Air conditioning system for vehicle

Abstract

An air conditioning system includes an air-cooling unit and an air-heating unit. On a first path in the cooling-unit, provided are a compressor for first refrigerant, a condenser for the first refrigerant, an expansion unit for the first refrigerant, and an evaporator to cool air. On a second path in the air-heating unit, provided are an air-conditioning radiator for second refrigerant, and a first valve for the second refrigerant (whether or not into the air-conditioning radiator) On a third path in the air-heating unit, provided are a driving-system heating element to heat third refrigerant, an internal heat exchanger to heat the third refrigerant, a heater core to heat air, a driving-system radiator for the third refrigerant, and a second valve for the third refrigerant (whether or not into the driving-system radiator). The air passing through the evaporator or the heater core is selectably sent into a vehicle compartment.

1 . An air conditioning system for a vehicle, comprising
 a heat-pump type cooling unit including a first circulation path in which first refrigerant circulates and   an air-heating unit including a second circulation path in which second refrigerant circulates and a third circulation path in which a third refrigerant circulates; each of the second and third refrigerants being liquid and capable of taking sensible heat change due to heat-changing,
 wherein, 
 on the first circulation path, provided are
 a compressor for compressing the first refrigerant, 
 a condenser for radiating heat of the first refrigerant to the second refrigerant and also provided on the second circulation path, 
 an expansion unit for expanding the first refrigerant, and 
 an evaporator for heat-exchanging between the first refrigerant expanded by the expansion unit and air to cool the air; 
 
 on the second circulation path, provided are
 a first pump for circulating the second refrigerant, 
 an air-conditioning radiator for radiating heat of the second refrigerant, and 
 a first flow-path changeover unit for changing over the second refrigerant flowing to flow into the air-conditioning radiator or to bypass the air-conditioning radiator; 
 
 on the third circulation path, provided are
 a second pump for circulating the third refrigerant, 
 a driving-system heating element for heat-exchanging with the third refrigerant, 
 an internal heat exchanger for heat-exchanging with the second refrigerant to heat the third refrigerant, 
 a heater core for heat-exchanging between the third refrigerant and air to heat the air, 
 a driving-system radiator for radiating heat of the third refrigerant, and 
 a second flow-path changeover unit for changing over the third refrigerant flowing to flow into the driving-system radiator or to bypass the driving-system radiator based on temperature of the third refrigerant; and 
 
 the system is configured to send the air passing through the evaporator or the air passing through the heater core into a vehicle compartment selectably. 
   
   
   
       2 . The air conditioning system according to  claim 1 , wherein,
 the air-conditioning radiator and the driving-system radiator are provided integrally.   
   
   
       3 . The air conditioning system according to  claim 1 , wherein,
 the internal heat exchanger includes a heat-radiating section and a heat-receiving section,   the heat-radiating section and the heat-receiving section are made coherent, and   the second refrigerant flows through the heat-radiating section and the third refrigerant flows through the heat-receiving section.   
   
   
       4 . The air conditioning system according to  claim 1 , wherein,
 the internal heat exchanger includes a heat exchanger through which at least one of the second and third refrigerants flows and the heat exchanger is provided within a flowing path through which another of the second and third refrigerants flows.   
   
   
       5 . The air conditioning system according to  claim 1 , wherein,
 the internal heat exchanger is a refrigerant-confluent unit into which the second and third refrigerants flow together.   
   
   
       6 . The air conditioning system according to  claim 1 , wherein,
 a third flow-path changeover unit for changing over the second refrigerant flowing to flow into the internal heat exchanger or to bypass the internal heat exchanger, is further provided on the second circulation path.   
   
   
       7 . The air conditioning system according to  claim 1 , wherein,
 a fourth flow-path changeover unit for changing over whether or not to flow the third refrigerant to the internal heat exchanger and the heater core, is further provided on the third circulation path.   
   
   
       8 . The air conditioning system according to  claim 1 , wherein,
 the system is configured to make the third circulation path into two circulation forms selectably,   in one of the circulation forms, the third refrigerant circulates along an integrated circulation path integrally to flow through the driving-system heating element, the driving-system radiator, the heater core and the internal heat exchanger, and   in another of the circulation forms, the third refrigerant circulates respectively along one divided circulation path to flow through the driving-system heating element and the driving-system radiator and another divided circulation path to flow through the heater core and the internal heat exchanger.   
   
   
       9 . The air conditioning system according to  claim 1 , wherein,
 a combined path is provided on the second and third circulation paths and commonly belongs to the second and third circulation paths,   the heater core is provided on the combined path,   the system is configured to make the third circulation path into two circulation forms selectably,   in one of the circulation forms, the third refrigerant circulates along an integrated circulation path integrally to flow through the driving-system heating element, the driving-system radiator, the heater core and the internal heat exchanger, and   in another of the circulation forms, the third refrigerant circulates respectively along one divided circulation path to flow through the driving-system heating element and the driving-system radiator and another divided circulation path to flow through the heater core and the internal heat exchanger.   
   
   
       10 . The air conditioning system according to  claim 1 , wherein,
 a heater is provided on at least one of the second and third circulation paths.