AIR CONDITIONER HAVING THE COOLANT CIRCUIT WITH ACTIVE HEAT RECOVERY FUNCTION OF EXHAUST GAS

摘要

PURPOSE: An air-conditioner equipped with a cooling-water circulation circuit with active exhaust waste gas heat recovery function is provided to improve the efficiency of a system by selectively passing engine refrigerant through an exhaust gas-cooling water heat exchanger according to the driving state of the air-conditioner. CONSTITUTION: An air-conditioner equipped with a cooling-water circulation circuit comprises a first three-way valve(V1) which is installed in a cooling water discharge line(21) and switches the direction of cooling water flow according to the temperature of engine coolant, a first engine return line(23), a second engine return line(27), a second three-way valve(V2), a radiator(40) which is installed in a cooling water line(24) extended from one connecting port of the second three-way valve and cools the cooling water by heat-exchanging with air and wherein an outlet line of the radiator is connected to the second engine return line, and a cooling water-refrigerant heat exchanger(50) which is installed in a cooling water line(25) extended from another connecting port of the second three-way valve and heat-exchanges with refrigerant and wherein an outlet line(26) of the cooling water-refrigerant heat exchanger is connected to the second engine return line. A first branch line(28) and a second branch line are formed between the second engine return line and the engine. One line among the first branch line and the second branch line is directly connected to the cooling water inlet of the engine. The other line is connected via an exhaust gas-cooling water heat exchanger to the cooling water inlet of the engine.