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Ekonomisk och energieffektiv användning av motorvärmare: utvärdering av effekten på bränsleförbrukning vid värmning av smörjolja jämfört med värmning av kylvatten
Swedish National Road and Transport Research Institute, Society, environment and transport, Environment.
Swedish National Road and Transport Research Institute, Society, environment and transport, Environment.
Swedish National Road and Transport Research Institute, Infrastructure, Measurement technology and engineering workshop.
2014 (Swedish)Report (Other academic)Alternative title
Energy efficient use of engine heaters : evaluating the effect of heating lubricating oil compared to heating cooling water (English)
Abstract [sv]

En pilotstudie visar att motorvärmning via kylvattnet är mer bränsleeffektivt än att värma smörjoljan. Kallstart av motorfordon ger högre bränsleförbrukning och mer utsläpp eftersom en kall motor innebär att en större friktion behöver övervinnas. Att värma motorn i förväg minskar kallstartseffekterna. Traditionellt sett har motorvärmning skett genom att kylvattnet värmts, vilket i sin tur värmt motorblocket. Syftet med denna studie var att undersöka om det skulle vara mer energieffektivt att värma smörjoljan i stället för kylvattnet. Hypotesen var att en varmare smörjolja leder till mindre friktion i motorn, vilket i sig skulle innebära att det behövs mindre bränsle för att överkomma friktionsmotståndet. Resultaten av testerna visar att kallstartseffekten med en ökad bränsleförbrukning minskar mest genom att värma kylvattnet. Ju varmare kylvattnet är vid motorstart desto mindre bränsleförbrukning. När de totala energibehoven för kallstarter beräknas, det vill säga bränsleförbrukning plus el för motorvärmning, är resultaten inte lika tydliga beträffande vilket alternativ som är energieffektivast. Den minskade bränsleförbrukningen som resulterar av förvärmning tas till viss del ut av den elförbrukning som behövs för själva motorvärmningen. En fördel i sammanhanget är att de lokala utsläppen minskar och om man ser till att den svenska elproduktionen till stor del består av vattenkraft samt kärnkraft så ger motorvärmning lägre utsläpp totalt sett.

Abstract [en]

Test results show that the cold-start effect with increased fuel consumption is reduced most by heating the cooling water, compared to heating the lubricating oil. Starting an engine when it is cold gives rise to higher fuel consumption and emissions as a cold engine means that a larger friction needs to be overcome and that the combustion is not optimal. To warm the engine in beforehand leads to lesser cold start effect. Traditionally, engine heating has been made by heating the cooling water, which in turn heats the engine block. The purpose of this study was to examine whether it would be more energy efficient to heat the lubricating oil instead of the cooling water. The hypothesis was that a warmer lubricating oil leads to less friction in the engine, which in itself would mean that less fuel to overcome the frictional resistance is needed. Likely, there may be differences in the usefulness of engine heater between cars with gearbox integrated with motor and without such integration. The results of the tests show that the cold-start effect with increased fuel consumption is reduced most by heating the cooling water. The warmer the cooling water is at engine start, the less fuel consumption by the engine start. When the total energy needs for cold starts is calculated, i.e. fuel consumption plus electric use due to engine heating, the results are not as clear regarding which option is the most energy efficient. The reduced fuel consumption as result of pre-heating is overcome by the electricity consumption needed for the actual motor heating. One advantage is that the local emissions will decrease. Since the Swedish electricity production to a large extent is based on emission free production technology, it is most likely that the total emissions are reduced.

Place, publisher, year, edition, pages
Linköping: VTI , 2014. , 34 p.
Series
VTI notat, 22-2014
Keyword [en]
cold starting, fuel consumption, lubricant, temperature measurement, test
National Category
Engineering and Technology
Research subject
Road: Vehicles and vehicle technology, Road: Vehicles and the environment; Railway: General works, surveys, comprehensive works, Railway: Environment
Identifiers
URN: urn:nbn:se:vti:diva-6923OAI: oai:DiVA.org:vti-6923DiVA: diva2:725992
Available from: 2014-06-17 Created: 2014-06-17 Last updated: 2017-03-30Bibliographically approved

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Carlson, AnnelieHammarström, UlfBladlund, Mikael
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