Study on the Optimizing Operation of Exhaust Air Heat Recovery and Solar Energy Combined Thermal Compensation System for Ground-Coupled Heat Pump

Table 4

Predicted next day’s maximum solar irradiance in Beijing based on K_t in XH-2 similar days group.

Solar term	Sequence of similar days group	Date	Weather forecast	Kt value range	Kt value range in similar days group	Global solar irradiance correction gactor	The predicted maximal hourly total solar irradiance of next day; (w/m^2)	The measured maximal hourly total solar irradiance (w/m^2)
Slight cold (23rd solar term)	XH-2	Jan. 11	Sunny (fine air quantity)	0.74~1	KT5	0.89	715.56	753
	XH-2	Jan. 12	Haze (medium pollution)	0.5~0.74	KT4	0.73	511.73	625
	XH-2	Jan. 13	Haze (medium pollution) transform to light snow	0.5~0.74	KT4	0.64	448.64	507
	XH-2	Jan. 14	Fog transform to haze (heavy pollution)	0~0.15	KT1	0.62	34.87	37
	XH-2	Jan. 15	Haze (severe pollution) Transform to cloudy	0.28~0.5	KT3	0.66	199.42	226
MAPE							18.26%