EETF: Safe Efficient Exhaust Thimble

Project Overview
Current exhaust thimbles are extremely inefficient and are a main cause of heat loss with indoor engines. This project, performed by University of Alaska, Fairbanks, aims to find a solution to this situation.

Project Objectives
This project aims to text the flow velocity of the air along with the air temperature through the cooling channels. Another goal of the project is to test the heat dissipation from the exhaust stack to the building structure. The thimble height, thickness, and insulation thickness will be varied to determine which combination yields the optimal arrangement.

Thimbles are a necessary piece of exhaust equipment because they provide some insulation between the exhaust pipe and the building structure. Thimbles are required by the National Fire Protection Association to protect structures from the hot exhaust pipe as the pipes exit the building. Traditional thimbles have a diameter that is six inches greater than the pipe which leads to much airflow into the room as the engine uses air. Since the air coming in from outside is usually cold the room is cooled by the incoming air which is the root cause of this inefficiency. The thimble design being tested in this project works to heat the air coming in using the hot exhaust. This would help greatly improve the efficiency of the thimble and would help cut down heating costs.

Administration of Funds

The Alaska Energy Authority has been placed in charge of administration for the Emerging Energy Technology Fund projects. More information can be found on their website here

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