Once you start listening for climate positive stories or examples you’ll find lots to be inspired by. I’ve heard quite a few of them over the last 18 days. Here are seven quick examples of organisations that have saved money and greenhouse gas by cutting their use of energy.

1. University of New South Wales mail centre – Fuji Xerox helped them achieve a 23% reduction with new copiers and printers / consolidation of machines.
2. Airbus – the new A380 uses 40% less fuel per passenger km than aircraft of 25 years ago.
3. Google server rooms – use less than half the energy of a typical server room of the same capacity.
4. Dell computers saved over USD$1 million by improving the computer switch off practices of its staff.
5. The leading Sustainability Street (a program run by Vox Bandicoot) – cut greenhouse emissions by 49%.
6. Gaden’s Lawyers cut energy consumption by 20% through behaviour change. No capital cost.
7. Logistics company Linfox is aiming to cut its emissions by 15% by 2010. A driver training program is already making a significant contribution to the achievement of this target.

Now that’s climate positive! How much could you save?
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(Part Two) The first part of this topic was published on the 8th of May.

Flat Plate Solar Collectors

Flat panel (aka flat plate) collectors work on the principle of copper pipes running through a glass covered collector, often connected to a water storage tank on the roof. The hot water can then thermosiphon itself in and out of the tank, thus heating the water. Finally the hot water is gravity fed into the house from the roof. This is an extremely efficient way of gaining and storing hot water and can be over 90% efficient in the right climate. The simplest combination is the close-coupled system (see photo below).
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The federal government’s $8,000 rebate to householders installing a PV system runs out on 30 June. Time is running out if you want to take advantage of the rebate, which you are eligible for you if you own a home and your household income is less than $100,000 a year.

If you do an internet search or scan the papers you can find at least two companies offering a 1kW grid connect solar system for free, excluding the metering. You have to assign the installer the RECS (Renewable Energy Certificates) to get the system at this price, and may have to pay extra for variations to a standard install such as fitting it to a tiled roof. Considering the historical price of PV systems, the free offer is very good indeed. If you don’t already have a PV system - consider getting one now - but you should be quick, some of the free offers are expiring at the end of May or early in June.
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During energy audits, our team often finds situations where walls or partitions have been moved or an extension has been added to a building and the electrical and mechanical services have not been considered. This leads to reduced occupancy comfort and energy wastage. The major energy saving opportunities lie in the duct design and the lighting layout. The following case study examines the opportunities brought about by re-examining duct design.

(part 1) HVAC opportunities

The following diagrams show a case study of an existing duct layout where an extension has been added on the west facing windows of the office. Measuring the flow rates of the packaged units servicing the area alerted us to the fact that air velocities were excessive and fresh air rates were greater than 10 litres per second per person.
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If you know much about climate change you’ll know that cows and sheep produce a lot of greenhouse gas. In fact a cow can produce around 200 litres of methane a day, and methane has global warming potential 23 times greater than carbon dioxide. To put that into context thats 1.2 tonnes of greenhouse gas a year per cow, a bit over one quarter of the greenhouse gas produced by a car over a year. I once did an audit of a large business that grazed cattle basically to keep grass under control (it was by no means their core business), and the cattle accounted for 10% of their carbon emissions. Needless to say I recommended they switch to grazing kangaroos, which don’t produce methane.

As reported by MX The town of Ghent in Belgium has now declared Thursday a vegetarian day to help reduce carbon emissions. All government departments and schools are banning the consumption of meat on Thursdays.
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