Example systems have a defrost system that can receive a first RF signal at a first frequency to defrost a load. An air treatment device can receive a second RF signal at a second frequency and perform an air treatment process. An RF signal source has a power output, and a switching arrangement selectively electrically connects the defrost system and the first air treatment device to the power output of the RF signal source. A controller can electrically connect one of the defrost system and the first air treatment device to the power output of the RF signal source. When the defrost system is electrically connected, the RF signal source outputs the first RF signal at the first frequency, and when the first air treatment device is electrically connected, the RF signal source outputs the second RF signal at the second frequency.

An aseptic ice making system includes an ice making system to receive water from a water supply. The ice making system includes an ice producing subsystem to produce ice and a positive air pressure subsystem to maintain a positive air pressure environment within the ice making system.

A refrigerator includes a cabinet coupled to one or more doors forming a storage compartment. The refrigerator additionally includes a first fan assembly positioned on an interior surface of a first cabinet wall, and a second fan assembly positioned on the interior surface of a second cabinet wall. The first and second fan assemblies each include: two or more circulation fans; a filter coupled to a photocatalyst to form an activated filter; and a plurality of UV LEDs positioned to project light on the activated filter. An air circulation path is configured to direct air born bacteria and particulate matter within the storage compartment contemporaneously into the first and second fan assemblies using the two or more circulation fans and circulate filtered air into the storage compartment through the activated filter disposed in the air circulation path.

A refrigerator includes a cabinet coupled to one or more doors forming a storage compartment and an air purifying duct system positioned in the storage compartment. The air purifying duct system includes an air duct in fluid communication with the storage compartment; a fan configured to circulate air between the storage compartment and air duct; a photocatalyst disposed on a portion of the interior surface; one or more LEDs positioned to project light across the air duct and onto the photocatalyst; and an air circulation path configured to direct pathogens within the storage compartment into the air duct using the fan and circulate purified air into the storage compartment.

Ultraviolet radiation is directed within an area. The storage area is scanned and monitored for the presence of biological activity within designated zones. Once biological activity is identified, ultraviolet radiation is directed to sterilize and disinfect designated zones within the storage area.

Refrigerator appliances, including active air filter assemblies for use therein, are provided herein. The active filter assembly may include a housing, a filter medium, a field tag, and a field sensor. The filter medium may be removably positioned within the housing. The field tag may be fixed to the filter medium. The field sensor may be attached to the housing to detect the field tag. The controller may be in operable communication with active filter assembly.

A refrigeration appliance includes a storage area for refrigerated goods and a control facility or unit for controlling a storage climate in the storage area by using storage climate parameters. One storage climate parameter is a temperature in the storage area. Another storage climate parameter relates to an air speed in the storage area. The refrigeration appliance is used in particular for the dry curing of meat.

Ultraviolet radiation is directed within an area. The target wavelength ranges and/or target intensity ranges of the ultraviolet radiation sources can correspond to at least one of a plurality of selectable operating configurations including a sterilization operating configuration and a preservation operating configuration.

An air purification module for purifying air includes a photocatalyst filter and a light source unit sequentially arranged in a selected direction. The light source unit is spaced apart from the photocatalyst filter to provide light to the photocatalyst filter and includes a substrate and a light source disposed on the substrate. The substrate includes at least one aperture to control a flow channel and a flow velocity of air so as to improve air purification effects through the photocatalyst filter when the air flows from the substrate towards the photocatalyst filter.

A system for temperature-controlled transport of food on a vehicle includes food carts including an opening for ingress of air and an opening for egress of air and a refrigeration system including air ducts configured to convey pressurized air from the refrigeration unit to the food carts, including air outlets configured to interface with the food carts, air ducts configured to convey air from the food carts to the refrigeration unit, including air inlets configured to interface with the food carts, wherein the air outlets and air inlets include a spring-loaded valve configured for automatically opening when a food cart rests against the valve, and for automatically closing when said food cart no longer rests against the valve, one or more fans configured for circulating air within the air ducts, and, an ultraviolet (UV) light sterilization system located within the air ducts.