CONTROL DEVICE, REFRIGERATING MACHINE, CONTROL METHOD, AND PROGRAM

• Main Authors: KADOSHIMA, Yuta, OSADA, Kazumi, KAI, Masakazu, HACHISUKA, Katsumi
• Format: Patent
• Language: English; French; German
• Published: 15.05.2019
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; WEAPONS

A control device includes: a pressure acquisition section which is configured to acquire an outlet pressure of an evaporator from a pressure sensor for detecting a pressure of the refrigerant at an outlet of the evaporator in the refrigeration unit; a temperature acquisition section which is configured to acquire an outlet temperature of the evaporator from a temperature sensor for detecting a temperature of the refrigerant at the outlet of the evaporator; a saturation temperature table acquisition section which is configured to acquire one of a plurality of saturation temperature tables recorded in a recording unit in the refrigeration unit, the plurality of saturation temperature tables corresponding to each of the different refrigerants, the saturation temperature table designating the gas side saturation temperature at each pressure for a corresponding refrigerant; and an expansion valve control section which is configured to control an expansion valve opening degree of an electronic expansion valve in the refrigeration unit to obtain a predetermined degree of superheat, based on the obtained saturation temperature table, the acquired outlet pressure, and the acquired outlet temperature.