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By Douglas F. Twiss, & Annie R. Russell Reece H. Vallance

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Additional info for A textbook of inorganic chemistry vol.VII part II Sulphur, Selenium, and Tellurium

Sample text

If one component passes unchanged through a process unit it can be used to tie the inlet and outlet compositions. This technique is particularly useful in handling combustion calculations where the nitrogen in the combustion air passes through unreacted and is used as the tie component. 8. This principle can also be used to measure the flow of a process stream by introducing a measured flow of some easily analysed (compatible) material. 7 Carbon dioxide is added at a rate of 10 kg/h to an air stream and the air is sampled at a sufficient distance downstream to ensure complete mixing.

This technique is particularly useful in handling combustion calculations where the nitrogen in the combustion air passes through unreacted and is used as the tie component. 8. This principle can also be used to measure the flow of a process stream by introducing a measured flow of some easily analysed (compatible) material. 7 Carbon dioxide is added at a rate of 10 kg/h to an air stream and the air is sampled at a sufficient distance downstream to ensure complete mixing. 45 per cent v/v CO2» calculate the air-flow rate.

Overall heat transfer coefficient for the insulation as a function of thickness, U values (see Chapter 12): thickness, mm U. Wnr2 CC"! 15 Average temperature difference between inside and outside of house 12 °C; heating period 250 days in a year. Cost of insulation, including installation, $l20/m3. Capital charges (see chapter 6) 20 per cent per year. Cost of fuel, allowing for the efficiency of the heating system, 9c/MJ. Note: the rate at which heat is being lost is given by U x AT, W/m2, where U is the overall coefficient and AT the temperature difference; see Chapter 12.

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A textbook of inorganic chemistry vol.VII part II Sulphur, Selenium, and Tellurium by Douglas F. Twiss, & Annie R. Russell Reece H. Vallance


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