heat-exchanger-design

# Heat Exchanger Design Skill ## Purpose The Heat Exchanger Design skill provides comprehensive capabilities for sizing, rating, and optimizing heat exchangers according to TEMA standards, enabling systematic thermal-hydraulic design of shell-and-tube, plate, and air-cooled heat exchanger configurations. ## Capabilities - Shell-and-tube heat exchanger design and rating - Plate heat exchanger sizing - Air-cooled heat exchanger configuration - LMTD and effectiveness-NTU methods - Fouling factor consideration - Pressure drop calculations - HTRI Xchanger Suite integration - Thermal-hydraulic optimization ## Usage Guidelines ### Design Methods #### LMTD Method 1. **Log Mean Temperature Difference** ``` LMTD = (ΔT1 - ΔT2) / ln(ΔT1/ΔT2) Q = U × A × F × LMTD Where: F = Correction factor for non-counterflow U = Overall heat transfer coefficient A = Heat transfer area ``` 2. **LMTD Correction Factors** - One shell pass, 2/4/6 tube passes - Two shell passes, 4/8 tube passes - Crossflow configurations #### Effectiveness-NTU Method 1. **Effectiveness Definition** ``` ε = Q_actual / Q_max Q_max = Cmin × (Th,in - Tc,in) ``` 2. **NTU Calculation** ``` NTU = UA / Cmin Cr = Cmin / Cmax ``` 3. **Effectiveness Relations** - Counterflow: ε = (1-exp(-NTU(1-Cr)))/(1-Cr×exp(-NTU(1-Cr))) - Parallel flow: ε = (1-exp(-NTU(1+Cr)))/(1+Cr) - Shell-and-tube: Complex correlations by TEMA type ### Shell-and-Tube Design 1. **TE...