Analysis and Research on Energy-Saving Reconstruction of Building Heating System

Table 2

Calculation of gas cost.

Parameter name	Parameter value	Unit
Days of heating period	150	d
Heating load	648.55	kW
Inside air calculating temperature for heating	18 [15]	°C
Outdoor mean air temperature during heating period	1.1 [15]	°C
Outdoor air temperature for heating calculating	-6.6 [15]	°C
Annual consumption of heat	6525.99 [16]	GJ
Calorific value of natural gas	38.6 [17]	MJ/m³
Thermal efficiency of boiler	0.9
Natural gas consumption	187790.09	m^3
Overall floorage	9970	m^2
Gas fee	60.28	Chinese Yuan/m^2