Abstract: Provided are a layered heat exchanger that can prevent deterioration of sealing property due to deformation of sealing portions of inlet and outlet header sections when a PTC heater is sandwiched between flat heat exchanger tubes, and is pressed to be brought into close contact with the flat heat exchanger tubes, and a heat medium heating apparatus and a vehicle air-conditioning apparatus using the layered heat exchanger.

Abstract: Provided are a layered heat exchanger that can prevent deterioration of sealing property due to deformation of sealing portions of inlet and outlet header sections when a PTC heater is sandwiched between flat heat exchanger tubes, and is pressed to be brought into close contact with the flat heat exchanger tubes, and a heat medium heating apparatus and a vehicle air-conditioning apparatus using the layered heat exchanger.

Abstract: A refrigerant evaporator is provided in which a liquid refrigerant can be evenly distributed to a plurality of refrigerant tubes connected to first and second tanks in a U-turn block to improve heat-exchange performance. In the refrigerant evaporator, one of a plurality of blocks into which a refrigerant supply channel is divided is a U-turn block where a refrigerant flows into one of the first and second tank portions of an upper tank in a direction along a partition wall, flows into the other tank portion, and is distributed and flows from the first and second tank portions into a plurality of refrigerant tubes. The partition wall partitioning the first and second tank portions of the upper tank has a plurality of refrigerant-distributing holes arranged in a longitudinal direction of the partition wall in the U-turn block so that the first tank portion communicates with the second tank portion.

Abstract: An object is to provide a refrigerant evaporator in which a liquid refrigerant can be evenly distributed to a plurality of refrigerant tubes connected to first and second tanks in a U-turn block to improve heat-exchange performance. In the refrigerant evaporator, one of a plurality of blocks into which a refrigerant supply channel is divided is a U-turn block (15) where a refrigerant flows into one of the first and second tank portions (6, 7) of an upper tank (4) in a direction along a partition wall (4C), flows into the other tank portion, and is distributed and flows from the first and second tank portions (6, 7) into a plurality of refrigerant tubes (2). The partition wall (4C) partitioning the first and second tank portions (6, 7) of the upper tank (4) has a plurality of refrigerant-distributing holes (4M) arranged in a longitudinal direction of the partition wall (4C) in the U-turn block (15) so that the first tank portion (6) communicates with the second tank portion (7).