The results showed that: the content of oxygen in the deionized water was lower than 20 μg/L after it flew through the two cation redox resins in three working conditions which were fluid bed,downstream bed and floating bed under the different temperatures,which met the demand for cool water used in dynamos;on the contrary,the content of oxygen in the de.

Derived in the paper are mathematical models of heat and mass transfer for parallel flow type and counterflow type closed wet cooling tower(CWCT).

The temperature changing rules of counter and parallel flow, including phase changing flow are given after theoretical analysis using the principle of heat transfer.

By the analysis and comparison between the parallel flow mode and the counter - flow mode used in heat exchangers of the R407C room air conditioner, the paper points out that counter -flow mode has a better performance of the heat transfer than that ot the parallel flow mode.

Model calculation and analysis of heat and mass transfer of air and water in a direct contact forward flow;

A new technique that layer of carbon-bearing pellets is heated and direct reduced under conditon of parallel-flow heating with pre- heated air is put forword.