Thermal Management


Cooling the right things, not everything


The shift in thinking that contemporary thermal architecture demands is straightforward to state, though challenging: stop trying to solve the entire thermal envelope with one airflow path and start designing airflow to match the actual heat density map of the system.


Modern SoCs, high-speed memory, discrete graphics tiles, voltage regulators, and NVMe storage each have distinct thermal profiles, distinct locations on the board, and distinct sensitivity to elevated temperatures. A monolithic airflow strategy treats all of them identically, directing whatever air happens to pass by in their general direction and hoping the result lands within thermal limits. A targeted approach assigns dedicated airflow to each thermal zone based on where the heat actually is and how much cooling that specific load requires.


Figure 4 illustrates a zoned cooling design that divides the system into distinct thermal regions with independent airflow paths rather than a single shared channel. This means separating the airflow responsible for cooling the primary processor heat exchanger from the airflow responsible for managing keyboard, palm rest, and bottom-cover skin temperatures. These are fundamentally different thermal objectives and coupling them into a single flow path means compromising both.


When heat exchanger cooling and skin temperature management share the same air mover, the system designer faces an uncomfortable trade off: optimizing for junction temperature risks skin temperatures


An axial fan’s performance scales with impeller diameter. As chassis get thinner and smaller, the diameter available to a fan shrinks, and its ability to generate flow falls disproportionately. Covering the loss requires spinning faster, which increases noise. Ionic cooling performance, by contrast, scales with the active length of the device rather than a rotational geometry, and that relationship is considerably more linear. The smaller the form factor, the more the physics favour a solid- state approach over a mechanical one.


Figure 3. Notebook cooling using EHD devices in the Ionic Cooling Zone allows system architects to design functionality within discrete, specialized zones.


that feel unacceptably warm to the user; optimizing for comfort risks thermal throttling. Decoupling the two paths eliminates that trade off entirely. Each path can be tuned independently (e.g., flow rate, impedance, inlet geometry) without affecting the other.


What zoned cooling means for system design


Beyond the thermal performance improvements, a zoned cooling architecture changes the practical experience of designing and manufacturing a notebook platform in meaningful ways.


The first is layout freedom. Without fan cutouts, the mainboard becomes a large, rectangular zone that can be treated as a modular compute platform, reusable across multiple SKUs with minimal changes to the board itself. Standardized cooling modules at the rear of the chassis can be scaled or swapped without forcing a board redesign.


This modularity shortens validation cycles, reduces unique part counts, and simplifies supply chain management. Figure 5 illustrates how reclaimed board space can be used to support additional memory modules which are essential for improving local AI inference performance.


A more intentional thermal architecture


The broader lesson from the evolution toward zoned cooling is less about any specific technology and more about a design philosophy: thermal architecture should be a first-class consideration in system layout, not an afterthought that fills in around the edges of a board that was designed for other priorities.


Cooling everything uniformly and hoping


Figure 5. When fan cutouts are removed, a tremendous amount of space is freed up. This reclaimed area can be used to increase memory capacity, as shown above, or battery capacity.


The second is battery volume. Without fan cavities competing for interior space, more of the chassis volume can be allocated to battery cells. For AI-capable notebooks where average sustained power is rising, this matters: a larger battery in the same industrial design directly extends the use cases the device can support on a single charge.


The third is the user experience. Silent operation is not merely a feature preference. It changes the context in which a device can be used and the perception of quality it conveys. A system that produces no acoustic output under full AI inference load performs better in meeting rooms, libraries, and open offices than any fan-based design can, regardless of how carefully that fan is tuned.


The physics argument for targeted cooling


Figure 4. Ionic cooling devices can operate in parallel to create independent airflow paths. In this example, two devices cool the SoC (light blue arrows) and one device cools peripheral devices and system skins (light green arrows).


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There is a deeper reason why the industry should expect this architectural shift to continue: the physics of traditional fan-based cooling become less favourable as form factors shrink.


the hottest components stay within spec is the thermal equivalent of designing for the average case. Modern electronics increasingly live at the extremes of their thermal envelopes, driven by workloads that are more demanding, more variable, and more localized than a uniform airflow model can address well.


A purposeful approach that assigns airflow based on where heat is generated, in what quantity, and at what sensitivity, gives system designers the freedom to put compute and memory placement first, and apply cooling precisely where it is needed. That freedom translates directly into better thermal performance, richer feature sets, simpler layouts, and ultimately better products. The question for designers evaluating their next platform architecture is not whether targeted, zoned cooling is the right direction. The question is how quickly the tools and building blocks available to them will make it the default.


https://ventiva.com/ Components in Electronics June 2026 27


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