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 {HEAD ~ a substantially parallel row} located in {TAIL ~ an upper portion} of the tube chamber, and said second tubes are mounted in a substantially parallel row located in a lower portion of the tube chamber 
located in
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 { HEAD ~ a substantially parallel row } located in { TAIL ~ an upper portion } of the tube chamber , and said second tubes are mounted in a substantially parallel row located in a lower portion of the tube chamber
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