Lufttechnik Schmeißer (LTS) from Berlin has been working on the formula for fresh and healthy indoor air for a long time. The family-owned company, which has been in business since 1903, developed air heating as early as 1945, before launching the first motor-driven ventilation system in 1983. In 2019, the company finally decided to upgrade its TSL-150 decentralized ventilation unit and looked for suitable components at ISH trade fair. “Our buildings are becoming increasingly dense and require high-performance ventilation systems. These in turn have to run more and more efficiently. This is why we wanted to give our TSL-150 an upgrade – to keep pace with the times,” explains Sebastian Scholz, third-generation managing director at LTS.
Complete solution for convenience
ebm-papst, with whom Schmeißer has been working since 1993, presented the EC centrifugal fan RadiCal in a scroll housing at ISH. Its features won LTS over immediately. “The fan has a great set of stats and also has everything we need in terms of sensors. On top of that, it’s easy to connect,” explains Sebastian Scholz.
Nikolai Lukin, Team Leader Residential Ventilation at ebm-papst, adds: “When further developing the RadiCal, our main focus was on efficiency and volume consistency. We can only achieve this using sensor technology – which is why we developed the scroll housing and now offer our customers a plug-and-play system solution.”
The integrated anemometer measures the air flow, and the electronics regulate it to an accuracy of about one percent. The built-in sensors for humidity and temperature make it possible to control the fan as needed. “With it, we are now 30 percent more efficient and 3.5 dB (A) quieter than with comparable centrifugal blowers,” says Scholz. It wasn’t just the integrated sensors and improved figures that were crucial to him and his team: “Its MODBUS interface allows us to easily read out the values, even remotely, or connect additional sensors like a CO2 meter if needed. That’s state of the art.”
New concept – more possibilities
The optimized design and extended range of functions meant that it no longer made sense to install the ventilation system in existing types of unit; a completely new one was needed. The result was the TSL-152: a decentralized ventilation unit incorporating two RadiCal in a scroll housing and achieving a rated air flow of 125 cubic meters per hour. “We pulled out all the stops in terms of design,” says Scholz. This is because the new ventilation unit is designed to cater primarily to individual rooms in multi-story buildings such as hotel rooms or smaller apartments, which makes installation particularly tricky.
For the TSL-125 we pulled out all the stops in terms of design.Sebastian Scholz, Managing Director at Lufttechnik Schmeißer
For example, there is a maximum height of 30 centimeters available for the unit in the false ceiling. The TSL-152 fits right in at 28 centimeters. This is also due to a special foam forming the new base for the self-supporting housing, which is replacing the old aluminum-based one. This saves weight, space, and enables greater quantities to be produced. “The new design was also important because we didn’t want to compromise on air filtration, heat recovery or humidity control,” explains Christoph Stein, design expert at Schmeißer. As a result, the ventilation system achieves an efficient 86 percent heat recovery, and 76 percent moisture recovery. It also filters minute particles such as fine dust, viruses and bacteria in outdoor air to at least 55 percent in accordance with filter class ePM1. “If necessary, however, you can also go up a notch here.”
Ventilation and heating
Another feature makes the ventilation system the first combination unit at Lufttechnik Schmeißer: “As an option, we can also connect a heating coil to the TSL-152 and replace other heating systems. This makes both the supply and the billing over separate electrical circuits much simpler,” explains Sebastian Scholz. Efficiency also has to be right for all the functions. “With a device that runs almost continuously, such as a ventilation system, it does make a difference whether the device runs at well over 50 kilowatts an hour, or only 36 like the TSL-152. In addition, the sensor technology in the RadiCal ensures that the system is optimized for demand, making it even more economical on the bottom line.”
Sustainability taken to its logical conclusion
During the two-year development of the TSL-152, the companies were in regular contact with each other. “The support was excellent,” says Scholz. Lufttechnik Schmeißer is one of the first companies to use this new development from ebm-papst in series production.
LTS has also given thought to packaging. “If you think about the number of units in a hotel or residential building that all have to be individually packaged, you can imagine the amount of special packaging waste like styrofoam,” notes Christoph Stein. “We have sufficient confidence in the stability of our product. So our ‘slim packaging concept’ was created, consisting only of cardboard box and a bag made of recyclable PE plastic, which is also intended to serve as temporary protection against construction dust once the ventilation unit is installed in the ceiling by simply being slipped over the unit from below.”
Jens Duchow, regional manager and contact person for LTS at ebm-papst adds: “We are very pleased that Lufttechnik Schmeißer is on the same wavelength as us when it comes to sustainability and efficiency.” Schmeißer has already used the innovative all-round concept for various customers such as a school and a motel. “We want to move more into multi-story buildings. They’re becoming increasingly important, and that’s exactly what our device is designed for.”