flowing direction of the second fluid in the second pipe; and   a heating unit, connected between the first outlet and the first inlet of the first pipe of the heat exchanging device.   
     
     
         10 . The water heater according to  claim 9 , wherein both of the first and second pipes are oval-shaped pipes, the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other in an extending direction of a short axis of each oval-shaped pipe. 
     
     
         11 . The water heater according to  claim 9 , wherein both of the first and second pipes are polygon-shaped pipes, the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other. 
     
     
         12 . The water heater according to  claim 9 , wherein the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other, the first contact surface comprises at least a recess, the second contact surface comprises at least a protrusion, the recess and the protrusion are contacted with each other. 
     
     
         13 . The water heater according to  claim 9 , wherein the first pipe comprises a first contact surface, the second pipe comprises a second contact surface, the first contact surface and the second contact surface are contacted with each other, the first contact surface comprises at least a protrusion, the second contact surface comprises at least a recess, the recess and the protrusion are contacted with each other. 
     
     
         14 . The water heater according to  claim 9 , wherein the both of the first and second pipes have winding-and-bending structures. 
     
     
         15 . The water heater according to  claim 9 , further comprising an insulating layer configured to wrap the first and second pipes. 
     
     
         16 . The water heater according to  claim 9 , further comprising:
 a container, wherein the first and second pipes are disposed in the container; and   an insulating layer, disposed in the container and configured to wrap the first and second pipes.   
     
     
         17 . The water heater according to  claim 9 , further comprising a receptacle configured to receive the second fluid flowing out from the second outlet of the second pipe.