1. 
   Waste heat
   Waste heat sometimes called Secondary heat or Low-grade heat refers to heat produced by machines, electrical equipment and industrial processes for which no useful application is found. Energy is often produced by a heat engine, running on a source of high-temperature heat. A heat engine can never ...
   Found op http://en.wikipedia.org/wiki/Waste_heat
   
   
2. 
   waste heat
   (Learning Modules / Geography / Geography of energy) Heat arising as an accidental byproduct of energy use.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   waste heat
   waste heat The portion of the energy input to a mechanical process that is rejected into the environment.
   Found op http://www.wordinfo.info/words/index/info/view_unit/3642/2
   
   

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