Predictability of exergy destruction in helically coiled tube heat exchangers: global, pitch-specific and hierarchical correlations

Hessam Mirgolbabaei

doi:10.1108/hff-05-2026-0614

August 18, 2026International Journal of Numerical Methods for Heat &amp Fluid FlowOpen Access

Predictability of exergy destruction in helically coiled tube heat exchangers: global, pitch-specific and hierarchical correlations

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Key Points

To evaluate second-law thermodynamic performance and establish predictive correlations for dimensionless exergy-destruction fraction across varying operating conditions and coil pitches in helically coiled tube heat exchangers.
Generated a dataset using over 2,400 steady-state, laminar, fluid-to-fluid computational fluid dynamics (CFD) simulations of water-to-water heat exchange.
Calculated inlet and outlet exergy rates across control volumes to determine exergy destruction rates and fractions.
Trained and evaluated global, pitch-specific, and machine learning surrogate regression models using log-space transformations and five-fold cross-validation.
A standard global power-law model exhibited statistically significant parameter dependence but poor cross-validated predictive performance (Dh-based: RCV,log² = 0.1687, RMSECV,log = 0.1402).
Gaussian process regression with automatic relevance determination (LogLog–GPR–ARDSE) achieved the best global accuracy (Dh-based: RCV,log² = 0.7171, RMSECV,log = 0.08181).
Pitch-specific modeling showed that optimal surrogate architectures vary with coil geometry, with GPR–ARDSE performing best at pitches of 1.80, 1.85, and 2.00, and bagged trees performing best at pitches of 1.90 and 1.95.

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Implication

Computational fluid dynamics modeling demonstrates advanced surrogate models accurately predict exergy destruction in helically coiled heat exchangers, suggesting improved design optimization.

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Hessam Mirgolbabaei (2026) studied this question.

synapsesocial.com/papers/6a86b4cb8a91293e6a1cc4c5 https://doi.org/10.1108/hff-05-2026-0614

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Predictability of exergy destruction in helically coiled tube heat exchangers: global, pitch-specific and hierarchical correlations

Key Points

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Discussion

Cite This Study

Predictability of exergy destruction in helically coiled tube heat exchangers: global, pitch-specific and hierarchical correlations

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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