Dishwasher Hot Start Control for Peak-Rate Energy Saving
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Solution Overview
Problem
Household dishwashers consume excessive energy and water during peak demand periods due to automatic hot start features, leading to higher utility costs and increased energy usage, necessitating a solution to manage energy consumption dynamically.
Innovation Solution
A dishwasher controller that communicates with the utility to switch between normal and energy savings modes, adjusting operation schedules, delaying cycles, and selectively deactivating power-consuming features like the hot start feature based on peak demand signals, allowing users to override and minimize energy usage during high-cost periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the automatic hot start feature is enabled to ensure effective wash performance, then wash quality is improved, but energy and water consumption increases during peak demand periods
Solution Approach 1:
The dishwasher controller dynamically adjusts the hot start feature based on real-time energy rate signals from the utility. When high or critical rates are detected, the controller disables the automatic hot start feature, allowing the dishwasher to proceed without multiple fill attempts. This dynamic adaptation resolves the contradiction by making wash performance reliable when energy rates are normal while reducing energy consumption when rates are high.
Solution Approach 2:
The system changes the operational parameter of the hot start feature (from enabled to disabled) based on energy rate conditions. The controller monitors utility rate signals and modifies the hot start behavior accordingly, transforming a static feature into a conditionally adjustable one that balances wash performance with energy cost management.
2Temperature
If the automatic hot start feature repeatedly fills the dishwasher to purge cold water, then water temperature requirement is met, but water consumption increases significantly
Solution Approach 1:
The hot start feature is dynamically controlled based on utility rate signals. During high or critical rate periods, the controller disables the automatic hot start, preventing multiple fill attempts and the associated water waste. During normal rate periods, the feature operates as designed to ensure adequate water temperature, thus resolving the contradiction between temperature requirement and water conservation.
Solution Approach 2:
The system modifies the operational parameter of water filling behavior based on energy rate conditions. When high rates are detected, the controller changes the fill parameter from multiple attempts to single attempt, reducing water consumption while accepting that the incoming water may not be fully purged of cold water.
3Ease of operation
If the dishwasher operates during peak demand periods, then user convenience is maintained, but utility costs increase due to higher energy rates
Solution Approach 1:
The controller receives real-time feedback from the utility regarding energy rates and uses this information to make operational decisions. The feedback mechanism allows the system to adjust its behavior based on current rate conditions, enabling users to maintain convenience during normal operation while automatically reducing costs during high-rate periods without requiring user intervention.
Solution Approach 2:
The dishwasher autonomously manages its operation in response to utility rate signals, eliminating the need for users to manually adjust settings or monitor rates. The system self-adjusts by disabling the hot start feature during high or critical rates, allowing users to benefit from cost savings while maintaining ease of operation.
Data Source
AI summary
A dishwasher is provided comprising one or more power consuming functions and a controller in signal communication with an associated utility. The controller can receive and process a signal from the associated utility indicative of current cost of supplied energy. The controller operates the dishwasher in one of a normal operating mode and an energy savings mode based on the received signal. The controller is configured to change the power consuming functions by adjusting one or more of an operation schedule, an operation delay, an operation adjustment, and a selective deactivation of at least one of the one or more power consuming functions to reduce power consumption of the dishwasher in the energy savings mode. The controller may modify or disable the hot start feature either prior to a wash cycle, or at an early stage of the first prewash cycle, including if a consumer elects to override the prompted energy savings mode.