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WOFATI structures demonstrate remarkable effectiveness due to their unique design features and emphasis on passive systems. The "two-skin" system, characterized by a double layer of membrane, protects the structure from moisture, ensuring dryness and longevity. WOFATI designs prioritize the use of natural and locally sourced materials, primarily wood and earth, significantly reducing the building's environmental impact and embodying the "freaky-cheap" philosophy pioneered by Mike Oehler. The core principle of "Annualized Thermal Inertia" harnesses the earth's thermal mass to regulate temperature fluctuations, providing passive heating in the winter and cooling in the summer. Large windows strategically placed on the uphill side, along with a spacious gable roof on the downhill side, often incorporating glazing, maximize passive solar gain, further enhancing energy efficiency. By minimizing reliance on artificial heating and cooling systems, WOFATIs achieve substantial energy savings. Allerton Abbey, the first WOFATI built at Wheaton Labs, exemplifies the practicality and success of this building technique
A dry outhouse, a simple and sustainable alternative to conventional flush toilets and septic systems, is frequently discussed within permaculture circles as a means of minimizing environmental impact and maximizing resource utilization. This type of outhouse is characterized by a pit dug into the ground, strategically located on a higher elevation point to encourage water runoff and maintain dryness. Key design elements for a successful dry outhouse include a "no pee" policy, the use of ample sawdust for odor control and composting, and urine diversion mechanisms, particularly important for accommodating female anatomy. While concerns about groundwater contamination exist, proper placement, construction, and the incorporation of heavy-feeding trees or plants like willows in a "tree bog" system can mitigate these risks. Furthermore, the integration of a urine separator can significantly reduce the volume and toxicity of waste, facilitating easier composting and nutrient recycling. The dry outhouse, particularly when combined with urine diversion and careful management, offers a cost-effective and environmentally sound approach to sanitation, aligning with permaculture principles of resource conservation and closed-loop systems.
The lorena is a unique cooktop design created to optimize the performance of rocket stoves. This specialized cooktop features a metal plate with a central hole that sits directly above the rocket stove's burn chamber, allowing for direct heat transfer to large pots. The surrounding metal plate serves as an additional cooking surface, similar to the glass cooktop used at Allerton Abbey, offering flexibility for a range of cooking tasks. This design aims to maximize heat utilization from the rocket stove, promoting energy efficiency and faster cooking times. When a large pot is heated to the desired temperature, it can be moved to the surrounding cooktop, and the central hole can be covered with a piece of metal to retain heat. Proposed implementations often include integrating the lorena into an outdoor kitchen setting for added practicality. The lorena embodies the ongoing innovation within rocket stove technology, striving for better heat transfer and improved cooking performance.
WOFATI, an acronym coined by Paul Wheaton, stands for Woodland Oehler Freaky-cheap Annualized Thermal Inertia. It defines a type of earth-sheltered, passive building that blends affordability with energy efficiency. Inspired by the work of Mike Oehler, a pioneer of earth-sheltered building, WOFATI designs use locally sourced, natural materials, such as wood and earth, to minimize both cost and environmental impact. Central to the WOFATI concept is Annualized Thermal Inertia, which utilizes the surrounding earth as a thermal mass to moderate temperatures year-round. This means that the building stays warm in the winter by storing heat from the summer, and cool in the summer by retaining the coolness of the winter, greatly reducing the need for artificial heating and cooling. WOFATI structures typically have a large gable roof on the downhill side, and at least 35% of the uphill wall is made of glass or other light-transmitting material to maximize passive solar gain. WOFATI buildings are ideally situated on or near a woodland, emphasizing a harmonious integration with nature. Allerton Abbey, the first WOFATI, along with Wofati 0.8, are examples of this building style and can be found at Wheaton Labs.