Described herein is a method for operating a refrigerated shipping container containing respiring produce, the method including: passing a cooled CO.sub.2-rich air stream from an internal environment within the shipping container through a CO.sub.2 selective membrane of a membrane system to produce a cooled CO.sub.2-lean air stream and a CO.sub.2-rich permeate stream; retaining or returning the cooled CO.sub.2-lean air stream to the internal environment; and exhausting the CO.sub.2-rich permeate stream to an external environment outside of the shipping container; drawing external air or permitting external air to pass into the shipping container through an air vent with a pre-set fixed opening of the shipping container in a volume to at least balance a volume difference between the cooled CO.sub.2-rich air stream and the cooled CO.sub.2-lean air stream; wherein the membrane system is operated according to a pre-set mode, and the pre-set mode is independent of a measured gas concentration or pressure of the internal environment; and the pre-set fixed opening of the vent is selected based on one or more characteristics of the respiring produce and the pre-set mode of the membrane system.

In an air composition adjustment device configured to adjust composition of air in a target space, an air circuit configured to supply air having adjusted composition to the target space is provided with a first passage through which outside air is introduced into an adjuster, and a second passage which is branched from the first passage and through which outside air is introduced into the sensor, and the second passage is provided with a moisture removal portion configured to remove moisture in air introduced into the sensor. This reduces a risk of a failure of the sensor due to contact of the sensor with moisture passed through the passage introducing outside air into the sensor.

A hybrid nitrogen gas generation system includes a membrane nitrogen gas generator and a pressure swing absorption nitrogen generator. A gas comprising nitrogen is purified to a first nitrogen purity using one of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator. The gas is either bypassed around the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator to provide the gas having the first nitrogen purity or the gas is purified to a second nitrogen purity using the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator.

A hybrid nitrogen gas generation system includes a membrane nitrogen gas generator and a pressure swing absorption nitrogen generator. A gas comprising nitrogen is purified to a first nitrogen purity using one of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator. The gas is either bypassed around the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator to provide the gas having the first nitrogen purity or the gas is purified to a second nitrogen purity using the other of the membrane nitrogen gas generator and the pressure swing absorption nitrogen generator.

To configure existing drawers as evacuable drawers of a vacuum drawer device, a cover for installation in the drawer body can be used. The cover evacuates at the drawer interior with an evacuation system, so that the interior is evacuated when the drawer is closed and ventilated before the drawer is opened. The cover is airtight, is profiled in such that evacuation with a controller, a pump and a valve are fixedly integrated in at least one recess in the cover and the cover has at least one air channel leading into the inside of the cover or, respectively, into the at least one recess, with the air channel operatively connected to the evacuation system such that when the cover is placed onto the drawer, air from the interior can be pumped out of the interior, the inside of the cover interior or, respectively, the at least one recess through the air duct.

An oxygen removal module, a fresh-keeping device and a refrigerator. The oxygen removal module comprises: an electrolyte tank provided with a water inlet; and a water tank provided with a water outlet, the water outlet being connected to the water inlet through a first pipeline, to supplement water to the electrolyte tank by means of the water tank.

An oxygen removal module, a fresh-keeping device and a refrigerator. The oxygen removal module comprises: an electrolyte tank provided with a water inlet; and a water tank provided with a water outlet, the water outlet being connected to the water inlet through a first pipeline, to supplement water to the electrolyte tank by means of the water tank.

A fresh-keeping device for a refrigerator, and a refrigerator. The fresh-keeping device includes a fresh-keeping box body having a lower frame and an upper frame, the lower frame being provided with an accommodating space as well as an opening and a gas inlet communicated with the accommodating space, the upper frame being provided with a refrigerating air channel, and the refrigerating air channel being used for refrigerating the accommodating space; a drawer is configured to enter from the opening and accommodated in the accommodating space to fit the fresh-keeping box body to form the sealed accommodating space; and a nitrogen generating means connected to the side of the fresh-keeping box body on which the gas inlet is formed and is configured to charge generated nitrogen into the accommodating space from the gas inlet.

A fresh-keeping device for a refrigerator, and a refrigerator. The fresh-keeping device includes a fresh-keeping box body having a lower frame and an upper frame, the lower frame being provided with an accommodating space as well as an opening and a gas inlet communicated with the accommodating space, the upper frame being provided with a refrigerating air channel, and the refrigerating air channel being used for refrigerating the accommodating space; a drawer is configured to enter from the opening and accommodated in the accommodating space to fit the fresh-keeping box body to form the sealed accommodating space; and a nitrogen generating means connected to the side of the fresh-keeping box body on which the gas inlet is formed and is configured to charge generated nitrogen into the accommodating space from the gas inlet.

A method is described herein for slowing, inhibiting, and/or preventing the growth of microbes, or for killing microbes, within and/or on a product/good that is stored in a package. The method can include applying a film cover over a perforated portion of a package and securing the film cover to the package at the perimeter of the perforated portion with an adhesive or by heat stacking. The film cover can include a material for changing the atmosphere within the package. The package may be an existing pre-perforated package, or may be a package that requires perforation. If the package requires perforation, the method can further include perforating at least a portion of the package prior to positioning the film cover over the perforated portion. The film cover can be formed of a three-phase material or other material.