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Electronic Resource
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Publication
BMI X 653; Report; March 1974.
Language
Library's review
ABSTRACT:
A literature investigation has been carried-out wherein certain critical properties of several candidate heat-transfer fluids have been determined. The prime candidate fluids are Numbers 2, 4 and 5 fuel oil. In addition, two natural products, peanut oil and fish oil, have been evaluated.
The major findings of this investigation are the following:
1. The properties of the fuel oils vary widely with refiner and geographic location. There is a dearth of standards and those that exist are not necessarily adhered to.
2. Thermogravimetric analysis and sedimentation data for temperatures >~350 Fare not available for any of the materials.
3. The fuel oils are probably not sufficiently stable for prolonged use at elevated temperatures.
4. The natural oils, peanut and fish oil, are promising candidates although their high-temperature properties are uncertain.
5. The fused salts are promising, but the corrosive effects are uncertain.
6. Commercial heat-transfer fluids are expensive relative to the fuel oils, but the greater stability and, hence longer life, may off-set the initial higher cost for synthetic fluids.
7. Jet fuels and hydraulic fluids may have the requisite stabilities at a favorable cost.
In order to fill in the gaps in the data and provide the basis for a critical design trade-off, the following tasks are recommended:
1. Differential thermal analyses at elevated temperatures must be carried-out for the fuel oils and the natural oils.
2. Closed- and open-system sedimentation rates and viscosity-change rates should be evaluated over long periods of time at elevated temperatures.
3. A life vs initial cost trade-off should be carried-out for the commercial heat-transfer fluids vis-a-vis the fuel oils and natural oils.
4. The suitability of eutectic salts, jet fuel and hydraulic fluids should be determined relative to system requirements.
A literature investigation has been carried-out wherein certain critical properties of several candidate heat-transfer fluids have been determined. The prime candidate fluids are Numbers 2, 4 and 5 fuel oil. In addition, two natural products, peanut oil and fish oil, have been evaluated.
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The critical properties sought include: cost, specific gravity, thermal expansion coefficient, pour point, specific heat, thermal conductivity, flash point, viscosity, vapor pressure, thermogravimetric analysis (up to 600 F), additive action, materials compatibility. Cost data have also been accumulated for some commercial heat-transfer.The major findings of this investigation are the following:
1. The properties of the fuel oils vary widely with refiner and geographic location. There is a dearth of standards and those that exist are not necessarily adhered to.
2. Thermogravimetric analysis and sedimentation data for temperatures >~350 Fare not available for any of the materials.
3. The fuel oils are probably not sufficiently stable for prolonged use at elevated temperatures.
4. The natural oils, peanut and fish oil, are promising candidates although their high-temperature properties are uncertain.
5. The fused salts are promising, but the corrosive effects are uncertain.
6. Commercial heat-transfer fluids are expensive relative to the fuel oils, but the greater stability and, hence longer life, may off-set the initial higher cost for synthetic fluids.
7. Jet fuels and hydraulic fluids may have the requisite stabilities at a favorable cost.
In order to fill in the gaps in the data and provide the basis for a critical design trade-off, the following tasks are recommended:
1. Differential thermal analyses at elevated temperatures must be carried-out for the fuel oils and the natural oils.
2. Closed- and open-system sedimentation rates and viscosity-change rates should be evaluated over long periods of time at elevated temperatures.
3. A life vs initial cost trade-off should be carried-out for the commercial heat-transfer fluids vis-a-vis the fuel oils and natural oils.
4. The suitability of eutectic salts, jet fuel and hydraulic fluids should be determined relative to system requirements.
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