Consider a 80,000-ft2 two-story building. A 60,000-cfm AHU services the building. The building is occupied 50 hours per week. The fuel cost is $5.00 per 106 Btu and electricity cost is $0.09 per kWh. Determine the energy and cost savings for the following ECOs for three locations: Denver, Colorado; Chicago, Illinois; and Miami, Florida.

a. Reset the hot deck temperature: 3°F in summer and 4°F in winter. Assume 50 percent of airflow is in the hot deck.

b. Reset the cold deck temperature: 2.5 Btu/lb if enthalpy. Assume 50 percent of airflow is in the cold deck.

c. Reduce minimum outdoor air: from 25 percent to the minimum required. Assume 20 cfm/person and 300 people in the building. Average indoor temperature is 70°F.

d. Low-leakage dampers: reduce damper leakage from 10 percent to 1 percent.

e. Install a dry-bulb temperature economizer or an enthalpy economizer.