{TAIL ~ The tube bundle} is sealed within a shell, which is a sealed chamber through which a working liquid, such as {HEAD ~ water}, is circulated and is heated by the hot tubes 
{ TAIL ~ The tube bundle } is sealed within a shell , which is a sealed chamber through which a working liquid , such as { HEAD ~ water } , is circulated and is heated by the hot tubes
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH