Chemical and Energy Process Engineering by Sigurd Skogestad

By Sigurd Skogestad

Notation, strategies and numbersNotationAlways cost the units!Some conversion factorsSome very important numbersSome very important conceptsUnit operationsBatch and non-stop processA little approximately economySome enjoyable and necessary strength exercisesGlobal strength consumptionDerivation of stability equationsThe stability principleThe stability equationMass balances with out accumulationRecycleSystematic formula and resolution of mass Read more...

summary: Notation, strategies and numbersNotationAlways fee the units!Some conversion factorsSome very important numbersSome very important conceptsUnit operationsBatch and non-stop processA little approximately economySome enjoyable and worthy strength exercisesGlobal strength consumptionDerivation of stability equationsThe stability principleThe stability equationMass balances with no accumulationRecycleSystematic formula and answer of mass balancesUse of spreadsheet programExamples of recycle with out reactionFlash calculationsSummary: strategy for deriving stability equationsDegrees of freedom and solvabilitySimulation as opposed to

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2 (page 30). 3 29 Batch versus continuous Advantages with continuous operation. Continuous production usually has a substantially better energy efficiency than batch production, because one can use heat integration where an energy demand in one part of the process is matched by an energy excess in another part. It is also easier to automate a continuous process such that it needs fewer operators. In short, the operation costs are lower than with batch production. In addition, there are some processes that are less suitable for batch production.

32 ∗ Hanne was wearing a pulse monitor, and when we got back, it estimated that she had used 7000 calories during the hike. How much water does this correspond to if all of the cooling was due to sweating? 10 37 Global energy consumption We end this chapter by looking into the world’s future. A high standard of living is closely related to the use of energy. 1 shows the global energy consumption by source for the period 2000 to 2050, as predicted in 2008 by the Shell oil company. Energy use is predicted to double in the period 2000 to 2050.

013250 bar (where 1 bar is 105 N/m2 = 105 P a). In most cases, the composition of (dry) 6 air can be set to 21 mol% O2 and 79% N2 . 7 In addition, air contains a varying amount of water. 6mol% at 0 o C, approx. 3% at 25 o C and 100% at 100 o C (because the vapor9 pressure of water is ca. 03 atm and 1 atm at the three temperatures). 97 g/mol (or approximately 29 g/mol). 4. 15 Water. 015 g/mol. 5 (page 359) for details. Water vapor is also known as steam. 6 By dry basis we mean that any water in the gas has been removed before calculating the composition.

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