Research Article
Study on Storage Conditions and Suitability Zoning of Shallow Floor Energy in Nanchang City
Table 5
Evaluation table for suitability factors of the ground source heat pump.
| Factor index | Classification | Assignment |
| Quaternary thickness (m) | 20~40 | 5 | 40~70, 0~20 | 7 | >70 | 9 |
| Groundwater depth (m) | <5 | 1 | 5~10 | 3 | 10~15 | 5 | 15~20 | 7 | ≥20 | 9 |
| Groundwater runoff conditions | Very good | 9 | Good | 7 | Commonly | 5 | Difference | 3 |
| Groundwater quality | Class I and II water | 9 | Class III water | 6 | Class IV and V water | 3 |
| Drilling conditions | Good | 9 | Commonly | 5 | Difference | 1 |
| Thermal conductivity of formation (W/(m·°C)) | <1.6 | 3 | 1.6~1.8 | 5 | 1.8~2.0 | 7 | ≥2.0 | 9 |
| Mean specific heat (kJ/(kg·°C)) | <0.8 | 1 | 0.8~1.0 | 3 | 1.0~1.2 | 5 | 1.2~1.4 | 7 | ≥1.4 | 9 |
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