Research on mathematical quantitative model of the incremental cost and income of green small towns based on the whole life cycle

Fig. 1

Incremental cost-benefit evaluation of Energy Saving and Solar Energy Utilisation of Ningxia Project

	FertilityΔαRatio Δα	FertilityΔα1Ratio Δα1	FertilityΔα2Ratio Δα2
Building envelope energy saving	9.71	3.81	5.88
Solar hot water system	3.50	1.23	2.27
Energy-saving and solar energy utilisation technology	7.57	2.92	4.65

Cost-earnings evaluation

	FertilityΔαRatio Δα	FertilityΔα1Ratio Δα1	FertilityΔαRatio Δα2
Water system	2.75	2.71	0.04
Rainwater system	4.49	4.43	0.06
Water resources utilisation	3.46	3.40	0.05

Incremental cost and incremental income

	Incremental cost	Incremental income	Incremental and direct economic gains	Incremental environment and social benefits
Reclaimed water system	3.17 × 103	8.73 × 103	8.6 × 103	1.3 × 102
Rainwater system	2.09 × 103	9.38 × 103	9.25 × 103	1.3 × 102
Water resources utilisation	5.26 × 104	1.82 × 104	1.79 × 104	2.6 × 102

Incremental cost and income of energy saving and solar energy utilisation technology of Ningxia Project (Unit: 10,000 yuan)

	Incremental cost	Incremental income	Incremental and direct economic gains	Incremental environment and social benefits
Energy saving of enclosure structure	2.43 × 103	2.36 × 104	9.25 × 103	1.43 × 104
Solar photothermal system	1.27 × 103	4.44 × 103	1.56 × 103	2.88 × 103
Energy-saving and solar energy utilisation technology	3.70 × 103	2.80 × 104	1.08 × 104	1.72 × 104

Index weight table of evaluation standards for green small towns

	Weight
Ecological planning and construction	0.39
Industrial planning	0.26
Planning and construction of small towns	0.27
Heritage protection	0.10
Architectural design and site design	0.39
Energy planning and utilisation	0.20
Water saving and water resources utilisation	0.14
Solid waste treatment and resource utilisation	0.13
Management and publicity	0.12