1. Utility Automation of Offices
Ali Asghar, Muhammad Saeed Khan
University of Gujrat, Gujrat, Pakistan
Abstract
It is the necessity of time that every office of an organization should me automated for minimum electrical power utilization. This work presents the sensors relay control (SRC).of utility items of an office for minimization of power use in offices. The accuracy of the system was observed and results were measured.
Electrical power consumption, thermostat level change and change in efficiency of server were studied.
Results and Discussion
When staff enter in the office sensor the infrared rays form changes which it receive and sensor establish the an output signal at its terminal which switch on the relay and relay switch on the load. the process is continuously repeated till the power supply switch was kept turned on.
Fig.3. Implemented automation system
The cost and results of utility automation of offices are shown in Table I.
Table I Cost and profit calculations
Introduction
A combination infra red sensor and 3-phase relay system is built and utilized to control the utility of an office. Kyoung et al. presented the system recognizes the location of resident's in intelligent smart home services. The paper presented a location-recognition algorithm [5].
Utility Automation of Offices
An infrared sensor senses any change in the pattern of infrared rays. A relay is a switching device which works when it receive an electric signal. Relay is a switch that makes and breaks the circuit under the effect of input from another device or circuit. The whole system working block diagram is given in Fig.1.
Fig.1. Block diagram of automation system
3-phase power is supplied at the input side of the relay while relay activation signal is supplied by the sensor. The circuit and connections mad to realize this system are shown in Fig. 2.
Fig.2. Auto control system
Description
Total
KWh
OFF time/day
Saving (USD/ Year)
Tube lights 16
0.64 18
477
Fans 8
212
Air Conditioners 4
2.303 3
286
Total Saving
975
Cost and Recovery
Price of 4 $65/sensor
260
Price of 4 magnetic $20/relay 80
Total cost (US dollar)
340
Payback in years
0.35
Conclusion
The analysis show that a lot of power energy can be saved by application of SRC. The cost of conservation work was so small that it was recovered in half a year by the savings achieved. References
[5] K. N. Ha, K. C. Lee and S. Lee, “Development of PIR sensor based indoor location detection system for smart home”, Proceeding of International Conference SICE-ICASE, pp – 2167, Busan, 2006.