In one aspect, the present subject matter discloses a seal including a substrate material. The evaporation side heat pipe and the condensation side heat pipe are connected to form a closed cycle, and the evaporation side heat pipe is arranged such that the working fluid flows in the evaporation side heat pipe in a direction different from a horizontal direction. Two other longitudinal hollow members are positioned substantially parallel to and on either side of the first longitudinal hollow member and are connected to the first longitudinal hollow member.