Experimental Study on Productivity Performance of Household Combined Thermal Power and Biogas System in Northwest China

Table 1

Types and technical parameters of the measuring instruments.

Measured parameters	Measuring instruments	Technical parameters
Solar radiation on the collector face of solar water heater and PV array	TBQ-2 Pyranometer (Jinzhou Sunshine Technology, Jinzhou, Liaoning)	Range: 0–2,000 Wm^−2; Sensitivity: 8.963 μV = Wm^−2; Precision: 2%
Output voltage of PV array	DC voltmeter (Chujing Electric, Wenzhou, Zhejiang)	Range: 0–50 V; Precision: 0.5%
Output current of PV array	DC ammeter (Chujing Electric, Wenzhou, Zhejiang)	Range: 0–50 A; Precision: 0.5%
Inlet water temperature for space heating; Outlet water temperature for space heating; Inlet water temperature for digester heating; Outlet water temperature for digester heating; Ambient temperature	pt100 temperature sensor (Beijing Sailing Technology, Beijing)	Range: −50°C to 100°C; Precision: -0.10°C
Flow rate for space heating	LWGY-20 turbine flowmeter (Shanghai Huaman Industrial, Shanghai)	Range: 0.7–7.0 m^3 = h; Precision: -0.45%
Flow rate for digester heating	LWGY-15 turbine flowmeter (Shanghai Huaman Industrial, Shanghai)	Range: 0.4–4.0 m^3 = h; Precision: -0.45%
Quantity of daily consumed coal	Platform balance (Shanghai Shuoheng Electronic Technology, Shanghai)	Minimum scale: 0.2 kg
Daily biogas production	G16 gas meter (Zhejiang Xinlong Instrument, Yongkang, Zhijiang)	Precision: -1.5%
Biogas contents	Gas600 portable biogas analysis (Geotech Instruments, Leamington, UK)	Precision: -2%
Electricity consumed by pumps	Electric energy meter (Wenzhou Libajia Technology, Wenzhou, Zhejiang)	Minimum scale: 0.1 kW·h