Designing and Optimizing Heat Storage of a Solar-Assisted Ground Source Heat Pump System in China

Table 4

(a) Cooling characteristics of the heat pump

(°C)	0		6		12		18
	Power	COP	Power	COP	Power	COP	Power	COP
(°C)
5	17.43	2.66	19.64	2.70	21.85	2.78	24.05	2.84
10	17.49	2.83	19.33	2.87	21.19	2.90	23.03	2.93
20	15.82	3.43	17.40	3.50	17.92	3.56	21.56	3.63
29	14.31	3.80	15.92	3.85	17.52	3.90	19.13	3.95
32	14.24	3.98	15.68	4.03	17.13	4.08	19.57	4.13
38	13.32	4.30	14.66	4.33	15.99	4.36	17.33	4.40

(b) Heating characteristics of the heat pump

(°C)	35		40		45		50
	Power	COP	Power	COP	Power	COP	Power	COP
(°C)
−4	18.72	2.52	18.22	2.80	17.72	3.08	17.21	3.36
0	22.37	2.71	21.77	3.00	21.17	3.29	20.57	3.58
4	26.02	2.90	25.32	3.20	24.63	3.50	23.93	3.80
10	30.27	3.37	29.46	3.69	28.66	4.00	27.85	4.32
20	39.22	4.24	38.17	4.60	37.12	4.96	36.07	4.32
29	43.71	4.82	42.55	5.20	41.39	4.58	40.23	4.96