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Värmelager - nyttjande av värmemotorns överskottsenergi
2000 (Swedish)Independent thesis Basic level (professional degree)Student thesis
Abstract [en]

In spite of the increase in cartraffic today emissions from the cars have decreased considerably, chiefly due to the introduction of catalytic purification. The increase of emissions is never the less inadequate to reach the tolerance levels of nature and humans beings. One disadvantage of catalytic converter technique is that it does not purify exhaust when cold starting the engine. A Heat store preheating the engine would therefor be able to decrease cold start emissions considerably. This project is a pre study to give a technical foundation to further develop an engine pre-heater. During our project we have produced a prototype of a heat store and a test bench for experimenting with the heat store prototype. We have also accomplished several experiments on the prototype. The production of and the tests on the heat store have given us knowledge and solutions concerning construction and function. The produced prototype is made of stainless steel and is similar to a thermos. We have also produced containers of copper containing salts and they were installed in the thermos. From the production and testing of the prototype improvements of constructions have been made. These improvements concern welding, attachment of the lid and the design of the gable to which the lid is assembled. The prototype was tested with the test bench consisting of boiler, circulation pump, valves, equipment to get rid of air-bubbles etc. The results in the graph show that the change in the pipe-entrance of the heat store increases layering of the coolant. When the coolant is pumped out from the heat store during one minute, you will get a power of approximately 24 kW. The importance of good insulating capacity of the heat store shows in the accomplished long-range test, where the decrease in temperature of the heat store is measured during two days and nights. To achieve energy store our project shows that latent storing is complicated. The heat store has been built with a removable lid to make it possible to test different salts and different flow technique design. This lid construction has to be modified before making new tests. Instead of a screw cap design the lid should be attached with screw-bolts to the gable. The heat store weld joint have the wrong design making vacuum isolation impossible. The salttests are few as the salt quantity used is too small. Therefore the tests aimed to flow technique modification of the pipe-entrance of heat store. The modifications should create a layering to separate cold water from warm water. There could be a problem with the layering if the waterflow is too extensive as the cold water mixes with the warm water, which makes the power output of the heat store considerably less. The testbench´s system worked well. The produced prototype fulfilled the given demands to make the tests possible. However the produced prototype lacks the high quality isolation, which disqualifies it as a product. The final test bench has a systemsolution well adapted for testing. The flow technique modification is simple but results anyhow in significant improvements of the heat store power output. Heat store is a technical solution in car industry improving the conditions for the catalytic exhaust purification when cold starting.

Place, publisher, year, edition, pages
2000. , 40 p.
Identifiers
URN: urn:nbn:se:kau:diva-54383Local ID: EMI-4OAI: oai:DiVA.org:kau-54383DiVA: diva2:1103098
Subject / course
Energy and Environmental Engineering, Bachelor of Science
Available from: 2017-05-30 Created: 2017-05-30

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  • apa
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  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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