AIR CONDITIONING SYSTEM


  1. CONSTRUCTION


    1. Front Evaporator


      1. Beneficial Refrigerant Stream (BRS) Type Evaporator


        • The Beneficial Refrigerant Stream (BRS) type evaporator is used on models with a 2GR-FE engine.

        • The Beneficial Refrigerant Stream (BRS) type evaporator is composed of tanks, tubes and cooling fins. The tubes project outwards and are shaped as a fine duct in an attempt to offer superior conductivity with a narrower width. Furthermore, the evaporator has been drastically miniaturized and lightened through efforts to promote conductivity through shrinking the fin height, tube thickness and fin pitch, as well as by thinning the core material.

        • The route that refrigerant passes through within the evaporator is optimized and pressure losses are reduced in an effort to increase performance and decrease size.

          B006JVEC01
          *1 Tank *2 Cooling Fin
          *3 Tube - -

        • While flowing through the evaporator tubes, refrigerant exchanges heat and vaporizes from a mist state.

        • As shown in the illustration below, the proportion of tubes through which refrigerant flows increases as the direction the refrigerant flows in changes. This makes it easier for refrigerant to flow and decreases pressure losses.

          B006K03E01

      2. Cold Storage Type Evaporator


        • The cold storage type evaporator is used on models with a 2AR-FE engine.

        • The cold storage type evaporator is composed of tanks, tubes, cooling fins and cold storage cases.

        • The cold storage cases with built-in cold insulators are structures sandwiched between tubes used as refrigerant passages and can store cold energy in a short amount of time.

          B006K4UC01
          *1 Cold Insulator *2 Cold Storage Case
          *3 Tube - -
          *a A-A Cross Section - -

    2. Rear Evaporator


      1. A Revolutionary super-slim Structure (RS) type evaporator is used. Placing the tanks at the top and the bottom of the evaporator and using a micropore tube construction provides the following benefits:


        • Improved heat exchange efficiency

        • More uniform temperature distribution

        • A thinner evaporator
        B006K9PC01
        *1 Tank *2 Cooling Fin
        *3 Tube - -

  2. OPERATION


    1. Cold Storage Type Evaporator


      1. When the engine is running, the refrigerant cools air blown by the system and the cold insulator inside the cold storage cases. The cold insulator stores the cold energy from the refrigerant.

      2. When the engine is stopped according to stop and start control, cold energy accumulated in the cold insulator cools air blown by the system and suppresses temperature increases in the air outlet temperature.

        B006KCMC01
        *1 Tube *2 Cold Storage Case
        *3 Refrigerant *4 Cold Insulator
        *a When in Motion (Air Conditioning Compressor Operating) *b Air Blown by System
        *c Refrigerant Cools Air Blown by System and Cold Insulator *d When Stopped (Engine Stopped)
        *e Accumulated Cold Energy Cools Air Blown by System - -

      3. Engine restarts according to requests from air conditioning control are reduced by suppressing temperature increases in the air outlet temperature.

        B006KC3E03