Waste Heat Utilization Device for Internal Combustion Engine

Abstract

A waste heat utilization device for an internal combustion engine ( 2 ) comprising a cooling water circuit ( 4 ) including a radiator ( 12 ) for cooling cooling-water by means of outside air drawn to pass through the radiator, a Rankine cycle ( 6 ) including a first condenser ( 24 ) for condensing a refrigerant, and a refrigeration cycle ( 8 ) including a second condenser ( 36 ) for condensing a refrigerant, wherein the first and second condensers ( 24, 36 ) are water-cooled heat exchangers, and the waste heat utilization device includes a water circuit ( 44 ) including an air-cooled heat exchanger ( 46 ) for cooling water that has passed through the first and second condensers ( 24, 36 ), by means of outside air drawn to pass through the air-cooled heat exchanger, and a heat exchange unit composed of the air-cooled heat exchanger ( 46 ) and the radiator ( 12 ).

1 . A waste heat utilization device for an internal combustion engine, comprising a cooling water circuit including a radiator for cooling cooling-water that has been heated by waste heat produced by the internal combustion engine, by means of outside air drawn to pass through the radiator, a Rankine cycle including an expansion machine for expanding a refrigerant that has been heated by said cooling water, thereby producing drive power and a first condenser for condensing the refrigerant that has passed through the expansion machine, and a refrigeration cycle including a compressor for compressing a refrigerant that has been heated by a heat source and a second condenser for condensing the refrigerant that has passed through the compressor, wherein
 the first and second condensers are water-cooled heat exchangers, and   the waste heat utilization device includes a water circuit including a air-cooled heat exchanger for cooling water that has passed through the first and second condensers, by means of outside air drawn to pass through the air-cooled heat exchanger, and   a heat exchange unit composed of said air-cooled heat exchanger and said radiator.   
     
     
         2 . The waste heat utilization device for the internal combustion engine according to  claim 1 , wherein said water circuit is configured such that the first and second condensers are connected in parallel to the air-cooled heat exchanger and includes a flow distribution means for distributing water flow to the first and second condensers in proportions depending on refrigerant condensing abilities required by the Rankine cycle and the refrigeration cycle. 
     
     
         3 . The waste heat utilization device for the internal combustion engine according to  claim 1 , wherein said water circuit is configured such that the first and second condensers are connected in series to the air-cooled heat exchanger, where the second condenser is before the first condenser in the direction of water flow toward the air-cooled heat exchanger. 
     
     
         4 . The waste heat utilization device for the internal combustion engine according to  claim 1 , wherein said first and second condensers are integrated. 
     
     
         5 . The waste heat utilization device for the internal combustion engine according to  claim 1 , wherein said heat exchange unit is constructed such that the radiator is arranged behind the air-cooled heat exchanger in the direction of outside air drawn into them. 
     
     
         6 . The waste heat utilization device for the internal combustion engine according to  claim 1 , wherein said heat exchange unit is constructed such that the radiator and the air-cooled heat are arranged side by side in a direction substantially perpendicular to the direction of outside air drawn into them and integrally connected. 
     
     
         7 . The waste heat utilization device for the internal combustion engine according to  claim 6 , wherein said heat exchange unit includes a blower for controlling the respective amounts of out side air drawn into the air-cooled heat exchanger and the radiator, independently. 
     
     
         8 . The waste heat utilization device for the internal combustion engine according to  claim 6 , wherein the heat exchange unit includes heat exchange sections constituting the air-cooled heat exchanger and the radiator, respectively, in which heat transfer takes place independently, and a shared heat exchange section used as a supplementary section to either one of the heat exchange sections. 
     
     
         9 . The waste heat utilization device for the internal combustion engine according to  claim 8 , wherein the heat exchange unit includes a flow path change means for changing a water flow path to cause the shared heat exchange section to function as a supplementary section to either one of the heat exchange sections. 
     
     
         10 . The waste heat utilization device for the internal combustion engine according to  claim 8 , wherein the heat exchange unit includes a plurality of shared heat exchange sections.