REFRIGERATION CYCLE DEVICE

PROBLEM TO BE SOLVED: To detect leakage of a refrigerant in a refrigeration cycle with high accuracy.SOLUTION: A refrigeration cycle device includes a refrigeration cycle for returning a discharged refrigerant of a compressor to the compressor through a condenser, a plurality of expansion valves, and a plurality of evaporators respectively connected to the expansion valves, and a detection portion for estimating a first total opening at a first time point of the plurality of expansion valves in a case where it is assumed that refrigerant leakage does not occur in the refrigeration cycle, on the basis of variation of a first state quantity of the refrigeration cycle at the first time point and a second state quantity of the refrigeration cycle at a second time point before the first time point, and detecting the refrigerant leakage of the refrigeration cycle by comparing a second total opening as the actual total opening at the first time point of the plurality of expansion valves with the first total opening.SELECTED DRAWING: Figure 1 【課題】 冷凍サイクルにおいて冷媒の漏洩を精度良く検出する。【解決手段】 一実施形態に係る冷凍サイクル装置は、圧縮機の吐出冷媒を凝縮器、複数の膨張弁、これら膨張弁にそれぞれ接続された複数の蒸発器に通して前記圧縮機に戻す冷凍サイクルと、前記冷凍サイクルに冷媒漏洩が無いと仮定した場合の前記複数の膨張弁の第１時点における第１合計開度を、前記第１時点における前記冷凍サイクルの第１状態量と前記第１時点よりも過去の第２時点における前記冷凍サイクルの第２状態量との変化量に基づいて推定し、前記複数の膨張弁の前記第１時点における実際の合計開度である第２合計開度と前記第１合計開度との比較により前記冷凍サイクルの冷媒漏洩を検出する検出部と、を備える。【選択図】 図１