Study on Storage Conditions and Suitability Zoning of Shallow Floor Energy in Nanchang City

Table 4

Evaluation table of factors affecting the suitability of the ground source heat pump.

Element indicators	Grading level	Assignment of the value
Aquifer effluent capacity (m^3/d)	<10	1
	10~100	3
	100~1000	5
	1000~5000	7
	≥5000	9
Effective aquifer thickness (m)	<10	1
	10~20	3
	20~40	5
	40~60	7
	≥60	9
Single-well recharge capacity of the aquifer (m^3/d)	<50	1
	50~500	3
	500~1000	5
	1000~2000	7
	≥2000	9
Groundwater depth (m)	<5, 100~200	1
	5~10, 80~100	3
	10~15, 50~80	5
	15~20, 30~50	7
	20~30	9
Permeability coefficient of formation (m/d)	<5	1
	5~10	3
	10~20	5
	20~50	7
	≥50	9
Overexploitation of groundwater	Groundwater volume is abundant	9
	The groundwater volume is average	5
	Overdraft	1
Underground water quality	Class I water	9
	Class II water	7
	Class III water	5
	Class IV water	3
	Class V water	1
Groundwater scale degree	Very few	9
	Less often	7
	More than that	5
	A lot of it	1