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Ventilated nests remove heat and gas: mound-building termites

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Termite mounds in Moremi Game Reserve / Phil Zrim / LicenseCC-by-nc-nd - Attribution Non-commercial No Derivatives

Mounds of macrotermitine termites maintain homeostasis through tunnels, chimneys, and use of wind creating pressure fields.

BIOMIMICRY TAXONOMY
Summary
Macrotermitine termites construct mounds that maintain a constant internal temperature due to their structure and interaction with the local environment, rather than use of expensive, external energy sources. Several factors allow mounds to stay 87° F inside--the optimum temperature for the fungi these termites cultivate--while the temperature ranges from 35° - 104° outside. For instance, the mounds' thermal mass has sufficient heat capacity to buffer the internal environment from heat gain during the day with cold accumulated over the night; narrowing shafts rising through the mound channel and accelerate the release of warm internal air out vents at the mounds’ top; and openings at the base of the mound allow cooler, denser air to flow in replacing warmer air as it rises. These principles informed the design of the Eastgate Center, built in Harare, Zimbabwe, in 1995, which uses about 35% of the energy required for temperature regulation as similar conventional office buildings and saved building owners USD 3.5 million up-front, because they did not need to buy an air conditioning system for the building.
Excerpt
"The macrotermitine termites build some of the most spectacular animal-built structures on the planet. Some, like the mound of Macrotermes michaelseni...are dominant landscape features over much of southern Africa. These termites control a significant portion of the flows of carbon and water through arid savanna ecosystems. These remarkable structures are not the residence for the colony--very few termites actually are found in them. Rather, they are accessory organs of gas exchange, which serve the respiratory needs of the subterranean colony, located about a meter or two below the mound…Functionally, these mounds are devices for capturing wind energy to power active ventilation of the nest. They are adaptive structures, continually molded by the termites to maintain the nest atmosphere. This ability confers on the colony emergent homeostasis, the regulation of the nest environment by the collective activities of the inhabitants." (Turner no date)

"Heat generated by the termites and their gardens in the core of the nest flows into the collecting pipes and rises in the chimneys at a rate of about five inches per minute. As this humid CO2-rich air flows up the chimneys it draws cooler air in through the cellar area under the nest, where it begins to flow up into the various chambers…The buttresses are riddled with tiny holes too small even for the termites but large enough for the warm stale air to diffuse out while cooler fresh air percolates in." (Gould and Gould 2007:139)
About the inspiring organism
Mound-building termites
Macrotermes michaelsei

Habitat(s): Grassland, Savanna
Learn more at EOL.org
Organism/taxonomy data provided by:
Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist

IUCN Red List Status: Unknown

Bioinspired products and application ideas

Application Ideas: Use for low-cost ventilation of buildings.

Industrial Sector(s) interested in this strategy: Construction



Experts
Dept of Biology
Scott Turner
SUNY-ESF
Rapid Manufacturing Research Group
Rupert Soar
Wolfson School of Engineering at Loughborough University
References
Gould, James L; Gould, Carol Grant. 2007. Animal architects: building and the evolution of intelligence. New York: Basic Books. 324 p.
Learn More at Google Scholar Google Scholar  

Turner JS. 2000. Architecture and morphogenesis in the mound of Macrotermes michaelseni (Sjöstedt) (Isoptera: Termitidae, Macrotermitinae) in northern Namibia. Cimbebasia. 16: 143-175.
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Comments

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emily
over 5 years ago
Also a great example of Life's Principle "Integrating cyclic processes through feedback loops" They sense humidity, temperature, needs of fungal gardens and responds appropriately.
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emily
over 5 years ago
Great example of Life's Principle "Self-organizing" Leveraging interdependence via self-organizing: termites don't have a central command. As a social insect, they create self-ventilating towers that are above their nests. Group constantly monitors temp humidity to adjust.
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mcgovejw
over 6 years ago
This strategy is fascinating. The termites work constantly to open and close individual ventilation shafts to regulate the temperature. I just don't know how they know which ones to open and close and when to do it.
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