Automotive Engineering - March 2023 - 27

THERMAL MANAGEMENT FEATURE
Coolant-valve performance
criteria such as minimal
internal leakage are
pivotal to overall thermalmanagement
system
performance in EVs. Shown
here is a three-port valve
by Robertshaw Controls.
maximum flow efficiency. They are designed and manufactured
to limit internal leakage - impossible to eliminate completely
- to well less than 10cc.
Additionally, these valves are designed to maintain low fluid
pressure at the inlet point and in line with overall system pressure.
Optimal fluid pressure aids TMS performance in a couple of ways.
Minimizing fluid pressure flowing through a valve reduces
the energy demand on fluid pumps. In addition to the energy
savings, it might be possible for the TMS designer to reduce
pump size and realize space and cost savings.
Also, minimizing fluid pressure prevents steep, abrupt coolant
Delta-Ps (pressure drops) - the enemy of high performance
in critical EV systems because they mitigate a necessarily
steady coolant flow. Preventing abrupt pressure drops
makes it easier to maintain desired temperatures in an often
narrow range in and around these systems. Tight control of
coolant pressure in a typically intricate TMS design is critical;
even small decreases in flow rates from precipitous coolant
pressure drops can produce increases in cooling air temperatures
outside of specified ranges. This adversely impacts system
and vehicle performance.
Other key considerations
OEMs should also prioritize several other coolant-valve properties
to make their TMS designs flexible, space-efficient and
operationally reliable:
* A modular electrical connection platform to accommodate
different pin shapes and standards
AUTOMOTIVE ENGINEERING
March 2023 27
* Coolant hose connection modularity: VDA, quick connector,
hose barb, etc.
* Space and weight optimization
* Voltage compatibility: 12V, 24V and 48V
* Durability: At least 100,000 cycles in 10 years
Coolant valves are critical components within a thermalmanagement
system that keep vital electric-vehicle systems
operating at peak efficiency. Robertshaw advises OEMs to
take valve performance properties into account in TMS design.
Overall EV performance depends on it.
Steven Hokky is CTO for Robertshaw Controls, a global design,
engineering and manufacturing company that supplies parts and
subassemblies to electric vehicle OEMs.
ROBERTSHAW CONTROLS CO.

http://info.hotims.com/84492-709

Automotive Engineering - March 2023

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