{"id":27586,"date":"2026-04-01T16:30:29","date_gmt":"2026-04-01T14:30:29","guid":{"rendered":"https:\/\/www.kma-filter.de\/best-practice-references-exhaust-air-filtration-kma\/best-practice-aunde\/"},"modified":"2026-11-04T14:41:48","modified_gmt":"2026-11-04T13:41:48","slug":"best-practice-aunde","status":"publish","type":"page","link":"https:\/\/www.kma-filter.de\/en\/best-practice-references-exhaust-air-filtration-kma\/best-practice-aunde\/","title":{"rendered":"Best Practice AUNDE"},"content":{"rendered":"\t\t
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Stenter frame heat recovery:<\/strong>
Exhaust air as an energy source<\/h1>\t\t\t\t<\/div>\n\t\t\t\t
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With the KMA ULTRAVENT\u00ae tandem, AUNDE uses the waste heat from two stenter frames, heats process water for upstream washing machines, and saves 2.345 million kWh of energy per year\u2014while exhaust air is cleaned at the same time.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Clean stenter exhaust air and recover 2.345 million kWh of energy per year\u2014like AUNDE<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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At the textile company AUNDE, two stenter frames are not only a source of polluted exhaust air, but also a source of usable process energy. A central KMA heat recovery system recovers heat from around 24,500 m\u00b3\/h of exhaust air, heats process water for the dyeing process, and returns the remaining energy to the stenter frames as preheated air. <\/p>

Result: lower gas consumption, cleaner exhaust air, and a significantly improved carbon footprint.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t

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\"Icon-Energy-Accent\"<\/figure>

- 2.3 million kWh less
energy demand per year<\/h3>

The recovered heat is used directly in the process\u2014for two stenter frames and upstream washing processes.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t

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\"Icon-Industry-Accent\"<\/figure>

- 500 tonnes less CO\u2082 emissions per year<\/h3>

AUNDE reduces fossil energy use and improves the site\u2019s carbon footprint.

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\"Icon-Heat-Exchanger-Eco-accent-light\"<\/figure>

Exhaust air filtration and heat recovery in one system<\/h3>

Electrostatic precipitator, air\/water heat exchanger, air\/air preheating, and automatic CIP cleaning.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Textile finishing on stenter frames is inherently energy-intensive. Depending on the process, operating temperatures can reach up to 200\u00b0C, and energy costs account for a significant share of ongoing production costs. At the same time, the exhaust air is heavily contaminated\u2014among other things with oil smoke, aerosols, fibre and wax particles. Operators are therefore under double pressure: reliably comply with emission limit values and use energy more efficiently at the same time. <\/p>

For two stenter frames at the AUNDE site in M\u00f6nchengladbach, a solution was to be implemented that combines exhaust air filtration and heat recovery. Together, the stenter frames generate around 24,500 m\u00b3\/h of exhaust air at about 140 to 143\u00b0C\u2014ideal conditions to make the thermal energy it contains directly usable again in the process. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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High energy demand,
polluted exhaust air, and rising pressure to act<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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The starting situation at Aunde in textile finishing<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Stenter exhaust air is hot, energy-rich, and at the same time heavily contaminated with particles, aerosols and oily components.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Top 3 pain points at AUNDE<\/h2>\t\t\t\t<\/div>\n\t\t
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Control emissions reliably<\/h3>


Oil, fibre and other particles in stenter exhaust air must be reliably separated to comply with legal requirements and site specifications.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t

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Avoid energy losses from
exhaust air<\/h3>

Hot exhaust air carries away
valuable process energy lost \u2013 in case of AUNDE 520.598 \u20ac gas costs p. a. (for the stenter frames) \u2013 even though it could be used directly elsewhere.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t

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High CO2 emissions<\/h3>


Textile finishing is to become more sustainable. High energy consumption directly impacts the CO\u2082 footprint of exhaust air filtration. <\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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The potential on the stenter frame<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Polluted exhaust air becomes usable process energy<\/h2>\t\t\t\t<\/div>\n\t\t
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The biggest lever is to think exhaust air filtration and heat recovery together.<\/p>

This is exactly where KMA comes in: the ULTRAVENT\u00ae tandem can make heat usable as preheated supply air, as hot water, or in combination.<\/p>

This allows the available energy to be utilised far better than with systems that only return hot air to the stenter frame:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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At AUNDE, the recovered energy was to be used entirely within the process. Part of the heat warms water for upstream washing machines; another part is returned to the stenter frames as preheated fresh air. <\/p>