Air conditioning apparatus for vehicle

An air conditioning apparatus for a vehicle having a passenger compartment and an engine for driving the vehicle, said air conditioning apparatus comprising:

• a duct for forming an air passage for leading air toward the passenger compartment;
• a blower, disposed in the air passage, for blowing air within said duct toward the passenger compartment;
• a refrigerant cycle including
• a compressor for compressing refrigerant, said compressor having a first compression portion for compressing gas refrigerant sucked from an intake port thereof from a low pressure to an intermediate pressure, and a second compression portion for compressing refrigerant from said first compression portion and from an injection port thereof and for discharging the compressed refrigerant from an outlet port thereof,
• a water/refrigerant heat exchanger for exchanging heat between gas refrigerant discharged from said compressor and cooling water for cooling the engine, to heat the cooling water,
• a condenser for condensing and cooling refrigerant from said water/refrigerant heat exchanger by performing heat-exchange between the refrigerant from said water/refrigerant heat exchanger and outside air outside the vehicle,
• a first press-reducing unit for reducing a pressure of liquid refrigerant to an intermediate pressure, the liquid refrigerant being condensed in at least one of said water/refrigerant heat exchanger and said condenser,
• a cooling unit for cooling a heat-generating unit mounted on the vehicle, using the intermediate-pressure refrigerant from said first press-reducing unit,
• a gas-liquid separator, disposed at a downstream refrigerant side of said cooling unit, for separating liquid refrigerant and gas refrigerant,
• a second press-reducing unit for reducing a pressure of liquid refrigerant from said gas-liquid separator,
• an evaporator disposed in said air passage, for evaporating refrigerant flowing from said second press-reducing unit by heat from air to cool air, and
• a gas refrigerant passage through which gas refrigerant from said gas-liquid separator is introduced into the injection port of said second compression port;
• and
• a cooling water cycle in which the cooling water circulates, said cooling water cycle includes
• a heater core, disposed in said air passage at a downstream air side of said evaporator, for performing heat-exchange between the cooling water and air to heat air,
• a radiator for cooling the cooling water by performing heat-exchange between the cooling water and outside air, and
• a pump for circulating the cooling water in said cooling water cycle,
• wherein said water/refrigerant heat exchanger and the engine are disposed in said cooling water cycle.

An air conditioning apparatus for a vehicle having a passenger compartment and an engine for driving the vehicle, said air conditioning apparatus comprising:

• a duct for forming an air passage for leading air toward the passenger compartment;
• a compressor for compressing refrigerant;
• a water/refrigerant heat exchanger for exchanging heat between the refrigerant discharged from said compressor and cooling water for cooling the engine, to heat the cooling water;
• a condenser for condensing and cooling refrigerant from said water/refrigerant heat exchanger by performing heat-exchange between the refrigerant from said water/refrigerant heat exchanger and outside air outside the vehicle;
• a first press-reducing unit for reducing a pressure of liquid refrigerant to an intermediate pressure, the liquid refrigerant being condensed in at least one of said water/refrigerant heat exchanger and said condenser;
• a cooling unit for cooling a heat-generating unit mounted on the vehicle, using the intermediate-pressure refrigerant from said first press-reducing unit;
• a second press-reducing unit for reducing a pressure of the intermediate-pressure refrigerant from said cooling unit;
• an evaporator disposed in said air passage, for evaporating refrigerant flowing from said second press-reducing unit by heat from air to cool air to be blown the passenger compartment;
• a heater core, disposed in said air passage at a downstream air side of said evaporator, for performing heat-exchange between the cooling water and air to heat air to be blown toward the passenger compartment;
• and
• a radiator for cooling the cooling water by performing heat-exchange between the cooling water and outside air, wherein:
• the cooling water from said radiator flows into said heater core through said water/refrigerant heat exchanger while said cooling unit cools the heat-generating unit using the intermediate-pressure refrigerant, when a cooling mode for cooling the passenger compartment is set;
• and
• the cooling water heated in said water/refrigerant heat exchanger directly flows into said heater core, when a heating mode for heating the passenger compartment is set.