{HEAD ~ Known systems} for recovering {TAIL ~ heat} from refrigeration plant make no distinction between the different kinds of heat being recovered and use both low and high grade heat together to raise the temperature of say a water tank 
{ HEAD ~ Known systems } for recovering { TAIL ~ heat } from refrigeration plant make no distinction between the different kinds of heat being recovered and use both low and high grade heat together to raise the temperature of say a water tank
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH