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Factors Affecting Heat Loss.

Extracts from this document...

Introduction

Rina Bhudia                           Radiation, Factors Affecting Heat Loss                                         10B3

Science Investigation

Factors Affecting Heat Loss

Introduction:

There are three main types of heat transfer, Convection, conduction and radiation. We are asked to do and experiment heat loss using one of the heat transfer. Our group chosen to do radiation because it would be a straight forward experiment and I understood the task of the experiment. We will be using Aluminium foil, both the shiny and matt sides, white colour paper, black colour paper and corrugated cardboard.

Radiation:

The hotter the object is the more heat energy it radiates. Different surfaces affect radiation. It depends an awful lot on surface colour and texture. Dark matt materials absorb the radiation falling on them. Much more strongly than bright glossy surfaces such as gloss white or silver. They also emit heat radiation much more to.  Silvered surfaces reflect almost all heat radiation falling on them. Dark matt materials are poor reflectors and light surfaces are poor absorbers.

Conduction:

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Middle

300

62.5

63

63

62

360

61

62

60

61

420

60.5

61.5

59.5

60.5

480

60.5

60

57.5

59

540

60

59.5

56

58.5

600

59

58

55.5

57.5

660

58.5

57.5

55

57

720

57.5

57.5

54

56

780

56

56

53.5

55

840

55.5

55

52

54

900

55.5

55.5

52.5

54

Black Paper

Time in sec

Experiment 1

Experiment 2

Experiment 3

Average

60

65

70

69

68

120

64

69

73

68

180

63

68

70.5

67

240

61

66

69

65

300

60

65

68

64

360

60

64.5

66

63.5

420

59

64

65

62

480

58

63

64

61

540

58

62

64

61

600

57

61.5

63

61

660

56.5

61

61

59.5

720

56

60

60

58

780

55

60

59

58

840

54.5

59

59

57.5

900

54

58

58

56

Foil Matt

Time in sec

Experiment 1

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Conclusion

Evaluation:

I performed my experiment very well by making it as fair as I could by putting exactly 100 cubic centimetres in each cylinder. I can improve it by using a variety of different materials to get a wider range of results.

  My prediction was correct as the materials that i said was emit and absorb heat were correct. The black and matt surfaces were bad reflectors but good absorbers; where as the glossy bright colours were good at reflecting but poor at absorbing.

  I could improve my experiment next time by making I a fairer test by being more accurate and precise, and making that the water entered all the beakers at the same time. I cold also make it fairer by doing the whole experiment in one day, including different variations and repeating it three times.

...read more.

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Here's what a teacher thought of this essay


** Unfortunately although the candidate recorded some useful data in a fairly simple experiment, there is no conclusion or evaluation of the results. This would result in a low mark for this reason.
To improve:
Planning
The candidate should try to include some useful secondary sources of information to help inform the planning. The key variables in the experiment need to be listed and an explanation given of how they are to be controlled. A risk assessment should be included as this is now a requirement of many courses.
Carrying out
The candidate has recorded useful data in a number of tables but these would lose marks since they do not have clear headings with the units included.
Analysis and Evaluation
These sections were not included so no comment can be made except to say that to gain a good grade is impossible without them.

Marked by teacher Stevie Fleming 15/10/2013

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