Expert-level chemical process design covering process flow diagrams, mass and energy balances, equipment sizing, economic evaluation, and sustainable process design.
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BFD: block flow diagram, overall process blocks and streams. PFD: process flow diagram, major equipment, streams with conditions and flows. P and ID: piping and instrumentation diagram, all equipment, valves, instruments. Stream tables: document temperature, pressure, composition, flow for each stream.
Overall balance: total mass in equals total mass out for steady state. Component balance: each species balanced separately. Recycle streams: iterative solution required, tear stream method. Energy balance: enthalpy difference between inlet and outlet streams. Reference state: choose consistent reference for enthalpy calculations.
Heat exchangers: LMTD and U value determine area, tube and shell sizing. Pumps: head and flow from system curve, pump curve intersection. Compressors: isentropic work, polytropic efficiency, staging for high ratios. Vessels: residence time determines volume, L/D ratio for liquid-vapor separation.
Capital cost: purchased equipment cost, installation factor, total fixed capital. Operating cost: raw materials, utilities, labor, maintenance, overhead. NPV: net present value, discounted cash flows over project life. Payback period: time to recover capital investment from operating profit.
| Pitfall | Fix |
|---|---|
| Wrong basis for calculations | Define basis clearly, usually per hour or per year |
| Ignoring recycle convergence | Check that recycle streams are converged before proceeding |
| Underestimating installation costs | Use appropriate Lang or Hand factor for total capital |
| Missing utility costs | Include steam, cooling water, electricity in operating cost |
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Expert-level abstract algebra knowledge. Use when working with groups, rings, fields, modules, Galois theory, representation theory, or algebraic structures. Also use when the user mentions 'group', 'ring', 'field', 'homomorphism', 'isomorphism', 'normal subgroup', 'quotient group', 'Sylow theorem', 'Galois theory', 'polynomial ring', 'ideal', 'module', 'vector space', or 'representation theory'.
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Expert-level acoustics knowledge. Use when working with sound waves, acoustic propagation, resonance, standing waves, Doppler effect, room acoustics, ultrasound, noise control, musical acoustics, or architectural acoustics. Also use when the user mentions 'sound wave', 'decibel', 'frequency', 'resonance', 'standing wave', 'Doppler effect', 'acoustic impedance', 'reverberation', 'ultrasound', 'noise control', 'harmonics', or 'sound intensity'.
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Expert-level aerodynamics covering subsonic and supersonic flow, lift and drag, airfoil theory, boundary layers, compressible flow, and CFD methods.
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Expert-level air quality engineering covering pollutant sources, atmospheric dispersion, air quality standards, emission controls, and air quality modeling.
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Expert-level aircraft structures covering structural design philosophy, wing and fuselage analysis, fatigue and damage tolerance, composite structures, and certification.
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Expert-level algorithms and complexity theory covering sorting, searching, graph algorithms, dynamic programming, greedy algorithms, NP-completeness, and algorithm design paradigms.
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