Title

Heat Exchanger

Document Type

Creative works or constructive object presentation

Campus where you would like to present

Ellensburg

Event Website

https://digitalcommons.cwu.edu/source

Start Date

18-5-2020

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. To manufacture the water to air heat exchanger, a series of copper pipes will run through aluminum fins, and a fan mounted to the unit. Glycol will be circulated through the unit and run through a copper coil submersed in the water jet tank. A circulating pump will be used to circulate glycol through the system. 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.

Faculty Mentor(s)

John Choi

Department/Program

Engineering, Technologies, Safety & Construction

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May 18th, 12:00 PM

Heat Exchanger

Ellensburg

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. To manufacture the water to air heat exchanger, a series of copper pipes will run through aluminum fins, and a fan mounted to the unit. Glycol will be circulated through the unit and run through a copper coil submersed in the water jet tank. A circulating pump will be used to circulate glycol through the system. 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.

https://digitalcommons.cwu.edu/source/2020/CEPS/35