Document Type

Dissertation/Thesis

Date of Degree Completion

Spring 2020

Department

Mechanical Engineering Technology

Committee Chair

Dr. Craig Johnson

Second Committee Member

Professor Charles Pringle

Third Committee Member

Professor John Choi

Abstract

A water jet cutting machine can cause excess heat and humidity within a closed building, while also making it more difficult for the user to pick material off the cutting table. Water temperatures can reach as high as 150 degrees Fahrenheit in the tank. A system that would reduce the temperature of the water in a water jet tank would be beneficial for the occupants in the room in providing a better more comfortable work environment. Data was collected while the machine was in use. The data includes; temperature of water leaving the nozzle, the rate of change of tank water temperature over time. This data was used in determining design requirements for a heat exchanger system to keep water below 100 degrees Fahrenheit. A water to air heat exchanger with a rating of 20 kW was determined to be suitable for the application, assuming operation in a 88 degree Fahrenheit ambient air operating conditions. With the heat exchanger in place the temperature of the water increased at rate of 0.05 degrees Fahrenheit per minute during a 12-hour period. Without the heat exchanger in place the water temperature increased at a rate of 0.08 degrees Fahrenheit per minute. With the heat exchanger in place, the water increased in temperature 38% slower than without the heat exchanger. Keywords: water jet, heat exchanger

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