Page 209 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Ener gy and Atmospher e 187

on-site usage. 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.)
6. There are many options for bulbs in light fixtures. For instance, emergency exit lighting could
possibly use incandescent, fluorescent, or LED (light-emitting diode) bulbs. In this exercise, assume
that the three different types of lamps use 40, 10, and 5 W and have typical lamp lives of 0.7, 1.7,
and 80 years, respectively.
A. Calculate the energy usage for a single emergency exit lighting fixture with incandescent,
compact fluorescent, and LED emergency bulb over 10 years.
B. In your state, at current electrical rates, what are the electricity costs for 10 years?
C. Estimate the additional bulb replacement costs as appropriate (both material and labor),
and give the estimated 10-year life-cycle cost for these 3 types.
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7. You are building a 10,000 ft retail facility in Nebraska. You have opted to obtain some points for
EAc1 by the prescriptive methods and will not do the whole building energy simulation. However,
you would like to see what size solar power you would need to install on-site for EAc2. Based on
LEED 2009, determine the minimum average power generation required from on-site solar power
to obtain one point for EAc2. Determine the amount of green power you would need to purchase
from off-site sources to obtain the EAc6 credit, with and without installation of the minimum on-site
solar cell. Which, if any, RP points are available for these credits? (See Chap. 7.)
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8. You are building a 4600 ft pharmacy on Long Island. You will not do the whole building energy
simulation due to the small size of the facility. However, there is a green power provider in the area
that sells renewable energy certificates at 18.5 cents/kWh. Current electricity rates in the area are
17.3 cents/kWh. What is your annual cost premium to obtain EAc6, based on LEED 2009? Is this
also eligible for an RP point? (See Chap. 7.)
9. You are designing a commercial strip with 10 storefronts and offices above. Each store uses
a 5-ton packaged HVAC unit, and each office above needs a 2-ton split HVAC unit. The small
refrigerators and water coolers in the store back rooms all use less than 0.5 lb of refrigerant and
are exempt from this calculation. You have found manufacturers’ specifications for the package
units which list them as using 1.8 lb of refrigerant per ton of air conditioning for each unit and
HFC-410A for the refrigerant. The cut sheet for the split units lists 3.1 lb of HCFC-22 per ton of air
conditioning.
Calculate the equivalent annual life-cycle-based global warming potential (LCGWP ) and
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the equivalent annual life-cycle-based ozone depleting potential (LCODP ) for each unit type.
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Determine if LEED 2009 EAc4 is met.
10. You are designing a commercial office tower with 10 offices or stores on the first floor. Each of the
first-floor spaces needs a 2-ton split HVAC unit listed at 3.1 lb of HCFC-22 per ton of air conditioning.
The upper floors are all used for an engineering consulting firm, and they are cooled by a single 400-ton
ac
centrifugal chiller using HCFC-123, which lists 1.8 lb of refrigerant per ton of air conditioning.
Calculate the equivalent annual life-cycle-based global warming potential (LCGWP ) and
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the equivalent annual life-cycle-based ozone depleting potential (LCODP ) for each unit type.
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Determine if LEED 2009 EAc4 is met.
11. For a typical 10-year life HVAC&R unit, calculate the maximum allowable equipment
refrigerant charge (Rc ) per ton that a single unit may have, based on the default values for leakages
i ac
and losses in order to be compliant with LEED 2009 EAc4 for the following refrigerants:
A. HCFC-22
B. HCFC-123
C. HFC-134a