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Insulation Coursework

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Introduction

Nicola Poultney Insulation Coursework Aim: To investigate the best methods to use to stop the hot water tank from cooling down quickly. Prediction: I think that whatever material we use the outcome of the temperatures will be better than the test, which had no insulation. (Test number 7) I think that that a lid on our small copper beaker will help. Overall I think that the rough polystyrene with a lid will be the best. Plan: Before we carried out the final test we preformed a plan test to see whether our original ideas would make a fair and correct test. We listed our thoughts for the test. Like the constants, inputs and output variables. (As shown below) We tested our thoughts and in the end changed our minds about some things. For our plan experiments we tested the water every 15 seconds for a minute. We found this was too short. In the end we changed this so that we tested the water every minute for ten minutes this was more economical. This then all together left us with seventy results where in the plan we would only of had twenty-eight results. Constants Variables * Start temperature (as close as possible) * 100ml of water * Testing time 10mins every min Number of results (10 per test) ...read more.

Middle

84 c 81 c 79 c 77 c 75 c 73 c 71 c 69 c 67 c 65 c Test5 - with woollen insulator, rough textured polystyrene no lid Start 1minute 2minutes 3minutes 4minutes 5minutes 6minutes 7minutes 8minutes 9minutes 10minutes 89 c 86 c 84 c 80 c 78 c 76 c 74 c 72 c 70 c 69 c 68 c Test6 - woollen insulator, rough textured with lid Start 1minute 2minutes 3minutes 4minutes 5minutes 6minutes 7minutes 8minutes 9minutes 10minutes 83 c 81 c 79.5 c 78 c 76.5 c 76 c 75 c 74 c 73.5 c 72 c 71.5 c Test7 - No insulation. Just copper beaker Start 1minute 2minutes 3minutes 4minutes 5minutes 6minutes 7minutes 8minutes 9minutes 10minutes 85 c 82 c 79 c 76 c 75 c 73 c 70 c 69 c 66 c 64 c 60 c Graphs: My graphs are divided into 3. Each set of results using the same kind of polystyrene whether with or without a lid are compared to (test 7) the test where the copper beaker was tested on its own. Calculations: Which combination of materials works out to be the best? Rate of cooling, (this is worked out by the temperature drops added together than divided by 10) Test1 = 87-84, 84-82, 82-78.5, 78.5-76, 76-74, 74-72, 72-70, 70-68.5, 68.5-67,67-65.5 3 + 2 + 3.5 + 2.5 + 2 + 2 + 2 + 1.5 + 0.5 ...read more.

Conclusion

From my cooling rate calculations I can see that test 2 has the lowest average cooling rate meaning this combination of materials is the better insulator. Conclusion: From my experiments I can see that that test number 2 was the overall winner from the cooling rate calculations but on the graphs I can see that on graph (tests 1 and 2) the experiment with lid was the best. On the graph (tests3 and 4) the experiment with silky polystyrene and no lid was the best. On the graph (tests and 6) the experiment with rough polystyrene with lid was the best. Overall I think the experiments with a lid insulated the water better. Evaluation: I found that performing a set of plan experiments very helpful because I found that some of my ideas to find out the overall answer were not correct. If I hadn't of found the faults out then my experiments would have been a waste of time. I found that all results were helpful showing different materials capabilities but I found that working out of cooling rate was more helpful because reading from the graphs was proving difficult due to the differences in start temperatures. If I was to re do this experiment I think if I can more time I could of experimented with a wider range of materials and test further layers to try and improve the insulation. It is hard to keep the experiments fair throughout a range of different tests but on the whole I think our tests were successful. ...read more.

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