DEFROSTING CONTROL METHOD FOR MULTI-SPLIT SYSTEM - QINGDAO HAIER AIR CONDITIONING ELECTRONIC CO LTD

Title:

DEFROSTING CONTROL METHOD FOR MULTI-SPLIT SYSTEM

Document Type and Number:

WIPO Patent Application WO/2019/015444

Kind Code:

A1

Abstract:

A defrosting control method for a multi-split system. A mutli-split system comprises an outdoor unit and multiple indoor units. An expansion valve is provided on a connecting pipeline between each of the indoor units and the outdoor unit. When the expansion valve of each activated indoor unit is closed and the degree of opening of the expansion valve of each disactivated indoor unit is less than or equal to a maximum set degree of opening, the system satisfies a defrosting requirement, and as a result the method controls the expansion valve of each activated indoor unit to remain closed, thereby resolving the issue of a dramatic temperature drop in a room having an activated indoor unit during defrosting and improving user satisfaction. The degree of opening of the expansion valve of a disactivated indoor unit is Off_PLS, and is controlled such that Off_PLS = ALL_HP * Avg_PLS / Off_HP. The invention satisfies a defrosting requirement and reduces the degree of opening of the expansion valves as much as possible, thereby preventing damage to a compressor without affecting defrosting.

More Like This:

JPH04369366

COOLER

Inventors:

ZHUO BAITIAN (CN)
SHI BIN (CN)
CHENG SHAOJIANG (CN)
ZHANG RUIGANG (CN)
ZHANG WANYING (CN)

Application Number:

PCT/CN2018/092161

Publication Date:

January 24, 2019

Filing Date:

June 21, 2018

Export Citation:

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Assignee:

QINGDAO HAIER AIR CONDITIONING ELECTRONIC CO LTD (CN)

International Classes:

F25B47/02; F24F11/00; F25B49/02

Foreign References:

CN107461877A	2017-12-12
CN105674648A	2016-06-15
CN106322580A	2017-01-11
CN104061651A	2014-09-24
CN104266423A	2015-01-07
CN106091505A	2016-11-09
CN104596032A	2015-05-06
JP2000179969A	2000-06-30

Other References: