Title:
TWO-STAGE CASCADE REFRIGERATION CYCLE DEVICE, AND TWO-STAGE CASCADE REFRIGERATION CYCLE DEVICE CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2024/058136
Kind Code:
A1
Abstract:
According to the present invention, when employing a refrigeration cycle circuit equipped with a heat storage device while employing a multi-stage refrigeration cycle, a sufficient amount of refrigerant in the refrigeration cycle circuit during operation is ensured, and a heat storage capability is also maintained without compromising a comfort level by suppressing a decrease in heating capability. This two-stage cascade refrigeration cycle device comprises a high-stage side refrigerant circuit (1) through which a high-stage side refrigerant circulates, a low-stage side refrigerant circuit (2) through which a low-stage side refrigerant circulates, a high-stage side heat storage circuit (3) equipped with a heat storage heat exchanger (H) which is provided in parallel with a cascade heat exchanger (C) through which the high-stage side refrigerant circulates, a low-stage side heat storage circuit (4) equipped with the heat storage heat exchanger (H) through which the low-stage side refrigerant circulates, a refrigerant temperature detecting unit (5) for measuring or calculating a saturation temperature of the low-stage side refrigerant discharged from a low-stage side compressor (21), a heat storage temperature sensor (HS) for measuring a temperature of a heat storage material, and a control unit (6), wherein, when performing a space heating operation, the control unit (6) acquires information relating to the saturation temperature and information relating to the temperature of the heat storage material, and controls the low-stage side compressor (21) such that a temperature difference between the saturation temperature and the temperature of the heat storage material is a first prescribed value.
Inventors:
ODA AKINOBU (JP)
MAEMA YOSHINARI (JP)
NAKATA SHOHEI (JP)
KANEI KAZUKI (JP)
MAEMA YOSHINARI (JP)
NAKATA SHOHEI (JP)
KANEI KAZUKI (JP)
Application Number:
PCT/JP2023/033081
Publication Date:
March 21, 2024
Filing Date:
September 11, 2023
Export Citation:
Assignee:
FUJITSU GENERAL LTD (JP)
International Classes:
F25B7/00; F24F11/41; F24F11/875; F25B1/00; F25B13/00; F25B47/02; F24F140/00
Domestic Patent References:
| WO2010098005A1 | 2010-09-02 |
Foreign References:
| CN110779241A | 2020-02-11 | |||
| JPH11201569A | 1999-07-30 | |||
| JP2013130357A | 2013-07-04 | |||
| JP2013083407A | 2013-05-09 |
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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