Description
Shift a stream enthalpy reference using constant heat capacity.
Heat-flow and specific-enthalpy terms depend on a sign convention, a reference state and compatible mass/time bases. A temperature shift, heat-duty residual or latent-energy ratio evaluates a supplied model without determining heat-transfer feasibility, actual properties or equipment performance.
Shift a stream enthalpy reference using constant heat capacity.
When to use this tool
Use Process Stream Enthalpy Reference Shift when checking the stated thermal, reference-state or energy-balance convention.
How to use the tool and how it works
- Enter enthalpy, oldReferenceTemperature, newReferenceTemperature, heatCapacity, massFlow. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read shiftedSpecificEnthalpy, enthalpyFlow. Use the output convention below.
Shift a stream enthalpy reference using constant heat capacity. Require heatCapacity/massFlow >= 0; shiftedSpecificEnthalpy = enthalpy+cp*(oldReference-newReference), enthalpyFlow = massFlow*shifted enthalpy.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| enthalpy | Enthalpy | Required. Finite number. |
| oldReferenceTemperature | Old Reference Temperature | Required. Finite number. |
| newReferenceTemperature | New Reference Temperature | Required. Finite number. |
| heatCapacity | Specific heat per matching mass and temperature unit; used as constant over the reference shift. | Required. Finite number; minimum 0. |
| massFlow | Mass Flow | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| shiftedSpecificEnthalpy | Shifted Specific Enthalpy | Required. Finite number. |
| enthalpyFlow | Enthalpy Flow | Required. Finite number. |
{
"input": {
"enthalpy": 100,
"oldReferenceTemperature": 20,
"newReferenceTemperature": 30,
"heatCapacity": 2,
"massFlow": 5
},
"output": {
"shiftedSpecificEnthalpy": 80,
"enthalpyFlow": 400
}
}Limitations and assumptions
- Heat capacity is mass-specific and references share a temperature scale; no material property lookup, phase change or nonlinear integration occurs.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified state-dependent properties and the complete heat/work balance; evaluate heat transfer and equipment constraints separately for engineering decisions.
References
Similar or alternative tools
- Heat Exchanger One Stream Capacity Rate
Return one stream's heat-capacity rate and sensible heat rate.
- Chemical Engineering: Pinch Hot Cold Shifted Temperature
Shift a temperature for pinch-analysis comparison.