An apparatus for the evacuation of warm, moist air or vapor from a dishwasher cabinet or other washing machine interior. A centrifugal fan draws the hot air and water vapor out of the washing cavity through a flue riser and discharges it into a cooling chamber with one or more cooling spray nozzles. The cooling spray nozzles spray a fine mist of cold water into the stream of heated air and vapor, and may spray at angle to the flow of the stream of heated air and vapor. As the heated air and vapor from the dishwasher and the cooling spray mix, heat is transferred from the heated air and vapor to the cold water or mist being sprayed into the air stream. This reduces the temperature of the vapors and air that was extracted from the dishwasher. As the temperature is reduced, the water vapors condense and form droplets which accumulate on the sides and bottom of the cooling flue. This reduced temperature and moisture air is then discharged to the room at an opening, which may be located slightly above the bottom of the flue cabinet, along with the condensate.

A dishwasher includes a drying system that incorporates a mixing conduit that mixes air streams from an exhaust fan that draws humid air from a wash tub and a mixing fan that draws ambient air from the surrounding environment of the dishwasher to lower a dew point of the air that is exhausted by the dishwasher. In some instances, an additional inlet fan may be used to direct ambient air into the wash tub, and in some instances, the ambient air drawing into the mixing conduit by the mixing fan may be untreated.

A dishwasher includes a drying system that incorporates a mixing conduit that mixes air streams from an exhaust fan that draws humid air from a wash tub, an inlet fan that supplies ambient air to the wash tub, and a gate device that is movable within a range of positions to regulate fluid flow through at least one of first and second inlets of the mixing conduit. A controller may perform a multi-stage drying operation that, in a first stage, controls the gate device while the inlet fan is deactivated, and in a second stage, additionally controls the speed of the inlet fan while controlling the gate device.

Provided herein is a domestic appliance for washing goods that may include a washing compartment for receiving goods to be washed, and a heat pump arrangement, adapted to heat washing liquid to be used in the washing compartment. The heat pump arrangement may include an evaporator arranged to collect heat from ambient air, and a condenser arranged to dissipate heat to the washing liquid to thereby heat the washing liquid. The heat pump arrangement may further include a variable speed fan arranged to force the ambient air through the evaporator.

An automatic dishwasher having a tub defining a treating chamber and a housing physically separate from the tub and defining a sump to receive liquid sprayed into the tub, the housing having an inlet fluidly connected to a liquid outlet of the tub and an outlet fluidly coupled to a sprayer located within the tub to define a recirculation path for the sprayed liquid.

A clean status indicator is disclosed for use with a cleaning device such as a dishwasher. At least one weight sensor may be configured to sense the weight of objects within the washing compartment. In some approaches at least one temperature sensor is configured to monitor a change of temperature occurring within a washing compartment. A visual display is positioned within a housing for conveying a clean/dirty status of objects within the washing compartment. A controller is in communication with the at least one sensor and the visual display. The controller includes a status logic receiving data from the at least one sensor to determine the clean/dirty status of objects within the washing compartment and display the clean/dirty status on the visual display.

A warewash machine for washing wares includes a chamber for receiving wares, the chamber having at least one wash zone. A waste heat recovery unit is arranged to transfer heat from exhaust air of the machine to incoming water traveling along a water flow path through the waste heat recovery unit to a booster heater of the machine. A refrigerant medium circuit includes at least a first condenser arranged to deliver refrigerant medium heat to the incoming water. A control arrangement monitors subcooled refrigerant medium condition and responsively modifies operation of one or more of: (i) speed of a compressor of the refrigerant medium circuit, (ii) speed of an exhaust fan that causes air flow across the waste heat recovery unit or (iii) speed of a pump that controls incoming water flow along the water flow path.

A system for protecting a dishwasher from freezing using components within a dishwasher. The system comprising: a control circuit, a heating element, a water pump, drain hose, hot water supply, water valve, door sensor to determine whether dishwasher door is closed and a temperature sensor.

An automatic dishwasher having a tub defining a treating chamber and a housing physically separate from the tub and defining a sump to receive liquid sprayed into the tub, the housing having an inlet fluidly connected to a liquid outlet of the tub and an outlet fluidly coupled to a sprayer located within the tub to define a recirculation path for the sprayed liquid.

An automatic dishwasher having a tub defining a treating chamber and a housing physically separate from the tub and defining a sump to receive liquid sprayed into the tub, the housing having an inlet fluidly connected to a liquid outlet of the tub and an outlet fluidly coupled to a sprayer located within the tub to define a recirculation path for the sprayed liquid.