Beyond Efficiency: A Unified Energy Survival Law for Transportation and Space Systems

Abstract

Classical energy efficiency metrics systematically overestimate real-world performance because they model energy conversion as a single-stage process and implicitly neglect irreversible thermodynamic degradation. Across biological metabolism, electric transportation, information systems, and spaceflight, observed system-level outputs consistently fall far below what component-level efficiencies would predict. These discrepancies are most evident in advanced electric vehicles and reusable launch systems, where increases in battery capacity, power, or thrust do not yield proportional gains in driving range or payload mass.

This paper introduces a Unified Energy Survival–Conversion Law that reformulates useful output as a survival-limited, multi-stage process governed by irreversible thermodynamics and finite conversion capacity. An energy survival factor (Ψ) is defined to quantify the fraction of absorbed energy that persists against transport losses and entropy generation. When coupled with an internal conversion competency term (C_int), the framework yields a universal performance relation:

The law is validated against empirical data from biological ecosystems, electric vehicles, and reusable launch systems. Case studies involving Tesla and SpaceX demonstrate that performance saturation arises from survival degradation and bounded conversion capacity rather than inefficient motors or engines. The framework is thermodynamically consistent, experimentally falsifiable, and independent of energy source or system scale, offering a unified physical basis for diagnosing performance limits and guiding system-level optimization.