Research Article
Study on the Optimizing Operation of Exhaust Air Heat Recovery and Solar Energy Combined Thermal Compensation System for Ground-Coupled Heat Pump
Table 2
The similar days group subdivision based on 24 solar terms of ancient China.
| | Solar term | Sequence of similar days group | Date | Number of days | Sequence number of days () | Solar celestial longitude |
| | Slight cold (23rd solar term) | XH-1 | Jan. 6~Jan. 10 | 5 | 3~7 | 285–290 | | XH-2 | Jan. 11~Jan. 15 | 5 | 8~12 | 290–295 | | XH-3 | Jan. 16~Jan. 20 | 5 | 13~17 | 295–300 |
| | Great cold (24th solar term) | DH-1 | Jan. 21~Jan. 25 | 5 | 18~22 | 300–305 | | DH-2 | Jan. 26~Jan. 30 | 5 | 23~27 | 305–310 | | DH-3 | Jan. 31~Feb. 3 | 4 | 28~31 | 310–315 |
| | Spring begins (1st solar term) | LC-1 | Feb. 4~Feb. 8 | 5 | 32~36 | 315–320 | | LC-2 | Feb. 9~Feb. 13 | 5 | 37~41 | 320–325 | | LC-3 | Feb. 14~ Feb. 18 | 5 | 42~46 | 325–330 |
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