dimensions, scales, and measures of environmental design
DESCRIPTION
Following the 2008 "Re-imaging Cities: Urban Design After the Age of Oil symposium, Penn IUR solicited manuscripts on environmental and energy challenges and their effect on the redesign of urban environments.TRANSCRIPT
Working Paper
Dimensions, Scales, and Measures of Environmental Design William W. Braham
“Systems that reinforce their productive processes develop and displace those that do not.” -‐-‐H. T. Odumi
Sustainability has never been a very useful measure for designers, though it has
become a nearly ubiquitous design goal. The concept of “sustainable development”
originated as a compromise between the growth and no-‐growth positions within the
environmental movement, promising the admirable goal of growth within limits, or growth
with minimal impact, though the question quickly becomes “how sustainable is sustainable
enough”? It has proven to be a useful term for indicating a general ethic or direction, but
like the addition of “green” or “smart” or “clean,” sustainable has largely come to mean
“somewhat better than we are currently doing.” The successes and failures of the term may
largely be due to its generality, but in common usage there are two deeper problems with
the concept: it relies on a basic ethic of restraint and a static notion of nature.
From an ecological perspective, any form of design involves a diversion of resources
from some other activity and the development of new arrangements and configurations.
Even in the most restrained forms—renovation or recycling—human design and
construction use excess capacity in the pursuit of more resources. Put more directly, design
is the expenditure of power in the pursuit of more (or continued) power, even when it is
done with care and forethought. Power comes in many forms, and this formulation begs the
more philosophical question of “power to do what,” but the common view of sustainability
offers a deceptive picture of impact-‐free growth extending into the distant future. It is
perhaps closest to the discredited notion of the climax forest, a perfected ecological steady-‐
state of complex interdependence and industrious productivity attained in the temperate
DRAFT
Working Paper
biomes of Europe, Asia, and North America. While those great forests are models of
ecological richness, they are hardly peaceful or unchanging, either in their extents, their
mix of species, or their productivity. The system ecologist, H. T. Odum, was deeply critical
of the underlying assumptions of sustainable development because he saw that just as
natural systems were fundamentally dynamic entities competing for resources, so too were
social and cultural systems.ii Species, populations, temperatures, and markets all rise and
fall in the competition for power.
Observing that things ebb and flow in the competition for resources may seem
commonplace, but the task for designers is to develop concepts that provide more precise
guidance within the ever-‐changing systems into which their design are projected. Drawing
on the work of Odum and other ecologists, two immediate challenges present themselves
to designers: understanding the right scales or dimensions for environmental design
decisions and developing the right measures with which to evaluate them.
Scales and Dimensions
Architects are necessarily concerned with buildings and building sites, but
environmental flows and effects operate at many other scales and along other dimensions,
from the biochemical to the global. Herbert Simon has argued that all complex systems
organize themselves into discrete, interrelated, and hierarchical sub-‐systems.iii While he
uses the term “hierarchic” to describe their interrelationships, he means to include systems
with different kinds of structure and order, from the rigidly hierarchical cell-‐tissue-‐organ
structure of biological bodies to Deleuzian “bodies without organs” such as the weather
systems that produces transient sub-‐systems like high-‐pressure zones, cold-‐fronts, and
DRAFT
Working Paper
hurricanes.iv Simon makes the point about hierarchic systems to argue that different
problems or questions belong to specific sub-‐systems. Water use and storm run-‐off in a
building, for example, are questions about the capacity of the local watershed, while the
environmental cost and value of building products are now thoroughly global matters,
involving multiple, interconnected systems of manufacturing, transportation, installation,
and disposal. The first task of environmental design, then, is identifying the sub-‐systems
with which a project will interact.
The marvellous thing about complex ecosystems is the number and variety of sub-‐
systems involved, and the degree to which they operate at different scales, overlapping,
interpenetrating, and cooperating. Stationary elements like plants and trees (or buildings)
are penetrated by mobile populations of microbes, insects, and animals, and by equally
mobile flow systems of water and air, that facilitate subtle exchanges of materials and then
can suddenly transport vast quantities of the same material. The challenge for architects
has been the degree to which the discipline is conceived formally and spatially, as an
activity defined by formally visible boundaries, and whose modes of analysis and
representation privilege fixed and durable elements. Through the twentieth century
designers have developed and experimented with many methods for addressing the
dynamic aspects of buildings (and cities), from flow charts of construction sequences to
CFD analyses of temperature and air flow to parametric techniques for the description of
form. But as ecologists have also learned, the method of analysis and representation
depends on the question being asked and on the sub-‐systems involved or the boundaries
among the systems that are being considered.
DRAFT
Working Paper
As a starting point, it is important to consider the different scales and dimensions of
the systems within which buildings and building sites operate. The most intuitive form of
description for designers would be spatial scales, extending from the building footprint
and its site defined by ownership to its neighborhood, landscape, watershed, city, region,
biome, country, and continent, each of which involves different kinds of boundaries and
elements. As Simon suggests, environmental decisions have to be situated within the
relevant ecological sub-‐systems and many of these are firmly spatial. Sim Van der Ryn has
also argued that these different spatial scales are maintained by critical exchanges of
energy and materials between scales, so human design must consider these non-‐spatial,
linking systems as well.v
The situation is already even more complex. In the list of scales above, some are
defined by the sub-‐systems of ecosystems, while others are social and political entities, and
the two don’t often correspond. Or more precisely, human constructions and settlements
frequently begin with the scales and opportunities of natural systems and then grow to
exceed them. As Odum once observed, all material and energy flows are always already
doing some kind of work in the ecosystem, meaning there is no “free” material or energy,
only resources diverted from other uses. Design “with” natural systems begins as the
diversion of energy and material for human purposes, can quickly turn to over-‐use as
different thresholds of disruption are reached, but can also produce new hybrid
combinations of natural and human systems. The most spectacular hybrid so far has been
that between human civilization and the energy of ancient photosynthesis in stored in
fossil fuels. That hybridization has also produced epic disruptions in natural systems as it
DRAFT
Working Paper
converts that stored energy, so environmental design has sought to both understand and
ameliorate those disruptions and to develop new hybrids of equal power.
[INSERT FIGURE 1]
An equally critical set of scales, which emerged from studies of commercial office
buildings, are the temporal dimensions of buildings and their elementsvi (see Fig. 1). The
initial diagrams of office buildings prepared by Francis Duffy distinguished four “layers of
longevity” of commercial construction by the rate of their replacement, from the longer-‐
lasting building shell to the more frequently altered furnishings. That description
acknowledged real differences in duration, and helped formalize distinctions that exist
among the groups that design different elements, the depreciation periods written in tax
codes, and the kinds of buildings and design practices that develop in response. The “core-‐
and-‐shell” building, for example, and the tenant “fit-‐out” are different temporal dimensions
of the same building. Distinguishing them facilitates the changing of higher velocity layers
without disturbing the slower, more expensive ones. Subsequent studies further divided
those four layers into six, and then seven, layers, each distinguishing different kinds of
change in buildings.
One of the conclusions reached by many environmentally minded designers is that
the separation of such temporal layers improves the resource efficiency of buildings,
allowing for easier, less disruptive adaptations and more efficient recycling.vii In effect this
has involved the translation of commercial building practices to other types of
construction, with core-‐and-‐shell residential construction and the development of
residential fittings and appliances that move with the resident. But there is some limit to
this tactic when we recognize the other dimensions, or sub-‐systems, into which these
DRAFT
Working Paper
temporal layers can be divided. Elements of the same layer, the furniture and equipment of
an office for example, may be selected or purchased by different groups, have different
rates of technological obsolescence, or even be elements of different cultural fashions. The
Aeron desk chair, which became a characteristic element of the dot.com office is purchased
and used differently than the filing cabinet it sits next to or the carpet on which it rolls.
[INSERT FIGURE 2]
These examples add the even more complex questions of human use, display, and
meaning to natural and technological systems, further linking them to cultural, social, and
institutional sub-‐systems. The value of fresh water or of an expensive chair is negotiated
within a rich system of exchange in which scarcity values of all kinds are magnified and
enhanced. What is the built environment but the display of human wealth and power, not
merely as cultural symbols, but in the most precise terms of design? The decision about the
appropriateness of an Aeron chair for a particular setting is a matter of taste, fashion, and
budget, but a budget that reflects the total situation and resources of the individual or
institution for which it is intended. The value of the chair in this example derives from a
combination of the underlying scarcity of the “natural” energies and human labor required
for its production and the particular social and institutional niche for which is intended.
Human design has probably exceeded simple survival or shelter needs from the very start,
but the question about appropriate scale arises with the recognition of ecological
connections.
[INSERT FIGURE 3]
As the environmental movement has argued since the 1970s, the ultimate scale for
design is the biosphere (see Figure 3), but it is a biosphere of many sub-‐systems that are
DRAFT
Working Paper
largely and messily hybridized with human systems. The object of architectural design is an
entity of many scales and dimensions that focuses local and global systems to produce and
support a building for some period of time. Environmental design operates in both
directions, tracking all those scales and dimensions in their many connections and
evaluating the discrete projects that they enable. The first tool of environmental design
may be the ecological boundary diagram drawn around a project to track the various
exchanges and flows in natural, technological, and human systems. That boundary provides
a site for making visible the spatial, temporal, and institutional systems specific to the
project. But environmental design is not merely a question of the scarcity or efficiency of
the many flows across the project boundary, of simply using fewer resources. Any real
measure for environmental design has to take account of the accumulation of wealth and
the uses of power.
Measures
The opposition between scarcity and excess, or between efficiency and luxury, is
common to debates about sustainability, which are frequently framed in moral terms and
lead to the condemnation of waste and the lauding of frugality. The apparent paradox is
that natural systems exhibit no such restraint, growing to the limits of available resources
and increasing in complexity as they grow. I don’t mean to reduce environmental design to
a narrowly competitive, survivalist ethic. Natural systems typically grow through a variety
of forms of cooperative interactions whose interdependencies only increase as eco-‐systems
develop, so the challenge is to understand other forms of growth. The difference lies in the
scale of the explanation. George Bataille argued that while individuals and their economies
DRAFT
Working Paper
are necessarily governed by scarcity (and efficiency), that “living matter in general” is
governed by the steady and luxurious flow of energy from the sun, which must be
expended either in growth or in some form of “luxury”.viii With the term “luxury” Bataille
meant expenditure without immediate “return,” but that is itself a perspective of the
individual. Luxury is partly a question of which scale or system is considered and what
kinds of returns are accounted for. The prosperity and fecundity of eco-‐systems are what
matters, but that fecundity can be experienced as luxury by its individual parts.
The fundamental point made by Odum, which he had developed from Lotka’s work
linking energy use and evolution in the early twentieth century, was that natural systems
don’t compete to minimize their use of energy, but to maximize their power, their ability to
accomplish useful work.ix In seems as if that should be the same thing, as if a more efficient
use of energy would yield more power, but sustained maximum power only occurs at a
medium rate of efficiency and leads to a quite different ethic of design. In natural systems it
develops into a whole cascade of cooperative uses and feedback interactions that maximize
the total power flowing through the system.
During the energy supply crises of the 1970s, Odum used to scandalize his students
by saying it was folly for America to voluntarily renounce its use of oil, since it would just
be used by other countries to make themselves stronger. The point is twofold. The obvious
point is that resources will be used, so the critical decisions are how to use them well. The
more subtle point is that the systems which prevail over time are those that “reinforce their
productive processes,” meaning that they not only obtain more power, but enhance the
systems and processes that support them. From some perspectives the expenditures
involved in reinforcing productive processes may look charitable, wasteful, or luxurious.
DRAFT
Working Paper
William McDonough often cites the seemingly excessive number of blossoms and fruit on a
cherry tree as an expenditure that looks wasteful if measured according to the efficiency of
the tree itself, but whose waste serves as food, compost, shelter and supports other aspects
of the eco-‐system that supports it. Those luxurious display by the tree reduces its
efficiency, but increases the power and prosperity of the whole eco-‐system.
It is, or course, difficult to measure prosperity, especially when we remember the
dynamic ebb-‐and-‐flow nature of any complex system. As marketing specialists know well,
the luxuries of one generation become the needs of the next, and that cycle easily and
quickly reverses itself when conditions change. Odum’s measure of prosperity combined
his argument about useful power with the system diagram of the whole biosphere, enabling
him to start with original environmental energies—solar, tidal, and geologic—and trace the
sequence of energy transformations through which they pass. He coined a new term,
“emergy,” to describe the cumulative memory or embodiment of energy involved in the
cascade of transformations, with “solar emergy” as the common unit, so all comparisons or
measurements were in similar units. He developed that emergy approach into an elegant
accounting system, though it involves many approximations, and together with the total
system diagram, captures much of what we seek when we ask about sustainability.x
Systems prosper that manage to maximize their flow of solar empower.
[INSERT FIGURE 4 HERE]
The vital aspect of Odum’s accounting is the emergy diagram itself, which uses
systems language to describe the cascade of energy transformation, feedback, and recycling
required in a complex eco-‐system. It is the richness of interaction that “reinforces
productive processes,” and for which environmental design needs some measure or tool for
DRAFT
Working Paper
evaluation. Ulanowicz has used information theory to calculate the amount of order in a
system, which he combined with the total flow of resources to develop a simple numerical
measure of system prosperity, but it seems to be the emergy diagramming that offers the
most potential as a design tool.xi The potential of these diagrams for design have barely
been tapped, and can reveal the kinds of interconnection and recycling opportunities that
designers turn to instinctively, but whose evaluation has been limited to their role in single
processes. The levels of complexity developed in natural systems can be difficult to
understand, or design, when the scale of analysis is too modest. Diagramming the spatial
and temporal dimensions described above can also extend the potential of the diagrams in
design projects, identifying new sites for innovation. Odum’s law of maximum empower
offers an antidote to the paradoxes of sustainability, acknowledging the pursuit of power
necessary to all forms of growth, while providing a model of the cooperative prosperity
that sustainable design has sought.
i Howard T.Odum, Environment, Power, and Society for the Twenty-First Century: The Hierarchy of Energy (New York: Columbia University Press, 2007). p. . ii Howard T.Odum and Elisabeth C. Odum, A Prosperous Way Down: Principles and Policies (Boulder: University Press of Colorado, 2001), p. . iii Herbert Simon, The Sciences of the Artificial, 3rd ed. (The MIT Press, 1996). iv Manuel DeLanda, A Thousand Years of Non-Linear History (New York: Swerve Editions, 1997). v Sim Van der Ryn and Stuart Cowen. Ecological Design (Washington, DC: Island Press, 2005), p. 51. viFrancis Duffy, The Changing Workplace (London: Phaidon Press, 1992). vii Ed van Hinte et al. Smart Architecture (Rotterdam: 010 Publishers, 2003), p. . viii Georges Bataille, The Accursed Share: An Essay on General Economy (New York: Zone Books, 1991). ix Howard T. Odum, Systems Ecology: An Introduction (New York: Wiley, 1983). xx Howard T. Odum, Environmental Accounting: EMERGY and Environmental Decision Making (New York: Wiley, 1996). xixi Robert E. Ulanowicz, Ecology: The Ascendent Perspective (New York: Columbia University Press, 1997).
DRAFT
Working Paper
29. Dimensions, Scales, and Measures of Environmental Design William W. Braham
Figures
Figure 1. Temporal layers of building design
Figure 2. Herman Miller Aeron Chair
DRAFT
Working Paper
Figure 3. Emergy diagram of the biosphere
Figure 4. Emergy diagram of a university campus
DRAFT