Design Problem
Creating an off-grid water heating solution for baths can address several problems of global significance:
1. Energy Independence and Resilience
● Problem: Many areas around the world, especially in developing countries or remote locations, lack reliable access to energy grids. This can make basic needs like hot water for bathing a challenge, especially in cold climates.
● Solution: Off-grid water heating solutions, such as solar thermal systems or biomass heaters, provide a way to generate hot water independently of the energy grid. This can reduce dependence on fossil fuels and improve quality of life in areas without reliable electricity.
2. Reducing Carbon Emissions
● Problem: Traditional water heating methods often rely on electricity or fossil fuels, contributing to greenhouse gas emissions.
● Solution: Off-grid water heating solutions, particularly those using renewable energy sources like solar power or biomass, can significantly reduce carbon emissions by replacing or supplementing fossil fuel-based systems. This contributes to global efforts to combat climate change.
3. Access to Clean Energy
● Problem: In many parts of the world, people rely on inefficient and polluting methods to heat water, such as burning wood or using kerosene. These methods can have negative health impacts and contribute to deforestation.
● Solution: Off-grid water heating solutions using renewable energy can provide cleaner, safer alternatives, improving public health and helping to preserve natural resources.
4. Economic Development
● Problem: In many developing regions, the cost of energy is a significant barrier to economic growth. High energy costs can limit access to essential services like hot water.
● Solution: By providing a cost-effective, sustainable method of heating water, off-grid solutions can reduce household energy costs, freeing up resources for other needs and supporting local economic development
By addressing these issues, off-grid water heating solutions can play a role in promoting sustainability, equity, and resilience on a global scale.
My Design Process for an Off-Grid Water Heating System
Research
My journey started with lots of iterations and brainstorming. I knew I wanted to use copper, but that was all I had in mind. To get inspired, I watched countless YouTube videos on off-grid water heating systems, but they were mostly manual and non-insulated fire setups, which didn’t feel innovative or reusable. After researching rocket stoves, I designed a system with a coiled copper pipe inside the stove, relying on convection to create a self-sustaining pump. Although I discovered this idea wasn’t original, I was still inspired to create and improve it.
Define
I aimed to design a system that would use minimal fuel and incorporate the efficiency of a rocket stove. I wanted it to be modular and include a filtration system since many off-grid systems don’t address water cleanliness.
Develop
I made a few sketches and got help from Bernard, who built multiple prototypes of rocket stoves. I encountered challenges with airflow and proportions, so I worked with my team to modify the design.
Create & Trial
To coil the copper pipe, I had to fill it with sand to prevent crimping. This process was tedious, but eventually, the coil fit perfectly in the stove. During testing, I faced issues like leaks from poorly connected pipes and rubber washers melting due to heat. I fixed these by improving the pipe connections, adjusting the stove’s structure, and switching to heat-resistant materials.
Test & Improve
In the first test, the water only reached 43°C after 40 minutes—too low for a hot tub. I tried a bigger copper pipe for better heat transfer, but coiling it was more difficult due to its weight. After more trial and error, I used better quality flame-proof pipes and created a setup that could work with both gas and rocket stoves.
Final Design
I sketched a modular design that fits either a rocket or gas stove. The copper pipe uses convection to circulate water, heating it efficiently. The system now minimizes fuel use, keeps water warm, and can be adapted for various setups.