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Thermal Energy Transfer

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Introduction

GCSE Coursework Thermal Energy Transfer Aim: To investigate the factors that effect the time it takes for a hot drink to cool down. I have decided to change the volume of the water for my investigation, using four different volumes. They were - 100ml, 200ml, 300ml and 400ml. Abstract After making a cup of coffee it loses heat because of the following factors: � Radiation � Conduction � Convection My investigation is to find out the rate of which heat transfer happens. Heat transfer is a process in which energy in the form of heat energy is exchanged between materials that are at a different temperature. Heat is generally transferred by conduction, convection, radiation. All of these processes can all happen simultaneously but it is likely that one will give the greater heat exchange. Heat is exchanged through the brick wall by conduction. The surfaces of a high-speed aircraft are heated up by convection. The earth is heated by heat that is being radiated from the sun. These experiments involved the temperature of hot water being recorded at chosen intervals in a plastic cup. ...read more.

Middle

Depending on how many times the material has been wrapped around the cup will determine how fast the heat transfer is. If it has been wrapped around several times then the insulator will work better than if it has only been wrapped around only once. * What the cup is made of. The material of the cup could change the rate of heat loss. If it is made from polystyrene it will not allow much heat to pass through it. If it is made of metal then it will allow more heat to pass through it. * If the inside of the cup is painted will make a difference. If it is painted silver then it reflect some heat back to the water, but if it is painted black it will absorb the heat and pass it out the other side. * Room temperature. If the temperature of the room is near the starting temperature of the water then heat process of heat loss will not be as fast. This is because if there is a bigger difference in temperature then the more heat will try to escape. ...read more.

Conclusion

If I could improve my experiment, firstly, I could make sure that I set up the stopwatches faster. Also if I made the cooling time longer to have more results and compare them better. And I think, that a major improvement on the experiment would be if we had completed both tests on one single day, therefore keeping the room temperature the same for both tests and making them fairer. The experiment was good enough to see if the amount of water (volume) goes down by half, then the temperature drop in six minutes will go down by half. Because in a larger volume of water there are more particles, which give off more heat, and this means that it will take longer for that volume to cool down. Results table Tempreture(�C) 100ml Average 200ml 1 200ml 2 200ml Average 300ml 1 300ml 2 3ooml Average 400ml 1 400ml 2 400ml Average 57.15 55.7 55.5 55.6 65.1 65.5 65.3 66.9 66.7 66.8 56.1 55.3 55.4 55.35 64.5 64.8 64.65 66.4 66.1 66.25 53.8 55 54.8 54.9 63.9 64 63.95 65.8 65.6 65.7 53.05 54.7 54.4 54.55 63.3 63.5 63.4 65.4 65.1 65.25 51.75 54.2 53.9 54.05 62.7 62.6 62.65 64.9 64.6 64.75 50.1 52.8 52.7 52.75 62 62.2 62.1 64.2 64.1 64.15 2.9�C 2.8�C 3.1�C 3.3�C 2.7�C 2.6�C ...read more.

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