The apparatus 1 comprising a cooling means, said cooling means being constructed with a least one of said modules; wherein said plurality of first tubes in each said module are mounted in a substantially parallel row located in an upper portion of the tube chamber, and said second tubes are mounted in a substantially parallel row located in {TAIL ~ a lower portion} of {HEAD ~ the tube chamber} 
The apparatus 1 comprising a cooling means , said cooling means being constructed with a least one of said modules ; wherein said plurality of first tubes in each said module are mounted in a substantially parallel row located in an upper portion of the tube chamber , and said second tubes are mounted in a substantially parallel row located in { TAIL ~ a lower portion } of { HEAD ~ the tube chamber }
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 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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD