Multi-Stream Heat Exchanger — DWSIM Unit Operation¶
Multi-Stream Heat Exchanger (MSHX) is an external unit operation for DWSIM that simulates heat exchange among up to six simultaneous process streams using the segmented interval method with composite curve analysis.
Key Features¶
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Rigorous Theory
Segmented interval method with composite curve analysis, rigorous enthalpy-based H-T curves via pressure-enthalpy flashes, and zone-by-zone UA calculation supporting phase change.
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Three Calculation Modes
Outlet Temperatures: specify exit T. MITA: specify minimum internal temperature approach. UA: specify overall heat transfer coefficient-area product.
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Validated Results
11 test cases validated against the e-NTU analytical method and energy balance checks with average errors below 2% on temperatures and heat duties.
Calculation Workflow¶
Capabilities¶
| Feature | Description |
|---|---|
| Streams | Up to 6 simultaneous streams (any combination of hot and cold) |
| Calculation Modes | Outlet Temperatures, MITA, and UA (direct or U×A) |
| Flow Direction | Counterflow and co-current (parallel flow) |
| Phase Change | Rigorous enthalpy-based H-T curves handle vaporization/condensation |
| Composite Curves | Built-in composite curve chart with individual stream curves |
| Pressure Drop | Specified pressure drop per stream |
| Heat Leak | Optional heat leak/gain to surroundings |
| Solver | Q-bisection with PH flash for 2-stream; proportional capacity distribution for N-stream |
| Automation API | Full headless control via DWSIM Automation |
| Units | Automatic conversion to/from DWSIM unit system |