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METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM DURING START-UP

  • US 20150233623A1
  • Filed: 07/11/2013
  • Published: 08/20/2015
  • Est. Priority Date: 08/23/2012
  • Status: Active Grant
First Claim
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1. A method for controlling a vapour compression system during start-up, the vapour compression system comprising a compressor, a condenser, an expansion device having a variable opening degree, and an evaporator arranged along a refrigerant path, the method comprising the steps of:

  • starting operation of the vapour compression system,monitoring a first temperature, T1, of refrigerant entering the evaporator,monitoring a second temperature, T2, of refrigerant leaving the evaporator,deriving a first rate of change, Δ

    T1, of the first temperature, and a second rate of change, Δ

    T2, of the second temperature,comparing the first rate of change, Δ

    T1, to the second rate of change, Δ

    T2,based on the comparing step, determining a refrigerant filling state of the evaporator, andcontrolling the opening degree of the expansion device according to a first control strategy in the case that it is determined that the evaporator is full or almost full, and controlling the opening degree of the expansion device according to a second control strategy in the case that it is determined that the evaporator is not full.

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