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Table 1 Statistic of the variables for 915 samples of in service water-in-glass evacuated tube solar water heaters (Liu et al. 2015a, b)

From: Extreme learning machine: a new alternative for measuring heat collection rate and heat loss coefficient of water-in-glass evacuated tube solar water heaters

Item

Tube length (mm)

Number of tubes

TCD (mm)

Tank volume (kg)

Collector area (m2)

Angle (°)

Final temp. (°C)

HCR

HLC

Maximum

2200

64

151

403

8.24

85

62

11.3

13

Minimum

1600

5

60

70

1.27

30

46

6.7

8

Range

600

59

91

333

6.97

55

16

4.6

5

Average

1811

21

76.2

172

2.69

46

53

8.9

10

SD

87.8

5.8

5.11

47.0

0.73

3.89

2.0

0.48

0.77

  1. TCD tube center distance, temp. temperature, HCR heat collection rate (MJ/m2), HLC heat loss coefficient [W/(m3K)]
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