Passive Thermal Management for Compact Mechanical Systems

Elisabeth Mayer

Passive Thermal Management for Compact Mechanical Systems

Author(s)	Prof. Elisabeth Mayer
Country	United States
Abstract	Compact mechanical and mechatronic systems increasingly combine motors, bearings, power electronics, sensors, actuators, batteries, control modules, and structural components within restricted packaging volumes. The resulting concentration of heat can generate local hot spots, lubricant degradation, thermal distortion, accelerated material aging, and reduced reliability. Active cooling can provide high heat-removal capacity, but fans and pumps add power consumption, acoustic noise, moving parts, maintenance requirements, packaging complexity, and additional failure modes. Passive thermal management therefore remains attractive where heat can be redistributed, stored temporarily, and rejected without continuous auxiliary power. This study develops a methodological framework for selecting and integrating passive thermal technologies for compact mechanical systems. Because authenticated prototype temperatures, heat-flux measurements, computational-fluid-dynamics results, and thermal-cycle records were not supplied, the quantitative component is explicitly simulation based. Three architectures are evaluated: a conductive metallic heat spreader with natural-convection heat rejection, a vapor-chamber-assisted spreader, and a hybrid vapor-chamber plus phase-change-material system for intermittent thermal loads. A Passive Thermal Management Integration Index is developed from spreading resistance, heat-transport capability, transient buffering capacity, temperature uniformity, packaging efficiency, orientation robustness, and reliability. Simulated analysis indicates that passive architecture selection becomes increasingly important as heat density rises. At an intermittent 50 W heat load, modeled peak temperature decreases from 105 °C for the conventional conductive system to 87 °C using a vapor chamber and to 72 °C using a vapor-chamber/phase-change-material hybrid. The study emphasizes that phase-change materials should be treated primarily as transient energy buffers rather than continuous heat sinks, while vapor chambers and heat pipes are most effective when an adequate downstream heat-rejection path exists. The proposed framework supports passive thermal design as a system-level optimization problem involving conduction, spreading, storage, natural convection, component arrangement, mass, volume, and reliability.
Keywords	: passive thermal management, compact mechanical systems, heat pipes, vapor chambers, phase-change materials, heat spreading, natural convection, thermal reliability
Field	Engineering
Published In	Volume 7, Issue 4, July-August 2026
Published On	2026-07-23

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American Journal of Advanced Multidisciplinary Innovation and Research

A Widely Indexed Open Access Peer Reviewed Multidisciplinary Bi-monthly Scholarly International Journal

Passive Thermal Management for Compact Mechanical Systems

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