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