In a cogeneration plant, combustion gases at 1 atm and 1000 K are used to preheat water by passing them through 6-m-long 10-cm-diameter tubes. The inner surface of the tube is black, and the partial pressures of CO2 and H2O in combustion gases are 0.12 atm and 0.18 atm. respectively. If the tube temperature is 500 K, determine the rate of radiation heat transfer from the gases to the tube.
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