Technology – Thermal Architecture and Operating Principle
Active heat plate performance is defined by conductivity distribution and in-plane homogenization, not by thickness alone. This page formalizes the serial resistance model, anisotropic conductivity, and the system-level logic behind multilayer architectures.
Core Thesis
In actively heated systems, surface temperature homogeneity is governed by lateral heat redistribution. Thickness increases mass and thermal inertia, but does not change conductivity distribution. The governing parameters are effective in-plane conductivity k_xy,eff and derived diffusivity α_xy.
Serial Thermal Resistance – Vertical Direction
For vertical heat flow across multilayer stacks, the serial resistance model applies:
R_total = (t1 / λ1) + (t2 / λ2) + (t3 / λ3)
The corresponding effective vertical conductivity is:
λ_eff = t_total / R_total
This model is correct for one-dimensional conduction through thickness direction. It does not describe lateral homogenization in the plane.
Directional Conductivity – Anisotropic View
Multilayer thermal architecture is directional. A simplified representation uses an anisotropic conductivity tensor:
K = diag(k_xy, k_xy, k_z)
Effective vertical conductivity
k_z,eff = L_total / Σ(L_i / k_i)
Effective in-plane conductivity
k_xy,eff ≈ Σ(k_i · L_i) / L_total
Transient System Dynamics
Lateral homogenization is a transient phenomenon. The system-relevant relation is:
∂T/∂t = α_xy ∇²T
α_xy = k_xy,eff / (ρ_eff · c_p,eff)
Higher k_xy,eff increases α_xy and reduces homogenization time.
Architecture Comparison – Direct Reference Values
The following values are used as reference scaling points in the technical framework:
Class I: Monolithic stainless steel → k ≈ 15 W/m·K
Class II: Dual layer stainless + structural steel → k_xy,eff ≈ 45 W/m·K
Class III: Aluminum core architecture (RevoCORE®) → k_xy,eff ≈ 174 W/m·K
Development path: Copper core architecture (RevoDUR®) → k_xy,eff ≈ 292 W/m·K
RevoCORE® is serial-ready. RevoDUR® is under development and not qualified for serial production as of March 2026.
Model Limits and Assumptions
The relations above represent first-order scaling. They assume ideal metallurgical bonding, negligible interface contact resistance, and constant material properties. Real systems additionally depend on boundary losses, heat input distribution and control behavior.
Frequently Asked Technical Questions
Is the serial resistance model sufficient
No. It describes vertical one-dimensional conduction only. Active plates are dominated by lateral redistribution.
What is the difference between k_z,eff and k_xy,eff
k_z,eff describes effective conductivity through thickness. k_xy,eff describes in-plane heat spreading and governs homogenization speed.
What is the status of RevoDUR®
RevoDUR® is a copper-core development path. As of March 2026 it is under development and not qualified for serial production.