Experimental Study of a Novel Direct-Expansion Variable Frequency Finned Solar/Air-Assisted Heat Pump Water Heater

Table 3

Characteristics of sensors and measurement instruments.

Parameter	Range	Accuracy	Measuring apparatus
Temperature (°C)	−100 to 100	±0.2	T-type thermocouple
Pressure (MPa)	0–3.04	0.3%	Huba pressure sensor
Irradiance (W/m^2)	0–2000	2%	Pyranometer
Power (kW)	0–12	1.2%	YOKOGAWA power sensor WT230