Heating, Ventilation and/or Air Conditioning System Including Four Heat Exchangers

Abstract

The invention relates to a heating, ventilating and/or air conditioning device ( 1 ) comprising an A/C loop ( 6 ) inside which a refrigerating fluid FR circulates and a secondary loop ( 10 ) inside which a cooling fluid FC circulates. The said device ( 1 ) comprising a first heat exchanger ( 8 ) between the refrigerating fluid FR and the cooling fluid FC, a second heat exchanger ( 9 ) between the refrigerating fluid FR and the cooling fluid FC. The secondary loop comprises a third heat exchanger ( 14 ) between the cooling fluid FC and the air, and a fourth heat exchanger ( 15 ) between the cooling fluid FC and the air. The secondary loop ( 10 ) comprises derivation means ( 22 ) of the cooling fluid FC from an outlet point ( 21 ) of the cooling fluid FC outside the third heat exchanger ( 14 ) and an inlet point ( 23 ) of the cooling fluid FC inside the fourth heat exchanger ( 15 ).

1 . A heating, ventilation and/or air conditioning system ( 1 ) including an air conditioning loop ( 6 ) inside of which a coolant FR circulates, and a secondary loop ( 10 ) inside of which a heat transfer fluid FC circulates; said system ( 1 ) comprising a first heat exchanger ( 8 ) between the coolant FR and the heat transfer fluid FC, and a second heat exchanger ( 9 ) between the coolant FR and the heat transfer fluid FC; the secondary loop ( 10 ) includes a third heat exchanger ( 14 ) between the heat transfer fluid FC and the air, and a fourth heat exchanger ( 15 ) between the heat transfer fluid FC and the air, characterized in that the secondary loop ( 10 ) includes at least one bypass ( 22 ) of the heat transfer fluid FC from an outlet point ( 21 ) for the heat transfer fluid FC leaving the third heat exchanger ( 14 ) to an inlet point ( 23 ) for the heat transfer fluid FC entering the fourth heat exchanger ( 15 ). 
     
     
         2 . A system ( 1 ) according to  claim 1 , characterized in that the outlet point ( 21 ) is connected to a mid-point ( 26 ) located on the secondary loop ( 10 ) between the first heat exchanger ( 8 ) and the second heat exchanger ( 9 ). 
     
     
         3 . A system ( 1 ) according to  claim 2 , characterized in that the bypass ( 22 ) comprises a “Y” channel, including an inlet E for the heat transfer fluid FC, which is connected to the outlet point ( 21 ), a first outlet S 1 , which is connected to the mid-point ( 26 ) and a second outlet S 2 , which is connected to an inlet point ( 23 ) for the heat transfer fluid FC entering the fourth heat exchanger ( 15 ). 
     
     
         4 . A system ( 1 ) according to  claim 1 , characterized in that the first heat exchanger ( 8 ) is arranged upstream of the second heat exchanger ( 9 ) according to a direction of circulation ( 11 ) of the coolant FR inside the air conditioning loop ( 6 ). 
     
     
         5 . A system ( 1 ) according to  claim 1 , characterized in that the third heat exchanger ( 14 ) comprises an inlet point ( 19 ) for the heat transfer fluid FC, which is in fluidic communication with a discharge orifice ( 20 ) for the heat transfer fluid FC leaving the first heat exchanger ( 8 ). 
     
     
         6 . A system ( 1 ) according to  claim 5 , further comprising first means for maintaining a first flow rate of the heat transfer fluid FC, between the inlet point ( 19 ) and the outlet point ( 21 ), at between 120 l/h and 300 l/h. 
     
     
         7 . A system ( 1 ) according to  claim 6 , characterized in that the first maintenance means include an arrangement with at least two passes of a first circulation channel ( 30 ) of the heat transfer fluid FC inside the third heat exchanger ( 14 ). 
     
     
         8 . A system ( 1 ) according to  claim 7 , characterized in that the first maintenance means include an arrangement with at least four passes of the first circulation channel ( 30 ). 
     
     
         9 . A system ( 1 ) according to  claim 6 , characterized in that the first maintenance means include a restriction ( 42 ) of circulation of the heat transfer fluid FC, in which the restriction ( 42 ) is arranged upstream of the intake point ( 23 ). 
     
     
         10 . A system ( 1 ) according to  claim 3 , further comprising second means for maintaining a second flow rate of the heat transfer fluid FC, between the intake point ( 23 ) and a discharge point ( 24 ) for the heat transfer fluid FC leaving the fourth heat exchanger ( 15 ), at between 40 l/h and 120 l/h. 
     
     
         11 . A system ( 1 ) according to  claim 1 , further comprising a first channel ( 35 ) housing the fourth heat exchanger ( 15 ) and at least one first portion ( 37 ) of the third heat exchanger ( 14 ). 
     
     
         12 . A system ( 1 ) according to  claim 11 , characterized in that the first channel comprises an external air supply inlet ( 36 ) in communication with the outside of a vehicle. 
     
     
         13 . A system ( 1 ) according to  claim 11 , further comprising a second channel ( 39 ) comprising a recycling air supply inlet ( 43 ) in communication with a vehicle interior. 
     
     
         14 . A system ( 1 ) according to  13 , characterized in that the second channel ( 39 ) houses a second portion ( 38 ) of the third heat exchanger ( 14 ). 
     
     
         15 . A system ( 1 ) according to  claim 14 , characterized in that the second portion ( 38 ) is indifferently separate from or integral with the first portion ( 37 ).