Yes AD combined with CHP or even CHCP. What is all this acronym stuff eh?

AD is Anaerobic Digestion, its the sort of process that happens in a sewage works where all that nasty stuff is broken down by 'good' bacteria. What is left is largely safe but has given off lots of methane gas and CO2, along with some other trace stuff. Anaerobic means 'without Oxygen'.

Now that Methane is what we need. Its almost the same as Natural Gas that you buy at home. So it can be 'cleaned up' and sent down pipes to the gas mains or it can run a gas fired electricity generator.

But rather than just generate electricity, we also need to look at how effective the burning of gas in an engine really is. When gas is burned in say a modified car engine to drive a shaft to turn a generator to produce electricity, there are loses. These loses affect the efficiency of turning the energy value of gas into electricity. It is disappointing to discover that only around 20-25% of the gas burnt produces the electricity. The rest is 'low grade' waste heat.

Cooling Towers are designed to WASTE HEAT to the atmosphere

Article from Alternative Energy Africa: 23 Oct 2009 

As Eskom continues to debate the prolonging of projects, Kusile coal-fired power station continues to be the center of attention. However, Eskom CEO Jacob Maroga insisted that Kusile would remain on schedule.

“We are saying… let’s commit ourselves to ensuring that [Kusile] doesn’t stop, and to the extent that there is a [funding] gap, let’s see how we can close it,” Maroga said. “We want to continue with the build,” he stressed, adding that Eskom was also committed to closing what would be a R30-billion funding gap should the requested increases be granted.

Yet he also admitted that the state-owned utility was continually assessing the “shifting of certain cash flows” as well as the possibility of bringing in “other parties to assist with the build.”

Energy recovery is just what CHP is all about - recovering the waste heat from motors, or generators. This waste heat is thene used to provide hot water for heating or laundary. With the additionof absorbtion Chillers - chilled water can also be generated for use in air-conditioning systems