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1. (WO2018183107) MULTIPLE STAGE REFRIGERATION SYSTEM AND CONTROL METHOD THEREOF

Pub. No.:    WO/2018/183107    International Application No.:    PCT/US2018/024000
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sat Mar 24 00:59:59 CET 2018
IPC: F25B 1/10
F25B 5/04
Applicants: CARRIER CORPORATION
Inventors: DING, Haiping
SI, Shaojuan
ZHANG, Xiangyuan
STARK, Michael A.
Title: MULTIPLE STAGE REFRIGERATION SYSTEM AND CONTROL METHOD THEREOF
Abstract:
A multi-stage refrigeration system (100) includes: a refrigeration loop (110), which includes a gas suction port of a multi-stage compressor (111), a condenser (112), a first throttling element (113), an evaporator (114) and an exhaust port of the multi-stage compressor which are sequentially connected through pipelines; an economizer branch (120), which includes an economizer (121), a second throttling element (122) and a first control valve (123), the economizer having an economizer liquid inlet connected to the condenser via the first throttling element, an economizer liquid outlet connected to the evaporator via the second throttling element, and an economizer exhaust port connected to an intermediate stage of the multi-stage compressor via a control valve; and a bypass branch (130), which is joined to the evaporator from the downstream of the second throttling element and connected to the condenser via the first throttling element, and on which a second control valve (131) is arranged.