US 12,358,399 B2
Monitoring health of heat transfer fluids for electric systems
Gary Christensen, Wenonah, NJ (US); Kevin J. Kelly, Mullica Hill, NJ (US); Shuji Luo, Basking Ridge, NJ (US); and Andrew E. Taggi, Frenchtown, NJ (US)
Assigned to EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY, Annandale, NJ (US)
Appl. No. 17/906,955
Filed by EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY, Annandale, NJ (US)
PCT Filed Mar. 17, 2021, PCT No. PCT/US2021/022671
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2021/194813, PCT Pub. Date Sep. 30, 2021.
Claims priority of provisional application 63/001,032, filed on Mar. 27, 2020.
Prior Publication US 2023/0166635 A1, Jun. 1, 2023
Int. Cl. H01M 10/61 (2014.01); B60L 3/12 (2006.01); B60L 58/26 (2019.01); H01M 10/625 (2014.01); H01M 10/6567 (2014.01); H01M 10/66 (2014.01); C09K 5/10 (2006.01)
CPC B60L 58/26 (2019.02) [B60L 3/12 (2013.01); H01M 10/61 (2015.04); H01M 10/625 (2015.04); H01M 10/6567 (2015.04); H01M 10/66 (2015.04); B60L 2240/425 (2013.01); B60L 2240/525 (2013.01); B60L 2240/545 (2013.01); C09K 5/10 (2013.01); H01M 2220/20 (2013.01)] 17 Claims
 
1. A method of operating a heat transfer system includes circulating a non-aqueous, dielectric heat transfer fluid through a heat transfer circuit in fluid communication with an electric system, the heat transfer circuit including a pump, a conduit, and a heat exchanger, obtaining real-time measurements of fluid properties of the heat transfer fluid within the heat transfer circuit, the fluid properties being selected from the group consisting of density (ρ), specific heat (cp), dynamic viscosity (μ), and thermal conductivity (k), calculating a dimensional effectiveness factor for the heat transfer fluid (DEFfluid) based on the real-time fluid properties and for a selected pump and a selected dominant flow regime within the heat transfer circuit, calculating a dimensional effectiveness factor for a reference fluid (DEFreference) and for the selected pump and the selected dominant flow regime within the heat transfer circuit, determining a normalized effectiveness factor (NEFfluid) of the heat transfer fluid from the following equation:

OG Complex Work Unit Math
determining a health of the heat transfer fluid based on the NEFfluid, wherein if the NEFfluid is below a predetermined threshold, the health will be considered deteriorated, and wherein if the NEFfluid is above the predetermined threshold, the health will be considered viable.