Title:
COOLING SYSTEM, SURGE GENERATION PREVENTION DEVICE, SURGE GENERATION PREVENTION METHOD, AND SURGE GENERATION PREVENTION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2021/005705
Kind Code:
A1
Abstract:
The objective of this invention is to prevent the generation of a surge phenomenon in a compressor by being able to respond quickly even when the load on a server to be cooled changes rapidly. In the present invention, a local cooler (1) is positioned near a server (S) that is a heat source and is consequently able to directly receive heat from the server (S) and quickly change the state of a refrigerant in response to the heat of the server (S). The present invention is characterized by having refrigerant state detection means (6) for detecting the state of a gas-phase refrigerant supplied from the local cooler (1), and a proportional control valve (8) and a high-speed on-off valve (9) which are provided in parallel with a bypass route (7) of a compressor (2) and operated on the basis of a refrigerant state ratio calculated from a detection value of the refrigerant state detection means (6), the proportional control valve (8) being such that an opening degree is controlled in a stepwise manner on the basis of the refrigerant state ratio of the compressor (2), and the high-speed on-off valve (9) being operated to open and close on the basis of the refrigerant state ratio of the compressor (2) and being set to have a larger change in opening degree per unit time than the proportional control valve (8).
Inventors:
MIYAMOTO YOSHINORI (JP)
NATSUMEDA TAKAFUMI (JP)
YOSHIKAWA MINORU (JP)
NATSUMEDA TAKAFUMI (JP)
YOSHIKAWA MINORU (JP)
Application Number:
PCT/JP2019/027113
Publication Date:
January 14, 2021
Filing Date:
July 09, 2019
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
F25B1/00; F24F7/06; G06F1/20
Foreign References:
| JP2017020722A | 2017-01-26 | |||
| JP2009104306A | 2009-05-14 | |||
| JP2006509294A | 2006-03-16 | |||
| JP2019095085A | 2019-06-20 | |||
| JPH06323639A | 1994-11-25 | |||
| JP2004286428A | 2004-10-14 | |||
| JP2018115773A | 2018-07-26 | |||
| JPH08261572A | 1996-10-11 | |||
| JP2004020064A | 2004-01-22 | |||
| JP2015098980A | 2015-05-28 | |||
| US20060065003A1 | 2006-03-30 | |||
| JP2017020722A | 2017-01-26 |
Other References:
See also references of EP 3998434A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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