A method of operating a dishwashing appliance includes filling the sump of the dishwashing appliance with an initial fill of water of a current operational cycle and measuring a temperature of the initial fill of water. The method also includes comparing the temperature of the initial fill of water to a reference temperature and calculating an energy demand for the dishwashing appliance to heat the initial fill of water to the reference temperature based on a heat rise rate. Based on the calculated energy demand, for example based on a comparison of the calculated energy demand with a predetermined energy demand for an external heating unit, the dishwashing appliance decides whether to heat the initial fill. The heat rise rate may be calculated during a characterization of the dishwashing appliance prior to the current operational cycle.

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 system for monitoring the operation of a commercial dishwasher (2), which is embodied as a box-type dishwasher or as a conveyor dishwasher, includes at least one temperature sensor (60) designed to record a temperature profile with respect to time which corresponds to the temperature profile with respect to time to which an item of washware is subjected when it is treated in the dishwasher (2). The system further includes an evaluation device (62) designed to receive and to evaluate the temperature profile recorded by the at least one temperature sensor (60), wherein the evaluation device (62) is further designed to ascertain a value of a notional unit of quantity of heat from the temperature profile recorded by the temperature sensor (60). A dishwasher (2) including a corresponding monitoring system and a method for monitoring the operation of a dishwasher (2) are also provided.

A dishwasher and method utilize one or more sprayers to generate steam within a wash tub of a dishwasher by directing one or more sprays of fluid onto a heating element disposed in the wash tub of the dishwasher.

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.

Provided is a structure of a sump assembly of a dishwasher. The dishwasher includes a tub forming a washing chamber, and a sump assembly provided at a lower side of the washing chamber and configured to store washing water in the washing chamber, wherein the sump assembly includes a sump housing having a water storage chamber storing the washing water and a sidewall portion forming the water storage chamber, and a heater provided on the sidewall portion to apply heat to the washing water stored in the sump assembly. The heater includes a planar heating element, and the planar heating element provided in a cylindrical shape forms the sidewall portion.

A method of operating a dishwashing appliance includes filling the sump of the dishwashing appliance with an initial fill of water of a current operational cycle and measuring a temperature of the initial fill of water. The method also includes comparing the temperature of the initial fill of water to a reference temperature and calculating an energy demand for the dishwashing appliance to heat the initial fill of water to the reference temperature based on a heat rise rate. Based on the calculated energy demand, for example based on a comparison of the calculated energy demand with a predetermined energy demand for an external heating unit, the dishwashing appliance decides whether to heat the initial fill. The heat rise rate may be calculated during a characterization of the dishwashing appliance prior to the current operational cycle.

A conveyor warewasher for cleaning washware includes at least one washing zone at least one rinsing zone and a conveyor apparatus for conveying the washware therethrough. A camera system is arranged above or below or to the side of the conveyor apparatus and is configured to capture at least one image of an area of the conveyor apparatus. An evaluation device is configured to evaluate and determine on the basis of the classification performed whether, at the time of the image capture, at least one of the following categories of washware was present in the area of the conveyor apparatus: cutlery or pieces of cutlery; pots, pans, or GN containers; glasses, in particular drinking glasses; trays or tray-like objects; plates, cups, or bowls; utensils; other washware; mixed washware; plastic washware; or no washware.

A dishwasher includes a tub, a spray arm, a sump, a pump body including a partition that partitions the pump body into a first chamber and a second chamber, a communication hole defined in the partition, a pump channel that connects the sump to the first chamber, an arm channel that connects the spray arm to an interior of the second chamber, an impeller located in the second chamber and configured to rotate to supply water to the arm channel, a heating unit configured to heat water stored in the first chamber, a steam channel that connects the first chamber to the tub, and a channel controller configured to, based on rotation of the impeller, supply water that passes through at least one of the sump, the pump channel, the second chamber, or the arm channel to the steam channel to close the steam channel.

A beverage container washing system may utilize a heated wash fluid circulation system to circulate wash fluid retained in a line between a tank and a sprayer to enable fluid that is supplied to the sprayer to be maintained at a suitable temperature for washing and/or sanitizing a beverage container, and in many instances regardless of the amount of time between wash cycles.