Climate change is an
inevitable process and all mankind must prepare to confront it. The global
survival strategy shall comprise of reducing man-made greenhouse gases and, at
the same time, of adapting to global warming. Honeycomb housing could be an
important urban and architectural element of this strategy.
When half a century
ago, my grandfather was taking care of his bees in our “Garden of Eden” in
Arad, Transylvania, I was often helping him with the hives. Although I’ve
experienced the kamikaze stings many times, I feel fortunate to have discovered
their marvelous world.
The beauty of the
hexagonal grid lies in its simplicity and flexibility. No wonder it was adopted
by Mother Nature when she created the honeycomb. The bee hive is one of the
most efficient and functional natural structures and can provide much
inspiration to architects. The honeycomb concept achieves the main objectives
of sustainable design: reduced use of land and natural resources, environmental
protection and self-sufficiency.
The concept is based on
prefabricated hexagonal modules with a central dome and clerestory skylight.
The modules are covered with soil, leaving only the domes exposed. They provide
access, natural light and ventilation to the living space below. This
configuration allows each unit to have two entrances, one at the lower street level
and the second from the rooftop garden. The design incorporates an optional
central lift, making each dwelling wheelchair accessible to all levels. This
flexhousing™ feature is essential considering the growing elderly population
and the large number of persons with reduced physical mobility. Sheltered
vehicular access and parking are provided at the lower level.
In existing urban
areas, the honeycomb concept could be used to reclaim lands with unattractive
or hostile environments where traditional housing would not be appropriate.
Such lands may include infill lots near highways and other pollution sources,
and “brown” or contaminated fields, where artificial re-grading would in fact
rehabilitate the land and create green space. Such re-development would
contribute to urban intensification, which is an essential component of
sustainable development.
In a honeycomb village,
the spatial separation between buildings, which in conventional subdivisions
results in much wasted land, is practically eliminated. Each hexagonal module
has its own independent walls, achieving complete privacy and noise control.
The structure is made of reinforced concrete, is noncombustible and can be
designed to withstand earthquakes and other impacts. The honeycomb concept also
offers great flexibility within the hexagonal grid, in terms of unit layout
& size, and most importantly, in terms of site planning. Of course, the
feasibility of this concept depends on the acceptance of communal land and
building ownership, not different from a condominium development.
Honeycomb housing would
also provide protection against severe weather events which are occurring more
frequently because of climate change, such as extreme heat waves and storms. It
could be most appropriate in geographic zones with inhospitable climate, such
as deserts, hot (i.e. Sahara) or cold (i.e. the Arctic). In the more distant
future, the honeycomb concept could be used to develop human settlements on
Moon and Mars.
The following two figures illustrate a
sample village of approx. 12 hectares (29.65 acres) with 260 dwellings, made up
of two symmetrical communities located both sides of the transportation
corridor. The residential area alone covers 8 ha (19.77 ac). The settlement can
be easily expanded and/or planned in many other shapes.
Each dwelling is
located within walking distance from public transportation. Figure1 illustrates
a two-way railway track, developed in the median of the highway, which could be
a streetcar or an elevated high-speed monorail. The train station is at the
centre, with sheltered linkages to all major facilities required by the
community. In extreme climates, these facilities can be developed inside large geodesic
domes that would enclose the open spaces between buildings. Small scale
live-work units including retail and personal service shops can be developed
along the pedestrian pathways leading to the residential clusters, creating the
Main Street.
Orientation, both above
and below ground, and the identification of each individual dwelling, is an
important issue. Extensive mapping and signage will be required, combined with
a variety of treatments of the walls in terms of finishing materials and
colours, for easy identification. Fortunately, we live in a communication age
and an electronic guidance system could be easily developed.
Being exposed to the
sun, without shadows from buildings, the rooftop gardens are ideal for leisure,
play and gardening. The layer of soil prevents heat loss or gain, keeping the
interior warm in the winter and cool in the summer. It works ideally as a heat
sink in the desert climate with large day-night fluctuations of temperature.
A walk through the
rooftop gardens along the trails connecting the entrance doors to the domes
would reveal a rolling landscape, with drainage creeks and small ponds,
vegetable gardens and orchards. Some domes could support windmills; others
could have greenhouse extensions.
The clerestory domes
can be expanded with greenhouses, which could also be used to grow fruits and
vegetables in a protected and controlled environment. Poultry and small
domestic animals could also be raised. The rooftops could also accommodate
septic beds for sewage treatment, which would become an integral part of a
natural recycling process where everything is reused.
The following figure is a sample of
rooftop gardens above the school area
The central courtyards
created by dwellings in alternative X can be enclosed with geodesic domes. In
addition to playground and pool, these climatically controlled spaces can be
used for year-round food production. The size of a courtyard and dome can be
enlarged by increasing the perimeter with more dwelling units, thus providing
the opportunity for creating mini ecosystems.
The concept is based on
several types of prefabricated hexagonal modules with a footprint of 30m2 (or
323 sq.ft.) in both alternatives. The roofs of all modules are shaped as
truncated hexagonal pyramids for optimum spatial, structural and water drainage
performance. The optimum configuration is subject to detailed structural design
and testing.
Two alternative designs
are proposed: alternative X has one-storey units with glazing open onto an interior
courtyard, while alternative Y has two-story units without windows (with the
exception of entrance domes and skylights) and must rely on specially developed
light wells in order to receive natural light. A specific site can use either
alternative, or a combination.
Section and Plan of Alternative X
There are two types of
modules: XA and XB for interior space, both on one level, and one module XC to
cover outdoor dwelling space and vehicular area. Both modules XB1 and XB2 are
provided with doors and windows that open onto the central courtyard (a geometric
effect of the hexagonal pattern).
Module XA provides the
main entrance from the street and the access to the rooftop garden, through a
clerestory dome. The core of this module incorporates a stair revolving around
an optional lift which would make all levels accessible to people in wheelchair
and could also be used for moving heavy objects. This module also accommodates
the hallway, the kitchen and a washroom.
The interior layout of
module XB is developed for various residential functions: XB1 for living and
dining, XB2 for bedrooms and XB3 for bathrooms, laundry and storage. An average
two-bedroom dwelling unit of 120 m2 (1292 sq.ft.) gross floor area, requires 4
modules: XA + XB1 + XB2 + XB3.
Section and Plan of Alternative Y
There are two types of
modules: YA and YB for interior space, both on two levels that can be adapted
to various residential functions. A third module YC, with the same footprint
and with optional skylight, can be used to cover outdoor space and the street.
Module YA provides the
entrance from the street and the access to the rooftop garden through a
clerestory dome. The core incorporates a stair revolving around the optional
lift. This module also accommodates the entrance hall, the kitchen and a
washroom on the lower level, and a bathroom, the laundry with storage and
cupboards on the upper level.
Module YB has a
clerestory dome with a sunwell that bring light to the lower level used for
living and dining. The upper level accommodates two bedrooms and an ensuite.
They are all lit from the clerestory dome. Module YC is supported by columns
that follow the wall pattern of modules YA & YB and can be adapted for
larger openings required by driveways and parking. An average two-bedroom
dwelling unit of 120 m2 ( 1292 sq.ft.) gross floor area, requires 1 module YA +
1 module YB.
Elements for further
Research & Development
The elements of the
concept listed below, not necessarily in their order of importance or priority,
need further design, research or testing. The ultimate goal in developing these
elements is to enable the community to become self-sufficient in water, energy,
and waste treatment. Ultimately, a life scale prototype of several modules
shall be constructed to allow the research and development of the ensemble.
Structural Design and
Testing
The superior structural
performance is not only based on the vaulted shape of the individual modules,
but also on their interlocking with each other in the hexagonal grid. Following
the detailed structural design, a working model shall be built to experiment
with various stress scenarios. The exact configuration dimensions, reinforcing
and concrete composition of the prefabricated modules shall be established for
optimum function and efficiency. Developing the best method of prefabrication,
transportation and erection are also crucial for the economic viability of the concept.
Passive Solar System
The concept applies the
principles of passive solar heating. The clerestory windows welcome the winter
sun to penetrate in an optimal fashion. Then, the inside surfaces of the dome
(painted white) reflect the sun’s rays toward the walls and floor. There is a
great thermal benefit from having a large area of exposed concrete surface at
floors, walls and ceilings. Concrete has a high thermal mass and will absorb
the excess heat on sunny days, store it and release it when the indoor
temperature drops. The only heat loss (or gain) will occur through the windows
of the clerestory domes. To minimize this heat loss (or
gain), the walls and
roof shall be insulated and the windows could get special treatment described
below at Insulating Windows and Insulating Adjustable Louvers.
Photovoltaic Solar
System
The above ground
exposed surfaces, such as the roofs of the domes can be clad with photovoltaic
panels. These could be developed as shingles or roofing membranes using
Nanosolar technology. The utility switch, inverter and batteries can be located
on the upper hall near the hydrogen generator.
Hydrogen generation
The surplus electric
energy collected from the photovoltaic panels and windmills can be used to
produce Hydrogen and Oxygen from water, through hydrolysis. Hydrogen then can
be used to produce energy as needed, with power cells or other types of
generator. The Hydrogen tanks can be stored under the soil, protected from heat
and vandalism. The Hydrogen, Oxygen and Nitrogen generating equipment is
located on the upper hall near the door to the roof top garden.
Insulating Windows
Both alternatives have
a larger clerestory dome with vertical windows and an entrance door. Module YB
also has a smaller clerestory, shaped like a truncated hexagonal pyramid, with
slanted windows that direct the solar rays into the Sunwell Distributor.
All windows will have
the exterior panes made of one-way safety glass for privacy and security and
will be provided with external adjustable louvers. The motorized louvers will
be developed for sun and thermal control. The double glass panels
will be designed as transparent air-tight containers, connected to reservoirs
at top and bottom; thousands of tiny beads of insulating foam will be blown in
and sucked out by an air pump, as required. The insulating beads would increase
the thermal resistance value of the glazing to the level of the insulated
walls.
Adjustable Insulating
Louvers
The clerestory windows
are provided with insulating louvers mounted on the outside. These are made
adjustable to take into account orientation and time of the day and can be
operated by electric motors, which can be controlled by a computer. The same
computer can control the insulating windows.
Ventilation and Air
System
The Oxygen obtained
from water through hydrolysis will be used to improve and could even create the
indoor air. Carbon Dioxide will be released, or consumed, by plants, through
photosynthesis. Nitrogen will be produced by the waste treatment system. The
quality of the interior air can be controlled and the intake of exterior air
can be reduced or even shut off completely, depending on outdoor pollution
level. This would become very important in case the outside air would become
contaminated.
Water System
Rainwater is filtered
through the various layers of soil, flows down the sloped roofs, and is
collected by perforated pipes placed along the valleys of the hexagonal grid,
flows down vertical pipes placed at the intersection of three modules into
cisterns located below the floor slabs. A series of pipes placed under the
floor slab along the perimeter of the hexagons connects the cisterns into a
network. From here, the water is pumped up into storage and distribution tanks,
located above the kitchens and bathrooms. These tanks will also be provided
with exterior taps for filling up from water tankers or fire trucks as needed.
Hose bibs will be
distributed over the entire area and a dripping pipe network for efficient use
of water could be incorporated. All surplus water resulting from rain or
watering the gardens is collected and recycled.
If necessary, the issue
of high or fluctuating underground water table can be addressed as part of a
storm management study required for each specific location. This would involve
soil engineering and possibly incorporating a grid of drainage pipes (or
weeping tiles) placed under the floor slabs. This grid could be connected to
the water network. The storm water management may require the creation of
collection pools and creeks which could be incorporated into the park’s
landscaping (as illustrated in Figure 2). These pools and creeks would also
contribute to irrigation and to creating a tempered microclimate for the
rooftop gardens.
Geothermal System
In colder areas,
despite all heat loss preventive measures, the dwelling will need a back-up
heating system. Radiant floor heating is probably the most efficient and
comfortable way to supplement passive solar heating. In a desert climate, a
similar system would cool the floor. It may make sense to incorporate a
geothermal system as an underground heat exchanger to make use of the difference
of temperature between the surface and the underground soil. It could be very
cost effective, as it would not require additional excavation and it could use
the underground piping network of the water system.
Waste Treatment and
Recycling
The toilets will be
flushed with “grey water”. The waste water from toilets will be collected in a
septic tank. From here the sewage will go through a complex process involving
filtering and aerobic bacterial treatment. The water can be used for gardening
and the solid waste as organic fertilizer. The methane gas produced can be used
as fuel for back up generators and to extract Nitrogen.
Plant Growth in
Artificial Soil
The rooftop gardens are
artificially created; therefore the composition of the soil layers used to
cover the hexagonal modules must be researched. Subject to its properties, some
of the original soil may be reused as base material for filtering. The use of
organic fertilizers and the integration of waste treatment shall be studied for
creating the top soil and its maintenance with minimum or no import required.
Security System
The transparency of the
above ground domes and greenhouses, with no hidden corners, makes the rooftop
gardens safer than in conventional housing green space. A network of
surveillance cameras and motion detectors can be installed and monitored from a
central station and from each unit as well, allowing close observation of children’s
playing and other activities. The vehicular access would be controlled through
gated checkpoints.
Orientation
Without special
measures, the uniformity of the underground streets and buildings could make it
difficult to find an address. In addition to visible and well lit signs and
house numbers, such measures can also include colour-coded walls and
identifying features, sculptures, etc. An orientation and mapping system
similar to GIS can be developed to enable the residents and visitors to easily
locate their destination.
Geodesic Dome Ecosystem
The courtyard created
between dwellings can be enclosed with a glazed geodetic dome to create a mini
ecosystem. This could be the subject of a special research program.
Sunwell (for
alternative Y)
In alternative Y,
conventional livingroom windows are replaced by sunwells. A Sunwell consists of
three main parts: the Receptor, the Conveyor and the Distributor. The Receptor,
mounted on top of the clerestory dome of module B, has a rotating dish of
mirrors, follows the sun and reflects solar radiation into the Sunwell Receptor
tube. This has specially developed layers of glass which would reject harmful
rays, but would allow light to penetrate into the Sunwell Conveyor. The
Conveyor has specially coated and textured surfaces, acting as mirrors that
convey the light waves down the well towards the Distributor. The Distributor
is located in the centre of the raised ceiling of the living/dining area and
will reflect the light onto the sloped ceiling. The entire cathedral ceiling
becomes a giant naturally lit chandelier.
Simulated Sunny
Environment
To counteract the main
drawbacks of an underground living space, mainly loss of direct sun exposure
and view of the exterior, a simulated sunny environment could be introduced.
The Honeycomb concept
offers a housing solution that reconciles modern human needs with protecting
the natural environment. It also provides a practical way to make use of lands
which are not suitable for conventional housing. In this respect, Honeycomb Villages
would be an integral part of sustainable development.
Another benefit of the
Honeycomb is that it could provide housing in extreme climates, becoming an
intrinsic part of our adaptation strategy; it could even be considered for
future Lunar and Martian settlements.