Title:
HEAT-EXCHANGE-TYPE VENTILATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/269820
Kind Code:
A1
Abstract:
A control unit (123): stores the present rotational speed of an exhaust motor as a pre-freeze reference rotational speed when the outdoor temperature is less than a predetermined temperature threshold; performs control for reducing the air volume of an air supply blower (3) to less than that of an exhaust blower (4) for a predetermined operation change time period when the present rotational speed of the exhaust motor after storage of the pre-freeze reference rotational speed is equal to or greater than a freeze assessment rotational speed greater than the pre-freeze reference rotational speed; senses that clogging has occurred in an exhaust filter when the present rotational speed of the exhaust motor after elapse of the operation change time period does not decrease by a predetermined decrease assessment set value or more relative to the freeze assessment rotational speed; and, senses that clogging has occurred in a heat exchanger due to freezing when the present rotational speed of the exhaust motor after elapse of the operation change time period decreases by the decrease assessment set value or more relative to the freeze assessment rotational speed.
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Inventors:
NAGATA FUKUTARO (JP)
ITO HIROKI (JP)
ITO HIROKI (JP)
Application Number:
PCT/JP2021/023839
Publication Date:
December 29, 2022
Filing Date:
June 23, 2021
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F24F7/08
Domestic Patent References:
| WO2020196274A1 | 2020-10-01 | |||
| WO2015146018A1 | 2015-10-01 | |||
| WO2012004978A1 | 2012-01-12 | |||
| WO2009128150A1 | 2009-10-22 |
Foreign References:
| JP2019090593A | 2019-06-13 | |||
| JP2018036006A | 2018-03-08 | |||
| JP2015135199A | 2015-07-27 | |||
| JP2004316940A | 2004-11-11 |
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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