Abstract: Provided are a tube type heat exchanger and a method of the tube type heat exchanger capable of preventing spiral fins 12 from being deformed. In the tube type heat exchanger and the manufacturing method of the same according to the present invention, the plural spiral fins 12 are disposed in series in the axial direction so as to have edges of the spiral fins 12, 12 spaced apart from each other, and each holder 3 is disposed between the spiral fins 12, 12 and abuts to the outer circumference of the tube body 11.

Abstract: It is an object to provide a finned tube type heat exchanger (spiral tube fin heat exchanger) capable of having a reduced size and having an increased heat exchange efficiency and, therefore, an increased performance. A spiral tube fin heat exchanger includes a plurality of heat transfer tubes that allow a heat exchanging object to flow therein and each including a radially-extending tube fin on an outer peripheral surface thereof, the plurality of heat transfer tubes being arranged to be oriented in an identical direction, wherein the tube fin has a spiral shape and has a spiral axis being coincident with a center axis of each of the heat transfer tubes, and the plurality of heat transfer tubes are arranged such that tip ends of tube fin portions in one of adjacent heat transfer tubes intrude between tube fin portions in the other one of adjacent heat transfer tubes.

Abstract: A light warning apparatus includes a strobe light source, a reflecting mirror that reflects light from the strobe light source, and lens that covers the strobe light source and the reflecting mirror, and a tinted coating layer is formed on the surface of the reflecting mirror. In addition, a colored light signaling device includes a tinted lens cover and a colored reflecting mirror coupled to the lens cover. A strobe light emitting device adapted to provide a sequence of flashing light is disposed in relation to the reflecting mirror so that the light is distributed in a predetermined pattern. The colored reflecting mirror provides a polar light distribution of the flashing light.