Point-of-Use Heating Showerhead with Pressure-Sensitive Overheat Control
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Solution Overview
Problem
Consumers experience heat loss in water as it travels from a distant water heater to a faucet, necessitating a point-of-use heating solution at the faucet location.
Innovation Solution
A showerhead with an integrated heating element that heats water directly at the point of use, utilizing a coaxial pipe design with a wet and dry chamber to house electrical components and a curved heating element within a waterway, controlled by a pressure-sensitive switch to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If water is heated at a distant water heater and transported to the faucet, then the water heater can be centralized and efficient, but heat loss occurs during transport through pipes
Solution Approach 1:
The heating function is extracted from the centralized water heater and relocated to the point-of-use showerhead. The showerhead includes an integrated heating element that directly heats water at the faucet location, eliminating heat loss during transport through pipes while maintaining centralized heating efficiency.
Solution Approach 2:
An intermediary heating element is introduced between the water supply and the user. This heating element, integrated into the showerhead, acts as a local heating mediator that compensates for heat loss by reheating water at the point of use without requiring complete decentralization of the heating system.
2Temperature
If a heating element is integrated into the showerhead, then water temperature is maintained at the faucet, but the showerhead structure becomes more complex with wet and dry chambers
Solution Approach 1:
The showerhead is segmented into distinct wet and dry chambers. The heating element is housed in the dry chamber, isolated from water flow, while the wet chamber handles water delivery. This segmentation allows the heating component to be integrated without compromising structural integrity or creating leakage issues.
Solution Approach 2:
The heating element and electrical components are nested within the dry chamber of the showerhead structure. The waterway is positioned to flow around the heating element, creating a nested arrangement where the heating system is contained within the overall showerhead assembly without requiring separate external components.
3Ease of operation
If electrical components are housed in the showerhead, then point-of-use heating is achieved, but safety risks increase due to water and electricity proximity
Solution Approach 1:
Electrical components are extracted from the water flow path and housed in a separate dry chamber. The heating element is positioned such that it can transfer thermal energy to water without direct electrical contact with water, isolating the electrical system from moisture while maintaining heating functionality.
Solution Approach 2:
The heating element serves as an intermediary between the electrical system and water. Electrical energy is converted to thermal energy in the heating element, which then transfers heat to water through thermal conduction without direct electrical-water contact, eliminating the safety hazard while maintaining point-of-use heating capability.
4Reliability
If a pressure-sensitive switch is added to prevent overheating, then safety is improved, but the device complexity increases
Solution Approach 1:
The pressure-sensitive switch is integrated into the existing water flow path of the showerhead. It automatically activates the heating element when water flow is detected and deactivates it when flow stops, allowing the system to self-regulate without external control mechanisms or additional power requirements.
Solution Approach 2:
The pressure-sensitive switch provides automatic feedback control by monitoring water flow conditions. When water flows through the showerhead, the switch detects the pressure change and activates heating; when flow stops, heating is automatically deactivated, creating a simple feedback loop that prevents overheating without complex control systems.
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
Effectively maintains water temperature at the faucet by directly heating it, ensuring consistent warmth and preventing overheating through pressure-sensitive control.
Implementation Method 1
A showerhead with an integrated heating element that heats water directly at the point of use
Implementation Method 2
controlled by a pressure-sensitive switch to prevent overheating
Data Source
Figure 1
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AI summary
Provided herein is a point of use heating showerhead (1,15,45,145,180) comprising a feed pipe (20,50,175) coupled to a water input, a waterway (25,65,105,195) connected at a first end to the feed pipe (20,50,175), a heating element (10,40,60,130,165) in the waterway (25,65,105,195) and a sprayplate (35,100,160,225) connected to a second end of the waterway (25,65,105,195). In use water flows into the feed pipe (20,50,175) via the water input and/or via the feed pipe (20,50,175), and water is heated via the heating element (10,40,60,130,165) in the waterway (25,65,105,195). The heated water exits the showerhead via the sprayplate.