Mining the archive
Our permaculture past revealed through stories from Permaculture International Journal.
In this article from edition 45, December-February 1993 of Permaculture International Journal, Robyn Francis discussed options for reducing our energy use..
Author: Robyn Francis.
Mining the archive series editor: Russ Grayson.
Design with energy in mind
Permaculture designer, Robyn Francis, looks at a variety of design strategies for using energy responsibly and sustainably.
Energy, in an holistic sense, involves much more than electricity and the use of fossil fuels, although these are certainly central to the energy issue. In permaculture design, energy and resource management are virtually synonymous and it is often difﬁcult, if not impossible, to separate the two.
The statistics quoted in this article are for Australia, as they are the facts that are available to me, but the trends and general concepts can be applied to any industrialised society and need to be carefully considered by developing countries in the rapid process of ‘modernisation’.
Domestic Energy Use
The most tangible form of energy, in terms of understanding and immediate action, that most of the people living in homes in Australia use, is electricity. This accounts for 20 percent of the country’s total energy in electricity and fossil fuels, with 8.3 million private motor vehicles consuming almost another 20 percent. So in the household, with electricity and motor vehicle use, there is immense scope to have an impact on 40 percent of the national ‘energy’ picture. These two factors also account for nearly 40 percent of Australia’s total carbon dioxide emissions.
Another aspect close to the heart of every household is the issue of waste. This can be seen as energy lost, a loss that also incurs a lot of energy in both its generation and disposal. Domestic waste makes up 71 percent of Australia’s garbage, over six million tonnes a year.
It is important to remember that although industry is guilty of consuming even more energy and generating more waste than domestic activities, it is largely our support as consumers using their products, and our consumption of imported goods (resulting in the need to over-produce for export), that helps perpetuate the industrial process.
At this point one could easily diverge into political aspects of the picture, so I think it appropriate to get back to the point of what we can do in a realistic and practical way.
As individuals we can approach energy and resource conservation on three different levels: behaviour, design and technology.
(Janet MacKenzie takes a close look at behaviour in her article in this issue on p 22, so I will deal with only design and technology.)
Design strategies — skylight versus electric light
Appropriate house design creating a comfortable indoor climate can substantially reduce the heating bill in winter and cooling bill in summer. The average Melbourne house uses around 50 percent of its energy on heating. The use of thermal mass, insulation and ventilation, the addition of well-placed pergolas, verandahs and glass houses and the design of surrounding landscape can support and enhance the house microclimate.
Windows and skylights can be designed to make better use of daylight — it amazes me just how many buildings need the lights on in the middle of the day to read. There are many excellent books available on passive solar and energy conserving house design to explore, not only for building a new house but also for renovating or retrofitting an existing house.
Beyond the Home
There are numerous ways we can approach energy conservation in design beyond the home, in the garden, in our neighbourhood and on the farm. Often, we need to import energy in the form of resources to get a system going — things like seeds, plants, mulch and manures to establish our gardens and orchards, bulldozers to construct swales and dams to collect water. When we design our strategies in time and consider these initial inputs as capital investment, we need to ensure that they will yield many times that investment over their lifespan.
A fruit tree will yield many times its initial investment cost if it’s well managed, but not if we drive many kilometres every year to collect manure and straw to mulch it. We need to design the system surrounding the fruit tree so that its needs are met on site. We can plant comfrey and lucerne as a living mulch under the tree to provide some of its nutrient needs and give a chicken a good life providing it with manure and managing its pests.
Don’t just plant a windbreak, plant a sun trap, bird habitat, bee forage and fuel source, some wild foods and a fire break — these are all things a windbreak can do with good design and plant selection, and consider the energy saved by stacking all those functions into that one element. These are basic permaculture design principles that address energy conservation in a very practical way.
The principles of zonation are similar, looking carefully at the inputs a particular species or system requires for maintenance and harvest, and placing it according to convenience within the landscape. For example, the chickens need to be visited twice a day for feeding, collecting eggs, letting into the orchard to forage and to be locked up safe from the fox at night. What else needs to be done on a daily basis that can be linked along the pathway to the chookhouse? It can be the vegetable garden, compost heap, wood heap, nursery — to name a few. So zonation conserves the time and energy we would have wasted if we had spread things all over the place.
In the design of human settlements, communities and villages, much energy in the form of providing services can be saved through cluster placement of housing. Design can reduce motor vehicle use by ensuring that social and commercial centres and facilities are within easy walking and cycling distance of residential areas, and preferably the two should be integrated as in traditional village cultures. A rural community l consulted for earlier this year consisting of 23 adults, located about 20 kilometres from town, spent over $55,000 a year on motor vehicle maintenance and running costs.
Technological strategies — solar, pedal power and gravity
Here we need to consider the appliances and technologies that consume energy and the technologies that generate energy. In south-east Queensland (subtropics), 50 percent of domestic energy is used for water heating — imagine what could be saved if building codes made solar water heaters compulsory!
The major electricity consumers in the home are:
- water heating (30 percent)
- space heating (22 percent)
- refrigerators (14 percent)
- cooking (9 percent)
- lighting (6 percent)
- freezers (4 percent)
- TV and VCR (4 percent)
- clothes washers (3 percent)
- clothes dryers (3 percent)
- dishwashers (3 percent)
- airconditioning (2 percent)
These percentages are the national average (ANZEC, 1990).
Good solar house design, solar hot water systems and energy efficient appliances can make a big dent in domestic energy consumption. Also, gas is cheaper than electricity, less polluting and generally more energy efficient.
Wood stoves can be used for cooking and space heating but do check their energy efficiency rating and remember that fire wood costs. Energy is used in cutting and transporting firewood, and collecting and cutting it yourself also costs time, effort and often fuel for chainsaws and transport. In dense urban situations wood and coal stoves and heaters are a major source of air pollution during winter. Most of the non-grid appliances (gas and DC) are more expensive than regular AC appliances and all appliances represent energy in the extraction and processing of their raw materials, manufacture, distribution and ultimate disposal. This all needs to be assessed.
Water conserving devices such as control flow shower roses not only save water but also energy to heat water. Nearly 40 percent of domestic water consumption can be eliminated by installing water conserving devices like dual flush toilets, aerating taps in hand basins and sinks and front loading wash machines. Rainwater collection tanks should be standard practice along with greywater recycling for garden irrigation. Use gravity where possible to eliminate the need for pumping.
In remote situations where stand-alone water and energy systems are necessary, good design and choice of appliances are critical.
Where homes are connected to a central water supply and grid power, good design and conservation are equally critical if we are concerned about our long term security.
Checklist for technology systems, appliances and building materials
- does it conserve/save energy
- is it resource-conserving
- is it efficient (inputs vs yields or doing the job)
- what are its costs/benefits in terms of energy, materials, maintenance, life span, disposal and economic liability
- is is durable/repairable
- is it recyclable
- is it non-polluting
- does it use local resources/materials
- does it suit local conditions
- is it necessary — what alternatives are there and how do they compare to the above criteria.
Private motor vehicle use
In Australia every year:
- 33,214,300,000 km are travelled commuting to and from work
- 67,311,600,000 km are travelled for other private purposes
How people commute to work in Adelaide (1991):
- motor car (drivers) 51%
- motor car passengers 17%
- public transport 16.8%
- walk 10.4%
- bicycle 3.3%
- motorcycle 0.9%
The author of this piece, Robyn Francis, now operates the Permaculture College Australia from her Nimbin, northern NSW, Australia smallholding, Djanbung Gardens.