Coolant composition, apparatus containing the same, and method of cooling the apparatus using the same.

Abstract

To provide a coolant composition excellent in insulation performance and cooling performance, equipment containing the same, and a method of cooling the equipment using the same.SOLUTION: The coolant composition has a C value, which is a numerical value in the left-hand side of the formula (1) shown in the figure, in the range from 3.000×10-2 to 4.950×10-2 inclusive. In the formula (1), ρ represents density (g / cm3), Cp represents specific heat (J / g °C), k represents heat conductivity (W / mK), and μ represents kinematic viscosity (cSt).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This disclosure relates to a coolant composition, an apparatus containing the same, and a method for cooling the apparatus using the same. [Background technology]

[0002] Coolants play the role of absorbing heat generated from a heat source and lowering its temperature. Preferred coolants are substances that have high thermal efficiency and low viscosity, are inexpensive, non-toxic, chemically stable, and do not cause corrosion of equipment.

[0003] As various electronic products, such as electric vehicles, become more sophisticated, they generate more heat during use. Controlling the heat generated by these products is a crucial consideration for smooth product operation and preventing a shortened product lifespan.

[0004] There are various conventional technologies for cooling products. Representative cooling methods include air cooling, water cooling, and oil cooling. Among these, air cooling has the advantage of not requiring a separate cooling medium. However, air cooling has the disadvantage of reduced cooling efficiency. Water cooling has the advantage of superior cooling performance due to the high thermal conductivity of water. However, water cooling has the disadvantage of difficulty in direct contact with the heat source for cooling. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Korean Published Patent Publication No. 10-2012-0112666 [Overview of the project] [Problems that the invention aims to solve]

[0006] This disclosure provides a coolant composition having excellent insulating and cooling performance, equipment containing the same, and a method for cooling equipment using the same.

Means for Solving the Problem

[0007] A first aspect of the present disclosure is a coolant composition, where the C value, which is the numerical value on the left side represented by the following formula (1), is 3.000×10or more and 4.950×10 -2 or less, in the following range: the coolant composition.

[0008]

Number

[0009] However, in formula (1), ρ represents density (g / cm 3 ), Cp represents specific heat (J / g·°C), k represents thermal conductivity (W / mK), and μ represents kinematic viscosity (cSt), respectively.

[0010] In one embodiment, the coolant composition includes a mineral base oil, and the content of the base oil with respect to the total weight of the coolant composition is at least 90 wt%.

[0011] In one embodiment, the mineral base oil has an average carbon number of 15 to 35.

[0012] In one embodiment, the coolant composition further includes an additive.

[0013] In one embodiment, the additive includes an antioxidant.

[0014] In one embodiment, the additive further includes an antifoaming agent, a corrosion inhibitor, a detergent, a dispersant, a friction modifier, an antiwear agent, an extreme pressure additive, a viscosity index improver, a pour point depressant, a viscosity regulator, or a combination thereof.

[0015] In one embodiment, the coolant composition has an electrical conductivity of 20 pS / m or less.

[0016] ​A second aspect of the present disclosure is a device including the coolant composition according to the first aspect, wherein the device is directly cooled by the coolant composition.

[0017] A third aspect of the present disclosure is a method of cooling a device, including the step of bringing the coolant composition according to the first aspect into direct contact with the device.

Advantages of the Invention

[0018] The present disclosure provides a coolant composition having excellent insulation performance and cooling performance. Use of the coolant composition can provide effective control of heat generated during operation of a device.

Brief Description of the Drawings

[0019] [Figure 1] It is a schematic diagram of a cooling performance test according to an embodiment of the present disclosure.

Modes for Carrying Out the Invention

[0020] The objects, advantages, and features of the present disclosure will become more apparent from the following detailed description and preferred embodiments related to the accompanying drawings, but the present disclosure is not necessarily limited thereto. Further, when it is determined that a specific description of related known technologies may unnecessarily obscure the gist of the present disclosure in explaining the present disclosure, the detailed description thereof will be omitted.

[0021] The present disclosure provides a coolant composition. The composition includes a base oil. In one embodiment, the base oil can be mineral oil. In other embodiments, the base oil can include mineral oil as a major base oil and can also include polyalphaolefin (PAO) and / or ester base oil as a minor base oil. In the present disclosure, the major base oil means a base oil exceeding 50 wt% with respect to the total content of the base oil.

[0022] In this disclosure, "mineral oil" refers to oil obtained by refining crude oil. Generally, PAO exhibits superior performance compared to mineral oil, but has the disadvantage of being expensive. The compositions of this disclosure are expected to simultaneously satisfy at least equivalent performance and a relatively lower price compared to using PAO alone, even though mineral oil is used as the main base oil. On the other hand, ester base oils have excellent thermal conductivity, but because they are polar, their insulating performance is lower than that of mineral oil, and they are also vulnerable to water due to the possibility of hydrolysis, so they are not suitable as the main base oil for this technology.

[0023] In one embodiment of the present disclosure, the base oil content relative to the total weight of the coolant composition may be at least 90 wt%. Specifically, the base oil content may be 90 to 98 wt%, such as 91 to 95 wt%, 92 to 97 wt%, 93 to 96 wt%, or 94 to 97.5 wt%. More specifically, the base oil content may be 92 to 98 wt%, and more specifically, 93 to 98 wt%. If the base oil content is below the above range, it is undesirable because it increases the amount of additives that are more expensive than the base oil, leading to an increase in the price of the final product, the coolant composition.

[0024] In this disclosure, the mineral oil-based base oil is not particularly limited, unless the coolant composition containing the base oil satisfies a predetermined numerical value C and a predetermined electrical conductivity as described below. Specifically, the mineral oil-based base oil of this disclosure may satisfy at least one, more specifically at least two, or more specifically all of the following characteristics.

[0025] -In terms of the average number of carbon atoms measured in accordance with ASTM D2887, the mineral oil-based base oil can have an average number of 15 to 35 carbon atoms.

[0026] -In terms of 5 wt% spillage temperature measured in accordance with ASTM D2887, the mineral oil-based base oil can have a 5 wt% spillage temperature of 240 to 410°C.

[0027] -From the perspective of 95 wt% spillage temperature measured in accordance with ASTM D2887, the mineral oil-based base oil can have a 95 wt% spillage temperature of 330 to 570°C.

[0028] -From the standpoint of paraffin content measured in accordance with ASTM D2786, the mineral oil-based base oil may have a paraffin content of 90 vol% or less.

[0029] If at least one of the average carbon number, 5wt% discharge temperature, and 95wt% discharge temperature of the mineral oil base oil contained in the coolant composition is below the above numerical range, the volatile oil content in the composition will increase, which may lead to problems with stability during use. Conversely, if at least one of the above parameters exceeds the above numerical range, the kinematic viscosity of the coolant composition will increase, resulting in poor fluidity, which may lead to problems with reduced cooling efficiency.

[0030] The coolant compositions of the present disclosure may further include additives. The additives preferably include antioxidants. The additives may further include other additives other than antioxidants, such as defoamers, corrosion inhibitors, cleaning agents, dispersants, friction modifiers, wear inhibitors, extreme pressure additives, viscosity index improvers, pour point depressants, viscosity modifiers, or any combination thereof.

[0031] In one embodiment of the present disclosure, the content of the antioxidant relative to the total weight of the coolant composition may be 3.0 wt% or less, such as greater than 0 and 3.0 wt%, 0.01 to 2.5 wt%, 0.05 to 2.0 wt%, 0.1 to 1.0 wt%, 0.5 to 1.5 wt%, etc. Specifically, the content of the antioxidant may be 2.0 wt% or less, such as greater than 0 and 2.0 wt% or less. More specifically, the content of the antioxidant may be 0.05 wt% or more and 2 wt% or less.

[0032] In addition, the content of other additives relative to the total weight of the coolant composition may be more than 0 and 8 wt% or less, such as 0.01 to 7 wt%, 0.05 to 6 wt%, 0.1 to 5 wt%, 0.2 to 3 wt%, 0.5 to 2 wt%, 1 to 4 wt%, etc. Specifically, the content of the other additives is more than 0 and 5 wt% or less, and more specifically, it may be 0.05 to 5 wt%.

[0033] The coolant composition of the present disclosure is a coolant composition, The C value, which is the numerical value on the left side represented by the following formula (1), is 3.000×10 -2 or more and 4.950×10 -2 or less within the following range.

[0034]

Number

[0035] However, in formula (1), ρ represents density (g / cm 3 ), Cp represents specific heat (J / g·°C), k represents thermal conductivity (W / mK), and μ represents kinematic viscosity (cSt), respectively.

[0036] Since each parameter (density, specific heat, thermal conductivity, and kinematic viscosity) constituting the right side in formula (1) is a parameter that changes according to temperature, in order to specify the value of the numerical value C, the parameters are measured at the same specific temperature.

[0037] In one embodiment of the present disclosure, in the coolant composition, the C value, which is the numerical value on the left side represented by formula (1), is 3.000×10 -2 to 4.950×10 -2 when measured at 40°C. The range of specific numerical values in the present disclosure should be understood to include any sub-range between the lower limit and the upper limit. The numerical value C in the range of 3.000×10 -2 to ~4.950×10 -2 is, for example, 3.000×10 -2 to 3.200×10 -2 , 3.200×10 -2 to 3.700×10 -2 , 3.600×10-2 ~4,200 × 10 -2 , 4.100 × 10 -2 ~4,600 x 10 -2 , 4.500×10 -2 ~4.950×10 -2 This includes subranges such as the following. Preferably, the range of the numerical value C is 3.200 × 10 -2 ~4.930×10 -2 This is possible. More preferably, the range of the numerical value C is 3.250 × 10 -2 ~4.920×10 -2 This is possible. More preferably, the range of the numerical value C is 3.600 × 10 -2 ~4.920×10 -2 It is possible.

[0038] If the numerical value C of the composition falls outside the above range, there is a risk that it may become difficult to use it as a coolant composition. Specifically, if the numerical value C of the composition is 3.000 × 10⁻¹⁰ -2 If the value C of the composition is less than 4.950 × 10, the efficiency of the pump used to fluidize the composition may decrease, and / or the cooling performance of the composition itself may decrease. Conversely, if the value C of the composition is less than 4.950 × 10 -2 If the amount exceeds the limit, the evaporation rate of the composition may increase, and / or the flash point of the composition may decrease, increasing the risk of fire.

[0039] In one embodiment of the present disclosure, the coolant composition may have an electrical conductivity of 20 pS / m or less. Specifically, the coolant composition may have an electrical conductivity of 19 pS / m or less, more specifically 18 pS / m or less, even more specifically 16 pS / m or less, and even more specifically less than 15 pS / m.

[0040] If the electrical conductivity of the composition exceeds 20 pS / m, electricity may flow through the composition, potentially causing a short circuit in the equipment or system, which could result in damage to the equipment or system.

[0041] The coolant composition of this disclosure can achieve both excellent insulation and cooling performance by satisfying at least one, specifically both, of the above-mentioned predetermined range of numerical value C and electrical conductivity.

[0042] This disclosure also provides equipment comprising a coolant composition according to a first embodiment. Furthermore, this disclosure provides a method for cooling equipment using the coolant composition.

[0043] The aforementioned equipment is not particularly limited as long as it is equipment that requires the removal of heat generated during use. Specifically, the equipment may be electronic equipment. Specific examples include, but are not limited to, electric vehicles, especially electric vehicle batteries, data servers, and energy storage devices.

[0044] The aforementioned device can be cooled by contact with the coolant composition of this disclosure. Specifically, the device can be cooled by direct contact between the coolant composition and the device. In the case of water cooling, the high electrical conductivity of water, which is the refrigerant, makes it difficult to apply cooling by direct contact with the device, so-called direct cooling. In the case of air cooling, although direct cooling is possible by using air as a heat exchange medium, the low specific heat of air results in a decrease in cooling efficiency. Since the coolant composition of this disclosure can directly cool the source of emission, it is possible to achieve a higher cooling efficiency compared to conventional cooling methods.

[0045] The following are examples of preferred embodiments to aid in understanding the Disclosure, but these embodiments are provided only to facilitate understanding of the Disclosure, and the Disclosure is not limited thereto.

[0046] Examples 1. Manufacturing of coolant composition Coolant compositions were prepared for Production Examples 1-5 and Comparative Production Example 1, each containing 97.5 wt% base oil, 0.5 wt% antioxidant, and 2 wt% other additives. The properties of the base oil in each of the coolant compositions are shown in Table 1 below.

[0047] [Table 1]

[0048] The physical properties of each coolant composition (based on 40°C) are shown in Table 2 below.

[0049] [Table 2]

[0050] 2. Cooling performance test The cooling of a data center server was simulated using the coolant compositions produced in Manufacturing Examples 1-5 and Comparative Manufacturing Example 1. A schematic diagram of the simulation is shown in Figure 1, and the configuration of the data center server is shown in Table 3 below.

[0051] [Table 3]

[0052] A coolant composition was introduced into and out of the data server, and cooling was performed using an immersion cooling method. The coolant composition was introduced at an inflow temperature of 25°C and an inflow velocity of 0.05 m / s.

[0053] The simulation results using each composition are shown in Table 4 below.

[0054] [Table 4]

[0055] The simulation results showed that the average temperature of CPUs cooled with the coolant compositions of Manufacturing Examples 1-5 was stably maintained within the range of 45.3-55.5°C, and no particular problems such as power flow or short circuits were observed despite immersion cooling. Therefore, the coolant compositions of this disclosure are expected to be used as new coolants capable of cooling electronic devices that generate high heat. On the other hand, in the case of Comparative Manufacturing Example 1, which falls outside the range of numerical value C of this disclosure, it was confirmed that the cooling performance was inferior compared to Manufacturing Examples 1-5. A cooling temperature difference of 1-2°C or more in the simulation under the above conditions will be understood to be very significant by those skilled in the art. Such differences are expected to become even more apparent when applied to large-scale electronic devices that generate more heat.

[0056] Any mere modification or alteration of this disclosure falls within the scope of this disclosure, and the specific scope of protection of this disclosure will be evident from the attached claims.

Claims

1. A coolant composition, The C value, which is the numerical value on the left side of the following formula (1), is 3.000 × 10 when measured at 40°C. －２ The above 4,950 x 10 －２ The range is as follows: The coolant composition has an electrical conductivity of 20 pS / m or less. The coolant composition comprises a base oil, The aforementioned base oil includes mineral base oil. A coolant composition wherein the base oil content in the coolant composition is at least 92 wt%. [Math 1] However, in equation (1), ρ is the density (g / cm³). ３ ), Cp represents specific heat (J / g·℃), k represents thermal conductivity (W / mK), and μ represents kinematic viscosity (cSt).

2. The coolant composition according to claim 1, wherein the base oil consists solely of mineral base oil.

3. The coolant composition according to claim 1, wherein the base oil content in the coolant composition is at least 93 wt%.

4. The coolant composition according to claim 1, wherein the mineral oil-based base oil has an average number of 15 to 35 carbon atoms.

5. The coolant composition according to claim 1, further comprising an additive.

6. The coolant composition according to claim 5, wherein the additive comprises an antioxidant.

7. The coolant composition according to claim 6, wherein the additive further comprises an antifoaming agent, a corrosion inhibitor, a cleaning agent, a dispersant, a friction modifier, an anti-wear agent, an extreme pressure additive, a viscosity index improver, a pour point depressant, a viscosity modifier, or a combination thereof.

8. A device comprising the coolant composition according to any one of claims 1 to 7, The device is cooled directly by the coolant composition.

9. A method for cooling equipment, A method for cooling equipment, comprising the step of bringing a coolant composition according to any one of claims 1 to 7 into direct contact with the equipment.

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