Non-aqueous heat transfer fluid and use thereof

A technology of heat transfer fluid and heat exchange system, which is applied in the field of low-toxic fluid preparation, can solve the problems of toxicity and additive toxicity, and achieve the effects of reducing overheating, preventing cavitation corrosion, and reducing losses

Inactive Publication Date: 2004-09-29
EVANS COOLING SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] Additionally, some additives themselves, such as borates, phosphates and nitrites, are considered toxic
Thus, not only do all known coolant concentrate formulations containing additives involve the need for heat, vigorous stirring, and prolonged time for the water to react and the additives to dissolve, but the additives themselves are sometimes toxic

Method used

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  • Non-aqueous heat transfer fluid and use thereof
  • Non-aqueous heat transfer fluid and use thereof
  • Non-aqueous heat transfer fluid and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] This corrosion test was performed using the test procedure described in ASTM #D-1384 (Revised Edition). Six substances, which are typical metals found in engine coolant systems, were completely immersed in the test coolant contained in glass vessels. Coolant "A" is a non-aqueous heat transfer fluid of the present invention in which the proportion of polyol is 100% PG. Coolant "B" is a conventional engine coolant formulation consisting of EG-based antifreeze concentrate mixed with water.

[0123] In the ASTM test procedure, the coolant is aerated with air bubbling through a glass vessel and maintained at a test temperature of 190°F (88°C) for 336 hours. This procedure was changed to more accurately reflect the conditions experienced by metals in engine coolant systems in service. Tests were conducted at a control temperature of 215°F (101.6°C) to simulate heavy-duty use. Coolant "A" was tested without an air charge in order to more closely approximate operation in non...

Embodiment 2

[0144] Corrosion testing is performed to determine the amount of corrosion of cast aluminum or magnesium alloys in engine coolants under heat rejection conditions. A sample of cast aluminum alloy typically used in an engine cylinder head or cylinder block is contacted with a test engine coolant solution. Coolant "A" is a non-aqueous coolant of the present invention consisting of 100% PG. To simulate the operating conditions of coolant systems using coolants other than water, tests using Coolant "A" were conducted at a temperature of 275°F (135°C) and a pressure of 2 psig (13.79kPa), which is slightly higher than Atmospheric pressure. Test coolant "B" contained corrosive water as specified by ASTM and was used to make up the water portion of a 50 / 50 PG / EG water coolant. The test conditions for Coolant B were to simulate the conditions in an aqueous coolant engine cooling system, a temperature of 275°F (135°C) and a pressure of 28 psig (193 kPa).

[0145] For each test, the h...

Embodiment 3-

[0150] Embodiment 3-field test

[0151]Operate a 3.8L V-6 engine on the road for a test period of 55,000 miles (88,511.5 kilometers). The engine cooling system of a vehicle is constructed as described in US Patent 5,031,579. Coolant "A" was the same non-aqueous coolant described in Example 1 above. During the test period, the coolant was not drained or replaced. The metal sample pack was placed in the full flow of the engine coolant flow (lower hose) and kept submerged in the coolant at all times. The ability of the test coolant to inhibit metal corrosion was evaluated by comparing the weight loss (in milligrams) of the specimens at the end of the test period to the ASTM test standard. The result looks like this:

[0152] Δweight (mg)

[0153] Metal Coolant "A" ASTM Standard

[0154] Cast iron -2.8 -10

[0155] Aluminum +0.2 -30

[0156] Steel -1.1 -10

[0157] Copper -1.3 -10

[0158] Solder -3.7 -30

[0159] Brass -0.9 -10

[0160] Starting pH +7.1 NA

...

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Abstract

The present invention provides a non-aqueous, low toxicity polyol-based heat transfer fluid containing at least one polyol, such as propylene glycol, which acts as an alcohol dehydrogenase enzyme inhibitor to reduce the toxicity of ethylene glycol. The heat transfer fluid also contains a corrosion inhibitor soluble in the polyol used as the heat transfer fluid. The heat transfer fluid can be used, for example, as an internal combustion engine coolant for automobile engines, as a coolant for electrical or electronic components, as a heat transfer fluid for solar heating systems or as a heat transfer fluid for temperature maintenance in industrial processes. The present invention also provides a low toxicity fluid formulated for absorbing water in a heat exchange system prior to installation of the heat transfer fluid of the present invention, the fluid consisting of ethylene glycol containing at least one polyol, preferably propylene glycol, wherein the polyol Acts as an alcohol dehydrogenase enzyme inhibitor.

Description

[0001] related application [0002] This application is a continuation-in-part of US Patent Application Serial No. 09 / 910,497, filed July 19,2001. field of invention [0003] In general, the present invention relates to the essence of heat transfer fluids used in heat exchange systems, such as coolants for internal combustion engines, coolants for electrical or electronic components, heat transfer fluids for solar heating systems, or for maintaining temperature in industrial processes Non-aqueous, low toxicity heat transfer fluid. The invention also relates to a compatible low toxicity formulated fluid for absorbing residual water from a heat exchange system formulated for installation of said non-aqueous heat transfer fluid. Background of the invention [0004] Heat transfer fluids are used for a variety of purposes. One common use of heat transfer fluids is as a coolant for internal combustion engines. Most heat transfer fluids in use today contain water mixed with ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/08C09K5/10C09K5/20C23F11/08C23F11/12C23F11/14C23F11/18F28F19/00
CPCC23F11/08C09K5/20C09K5/10
Inventor 约翰·W·埃文斯J·托罗斯·莱特
Owner EVANS COOLING SYST INC
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