Hoval presents new sealing with minimum leakage for rotary heat exchangers
Directives and standards are increasingly focusing on leakage in rotary heat exchangers. Modern rotary heat exchangers are often only equipped with simple brush seals or inflexible fixed sealings, which cannot reliably prevent leakage.
Hoval has developed and patented the answer to this problem; a sealing system based on a constant-force spring which presses the seals permanently and with consistent pressure against the casing.
Hoval rotary heat exchangers equipped with this system therefore have extremely low leakage rates. This is significant not only from the point of view of hygiene, but also when it comes to energy technology, because the aim of an air conditioning system is to bring fresh air into a building. Leakage means that recirculating air is supplied instead of fresh air. While just as much electrical power is required to convey recirculating air as fresh air, recirculating air has no effective benefit.
Fans are the largest consumers of electrical energy in modern air conditioning units. That is why high-quality rotor sealing is extremely important for efficient operation of the units. VDI Directive 3803 Sheet 5, currently still in the draft stage, addresses this issue. It stipulates that the size of air handling units must be increased by the amount of their leakage at the rotary heat exchanger. This means that unit manufacturers equipping their systems with the especially leaktight rotary heat exchangers from Hoval can size their units smaller – this saves costs and energy.
The selection program Hoval CARS automatically allows for the leakage of rotary heat exchangers depending on type and differential pressure in the design calculation. The CARS program is certified by Eurovent and TÜV (German technical inspection agency) and is available for free download on the Internet (wrg.hoval.com).
Patented sealing system from Hoval: Constant-force springs press the seals permanently and with consistent pressure against the casing.
The outstanding leak-tightness of Hoval rotary heat exchangers means that air handling units can be sized smaller.
Media contacts:
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Liechtenstein Alina Ivanescu alina.ivanescu@hoval.com Tel. +423 399 2665 Fax +423 399 2363 Hoval Aktiengesellschaft Austrasse 70 9490 Vaduz Tel. +423 399 2400
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Switzerland Roland Boss roland.boss@hoval.ch Tel. +41 (44) 925 61 11 Fax +41 (44) 923 62 56 Hoval AG General Wille-Str. 201 8706 Feldmeilen |
Germany Heike Mahler heike.mahler@hoval.com Tel. +49 (0) 89 922097 128 Fax + 49 (0) 89 922097 840 Hoval GmbH Humboldtstrasse 30 85609 Aschheim Tel. +49 (0) 89 922097 0
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Austria Thomas Bacik klimatechnik@hoval.at Mobil +43 (0)664 600 555 911 Fax +43 (0)50 365 99 5911 Hoval Gesellschaft mbH Hovalstrasse 11 4614 Marchtrenk Tel. +43 (0)50 365 0
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