February 2013 Issue (files are in PDF format)
Concentric ring heat store
A set of five slides (from a presentation made at the Renewable Heat Policy and Technology workshop held in Toronto on Jan 31) shows how the local energy sources that surround our buildings can meet all of the thermal needs of the building. A working example is proved, along with a generalized system diagram that covers most building types. Such systems need only about 5 metres of borehole per kW of capacity, making them inexpensive to build.
The risks of using natural gas produced by fracking
In addition to being unacceptable because of the high-GHG emissions that result from escaping natural gas this source of energy is also fraught with problems of ground instability caused by the fracking procedure, groundwater pollution from the chemicals, and a danger of financial instability that has arisen from speculation as outlined in this link.
Lossless storage of core heat
A concentric ring heat store loses some of the energy that is injected into the core during the summer but soon after the start of the heating season that form of loss disappears. That means that heat injected into the core during the winter is recovered at a high temperature and with only a very small heat loss through the ends of the storage cylinder.