111

 1 import matplotlib.pyplot as plt
 2 import numpy as np
 3 
 4 
 5 x = np.arange(0, 20, 0.1)
 6 
 7 
 8 def d_change(d):
 9     y = 1/(8*(x/d)+1)
10     return y
11 
12 
13 y1 = d_change(1)
14 plt.plot(x, y1, label="glass thickness:d=1")
15 y2 = d_change(5)
16 plt.plot(x, y2, label="glass thickness:d=5")
17 y3 = d_change(10)
18 plt.plot(x, y3, label="glass thickness:d=10")
19 y4 = d_change(20)
20 plt.plot(x, y4, label="glass thickness:d=20")
21 plt.xlabel("Air layer thickness:l")
22 plt.ylabel("Heat loss ratio:y")
23 plt.title("Relationship between heat ratio and air layer thickness")
24 plt.legend()
25 plt.show()