Precisely Drawn Carbon Steel Tubes, Small Diameter Tubes, Revolutionary High Performance Double-Tube Heat Exchanger

Change To High Performance Heat ExchangecThe Nishiyama Double-Tube Heat Exchanger!

Why The Multi-Petal Double Tube Is Superior, 
Capillary Insert Tube Until now, machinery requiring heat exchange has relied on a plate-style product or a smaller internal tube surrounded by a larger external tube. Unfortunately though, to increase heat exchange with these products has meant extending tube length or widening tube diameters. The outcome of both these options was to hinder internal flow speeds and thermal conduction efficiency.
Nishiyama created the solution by developing the Multi-Petal Double Tube, which greatly increases surface area and therefore heat exchange efficiency without need for widening or lengthening. Continuing the search for high performance, low energy solutions, Nishiyama developed the Capillary Insert Tube.

Application Examples Of The Multi-Petal Double Tube

Conventional Tube Design, 
Nishiyama Tube Design)  Without increasing comparative flow spaces (corresponding tube diameters), the Multi-Petal Double Tube vastly increases the surface area contact between the inner tube flow and the outer tube flow. The resulting heat exchange efficiency, and therefore performance realized by this design is more than double that of conventional heat exchange tubes.


Mutli-Petal Double Tube Characteristics

Variety of internal tube Graph
EContact Surface Area Comparison
EDouble Tube Heat Exchange Capacity
Edge of tube


  • Heat exchange surface area is vastly increased allowing the same degree of heat exchange performance by much smaller, lighter tubes.
  • A wide variety of internal tube shape alternatives allows for corresponding tube wall diameter and tube wall thickness reductions.
  • The connecting process of inner and outer tubes is simple as both originate from round tubes.


Application Examples

Product
  1. Heat exchanger tubes for Eco-Cute environmental hot water heating systems (which use the natural heat carried by CO2 molecules in the atmosphere)
  2. Heat exchanger tubes for gas hot water heating systems
  3. Heat exchanger tubes for cogeneration exhaust components as well as electric motor exhaust components
  4. Heat exchanger tubes for EGR cooler fans cooling diesel exhaust

Capillary Insert Tubes For Heat Exchanger Components

cross section view
Edge of tube
  1. Capillary Insert tubes are used in applications where heat is exchanged around fully internalized systems where contents return to the source. Capillaries and main tubes are therefore, the same metal and 100% recycle recovery of contents is possible.
  2. The supple nature of the tubes mean a much wider variety of plumbing shapes are possible.

Application Examples

Product
  1. Heat exchanger tubes for Eco-Cute environmental hot water heating systems
  2. Fridges and freezers.
    The application of Capillary Insert tubes in fridges/freezers means heat exchange can now be achieved in less space, allowing manufacturers greater internal space in the same unit.