Experimental investigation on the influence of ejector geometry on the pull-down performance of an ejector-enhanced auto-cascade low-temperature freezer

•Effects of ejector geometry on EARC based low-temperature freezer were explored.•Dt and Lm are the critical parameters influencing the pull-down performances.•Malfunction of pressure lift at start-up phase was prone to occur at small Dm.•NXP seriously affects ejector performance instead of the pull...

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