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VonEx Heat Exchangers


We provide our customers with two types of heat exchangers:


Dimensioning a Solution for Your Needs

For a quotation of a Heat Exchanger System, please click here.


Bottlebrush Heat Exchanger


Bottlebrush Heat Exchanger,
Copper - Aluminium

Stainless Steel AISI 316 - Aluminium

The Bottlebrush Heat Exchanger is a High Efficiency, High-Heat-Transmission-Coefficient heat exchanger for demanding industrial and heat recovery applications. The Heat Exchanger has a patent pending.

The Superior Features of

  • The Highest Internal Heat Transmission Coefficient in the markets

  • The Largest Relative Heat Transmission Surface Area in the markets

  • Low Air Resistance and Pressure Drop even as Dirty

  • No-Frost

  • Good Adaptability to Narrow Spaces

make the Bottlebrush Heat Exchanger the most efficient Heat Exchanger available in the market.

The Bottlebrush Heat Exchanger is an excellent VAR and OEM Product for Equipment Maufacturers.

The structure of the Bottlebrush Heat Exchanger is unique compared to traditional tubular, spiral and plate exchangers. It has a radically larger surface area in the gas side. Instead of fins, countless thin copper, aluminium or steel bristles form a superior heat transfer surface. And further, in the liquid side, the heat transfer coefficient is insuperable because of the helical structure of the tubes.


The value of the Nusselt Number describes the Internal Coefficient of Heat Transmission, or Heat Transmission between the liquid or gas inside the tube and the Tube Material of the Exchanger. It  can be seen in the figure above that, within the measured interval, Internal Transmission in a spiral tube is far better than that in the straight tube.


Bottlebrush Heat Exchanger is the superior solution especially in environments where

1) Freezing obstructs competing systems, e.g. in Cold Storage and Reefers or Refrigerated Transportation systems. The Bottlebrush Heat Exchanger Module is an excellent OEM Product for Equipment  Manufacturers of Cold Storage and Reefer / Refrigerated Transportation Systems.

2) Every percentage increment of heat recovered is of value in Energy Saving purposes. The Bottlebrush-Exchanger-based heat recovery systems save over 60% of the heating or cooling energy by recovering it from Combustion Gases or Exhaust Air. The recovered energy can be transferred into the heating or cooling of the fresh supply air, industrial process liquids or household water. Energy recovery products provide high indoor air quality while drastically reducing energy consumption when compared to both conventional and all competing heat exchanger technologies. See further in Heat Recovery

3) High contents of impurities like dust, fallen leaves, grease, industrial impurities, sawdust, cotton dust and other impurities are obstructing competing heat exchangers. Dirty air is not a problem for the Bottlebrush Heat Exchanger, as it is not blocked by impurities, and even as dirty, Pressure Drop*  remains low, because the airstream always finds a way through the Bottlebrush Exchanger.

* A Heat Exchanger's resistance to the airflow passing through it, is called Pressure Drop. It is measured as the difference between the entering and exiting Static Pressures of air before and after the Exchanger.

Pressure drop should be kept reasonably low due to the larger fan horsepower and energy required to maintain design airflows. A doubling of pressure drop (PD) will double the required fan horsepower (BHP) (i.e. BHP = K x CFM x PD). Also, increased pressure drop tends to increase pressure differential between airflows in a ventilation system, which can be undesirable.

The pressure drop caused by the VONEX Heat Exchanger is extremely low, and remains so even if the exchanger is dirty. 


The Bottlebrush Heat Exchanger Module is an excellent OEM Product for e.g. Equipment Manufacturers in the fields of

  • Refrigerated Transportation Systems, Reefers, Cold Storage Chambers (No-Frost)

  • Air and Liquid Heating and Cooling Systems

  • Anti-Bacterial Air and Liquid Heating and Cooling Systems (All-Copper Exchangers)

  • Chemical Process Heating and Cooling Systems (Stainless Steel - AISI 304 - and Acid Resistent Steel - AISI 316 -  Exchangers)

  • Building Renovation and Heat Recovery, Preheating, Postheating, Cooling and Evaporator Applications

  • Special Applications (Titanium Heat Exchangers)

Due to its Flexible and Modular Structure, it is easy to combine various Bottlebrush Heat Exchanger Elements into larger units according to the energy need:

One example of the easy applicability of the
Bottlebrush Heat Exchanger is the Nunnavuori School / Student Clinic in Turku, Finland. The optimal supply air temperature in the class rooms is 17 C, whereas in the clinic the optimal temperature is 22 C. The simple solution was to install one sole Bottlebrush Heat Exchanger module in the supply air duct of the clinic (see above).


Tubular Heat Exchangers Gas/Gas

When we need heat recovery of high volumes of flue gases for the heating of e.g. air, a tubular heat exchanger may be more practical than the bottlebrush heat exchanger. Although the heat transfer efficiency is lower for the tubular system, the tubular exchanger allows higher volumetric flows of flue gases on both sides of the heat recovery system.


Tubular Heat Exchanger, Stainless Steel AISI 304, AISI 316 etc.

Dimensioning a Heat Exchanger for Your Needs

Heat Recovery and Heating



It is easy to clean the Bottlebrush Heat Exchanger. The cleaning should be done 1 - 3 times a year depending on the impurities of air in the environment. First the Exchangers are vacuumed. If necessary, the Exchangers can then be cleaned with a  Pressure Washer and water containing a detergent.

More information on cleaning the Bottlebrush Heat Exchangers.