This report is based on the investigation and research on reducing electricity consumption of certain appliances and to improve energy usage at home. The demand for electricity in South Africa is increasing and it is exceeding electricity supply, research has shown that households contribute 15% to the countries total electricity consumption . Efficient energy usage is very critical; electricity can be used very inefficiently in households during peak load times. In order to tackle this problem the country is facing, this report will give a brief analysis on the usage of domestic electrical appliances and the energy they consume and also identifying the household service using a large amount of electricity so that the service can be modified to reduce the energy usage by 30%. Electricity is high in demand during the peak time loads of 5 pm – 10 pm, and so this research will also focus on efficient electricity usage and how usage can be avoided during peak time loads.
Home Energy Audit
Electrical appliances Power ratings (kW) Running hours of appliances Time in a 24-hour day the appliance is mostly used Total Energy Consumption (kWh)
Refrigerator 0.45 8 hours 00:00 - 00:00 3.60
Microwave 0.90 ½ hour 07:00 - 09:00
18:00 - 21:00 0.45
Geyser (125 L) 2.00 12 hours 00:00 - 00:00 24.0
Stove 2.15 2 hours 17:00 - 22:00 4.30
Iron 1.00 ½ hour 06:00 - 08:00 0.50
Television 0.10 12 hours 08:00 - 22:00 1.20
Electric Kettle 1.50 ½ hour 06:00 - 20:00 0.75
Washing Machine 0.50 2 hour 07:00 - 10:00 1.00
Light Bulbs (5 bulbs) 0.020 each
0.020 x 5 = 0.10 8 hours 05:00 - 07:00
18:00 - 23:00 0.80
Cell phone Charger 0.010 1 hour 08:00 - 21:00 0.010
Electrical appliances in my home are the television, microwave, washing machine, refrigerator, light bulbs (household lighting), cell-phone charger, stove, geyser, iron and
kettle. These appliances differ in their frequency of daily usage.
Table 1: The power ratings and the average hours and time within a 24-hour day the appliances are used
The load profile gives the power consumption in day of all the appliances combined depending on the time each appliance is used. The load profile below (Figure 1) shows how much power is consumed on a daily basis, from the graph it can be concluded that electricity is required mostly during the night; Eskom peak time (17:00-22:00).
Figure 1: Power consumption of all electrical appliances combined in 24-hours
From (Table 1) it is determined that the geyser consumes a large amount of power in 24 hours than any other appliance. It works throughout the day and it does not have a specific time of use. The geyser is used to obtain hot water which is mainly used for bathing. In this case bathing has been identified as household service using a large amount of electricity.
The geyser has a power rating of 2kW, it switches on and off to heat the water if the temperature drops and therefore it approximately works for 12...