A dishwashing appliance, as provided herein, may include a cabinet, a tub, a pump, a spray assembly, a fluid recirculation duct, and a cold water line. The tub may be housed within the cabinet and define a wash chamber. The fluid recirculation duct may extend from a path inlet to a path outlet to recirculate air within the wash chamber. The path inlet may be defined in fluid communication between the wash chamber and the path outlet. The path outlet may be defined in fluid communication between the path inlet and the wash chamber downstream from the path inlet. The cold water line may extend through the fluid recirculation duct. The cold water line may define a cold water nozzle that is disposed within the fluid recirculation duct to provide a condensing, cold-water flow into the fluid recirculation duct between the path inlet and the path outlet.

A dishwashing appliance, as provided herein, may include a cabinet, a tub, a water tank, a wet air duct, a dry air duct, a water supply conduit, a diverter valve, and a diverted branch. The tub may be housed within the cabinet and may define a wash chamber. The water tank may be mounted within the cabinet outside of the wash chamber. The wet air duct may extend from the wash chamber to the water tank. The dry air duct may extend from the water tank to the wash chamber. The water supply conduit may extend to the wash chamber. The diverter valve may be disposed along the water supply conduit upstream from the wash chamber. The diverted branch may extend from the diverter valve to the water tank to selectively guide water from the water supply conduit to the water tank.

An auxiliary gray water supply device captures used wash water from a commercial warewashing machine for supply to a pre-rinse station without substantial modification of the commercial warewashing machine. The captured wash water and treatment agent are delivered to a pre-rinse station for pre-rinsing of dishes that will be washed within the commercial warewashing machine.

A dishwasher, in particular a household dishwasher, includes: a washing container having a washing compartment and which receives washing items to be cleaned; and a heat pump device which has an evaporator which is arranged within a tank filled with water. The tank is fluidically connected to the washing container and to a fresh water inlet device. The tank is arranged below the washing container and has a top wall facing a washing container bottom.

A household dishwasher includes a receiving compartment for receiving an item to be washed, a pump sump, and a heat pump assembly through which, during operation, a heat transfer medium flows. The heat pump assembly includes a plate condenser configured to enable a transfer of heat from the heat transfer medium to a washing liquor circulating in the household dishwasher. A spray assembly supplies washing liquor to the item to be washed. A first flow path extends from the pump sump to the spray assembly for conducting the washing liquor, and a second flow path extends from the pump sump to the plate condenser. Means are provided to prevent or hinder foreign matter that is swept along with the washing liquor from adhering to a washing-liquor-facing surface of the plate condenser, or to detach foreign matter adhering to the washing-liquor-facing surface from said surface.

A warewash machine includes a housing defining a ware inlet, a ware outlet and an internal chamber including a plurality of sequential spray zones including at least one wash zone and a rinse zone downstream of the wash zone in a ware conveyance direction. A vent path leads from the chamber leading to a vent outlet for connecting to a building ventilation system. A damper is provided for controlling a flow area at a location along the vent path. A controller is connected to control a position of the damper, the controller configured to adjust a position of the damper based upon input from at least a first temperature sensor, wherein the first temperature sensor is located at one of (i) the ware inlet, (ii) the ware outlet or (iii) along the vent path. Methods of operating a warewash machine are also provided.

A dishwasher according to the present invention includes a tub having a double wall structure so that consumption of energy is reduced using water or air stored in an inner space of the double wall structure of the tub in a washing process and consumption of water is reduced using the water stored in the inner space of the double wall structure in a next washing process.

A method for removing moisture from moist air in an appliance, such as a treating chamber of a dishwasher, wherein a drying system includes a condensing system and heat exchange systems that enhance condensation with both ambient air and cold water. The method includes storing cold water for use during a cycle of operation; recirculating the moist air in the treating chamber through a condenser; during the recirculating, flowing ambient air over the condenser; and during the recirculating and after the flowing ambient air, flowing the cold water over the condenser.

A conveyor type ware washing machine uses a heat pump to reduce exhaust heat and to heat incoming water. A modulating valve is used to control incoming water flow through a heat exchanger of the heat pump. Processing circuitry automatically dynamically adjusts the modulating valve between a plurality of open states based on the sensed refrigerant head pressure of the heat pump, so that the refrigerant head pressure is maintained in a predefined range. The ware washing machine is efficient, and reduces the amount of heat exhausted to ambient. Related methods are also disclosed.

The present invention relates to a method and apparatus for transferring heat energy from a waste-liquid, wherein the apparatus (100) comprises at least one heat exchange element (107) for transferring heat energy from waste liquid in a first container (101) to a first target fluid, at least one heat pump element (111) for transferring heat energy from waste-liquid transferred from the first container to the further container (102), at least one selectively operable exit-valve element (115) for selectively providing at least one fluid communication path for allowing waste-liquid to exit from the further container, and at least one controller element for selectively operating the heat pump element to transfer heat energy from waste-liquid in the further container to a further target fluid and/or for selectively operating the at least one selectively operable exit-valve element.