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REFRIGERATING AND AIR-CONDITIONING APPARATUS

  • US 20120318011A1
  • Filed: 03/12/2010
  • Published: 12/20/2012
  • Est. Priority Date: 03/12/2010
  • Status: Active Grant
First Claim
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1. A refrigerating and air-conditioning apparatus comprising:

  • a refrigerant circuit in which an outdoor unit, serving as a heat source unit, and an indoor unit, serving as a use side unit, are connected by a refrigerant extension pipe;

    a measurement section configured to measure, as operation data, a temperature and a pressure in each essential part of the refrigerant circuit;

    a calculation section having an operation data acquisition requirement for acquiring operation data, the calculation section being configured to, each time an operation state indicated by operation data measured by the measurement section during normal operation meets the operation data acquisition requirement, acquire the operation data as initial learning operation data, perform a process of calculating an amount of refrigerant in parts other than the extension pipe and an extension-pipe density on the basis of the initial leaning operation data, calculate an internal volume of the extension pipe on the basis of a group of calculation data items indicating calculations by the process, and calculate a standard refrigerant amount, serving as a criterion for determination as to whether the refrigerant is leaked from the refrigerant circuit, on the basis of the calculated extension-pipe internal volume and the initial learning operation data;

    a storage section configured to store the extension-pipe internal volume and the standard refrigerant amount; and

    a determination section configured to calculate a total amount of refrigerant in the refrigerant circuit on the basis of the extension-pipe internal volume stored in the storage section and operation data measured by the measurement section during normal operation, and compare the calculated total refrigerant amount with the standard refrigerant amount stored in the storage section to determine whether the refrigerant is leaked.

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