Parameters Reference¶

Input Parameters¶

Configuration¶

Parameter	Property Name	Type	Default	Description
Calculation Mode	`Calculation Mode`	Enum	Outlet Temperatures	`OutletTemperatures`, `MITA`, or `UA`
Flow Direction	`Flow Direction`	Enum	Counterflow	`Counterflow` or `CoCurrent`
Number of Segments	`Number of Segments`	Integer	25	Resolution of H-T curves and composite curves
UA Input Mode	`UA Input Mode`	Enum	UA	`UA` (direct) or `UxA` (separate U and A)

Specifications¶

Parameter	Property Name	Unit	Default	Description
MITA Specified	`MITA`	K	5.0	Target minimum internal temperature approach (MITA mode)
UA Specified	`UA`	W/K	1000	Target UA product (UA mode, direct)
U Specified	`U (Overall HTC)`	W/(m²·K)	500	Overall heat transfer coefficient (UA mode, U×A)
A Specified	`A (Area)`	m²	2.0	Heat transfer area (UA mode, U×A)
Heat Leak	`Heat Leak`	W	0	Heat gain/loss to surroundings

Per-Stream Specifications¶

Parameter	Property Name	Unit	Description
Outlet Temperature 1–6	`Outlet Temperature 1`...`6`	K	Specified outlet temperature (0 = auto)
Pressure Drop 1–6	`Pressure Drop 1`...`6`	Pa	Pressure drop applied to each stream

Output Parameters¶

Global Results¶

Parameter	Property Name	Unit	Description
Total Heat Transferred	`Heat Duty`	W	Total heat exchanged between streams
MITA Calculated	`MITA (Calculated)`	K	Actual minimum internal temperature approach
UA Calculated	`UA (Calculated)`	W/K	Actual overall heat transfer coefficient-area product
Effective LMTD	`LMTD`	K	Effective log-mean temperature difference
Thermal Efficiency	`Thermal Efficiency`	—	Fraction of maximum possible heat transfer

Per-Stream Results (Displayed in Editor)¶

Result	Description
Temperature	Inlet → Outlet temperature for each stream
ΔT	Temperature change across the exchanger
Heat Duty (Q)	Individual stream heat duty (kW)
ΔP	Applied pressure drop
Avg Cp	Average specific heat capacity (kJ/kg·K)

Property Interface¶

All parameters are accessible through the DWSIM property interface for automation:

Read PropertiesWrite PropertiesGet Units

# Get a property value (returns in SI units)
value = mshx.GetPropertyValue("Heat Duty")        # W
value = mshx.GetPropertyValue("MITA (Calculated)")  # K
value = mshx.GetPropertyValue("UA (Calculated)")     # W/K

# Set a property value (expects SI units)
mshx.SetPropertyValue("MITA", 10.0)             # K
mshx.SetPropertyValue("UA", 2000.0)              # W/K
mshx.SetPropertyValue("Pressure Drop 1", 5000)   # Pa
mshx.SetPropertyValue("Outlet Temperature 1", 350)  # K

# Get the SI unit string for a property
unit = mshx.GetPropertyUnit("Heat Duty")   # "W"
unit = mshx.GetPropertyUnit("MITA")        # "K"
unit = mshx.GetPropertyUnit("UA")          # "W/K"

Unit Conversion

All property values are stored and returned in SI units. The DWSIM editor handles conversion to the user's selected unit system automatically. When using the automation API, always provide values in SI.