Page 208 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

186 Cha pte r F o u r

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for Thermal Comfort, Energy Efficiency, and Indoor Air Quality,” Journal of Green
Building, Spring, 2(2): 131–150.
Wark, K., C. F. Warner, and W. T. Davis (1998), Air Pollution, Its Origin and Control,
Addison Wesley Longman, Menlo Park, CA.
WMO (1998), The Scientific Assessment of Ozone Depletion, 1998, World Meteorological
Association’s Global Ozone Research and Monitoring Project, Geneva, Switzerland.
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Exercises
1. You are designing a new building in South Carolina where electricity costs about $0.085 per kWh
and natural gas costs about $5.32 per MMBtu. The average of the four orientations of the base design
uses about 12 kW of electricity and 130 MMBtu of natural gas each month for regulated uses.
A. Determine on an annual basis the BBP (baseline building performance).
B. You decide to implement some energy-saving programs for the regulated uses that reduce
these electrical uses by 30 percent and natural gas uses by 25 percent. You are not going to
use any renewable energy sources on-site. Determine the PDEM (proposed design energy
model) cost and the PBP (proposed building performance).
C. Determine your AECS (annual energy cost savings) and the available points for EA credit 1
for LEED 2009.
2. You are designing a new building in a state where electricity costs about $0.095 per kWh and
natural gas costs about $6.32 per MMBtu. The average of the four orientations of the base design
uses about 14 kW of electricity and 140 MMBtu of natural gas each month for regulated uses.
A. Determine on an annual basis the BBP (baseline building performance).
B. You decide to implement some energy-saving programs for the regulated uses that reduce
these electrical uses by 30 percent and natural gas uses by 25 percent. In addition, you would
like to use on-site renewable sources of electricity with photovoltaic cells for 2 kW of the
electricity. Determine the PDEM cost and the PBP.
C. Determine your AECS and the available points for EA credits 1 and 2 in LEED 2009.

3. Determine how much green power you need to purchase to get the LEED 2009 two points for
credit EAc6 for the new building in Exercise 1.
4. Energy modelers have determined that the average BBP for your new project in St. Louis
is about $1500 per month. Of this, 55 percent represents costs due to electrical usages, and the
remainder of the costs is from natural gas usage. The PDEM gives a value of $1200 per month
with 50 percent of the costs from electrical usages. All costs are based on the default energy costs
of 2003. Determine the LEED 2009 points available for EAc1 and the amount of green power that
must be purchased to obtain the two points for EAc6. Is this also eligible for RP points? Which
ones? (See Chap. 7.)

5. Energy modelers have determined that the average BBP for your new project in Portland
is about $1500 per month. Of this, 60 percent represents costs due to electrical usages, and the
remainder is from natural gas. The PDEM gives a value of $1200 per month with 50 percent of
the costs from electrical usages. All costs are based on the default energy costs of 2003. You are
planning to install photovoltaic cells at the site that would generate on average 2 kW of power for