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