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that with the decrease of the column quantity, the

enhancement by volume increase becomes larger.

If the column quantity is sufficiently large, even

the volume proportion is very small, the heat trans-

fer performance is good. For example, efficiency in

the coordinate point (volume 10%, number 200) is

almost equal to it in (volume 60, number 30). It is

particularly important to applications that need to

reduce weight.

5 CONCLUSION

1. Optimization of division of grids and distribu-

tion of columns in grids are both effective on

increasing the heat transfer performance. In

optimization of column distribution, as the

increase of shift number, the ...