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Gold/Mining/Energy : Global Thermoelectric - SOFC Fuel cells (GLE:TSE)
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To: Gulo who wrote (2339)6/23/1999 11:56:00 PM
From: Gulo  Read Replies (1) of 6016
 
BTW, re: waste heat...

I thought I'd expand my last post a bit...

The term 'high grade heat' refers to a large difference in temperature between a heat source and ambient air (or water , etc.). The higher the difference, the easier it is to convert some of that 'waste' heat into useable energy. 'High grade' does not refer to the quantity of heat.

A small source of high grade heat, such as a fuel cell stack, can be efficiently used to generate (co-generate) electricity. Although the amount of actual heat energy is low, it is not difficult to capture it. Siemens does this with their SO fuel cells to boost the overall efficiency of their generator systems to 70% or more (~50% due to SOFC and 20% to a turbine generator run off the SOFC's high grade 'waste' heat). Note that the amount of electricity produced by the turbine is relatively small compared to the electricity produced by the fuel cells.

On the other hand, it is difficult to capture useable energy from even a large source of low grade heat. An example of a low grade source of heat energy is a greenhouse. Although the amount of heat energy trapped in a greenhouse can be very large, it is not concentrated enough to be useful.

Hope this helps some lurkers.
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