Study of the Frost Resistance of HDFC Based on a Response Surface Model and GM (1,1) Model

Table 4

Experimental design and results.

Codes	Experimental design			Test result (%)
	A (%)	B (mm)	C (times)
1	1.5	6	150	78.49
2	1.5	12	150	77.04
3	1.0	12	100	90.31
4	2.0	12	100	91.47
5	1.0	9	50	95.19
6	2.0	9	50	94.12
7	1.5	6	50	96.57
8	1.5	12	50	93.95
9	2.0	9	150	82.57
10	1.0	9	150	80.87
11	1.5	9	100	91.71
12	1.5	9	100	90.35
13	2.0	6	100	90.46
14	1.5	9	100	91.1
15	1.0	6	100	93.88
16	1.5	9	100	89.55
17	1.5	9	100	91.11