EP 3118547 A1 20170118 - REFRIGERANT CHARGE AND CONTROL METHOD FOR HEAT PUMP SYSTEMS
Title (en)
REFRIGERANT CHARGE AND CONTROL METHOD FOR HEAT PUMP SYSTEMS
Title (de)
KÜHLMITTELLADUNGS- UND -STEUERUNGSVERFAHREN FÜR WÄRMEPUMPENSYSTEME
Title (fr)
CHARGE DE RÉFRIGÉRANT ET PROCÉDÉ DE COMMANDE POUR DES SYSTÈMES À POMPE À CHALEUR
Publication
Application
Priority
US 201514798949 A 20150714
Abstract (en)
A heat pump system (10) comprises a compressor (16), at least one expansion valve (22; 36), an accumulator (18) for storing a volume of liquid refrigerant therein, a liquid refrigerant indicator connected to the accumulator (18) to indicate an appropriate refrigerant charge in cooling and heating modes, and a controller (28). The controller (28) is configured to determine a target compressor discharge pressure based on measured outdoor air temperature and control the compressor discharge pressure by modulating the position of the at least one expansion valve (22; 36), wherein the higher the target discharge pressure target, the less liquid refrigerant is left in the accumulator (18). The accumulator (18) can be sized to always have capacity to hold excess refrigerant during heating operations, and can include a charge level indicator so as to allow proper charge of the system (10) in the field without additional tools.
IPC 8 full level
F25B 49/02 (2006.01); F25B 43/00 (2006.01); F25B 13/00 (2006.01)
CPC (source: CN EP US)
F25B 13/00 (2013.01 - EP US); F25B 43/006 (2013.01 - EP US); F25B 45/00 (2013.01 - CN US); F25B 49/02 (2013.01 - EP US); F25B 49/022 (2013.01 - CN); F25B 2500/19 (2013.01 - EP US); F25B 2500/23 (2013.01 - EP US); F25B 2500/24 (2013.01 - EP US); F25B 2600/2513 (2013.01 - EP US); F25B 2700/04 (2013.01 - EP US); F25B 2700/1931 (2013.01 - EP US); F25B 2700/2104 (2013.01 - EP US); F25B 2700/2106 (2013.01 - EP US)
Citation (applicant)
- US 5136855 A 19920811 - LENARDUZZI FRANK J [CA]
- US 2008127667 A1 20080605 - BUCKLEY PAUL K [US], et al
- US 8578731 B2 20131112 - JIN DAE-HYUN [US]
- US 6227003 B1 20010508 - SMOLINSKY DAVID [US]
- US 5937670 A 19990817 - DERRYBERRY ANDY L [US]
Citation (search report)
- [I] WO 2014203364 A1 20141224 - MITSUBISHI ELECTRIC CORP [JP] & US 2015247660 A1 20150903 - NAKAJIMA KOMEI [JP], et al
- [X] EP 2077427 A1 20090708 - LG ELECTRONICS INC [KR]
- [X] EP 2175212 A1 20100414 - DAIKIN IND LTD [JP]
- [X] EP 2172720 A1 20100407 - THERMO KING CORP [US]
- [X] US 2015176880 A1 20150625 - OCHIAI YASUTAKA [JP], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3118547 A1 20170118; CN 106352625 A 20170125; US 2017016659 A1 20170119
DOCDB simple family (application)
EP 16177127 A 20160630; CN 201610552084 A 20160714; US 201514798949 A 20150714