New trigeneration system optimal for developing world

Newcastle University in England is leading a consortium to develop a trigeneration system, which looks to be ideally tailored to suit developing countries.

Science Daily reports that the system, fuelled entirely by raw plant oils, could have great potential for isolated homes and businesses operating outside grid systems both in the UK and abroad.

The project is being funded by the Engineering and Physical Sciences Research Council (EPSRC) through the RCUK Energy Programme, and the small-scale combined cooling, heat and power system has been designed to provide dependable electricity without the need for a mains connection.
Tony Roskilly
Ideally suited for small-holdings and businesses, and particularly applications in the developing world, the waste heat that is produced by the system is used for cooling and heating in order to recover the maximum amount of energy.

At the same time, the team have incorporated advanced electrical storage into the system to make it even more efficient and more able to cope with the daily fluctuating demand for electricity.

The consortium also included researchers from University of Leeds, University of Ulster, and three Chinese universities.

"The challenge," explains Professor Tony Roskilly, of Newcastle University, "was to design a system that could simultaneously satisfy the more predictable needs for heating and hot water, as well as the wildly varying demand for electricity in a small dwelling."

"Our solution was to incorporate advanced electrical storage into the system, both batteries and the latest supercapacitors, combined with innovative system control."

The solution entails a generator that runs constantly at high efficiency, coupled to the electrical storage system so that it can easily match sharp peaks in electrical demand when required. Waste heat is captured and stored via hot water tanks for heating and hot water needs. Cooling for refrigeration or air conditioning via an absorption chiller can also be run off the waste heat.

"Energy storage unlocks the key to the most efficient use of the trigeneration system," says Professor Roskilly.

To make the system even greener, and more appropriate for the developing world, the team has also shown the system can be powered by biofuels.

"We wanted to avoid running the trigeneration system using biodiesel or other highly-processed fuels from raw materials," says Professor Roskilly. "So instead, we developed a system for using the oils obtained from pressing crop seeds, like those from jatropha and croton.

"These crops can grow in harsh environments and on poor-quality land and so could be well-suited to providing fuel in developing countries, as cultivating them would not adversely affect food production. The potential demand for this technology in such countries is very large."

The team involved in this project are also planning a follow up project to develop a system that can refrigerate and process food crops, to reduce post-harvest losses.



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