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Geothermal Heating and Biofilter Integration in a Compact Microhouse

Authors:
Geuncheol Ha, Hyunmyung Kim, Seong Ryeong Kim, Minjae An
Geothermal Heating and Biofilter Integration in a Compact Microhouse
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Incorporating a movable bedroom module and a rainwater biofilter system, this compact microhouse offers innovative solutions for sustainable living in a limited footprint.
5 key facts about this project
01
Incorporates a movable bedroom module for flexible space use.
02
Features a rainwater biofilter for sustainable water management.
03
Utilizes solar panels for energy self-sufficiency.
04
Includes geothermal heating for efficient climate control.
05
Designed with a hexagonal shape to optimize spatial efficiency.

The Hexa_Zone microhouse takes a thoughtful approach to compact living, addressing the growing demand for efficient and sustainable housing solutions. Situated in a suburban area, the design highlights the importance of utilizing a small footprint to create a comfortable and practical home environment. The overall concept revolves around the idea that a smaller space can provide the same sense of comfort typically found in larger homes.

Design Concept and Layout

The structure features a hexagonal shape, allowing for maximum use of space while being economical in material consumption. It is organized into six functional zones: an entrance, toilet, kitchen, deck, bedroom, and study. These zones are interconnected by a multifunctional area that promotes easy movement and adaptability among the spaces. This layout ensures that each part of the home can serve multiple purposes, making it flexible for daily tasks.

Movable Module

A key highlight of the design is the movable module that serves as a bedroom. Positioned above the deck, this module can rotate and shift in front of the porch, providing a unique way to engage with both indoor and outdoor areas. This feature not only enhances the overall usability of the home but also offers a fresh perspective on how spaces can interact with each other.

Sustainable Features

Sustainability is a central theme of the microhouse, with a rainwater purification system that incorporates a biofilter for effective treatment of water. This system provides clean water for everyday use, which is an important aspect of resource management. Energy needs are met with solar panels that generate electricity, paired with a solar water heater that offers hot water. Together, these elements contribute to a self-sufficient energy model, lessening environmental impact.

Heating and Mobility

The indoor environment is further improved with a geothermal heating system that keeps the space warm during colder periods. This system circulates heat throughout the areas, ensuring comfort for residents. Additionally, the project encourages the use of electric kickboards for local travel, promoting eco-friendly transportation in the suburban context.

The design incorporates thoughtful storage solutions, allowing residents to keep essential items organized and accessible. Each aspect of the microhouse is carefully planned to balance functionality with a practical approach to living in small spaces. Attention to detail shows that effective design can enhance the quality of life, even in compact environments.

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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

Buildner's Unbuilt Award 2025

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 October 2025

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