Portable Water Heater With Gravity Flow and Temperature Control
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Solution Overview
Problem
Existing portable water heaters are inefficient in heating large quantities of water to precise temperatures for outdoor use, often requiring bulky equipment, high energy consumption, and posing handling risks due to boiling temperatures.
Innovation Solution
A portable, temperature-controlled water heating system with a compact and lightweight design, utilizing a heat exchanger and temperature-responsive valve to efficiently heat water to user-selected temperatures using various heat sources, such as campfires or stoves, while minimizing weight and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water is heated to boiling point using conventional portable water heaters, then water can be heated, but handling risks increase and energy efficiency decreases
Solution Approach 1:
The patent changes the target temperature parameter from boiling point (100°C) to a lower, skin-safe temperature (38°C). The temperature-responsive valve is calibrated to maintain water at approximately 38°C, preventing scalding risks while still providing sufficient heat for outdoor hygiene. This parameter change eliminates the harmful effect of high-temperature handling risks.
2Temperature
If water is heated to boiling point, then water heating is achieved, but energy efficiency decreases due to phase change
Solution Approach 1:
The patent changes the heating target from boiling point to 38°C, avoiding the energy-intensive phase change from liquid to gas. By maintaining water at a lower temperature below the boiling point, the system eliminates the latent heat of vaporization energy loss, significantly improving energy efficiency for outdoor water heating applications.
3Ease of operation
If thermosiphon system is used for water heating, then water circulation is achieved, but heating time increases significantly
Solution Approach 1:
The patent replaces the passive thermosiphon circulation system with an active pump-driven flow system. The pump mechanically forces water through the heat exchanger at controlled rates, enabling much faster heating times (12 minutes for 15 liters) compared to the passive density-driven circulation of thermosiphon systems which take an hour or more.
4Productivity
If mechanical pumping system is used, then water heating efficiency improves, but device weight and complexity increase
Solution Approach 1:
The patent employs a self-service approach where the flowing water itself provides the driving force for circulation through the heat exchanger. The system uses the water's own kinetic energy and pressure differential to maintain flow, eliminating the need for heavy mechanical pumps and batteries. This achieves efficient water heating with minimal added weight and complexity.
5Measurement precision
If precise temperature control is implemented, then skin-safe water temperature is achieved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control system using a temperature-responsive valve that automatically adjusts water flow based on temperature sensor input. The sensor continuously monitors water temperature and provides feedback to the valve, which modulates flow to maintain the setpoint of approximately 38°C. This feedback mechanism achieves precise temperature control without requiring complex electronic control systems or multiple components.
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
The system quickly heats 15 liters of water from 15°C to 38°C in approximately 12 minutes, achieving accurate temperature control within 1.5°C of the set point, with a total system weight under 0.9 kg and a compact size, suitable for outdoor use without the need for batteries.
Implementation Method 1
Energy is absorbed efficiently from a heat source such as a camp fire, backpacking stove, or burner assembly, warming the water to the temperature setting selected
Implementation Method 2
A portable, temperature-controlled water heating system with a compact and lightweight design, utilizing a heat exchanger and temperature-responsive valve
Data Source
AI summary
An apparatus and method for portably heating water for the purpose of showering or cleanup. A flow of water, originating from a supply container, is warmed as it passes through a heat exchanger transferring energy from a heat source. The heated flow of water is deposited into an accumulating container. The water temperature is actively and automatically controlled by a temperature-responsive valve. Responding to the temperature of the flowing water, the temperature-responsive valve varies the flow of water so as to produce an accurate water temperature within the accumulating container. The flow of water is gravitationally motivated by a pressure head differential between the supply container positioned at an upper elevation and the accumulating container positioned at a lower elevation.