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公开(公告)号：US11092393B1
公开(公告)日：2021-08-17
申请号：US16892897
申请日：2020-06-04
Applicant: ExxonMobil Research and Engineering Company
Inventor： Gary Christensen , Kevin J. Kelly , Shuji Luo , Heinrich R. Braun , Tobias Klande , Behrouz Engheta , Jorg F. W. Weber , Andrew E. Taggi
Abstract: This disclosure relates to heat transfer fluids for use in heat transfer systems. The heat transfer fluids comprise at least one non-aqueous dielectric heat transfer fluid. The non-aqueous dielectric heat transfer fluid has density (ρ), specific heat (cp), and dynamic viscosity (μ) properties. The heat transfer fluids have a normalized effectiveness factor (NEFfluid) as determined by the following equation: N E F fluid = D E F fluid D E F reference ; wherein DEFfluid is a dimensional effectiveness factor for the heat transfer fluid that is determined based on an equation designated in Table 1 below for a selected pump and a selected heat transfer circuit dominant flow regime; wherein DEFreference is a dimensional effectiveness factor for a reference fluid that is determined using the same equation designated in Table 1 for DEFfluid above for the same selected pump and the same selected heat transfer circuit dominant flow regime; and TABLE 1 (Heat Transfer Fluid and Reference Fluid) Selected Heat Transfer Circuit Flow Regime Selected Pump
Laminar
Transition (Blasius) Positive Displacement Pump
ρ1 cp1 μ−1
ρ0.25 cp1 μ−0.25 Centrifugal Pump
ρ0.19 cp1 μ−0.19
ρ0.04 cp1 μ−0.04 wherein the heat transfer fluid has a NEFfluid value equal to or greater than 1.0. This disclosure also provides a method for improving performance of a heat transfer system, a method for improving performance of an apparatus, and a method for selecting a heat transfer fluid for use in a heat transfer system. The heat transfer fluids and methods of this disclosure are applicable in situations where the heat transfer system is dominated by heat conveyance.-
公开(公告)号：US10712105B1
公开(公告)日：2020-07-14
申请号：US16447398
申请日：2019-06-20
Applicant: ExxonMobil Research and Engineering Company
Inventor： Gary Christensen , Kevin J. Kelly , Shuji Luo , Heinrich R. Braun , Tobias Klande , Behrouz Engheta , Jorg F. W. Weber , Andrew E. Taggi
Abstract: This disclosure relates to heat transfer fluids for use in heat transfer systems. The heat transfer fluids comprise at least one non-aqueous dielectric heat transfer fluid. The non-aqueous dielectric heat transfer fluid has density (ρ), specific heat (cp), and dynamic viscosity (μ) properties. The heat transfer fluids have a normalized effectiveness factor (NEFfluid) as determined by the following equation: N E F fluid = DEF fluid DEF reference ; wherein DEFfluid is a dimensional effectiveness factor for the heat transfer fluid that is determined based on an equation designated in Table 1 below for a selected pump and a selected heat transfer circuit dominant flow regime; wherein DEFreference is a dimensional effectiveness factor for a reference fluid that is determined using the same equation designated in Table 1 for DEFfluid above for the same selected pump and the same selected heat transfer circuit dominant flow regime; and TABLE 1 (Heat Transfer Fluid and Reference Fluid) Selected Heat Transfer Circuit Flow Regime Transition Selected PumpLaminar(Blasius) Positive Displacement Pumpρ1 cp1 μ−1ρ0.25 cp1 μ−0.25 Centrifugal Pumpρ0.19 cp1 μ−0.19ρ0.04 cp1 μ−0.04 wherein the heat transfer fluid has a NEFfluid value equal to or greater than 1.0. This disclosure also provides a method for improving performance of a heat transfer system, a method for improving performance of an apparatus, and a method for selecting a heat transfer fluid for use in a heat transfer system. The heat transfer fluids and methods of this disclosure are applicable in situations where the heat transfer system is dominated by heat conveyance.
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公开(公告)号：US20210040369A1
公开(公告)日：2021-02-11
申请号：US16986314
申请日：2020-08-06
Applicant: ExxonMobil Research and Engineering Company
Inventor： Behrouz Engheta , Tobias Klande , Heinrich R. Braun , Andrew E. Taggi
Abstract: This disclosure relates to heat transfer fluids for use in an apparatus having a heat transfer system. In one embodiment, the heat transfer fluids have at least one Group IV base oil, as a major component; at least one phenolic antioxidant, as a minor component; and optionally an aminic antioxidant in an amount less than about 0.25 weight percent, based on the total weight of the heat transfer fluid. In another embodiment, the heat transfer fluids have at least one Group V base oil, as a major component; and a mixture of at least two antioxidants, as a minor component. The at least one Group IV base oil and the at least one Group V base oil have a kinematic viscosity (KV100) from about 0.5 cSt to about 12 cSt at 100° C. The mixture of at least two antioxidants has a phenolic antioxidant and an aminic antioxidant. This disclosure further relates to methods for improving thermal-oxidative stability of a heat transfer fluid used in an apparatus having a heat transfer system.
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