Da Vinci Co., Ltd

Technology & Product


Technology converting waste heat into useful energy results is energy-saving.  In industrial settings or in the use of machinery, heat is usually generated as a result of energy loss. Then, Technology converting waste heat into useful energy is very important mission. Governments around the world are encouraging companies and individuals to use heat-recovery systems. Many companies have useful ideas which are not yet transformed into the availability of products for end-users. Therefore, heat recovery systems in development and with promise are important technologies leading to improve the efficiency of utilizing energy.

Since 1991, we have researched and developed heat related technologies such as heat exchange, heat transfer, heat structure designing, etc. Since 2000, Da Vinci has endeavored to solve the problem of "heat recovery". As a result, we have developed Seebeck devices (heat-to-electricty converting devices), and the Rotary Heat Engine driven by Rankine cycle utilizing two phases (gas and liquid).

Let us introduce our technology and product in detail below.

Rotary Heat Engine (RHE)

Rotary Heat Engine (RHE) is Wankel-based Rotary Engine specified outside combustion driven by the Rankine cycle.  Combining a generator with RHE enables us to efficiently convert waste heat into electricity.  RHE is expected to deter global warming because it reduces the consumption of fossil fuels and lowers carbon emissions.
(Patent pending, collaborated with The University of Tokyo)

Please refer to our RHE page for more detailed information.


Dual Peltier Module

The Peltier effect is normally used to pump heat. By combining two Peltier modules in a dual layer, large temperature-differences can be obtained.  As a result, more electricity can be produced more efficiently.

Detailed specification information is here. (Patent is pending)

Seebeck Devices

Seebeck devices are used to generate electricity, in contrast to the Peltier effect.  Peltier effects means, when two different metals or semiconductors connect together and conduct electricity, one gives off cold, while the other gives off heat. In Seebeck effects, on the other hand, electricity is generated by adding different temperature to these disparate materials.  We are developing Seebeck devices capable of generating 1 watts of electric power with 30 degrees C temperature differences.
(Patent pending, collaborated with Ondosa Hatsuden Kenkyu Kai (a research of focusing on Temperature Difference Power Generation))


Magnetic Heat Pump

Magnetic Heat Pump is a heat transfer device making the most use of the features of magnetic fluid. We are developing Magnetic Heat Pump which is capable of transferring heat six times as a copper. Detailed information is here.
(Two patent applications filed, one patent is granted in Japan, the other is pending.
collaborated with The University of Tokyo)