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Publikationer från KTH
Bachelor thesis . 2017
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Heated Dipstick

Authors: Wattle Björk, Sebastian; Ali, Omar;
Abstract

Starting an engine in low temperatures creates unnecessary wear on components due to the insufficient lubrication of cold engine oil. A cold engine produces more emissions and consumes more fuel. Not all cars are equipped with engine heaters and installing an aftermarket heater is both expensive and time consuming. The aim with this project is to develop a universal engine heater with the ability to heat engine oil efficiently. Installing the engine heater should not require any special tools or expertise. To create a universal engine heater the construction is flexible similar to an electric cable and the length can be modified. The lower part, in contact with the engine oil, contains a resistor with an outside cover of steel to efficiently transfer heat. The challenge is to create an engine heater that is efficient in heating the engine oil while being small enough to fit in most cars. The surface area of the heater plays a large role when it comes to transfer heat efficiently. To heat 6 liters of engine oil from - 20 ° to -6° C takes roughly 2 hours with conventional surface area. By doubling the area by using another design, the same temperature can be reached in about 30 minutes. Att starta en motor i minusgrader sliter mycket på invändiga komponenter. Detta då motoroljan på grund av högre viskositet inte smörjer lika bra, vilket i sin tur leder till att oljan inte kan cirkulera i motorn. Dessutom släpper en kall motor ut större mängder föroreningar i luften och förbrukar mer bränsle. Alla bilar är inte utrustade med motorvärmare och att eftermontera är både kostsamt och tidskrävande. Målet med projektet är att ta fram en universell motorvärmare med kapacitet att värma upp motoroljan i en personbil på ett effektivt sätt. Motorvärmaren ska inte kräva några speciella verktyg för att monteras och den ska vara lika lätt att montera som den ordinarie oljestickan. Motorvärmaren är konstruerad av ett elastiskt material likt en elsladd för att vara universellt passande. Den nedre delen i kontakt med motoroljan omsluter en resistor och har ett yttre hölje av stål för att ha god värmeöverföringsförmåga. Utmaningen är att konstruera en sticka som kan värma motoroljan tillräckligt snabbt och som är tunn nog att föras in i oljetråget utan hinder. En stor påverkande faktor gällande motorvärmarens prestanda är kontaktytan mellan motorvärmare och motorolja. Att värma upp 6 liter motorolja från -20 till -6° C tar drygt två timmar med oljestickans geometri. Med dubbla kontaktytan kan samma temperatur nås på drygt 30 minuter och denna areaändring kan ske genom att ändra motorvärmarens design.

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Keywords

motorolja, mineral oil, engine oil, Oljesticka, Mechanical Engineering, Heat transfer, termodynamik, Dipstick, Syntetisk olja, Thermodynamics, synthetic oil., värmeöverföring, Maskinteknik

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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