Development and Application of a ZigBee-Based Building Energy Monitoring and Control System

Table 2

Current and voltage data comparison between the ZBEMCS and a standard clamp meter.

	A: ZBEMCS		B: standard clamp meter		A−B
	Current (A)	Voltage (V)	Current (A)	Voltage (V)	Current (A)	Voltage (V)
Lamp	0.27	235.2	0.25	238	0.02	−2.8
	0.26	235.5	0.24	238.2	0.02	−2.7
	0.25	235.5	0.22	237.2	0.03	−1.7
	0.24	235.3	0.19	236.4	0.05	−1.1
	0.23	235	0.18	236.5	0.05	−1.5
	0.22	235	0.16	236.5	0.06	−1.5
	0.21	233.9	0.15	236.6	0.06	−2.7
	0.2	234	0.14	236.7	0.06	−2.7
Hair dryer	0.77	235.4	0.72	237.4	0.05	−2.0
	3.53	233.8	3.46	236.1	0.07	−2.3
	4.49	233.8	4.42	235.5	0.07	−1.7
Electric heater	2.82	234.5	2.75	236.3	0.07	−1.8
	4.71	233.2	4.65	235	0.06	−1.8
	7.5	231.7	7.45	233.4	0.05	−1.7
Average deviation					0.051	−2.0
Standard deviation					0.017	0.545