Xiaomi Introduces Loop LiquidCool Tech, Promises to Double the Cooling Efficiency of Vapor Chambers
Global technology leader Xiaomi unveiled its latest
breakthrough in heat dissipation – Loop LiquidCool Technology. Inspired by
cooling solutions used in the aerospace industry, Loop LiquidCool Technology
utilizes a capillary effect which draws liquid cooling agent to the heat
source, vaporizes, and then disperses the heat efficiently towards a cooler
area, until the agent condenses and is captured via a unidirectional closed
looped channel.
Compared to conventional vapor chambers solutions, this new
technology has twice the cooling capabilities and ranks as the most efficient
smartphone cooling solution. Xiaomi aims to bring Loop LiquidCool Technology to
its products in H2 2022.
Loop LiquidCool Technology
This new technology features an annular heat pipe system
that is composed of an evaporator, a condenser, a refill chamber, as well as
gas and liquid pipes. Placed at heat sources, the evaporator has refrigerant
that evaporates to gas when the smartphone is under high workload.
The gas and airflow is then diffused to the condenser, where
the gas condenses into liquid again. These liquids are absorbed and collected
through tiny fibers in the refill chamber—which refills the evaporator—making
it a self-sustaining system.
Although this new technology uses the same method as VC
liquid cooling, the new form factor makes a significant efficiency difference.
As conventional VC systems do not have separate channels for gases and liquids,
hot gas and cool liquids mix and obstruct each other while, especially under
high workload. The ring-shaped pump features a special gas pipe design, which
greatly reduces air passage resistance by 30%. By allowing for a smoother steam
flow, the maximum heat transfer capacity is increased by up to 100%.
One-way circulation is key to heat dissipation
To ensure one-way high-efficiency circulation, implementing
a Tesla valve structure within the refill chamber is crucial. A Tesla valve is
a one-way valve that allow liquid to pass through the evaporator, while
blocking gases from moving in the incorrect direction. This allows for a higher
efficiency in gas/liquid circulation throughout the system.
On a custom Xiaomi MIX 4, the original vapor chamber was
replaced with a new Loop LiquidCool Technology solution. During a 30-minute
Genshin Impact gameplay test running 60fps max video settings, this impressive
cooling system kept the device below a max temperature of 47.7℃
and the processor was 8.6℃ lower than the standard version.
Thanks to the one-way circulation, gas-liquid separation,
and low heat-resistance gas pipes of the Tesla valve, the flexible form factor
also makes it possible to adopt and stack Loop LiquidCool Technology into any
type of internal design. For example, a square-shaped loop will allow more
space for the battery, camera module, and more.
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