Table 4 Annual heat transfer of different insulation materials and thickness.

From: A study on optimum insulation thickness of building walls in hot summer and warm winter zone in China

Orientation

Thickness

EPS

PU

XPS

mm

Qout/kJ·m-2

Qin/kJ·m-2

Qout/kJ·m-2

Qin/kJ·m-2

Qout/kJ·m-2

Qin/kJ·m-2

South wall

10

28,272.702

190,374.397

25,803.983

177,706.218

26,437.022

178,395.627

20

21,880.909

150,848.427

19,234.625

135,324.290

19,881.780

136,457.192

30

18,002.204

124,903.244

15,520.422

109,175.032

16,106.166

110,512.353

40

15,382.721

106,579.248

13,119.701

91,492.881

13,643.183

92,874.128

50

13,489.806

92,952.093

11,426.532

78,745.258

11,896.177

80,094.326

60

12,049.172

82,416.430

10,165.197

69,123.305

10,588.482

70,407.734

70

10,913.819

74,027.690

9186.173

61,603.638

9570.724

62,812.698

80

9994.075

67,189.942

8400.835

55,562.868

8754.206

56,697.338

90

9232.737

61,509.551

7754.233

50,601.611

8081.213

51,665.538

North wall

10

47,832.207

150,657.93

44,089.23

141,144.57

45,001.662

141,101.25

20

37,788.212

119,787.28

33,465.021

108,037.04

34,480.934

108,216.37

30

31,370.544

99,395.466

27,147.798

87,433.143

28,114.960

87,785.006

40

26,906.713

84,942.745

22,943.069

73,423.42

23,834.264

73,854.875

50

23,610.777

74,162.682

19,931.118

63,287.623

20,746.429

63,743.334

60

21,071.721

65,812.338

17,662.136

55,615.925

18,408.461

56,068.15

70

19,052.609

59,153.092

15,887.239

49,607.055

16,573.152

50,041.894

80

17,406.067

53,717.968

14,458.525

44,772.283

15,091.840

45,184.31

90

16,036.118

49,197.074

13,281.945

40,797.103

13,869.344

41,185.1