Analytical and Experimental Evaluation of a Thermally Insulated Automotive Exhaust System

Hartsock, Dale L.; Stiles, Ernest D.; Bable, William C.; Kranig, John V.

doi:10.4271/940312

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…The temperature indicated by surface sensors is the temperature of the tube wall, and the gas temperature can be correctly deduced only by [19,20], good agreement being obtained. It follows that values referring to immersed and surface thermocouples are consistent.…”

Section: Tests On a Spark-ignition Engine Exhaust Systemmentioning

confidence: 92%

Internal combustion engine waste heat potential for an automotive absorption system of air conditioning Part 1: Tests on the exhaust system of a spark-ignition engine

Boatto

Boccaletti

Cerri

et al. 2000

Proceedings of the Institution of Mechanical Engineers, Part D:

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Section: Tests On a Spark-ignition Engine Exhaust Systemmentioning

confidence: 92%

Internal combustion engine waste heat potential for an automotive absorption system of air conditioning Part 1: Tests on the exhaust system of a spark-ignition engine

Boatto

Boccaletti

Cerri

et al. 2000

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…With the catalytic converter beneath the chassis, such considerations played a subordinate role. The main concern there lay in limiting the converter's surface temperature so that materials beneath the vehicle did not catch fire [7] (e.g. burnt grass).…”

Section: Introductionmentioning

confidence: 99%

Thermal Management of Close Coupled Catalysts

Bauer¹,

Haldenwanger²,

Hirth³

et al. 1999

SAE Technical Paper Series

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The close coupled catalytic converter, together with the manifold and exhaust pipes, form a group of components that emit powerful heat energy. For temperature controle of the neighboring components, limiting the converter surface temperature in the same way as with underfloor systems will not be satisfactory for close-coupled converter systems, as the converter's surface temperature does not represent the only physical measure for assessing the thermal load on other components. Instead, it makes more sense, to control the heat output of the exhaust system and the heat transfer to the other components by choosing materials for the included surfaces which show good proporties to reduce radiative heat transfer. Component Catalyst Mantel-43 % ZrO2-coated catalyst mantel Aged austenite catalyst mantel Aged ferrite catalyst mantel Aluminium coated catalyst mantel

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“…Work has also been reported by General Motors [Moore and Mondt, 1993] and Ford [Hartsock et al, 1994] using insulated catalysts located well downstream of the engine. This can involve double-walled insulating pipe leading from the manifold to the catalyst, as well as high temperature refractory insulation around the catalyst itself.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis and Testing of a Vacuum Insulated Catalytic Converter

Burch¹,

Keyser²,

Potter³

et al. 1994

SAE Technical Paper Series

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Based on a recent U.S. Environmental Protection Agency (EPA) study, about 95% of all trips start after a cold-soak period of 16 hours or less. By preserving the heat in the catalyst between trips, exhaust gases could be processed without warm-up delay and without the usual cold-start emissions.Vacuum insulation and phase change thermal storage have been incorporated into a catalytic converter design to enhance its heat-retention time.Laboratory testing of a bench-scale prototype showed that a "light off' temperature (above 350°C) could be maintained during a 1 0-hour cold soak.Design improvements currently being tested should increase this heat-retention time··to more than 16 hours. The thermal conductance of the vacuum insulation will be made continuously variable to prevent overheating and excessive thermal cycling. This approach to thermal management may be more durable and less costly than quick-heat methods using electric or fuel-fired preheat catalysts. BACKGROUND

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Analytical and Experimental Evaluation of a Thermally Insulated Automotive Exhaust System

Cited by 11 publications

References 6 publications

Internal combustion engine waste heat potential for an automotive absorption system of air conditioning Part 1: Tests on the exhaust system of a spark-ignition engine

Internal combustion engine waste heat potential for an automotive absorption system of air conditioning Part 1: Tests on the exhaust system of a spark-ignition engine

Thermal Management of Close Coupled Catalysts

Thermal Analysis and Testing of a Vacuum Insulated Catalytic Converter

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