Types of rotors



W = ready-to-use rotary heat exchanger (24h test run in the factory)
S = segmented rotary heat exchanger, for final assembly at the point of use

Casing design

G = Version for installation in central air handling unit with very good accessibility. Casing open on all sides. Control unit mounted or loose.
Z = Version for installation in the central air-handling unit or for intermediate flange or connection to the air duct system. All-round casing with side panels and additional axial inspection openings. Control unit mounted or loose.

Casing material

A = Solid welded aluminium frame construction with panels made of seawater resistant aluminium.
V = Solid welded frame construction made of galvanised steel tube with galvanised steel sheet panels.

On request, we can also deliver our casings in stainless steel or with an additional powder coating. Our flexible production allows the manufacture of all cases in mm steps.


General information on rotorsystems

Lautner regenerative rotary heat exchangers:

  • Very high heat recovery performances
  • Low investment costs
  • Less space requirements
  • Less self-consumed energy
  • Low pressure drops
  • Power for rotor drive negligible
  • No freeze problems
  • No hazard due to toxic substances in the system such as glycol
  • Self-cleaning features
  • No additional filter to protect the rotary heat exchanger
  • Most modern electronic variable speed drive systems
  • Regulatable recovery performance
  • Automatic cleaning devices
  • Extensive auxiliary product range
  • No bypass flaps necessary
  • Indirect adiabatic cooling possible
  • If planned properly, the amortisation period is usually less than a year.
  • Eurovent certified performance

Since the 1970s rotorsystems have been installed in air conditioning plants and for nearly two decades Lautner Energiespartechnik GmbH has been manufacturing regenerative rotary heat exchangers in its Helmstadt factory. We continuously develop the quality of our rotorsystems further to comply with currently valid standards.

Thus the latest generation of Lautner Energiespartechnik rotorsystems conform to the requirements of the current DIN 6022 on hygienic requirements for ventilation systems. Modern variable speed drive systems guarantee high heat recovery performance at low self-consumed energy.

To provide you with the best possible design reliability we have the quality of our products and design software confirmed by regular control measurements. In 2005 we were the first German manufacturer of regenerative rotary heat exchangers to receive the Eurovent certification.

Prices for energy continue to rise and the legal determining factors will continue to drive the importance of energy efficient buildings further. The trend that emerges from these developments is obvious: Renter and buyers of buildings will be better informed on the operating costs to be expected and investment incentives are created for operating on the market with buildings that have a high energy efficiency.

Lautner Energiespartechnik has for several decades now provided a significant contribution to the increase of energy efficiency in buildings. In the field of heat recovery, rotorsystems are the systems with the best heat recovery performance with simultaneously low investment costs.

Functional description

Rotorsystems are used for recover the heat energy contained in the exhaust air of ventilation systems. The supply air is fed through one half of the continuously rotating rotor, while the exhaust air is fed in counter-flow through the other half of the rotor. The flow channels are divided with supply air and exhaust air flowing in opposite directions, whereby the warmer air flow gives off energy to the rotating heat storing mass.

In the other half of the rotor the cooler air flow meets the warm heat storing mass. Due to the temperature difference a heat transfer takes place from the heat storing mass to the air flow. The cold supply air is steadily warmed as it flows through the heat storing mass. In the other half of the rotor there is a constant heat dissipation by the exhaust air flow to the heat storing mass. Energy savings of up to 90 % are possible.

In the example shown above the supply air is heated from - 15 °C to + 15 °C by the recovery of the heat energy contained in the exhaust air. By this functional principle rotorsystems are also suited for cooling during the summer. For cooling during the summer the process is reversed.

Functional description

Technical description

The regenerative rotary heat exchangers made by Lautner Energiespartechnik consist of three main components:

Lautner Energiespartechnik manufactures rotors with diameters ranging from 500 mm to 5000 mm. The standard rotor depth is 200 mm. An outstanding feature of the heat storing mass is that it provides the greatest heat-exchange surface in the smallest space - a m³ storing mass contains 3000 m² heat exchange surface.

The cylindrical heat storing mass is continuously moved between the exhaust air and the supply air flow. In this the air flows in counter-flow through a multitude of heat storing channels that are parallel to the axis.

A special feature of the Lautner Energiespartechnik rotorsystems is the heat storing mass with a smooth even rotor surface. The parallel running air inflow edges of the incoming flow surfaces cause a reduction of the turbulences when the air flows into the rotor. The entry route until a stable laminar flow has been reduced to less than 1 mm in the rotorsystems from Lautner Energiespartechnik. Inside the rotor there is a steady laminar flow. Based on the laminar flow within the rotor there is a boundary layer to the heat transfer channel walls. This creates several benefits:

  • No soiling within the rotor
  • Self-cleaning effect
  • Complying to high hygienic requirements
  • Freezing is prevented

For the optimal multiple use of the sensitive or sensitive and latent heat energy contained in the exhaust air we offer different rotor types.

The shape of the casings that we manufacture for you is not limited; we can gladly customize to your needs. As a standard we offer stable welded frame constructions with casing panels made of sea-water-resistant aluminium or of galvanized steel sheet for various requirements. Adjustable rotor circumference and core seals as well as various purge sector systems guarantee high impermeability and high effectivity.

The variable speed drive units consist of a motor and a speed regulation device. The precise, gearless motors are mounted on an elastic motor console inside the casing. The speed regulation device can be mounted either inside or on the casing. The rotor is brought to the proper speed by a V-belt. The speed is controlled by the regulating device. Due to a high speed range our rotorsystem achieve great energy savings and low operating costs.

To drive our rotorsystems we offer various systems. of two reliable systems:

  • Variable speed drive units: rotortronic VVX
  • Variable speed drive units: rotortronic RHX

Technical description