Pasco TD-8564 THERMAL EFFICIENCY APPARATUS Manuel d'utilisateur télécharger pdf (Page 9)

012-05443A Thermal Efficiency Apparatus

by using the chart located on the front of the Thermal

Efficiency Apparatus and in Table 1. Notice that as the

temperature increases, the thermistor resistance decreases

(100 kΩ is a higher temperature than 200 kΩ).

➤ NOTE: To get the exact temperature reading

the user must interpolate between numbers on the

chart. For example, suppose the ohmmeter reads

118.7 kΩ. This reading lies between

120 kΩ = 21°C and 115 kΩ = 22°C. The reading is

120-118.7 = 1.3 kΩ above 21°C which is

1.3kΩ×

1°C

120 – 115kΩ

= 0.26°

Therefore 118.7 kΩ is 21.26°C.

Measurements Using the Thermal Efficiency Apparatus

Direct Measurements

Three quantities may be directly measured with the

Thermal Efficiency Apparatus: temperatures, the power

delivered to the hot reservoir, and the power dissipated by

the load resistors. The details of how these measurements

are made follow.

Temperatures

The temperatures of the hot and cold reservoirs are

determined by measuring the resistance of the thermistor

imbedded in the hot or cold block. To do this, connect an

ohmmeter to the terminals located as shown in Figure 4.

The switch toggles between the hot side and the cold side.

The thermistor reading can be converted to a temperature

461 -5

436 -4

413 -3

391 -2

370 -1

351 0

332 1

315 2

298 3

283 4

269 5

255 6

242 7

230 8

218 9

207 10

197 11

187 12

178 13

169 14

161 15

153 16

146 17

139 18

133 19

126 20

120 21

115 22

109 23

104 24

100 25

95.4 26

91.1 27

87.0 28

83.1 29

79.4 30

75.9 31

72.5 32

69.3 33

66.3 34

63.4 35

60.7 36

58.1 37

55.6 38

53.2 39

51.0 40

48.9 41

46.8 42

44.9 43

43.0 44

41.2 45

39.6 46

37.9 47

36.4 48

34.9 49

33.5 50

32.2 51

30.9 52

29.7 53

28.5 54

27.4 55

26.4 56

25.3 57

24.4 58

23.4 59

22.5 60

21.7 61

20.9 62

20.1 63

19.3 64

18.6 65

17.9 66

17.3 67

16.6 68

16.0 69

15.5 70

14.9 71

14.4 72

13.8 73

13.4 74

12.9 75

12.4 76

12.0 77

11.6 78

11.2 79

10.8 80

10.4 81

10.1 82

9.76 83

9.43 84

9.12 85

8.81 86

8.52 87

8.24 88

7.96 89

7.70 90

7.45 91

7.21 92

6.98 93

6.75 94

6.53 95

6.33 96

6.12 97

5.93 98

5.74 99

5.56 100

5.39 101

5.22 102

5.06 103

4.91 104

kΩ °C kΩ °C kΩ °C kΩ °C kΩ °C

Table 1: Resistance to Temperature Conversion Chart

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 33 34

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