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Week 5: Pre-Lab

It was realized during the testing in Week 4 that a significant design change was required in order to boost the function of the heat pipe. The team assumed that a smaller diameter pipe would improve working fluid circulation at higher temperature values but it was soon discovered that this was not necessarily true. Our results showed a decreased performance with smaller pipe diameters and longer heat pipe lengths. To combat this issue, a redevelopment of the heat pipe design is necessary. One of the vital pieces of a heat pipe is that the interior is in a partial vacuum or the pipe is completely evacuated of air allowing for maximum working fluid circulation. This important component in the design of a heat pipe gives it its function to rapidly disperse heat from one end to the other. As demonstrated in this video. Future heat pipe designs are going to utilize a method to evacuate air from the pipe to provide a near vacuum. The vacuum is essential to higher efficiency heat pipes in all different pipe diameters. The team is going to look into borrowing a vacuum pump from a department on campus and purchase a small valve to seal off the pipe end after pipe evacuation. This should, in theory, allow the team to construct a heat pipe with high efficiency.

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Week 4: Lab

This week, prototype 3 and 4 were constructed and tested. As shown in the image below, the shorter one, prototype 4, has a length of 1 foot and the longer one, prototype 3, has a length of 2 feet. The effect of the length of the heat pipe on its efficiency is tested this week. Below is the tables and graphs of the testing done in lab this week. From the test results, it can be concluded that prototype 4 performed better than prototype 3. In 240 seconds, prototype 4 had a temperature increase of 12 degrees, while prototype 3 increased only 2 degrees. A possible reason is that the because the prototype 3 is longer in length, and so heat transfer takes longer. It is also possible due to heat loss along the length of the heat pipe.

Week 5: Lab

The team conducted some more tests on Prototype 2 as it was the best performing heat pipe constructed thus far. The test was conducted in the angled orientation as Prototype 2 hadn't been tested in that configuration yet. The results were promising as Prototype 2 exceeded expectations and transferred heat effectively throughout the test. The condenser end increased by 52 degrees over 300 seconds which was an improvement over the horizontal test conducted with Prototype 2. In both tests, the difference between the condenser temperature and the evaporator temperature was calculated and displayed on the graphs. The graph below shows the first test for Prototype 2. To verify our results the test was run a second time but for a longer period of time in order to narrow down on where the heat pipe's maximum operating temperature would be. The results are shown below. For Prototype 2, the effective temperature limit of the heat pipe can be approximated to 125 F without a hea...

Week 1

The primary focus of week 1 was to research the existing designs of a heat pipe, understand the mechanisms at which they operate, and come up with ideas to build an efficient low temperature heat pipe. The main purpose of the heat pipe is to transfer heat from one place to another. Research was conducted on low-temperature applications and the advantage and disadvantage of different designs. After analyzing the information and taking into account the time and budget restriction for this project, an initial design of the heat pipe was generated.  The heat pipe will be made of copper tubing with mesh inside the tubes to serve as a wick. There will also be Aluminum heatsink fins at the condenser end to increase surface area for the spreading of heat to the surrounding. The main tasks include research, initial design, ordering of material, generation of CAD model, construction, testing, and optimization. The design and construction of the heat pipe are limited to a budget of $400 ...