Question

An office has air-conditioning system with a power rating of 2 hp (1.49 kw), 4 fluorescent lamps, each consuming 80 W of electricity. The lights in the office are kept on for 12 hours a day and air- conditioning system are kept on for 8 hours, both operate for 250 days a year. For a unit electricity cost of 12 pesos per kWh, determine the annual energy cost for this office.

Answer 1

To determine the annual energy cost for an office's lighting and air conditioning, the total energy consumption is calculated and multiplied by the cost per unit of electricity. The annual cost for both lighting and air conditioning is found to be 47640 pesos.

Step-by-step explanation:

To determine the annual energy cost for the office's lighting and air conditioning, we need to calculate the energy consumption of each and then apply the unit cost.

For the fluorescent lamps (320W total), the daily energy consumption is:

• 320W x 12 hours/day = 3840Wh/day = 3.84 kWh/day.

For the air conditioning system (1.49kW), the daily energy consumption is:

• 1.49kW x 8 hours/day = 11.92 kWh/day.

Annual energy consumption for both is:

• (3.84 kWh/day + 11.92 kWh/day) x 250 days/year = 3970 kWh/year.

Now, the annual energy cost at 12 pesos per kWh is:

• 3970 kWh/year x 12 pesos/kWh = 47640 pesos/year.