As disclosed herein, a preservation system for perishable products in a display case comprises a control valve for connection to a water supply. A pressure regulator is connected to the control valve for reducing water pressure. A plurality of piezoelectric transducer nebulizers are operatively mounted to the display case in spaced apart relation to one another and are fluidically connected in series with an output of the pressure regulator to emit a dry fog. A control system comprises a controller for controlling a duty cycle of a pulse signal to vibrate the piezoelectric transducers in the plurality of nebulizers, and a timer for alternately generating an on and an off signal to periodically control the valve to supply water to the pressure regulator and to enable the controller whereby the nebulizers emit the dry fog to maintain desired relative humidity level throughout the display case.
A dry fog diffuser assembly for use in a refrigerated space comprises a base having an adapter for connection to a high-pressure water supply in a range of 600 to 1,000 psi. The nozzle has an orifice in the range of 0.003-0.012 inches to produce a fine water vapor. A riser operatively connects the nozzle to the adapter to space the nozzle from the base. A housing is mounted to the base and encloses the nozzle. The housing defines an open space below the nozzle providing an air inlet to the interior of the housing. A diffuser comprises a stainless-steel elbow having an inlet end and an outlet end. The inlet end is mounted to the housing. An inner surface of the diffuser has a roughness of at least Ra25, where water vapor from the nozzle is diffused in the elbow and the diffuser produces a dry fog exiting at the outlet end.
F24F 6/14 - Humidification de l'air par dispersion d'eau dans l'air en utilisant des buses
B01F 3/04 - Mélange, p.ex. dispersion, émulsion, selon les phases à mélanger de gaz ou de vapeurs avec des liquides
B05B 1/00 - Buses, têtes de pulvérisation ou autres dispositifs de sortie, avec ou sans dispositifs auxiliaires tels que valves, moyens de chauffage
A47F 3/04 - Vitrines ou meubles d'exposition à air conditionné ou réfrigéré
B05B 7/24 - Appareillages de pulvérisation pour débiter des liquides ou d'autres matériaux fluides provenant de plusieurs sources, p.ex. un liquide et de l'air, une poudre et un gaz avec des moyens, p.ex. un récipient, pour alimenter en liquide ou autre matériau fluide un dispositif de décharge
A dry fog diffuser comprises a support. A shroud is mounted to the support. The shroud comprises a tubular elbow having an inlet end and an outlet end. The shroud is mounted with a long side of the elbow including a drain port facing downward. An atomizing nozzle is mounted at the inlet end of the elbow and aligned with an axis of the elbow at the inlet end. The nozzle is connected, in use, to a water supply and an air supply. The diffuser produces a dry fog exiting shroud at the outlet end of the tubular elbow.
A dry fog diffuser comprises a support. A shroud is mounted to the support. The shroud comprises a tubular elbow having an inlet end and an outlet end. The shroud is mounted with a long side of the elbow including a drain port facing downward. An atomizing nozzle is mounted at the inlet end of the elbow and aligned with an axis of the elbow at the inlet end. The nozzle is connected, in use, to a water supply and an air supply. The diffuser produces a dry fog exiting shroud at the outlet end of the tubular elbow.
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