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.
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.
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