ASHRAE Journal - February 2024 - 62
TECHNICAL FEATURE
decrease, and PG-25 had a 1.62% decrease in the pH
value. EG-55 had an increase in pH, and PG-25 had the
least decrease of 0.77%. The conductivity of EG-55 and
PG-55 increased, and EG-25 had a 4.5% increase when
parts were present. PG-25 had the highest decrease in
ORP when wetted materials were absent, and EG-25 had
the highest decrease in ORP value in the other plot.
Future Work
The procedure was performed at elevated
temperatures to accelerate material performance
degradation. Multiple cold plates will undergo long
test runs (up to 90 days) to observe changes in fluid
chemistry and cold plate performance. Scanning
electron microscopy will identify foreign materials on
the microchannel surfaces, and Fourier transforminfrared
spectroscopy will detect copper or corroded
substrate presence. Propylene glycols are preferred
over ethylene glycols due to their antibacterial growth
property, and the initial and concluding bacterial
growth for each liquid will be compared by direct and
indirect methods like turbidimetry.
References
1. Intel. Undated. " Intel® Xeon® Platinum 9282 Processor. " Intel.
2. NVIDIA. 2021. " NVIDIA A100 Tensor Core GPU. " NVIDIA.
3. Day, T., P. Lin, R. Bunger. 2019, " Liquid Cooling Technologies
for Data Centers and Edge Applications. " Schneider Electric-Data
Center Science Center, White Paper No. 265.
4. ASHRAE. 2013. Liquid Cooling Guidelines for Datacom Equipment
Centers, Second Ed. Peachtree Corners, GA: ASHRAE.
5. Mohapatra, S. 2006. " An overview of liquid coolants for
electronics cooling. " Electronics Cooling (2).
6. Aittomäki, A., A. Lahti. 1997. " Potassium formate as a secondary
refrigerant. " International Journal of Refrigeration 20(4):276-282.
7. Chrysler, G.M., R.C. Chu, R.E. Simons. 1994. " Jet impingement
boiling of a dielectric coolant in narrow gaps. " Proceedings of 1994 4th
Intersociety Conference on Thermal Phenomena in Electronic Systems 1 - 8.
8. Kini, G., et al. 2020. " Corrosion in liquid cooling systems with
water-based coolant-part 1: flow loop design for reliability tests. "
2020 19th IEEE Intersociety Conference on Thermal and Thermomechanical
Phenomena in Electronic Systems (ITherm) 422-428.
9. Kim, C.U., et al. 2020. " Corrosion in liquid cooling systems
with water-based coolant-part 2: corrosion reliability testing and
failure model. " 2020 19th IEEE Intersociety Conference on Thermal and
Thermomechanical Phenomena in Electronic Systems (ITherm) 429-434
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Table of Contents for the Digital Edition of ASHRAE Journal - February 2024
ASHRAE Journal - February 2024 - Intro
ASHRAE Journal - February 2024 - CT1
ASHRAE Journal - February 2024 - CT2
ASHRAE Journal - February 2024 - Cover1
ASHRAE Journal - February 2024 - Cover2
ASHRAE Journal - February 2024 - 1
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ASHRAE Journal - February 2024 - Cover3
ASHRAE Journal - February 2024 - Cover4
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