Integrated Dishwasher Condenser for Faster Water Heating
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Solution Overview
Problem
Conventional dishwashers face inefficiencies in heating water, leading to prolonged washing times and energy loss, due to the use of electric heaters and complex waste heat recovery systems, which also require additional heat exchange apparatuses and result in insufficient heat exchange between refrigerant and water.
Innovation Solution
A dishwasher with a heat pump system that includes a condenser positioned inside the washing water guide for direct heat exchange, eliminating the need for additional heat exchange apparatuses and enhancing operating efficiency by facilitating latent heat absorption and evaporation, while also incorporating a controller to manage heating modes and energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a waste heat recovery device with a heat pump is used to recover heat from discharged washing water, then energy loss is reduced, but the number of parts and device complexity increase
Solution Approach 1:
The condenser is merged with the washing water guide structure, integrating the heat exchange function into the existing water circulation system. This eliminates the need for separate heat exchange apparatus while recovering waste heat from discharged water to preheat supply water.
Solution Approach 2:
The washing water guide structure serves multiple functions: it guides washing water to the spray arm and simultaneously acts as a heat exchange pathway where the condenser can preheat the water using waste heat from the heat pump system.
2Loss of energy
If washing water is heated using a heat pump with a condenser on the water movement path, then energy efficiency is improved, but heat exchange between refrigerant and washing water is insufficient
Solution Approach 1:
The condenser is integrated into the washing water guide structure, allowing direct thermal contact between the refrigerant in the condenser and the washing water flowing through the guide. This merging ensures efficient heat transfer from the refrigerant to the water without requiring separate heat exchange apparatus.
3Temperature
If a condenser is disposed on the washing water movement path with refrigerant pipe wound around the water pipe, then heat exchange is enabled, but heat exchange efficiency is insufficient and operating efficiency deteriorates
Solution Approach 1:
Instead of winding the refrigerant pipe around the water pipe, the condenser is merged with the washing water guide structure itself. This provides a larger and more direct heat exchange surface area, improving thermal contact between the refrigerant and washing water while reducing energy losses.
4Loss of time
If heat exchange between refrigerant and washing water is insufficient, then heating time is prolonged, but adding more heat exchange apparatus increases device complexity
Solution Approach 1:
The condenser is merged with the washing water guide structure, maximizing heat exchange efficiency within the existing system geometry. This integration provides sufficient heating capability without requiring additional separate heat exchange apparatus, thus reducing both heating time and device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces heating time, minimizes energy loss, and improves the overall efficiency of the heat pump, allowing for faster washing cycles and reduced energy consumption.
Implementation Method 1
a condenser provided inside the washing water guide to exchange heat in contact with the washing water of the washing water guide
Implementation Method 2
enhancing operating efficiency by facilitating latent heat absorption and evaporation
Data Source
AI summary
The present disclosure relates to a dishwasher having a heat pump, including a dishwasher body provided with a tub configured with a washing space therein and a sump provided at a bottom of the tub to temporarily accommodate washing water; a spray arm provided inside the washing space to spray washing water; a circulation pump that pumps the washing water of the sump; a washing water guide that guides the washing water pumped by the circulation pump to the spray arm; a heat pump provided with a compressor, an evaporator, an expansion apparatus, and a condenser provided to exchange heat in contact with the washing water of the washing water guide; and a controller that controls the heat pump to increase the temperature of the washing water of the washing water guide. As a result, it may be possible to suppress heat loss from being generated while heating washing water.