Masaaki Itoh

TL;DR: In this article, a heat transfer pipe for use in a heat exchanger such as air conditioner, freezer and boiler, wherein grooves are formed in the inner wall surface of the pipe, which are by far finer in size than the grooves that have been provided for the purpose of increasing the heat transfer area in general, and slanting relative to the axis of pipe, to thereby improve the heat transmission rate without increasing the pressure loss caused to the fluid flowing through the pipe.

TL;DR: A fin-tube type heat exchanger has parallel heat transfer tubes and a stack of a plurality of plate fins mounted on the tubes as mentioned in this paper, where heat exchange is conducted between a first fluid flowing through the tubes and another fluid flowing across each of the fins.

TL;DR: In this article, a fin-and-tube type heat exchanger is disclosed in which the height of each raised, slotted louver from a fin base portion continuously changes in a direction crossing at right angles both the direction of the air flow and lamination of fins, and two or three kinds of such louver pairs, each consisting of louvers symmetric with each other with respect to the fin base part, are arranged regularly.

TL;DR: In this article, a simple equation for calculating condensation heat transfer coefficients of pure refrigerants in horizontal micro-fin tubes is proposed, and two new parameters, i.e., the Bond number and the area ratio, are introduced in order to describe this complex heat transfer mechanism.