Experimental Research on the Thermal Performance of Composite PCM Hollow Block Walls and Validation of Phase Transition Heat Transfer Models

Table 3

Temperature decrements, decrement factors, time lags, standard errors, and maximum absolute errors of each block wall.

Indexes	Temperature decrements (°C)	Decrement factors	Time lags (h)	Standard errors (°C)		Maximum absolute errors (°C)
				Left surface; Eff/Ent	Right surface; Eff/Ent	Left surface; Eff/Ent	Right surface; Eff/Ent
Block walls and temperature ranges	Experimental values
Block 1 wall
Temperature range 1	17.5	4.02	6.17	0.50	0.28	0.90	0.54
Temperature range 2	49.9	4.10	5.42	0.62	0.69	1.29	1.23
Temperature range 3	51.6	4.07	5.58	0.60	0.72	1.14	1.38
Temperature range 4	61.0	3.85	5.17	1.04	0.77	1.79	1.25
Block 2 wall
Temperature range 1	19.0	5.30	7.25	0.62/0.76	0.24/0.27	0.83/1.40	0.46/0.48
Temperature range 2	51.2	5.43	6.17	0.36/0.33	0.67/0.47	0.72/2.64	1.25/0.99
Temperature range 3	51.5	5.17	6.08	0.63/1.41	0.60/0.46	0.98/2.91	1.02/0.87
Temperature range 4	65.4	5.18	5.92	0.52/1.69	0.70/0.63	1.12/3.52	1.34/1.46
Temperature range 5	6.0	5.47	7.33	0.19/0.13	0.12/0.16	0.39/0.32	0.20/0.26
Temperature range 6	10.9	5.65	6.92	0.24/0.39	0.19/0.28	0.54/0.76	0.37/0.48
Temperature range 7	15.9	5.62	6.50	0.44/0.30	0.24/0.26	0.78/0.55	0.45/0.49
Temperature range 8	20.7	5.72	7.25	0.56/0.68	0.31/0.37	1.18/1.07	0.55/0.62
Block 3 wall
Temperature range 1	19.7	6.82	7.67	0.09/0.13	0.24/0.30	0.19/0.28	0.45/0.53
Temperature range 2	53.0	6.47	7.17	0.70/0.98	0.77/0.44	1.42/1.80	1.10/0.99
Temperature range 3	56.2	6.43	6.83	0.72/0.85	0.70/0.50	1.47/1.63	1.24/1.05
Temperature range 4	67.2	5.63	5.08	0.71/0.99	0.94/1.43	1.60/2.03	2.18/3.15
Temperature range 5	20.5	6.61	6.67	0.40/0.44	0.20/0.25	0.66/0.71	0.40/0.45
Temperature range 6	30.4	6.24	5.92	0.80/0.97	0.34/0.47	1.18/1.46	0.68/0.86
Temperature range 7	40.3	6.14	5.5	0.78/1.00	0.47/0.66	1.24/1.71	1.01/1.21
Temperature range 8	49.3	5.96	5.75	0.73/1.01	0.62/0.93	1.20/1.78	1.37/1.55
PCM in the holes of Block 3 wall
Temperature range 1	—	—	—	1.73/2.18	1.29/1.88	3.30/3.13	2.34/2.66
Temperature range 2	—	—	—	2.20/2.91	1.58/2.25	4.82/4.18	3.43/4.52
Temperature range 3	—	—	—	2.22/2.25	1.74/1.50	4.96/3.61	3.76/2.92
Temperature range 4	—	—	—	2.57/2.89	2.23/2.27	5.30/4.25	4.18/5.47
Temperature range 5	—	—	—	1.44/1.94	0.99/1.50	2.81/2.72	1.96/1.78
Temperature range 6	—	—	—	1.73/2.10	1.04/1.57	3.44/3.44	2.25/2.10
Temperature range 7	—	—	—	1.66/2.52	1.17/1.71	3.47/4.03	2.39/2.83
Temperature range 8	—	—	—	1.73/2.74	1.34/1.99	3.74/4.50	2.58/3.75
Block 4 wall
Temperature range 1	19.3	5.71	6.33	0.49/0.59	0.25/0.32	1.01/1.13	0.45/0.72
Temperature range 2	49.8	5.45	6.33	1.32/1.38	0.54/0.35	2.42/2.64	1.13/0.61
Temperature range 3	56.1	5.96	6.33	1.31/1.26	0.65/0.26	2.50/2.50	1.24/0.71
Temperature range 4	62.7	4.87	5.92	1.37/1.43	0.50/0.45	2.75/3.04	1.05/0.98
Temperature range 5	19.9	5.45	5.83	0.52/0.49	0.22/0.40	0.94/0.83	0.34/0.69
Temperature range 6	29.5	5.41	5.67	0.54/0.59	0.38/0.58	1.01/1.03	0.64/1.01
Temperature range 7	34.8	5.10	5.67	0.62/0.72	0.44/0.92	1.17/1.25	0.74/1.74
Temperature range 8	38.8	5.12	6.08	0.70/0.78	0.36/0.62	1.34/1.43	0.69/1.32