Question 1:There are 20 lights and ballasts that consume 440W (400W high intensity discharge (HID) bulbs with a ballast that consumes 40W).The cost of electricity is $0.10/kWh and $7/kW-month demand and the lights are on 24 hours a day, seven days a week.How much electricity do the HID lights and ballasts consume monthly?What is the estimated cost of operating the 20 HID lights and ballast monthly?

Question 2:For the same lights in Question 1, you are able to install a timer of the lights and instead of operating 24 hours a day, they operate 8 hours a day.How much electricity do the HID lights and ballast consume monthly?What is the new estimated cost of operating the 20 HID lights and ballasts monthly?

Question 3:For the same lights in question 1, you are able to install the same timer as Question 6, reducing daily operating hours from 24 hours to 8 hours.However, you are also able to replace the 400W lights and 40W ballasts with LED luminaires that consume 150W of power each.How much electricity do the LED luminaires consume monthly?What is the new estimated cost of operating the 20 LED luminaires monthly?

Question 4:An energy efficiency project is expected to save 10,000 kWh annually and 2 kW of demand. The cost of electricity is $0.10/kWh and $7/kW-month of demand.The energy efficiency project is expected to cost $5000 to implement and will last for 15 years.What is the simple payback of the project?

Question 5:For the same project in Question 4, what is the net present value of project at a 10% discount rate (see page 168 of your textbook for compound interest factors).Be sure to include a basic cash flow diagram.

Question 6:A 20kW rated motor has an average loading of 75% of rated power and has an efficiency of 80%.The motor has a peak loading of 100% of rated power.The motor operates 1000 hours a year. The cost of electricity is $0.10/kWh and $7/kW-month of demand.Assume the motor operates at periods of peak demand at the facility (i.e. the motor power impacts the billing demand).An energy efficiency upgrade reduces the average power consumed to an average loading of 50% of rated power and reduces the peak power to 75% of rated power, but increases the operating hours to 1500 hours per year.There is no change in the efficiency of the motor after the upgrade.The cost of the energy efficiency project is $10,000.What is the annual electricity cost of running the motor before and after the energy efficiency upgrade?What is the simple payback of the project?

Question 7:Research some of the most common new construction or green building labels (ex. LEED, ENERGY STAR New Home).Compare and contrast these common labels.Which label or labels do you think is most helpful in encouraging builders to adopt energy efficient building practices.Defend your assertion.

Question 8:A property company who will also operate the building is deciding whether to build a standard efficiency office building or a high efficiency office building.The office building is 8,000 m2 and its energy is supplied 100% by electricity.The standard efficiency office tower will consume approximately 140 kWh / m2 /y.The high efficiency office tower will consume approximately 100 kWh / m2 /y. The incremental cost (i.e. the cost between the standard efficiency and high efficiency office tower) is $40 per m2 and the building systems are expected to last 25 years.

• 8a. What is the estimated annual energy cost savings per year for the high efficiency building compared to the standard efficiency building?
• 8b. Does it make sense for the property company to invest in the high efficiency office building?Defend your answer.