Title:
ANTI-FREEZING PROTECTION METHOD, ANTI-FREEZING PROTECTION SYSTEM, AND HEAT PUMP UNIT OF WATER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/227365
Kind Code:
A1
Abstract:
The present disclosure relates to an anti-freezing method for a heat pump unit of a water system, an anti-freezing system, and a heat pump unit of a water system. The anti-freezing method comprises the following steps: determining whether an operation mode of a heat pump unit is a cooling operation mode or a heating operation mode, if the operation mode of the heat pump unit is determined to be the cooling operation mode, performing cooling anti-freezing protection, and if the operation mode of the heat pump unit is determined as the heating operation mode, performing heating anti-freezing protection, wherein the heating anti-freezing protection comprises anti-freezing protection for heating operations and a de-frosting anti-freezing operation. When the anti-freezing protection is performed for heating operations, if a water outlet temperature of a heat exchanger is detected to not be higher than a water inlet temperature, operations of the heat pump unit are terminated, and an alarm signal is provided. During the de-frosting anti-freezing protection, if the water outlet temperature is lower than a water temperature limit value, a shutdown is performed, and an alarm signal is provided. In this way, the invention achieves anti-freezing protection in both cooling and heating operation modes, and also enables anti-freezing protection during de-frosting operations.
Inventors:
LUO YAJUN (CN)
XIE JIANG (CN)
YANG JIKUN (CN)
HUANG XIAODONG (CN)
XIE JIANG (CN)
YANG JIKUN (CN)
HUANG XIAODONG (CN)
Application Number:
PCT/CN2020/122389
Publication Date:
November 18, 2021
Filing Date:
October 21, 2020
Export Citation:
Assignee:
EMERSON CLIMATE TECH SUZHOU CO LTD (CN)
International Classes:
F25B49/02; F24F5/00; F24F11/00; F24F11/38; F25B30/02; F25B47/02; F25B49/00; F25D21/04
Foreign References:
| CN105180539A | 2015-12-23 | |||
| CN109237722A | 2019-01-18 | |||
| CN107957156A | 2018-04-24 | |||
| JP2009216321A | 2009-09-24 | |||
| JP2018155456A | 2018-10-04 | |||
| CN103471251A | 2013-12-25 | |||
| CN107166741A | 2017-09-15 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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