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# Heat Efficiency.

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Introduction

Heat Efficiency. I am attempting to find out how different types of insulation affect the rate at which water cools down. I am going to do this by timing how long it takes for water to cool down when insulated by three different materials, which are: foam, bubble wrap and no insulation. I will control the starting temperature of the water and the amount of water used. Also I will make sure convection is unable to work in my experiment, this is because my insulation will be wrapped around the sides of the container and heat loss through convection occurs when air or liquids rise up. I predict that the bubble wrap will keep the water hot for longest, this is because bubble wrap has pockets of air which will heat up by waves of heat energy. This is called radiation. Therefore the bubble wrap will become a heated insulator and the water will stay hot for longer. ...read more.

Middle

I can not start at 100 degrees centigrade because by the time I have poured the water separately into all three tin cans the water temperature would have dropped and it would not be a fair experiment. I have made this investigation fair by using the same amount of water in each experiment, and making the starting temperature for each experiment equal. I believe that I have a sufficient and accurate enough range of measurements to obtain good information. I will be repeating my experiment three times. Results. Experiment 1. Time (mins) No Insulation Bubble Wrap Foam 3 40 degrees c 55 degrees c 49 degrees c 6 30 degrees c 37 degrees c 40 degrees c 9 27 degrees c 32 degrees c 30 degrees c Experiment 2 Time (mins) No Insulation Bubble Wrap Foam 3 44 degrees c 52 degrees c 47 degrees c 6 29 degrees c 35 degrees c 39 degrees c 9 26 degrees c 29 degrees c 27 degrees c Experiment 3 Time (mins) ...read more.

Conclusion

This helps to prove my prediction and support my results. On the graph the temperatures of the water seem to go down fairly evenly and steadily. I believe this has something to do with the equal space between the times that I took measurements. I think the experiment went very well, and that my results are accurate. This is because I repeated the experiment three times and all sets of results are very close. The only odd result I found was in experiment two when the measurement taken after 6 minuets for the bubble wrap was lower than that of the foam, I believe that this is just a cause of experimental error. I could have had more intervals at which I took the temperatures of the water; this would have given me more information to back up my results, however I believe that my set of results still helped me support my prediction. Finally I would like, in future, to carry out an experiment which will tell me if the spacing of the times that measurements are taken affect the evenness of the measurements. ...read more.

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