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NEW QUESTION # 119
A rectangular office building is located in an extremely humid climate and is shaded by very large adjacent buildings on all four sides. If the building owner wants to decrease the annual energy cost for operating the building, which of the following would be the best design approach?
Answer: D
Explanation:
The best design approach for the office building is D. Recover waste energy through exhaust air energy recovery systems. This is because:
* Installing glazing with a higher solar heat gain factor would increase the cooling load and energy consumption of the building, especially in an extremely humid climate where heat gain is high1.
* Installing photovoltaic panels on the sides of the building would generate electricity from solar radiation, but it would not reduce the cooling load or energy consumption of the building, unless the electricity is used to power a heat pump or other cooling device2.
* Increasing outdoor air intake quantities during summer months would provide more fresh air to dilute the indoor pollutants and improve the indoor air quality, but it would not reduce the cooling load or energy consumption of the building, unless it is combined with a ventilation system that recovers waste energy from the exhaust air stream34.
An exhaust air energy recovery system (ERV) is a type of mechanical ventilation that uses a heat exchanger to transfer heat between two streams of air: one that enters the building and one that exits. The ERV pre-cools and dehumidifies the incoming ventilation air by sending the rejected heat into the exhaust airstream to cool the condenser coil at a lower temperature. This reduces both the cooling load and energy consumption of the building, as well as improving its indoor humidity levels34. An ERV can also provide some fresh outdoor air to meet ASHRAE Standard 62 ventilation rates5.
Therefore, an ERV is a more efficient and effective design approach than glazing, photovoltaic panels, or increased outdoor air intake quantities for reducing the annual energy cost for operating an office building in an extremely humid climate and shaded by very large adjacent buildings on all four sides.
References: 1: LEED v4: Building Design + Construction Guide - U.S. Green Building Council 2: LEED AP BD+C Exam | U.S. Green Building Council 3: Energy Recovery Systems - Nortek Air Solutions 4: Energy Recovery Ventilators - Greenheck 5: Mechanical Ventilation Types: Exhaust, Supply, Balanced & Energy Recovery
NEW QUESTION # 120
An owner has insisted on using a non-native or non-adapted plant species on both the vegetated roof and ground level. What Sustainable Sites credit will this decision impact the most?
Answer: D
Explanation:
Using a non-native or non-adapted plant species on both the vegetated roof and ground level will impact the Sustainable Sites credit Site Development-Protect or Restore Habitat the most. This credit requires that at least 20% of the site area (excluding building footprint) or 5% of the site area (including building footprint) must be vegetated with native or adapted plants. Non-native or non-adapted plants do not qualify for this credit and may also have negative impacts on the local ecosystem and biodiversity. The other credits are not directly affected by the choice of plant species, although they may have other requirements related to vegetation, such as shading, reflectance, or lighting.References: LEED v4 BD+C Reference Guide, Sustainable Sites Category, SSc Site Development-Protect or Restore Habitat, page 648.
NEW QUESTION # 121
What percentage of all energy usage is attributable to buildings?
Answer: D
Explanation:
According to the U.S. Green Building Council (USGBC) and U.S. Department of Energy, buildings account for approximately 40% of total energy consumption in the United States.
* This includes electricity, heating, and cooling loads across residential, commercial, and industrial buildings.
* Buildings are the largest energy consumers, surpassing transportation and industry sectors.
* LEED emphasizes energy efficiency to help reduce this 40% energy demand.
Buildings account for 40% of all energy consumption, making Option C the correct answer.
(Source: Official LEED BD+C Reference Manual)
NEW QUESTION # 122
A facility manager cleaning highly reflective paving material is
Answer: B
Explanation:
The heat island effect is the phenomenon of urban areas having higher air temperatures than surrounding rural areas due to the absorption and emission of heat by human-made surfaces, such as buildings, roads, and pavements. The heat island effect can have negative impacts on the environment, human health, and energy consumption. One of the strategies to reduce the heat island effect is to use highly reflective paving materials that have a high solar reflectance index (SRI), which measures the ability of a surface to reflect solar radiation and stay cool. However, over time, the paving materials can accumulate dirt and dust, which can lower their reflectance and increase their heat absorption. Therefore, a facility manager cleaning highly reflective paving material is reducing the heat island effect by restoring the reflectance and cooling potential of the surface12.
NEW QUESTION # 123
Which of the following project types is required to consider the perimeter floor area instead of the regularly occupied floor area under the Indoor Environmental Quality Credit, Daylight calculations?
Answer: C
Explanation:
Healthcare projects are required to consider the perimeter floor area instead of the regularly occupied floor area under the Indoor Environmental Quality Credit, Daylight calculations. This is because healthcare projects have different daylighting needs and challenges than other project types, and the perimeter area is more likely to have access to natural light and views. The perimeter floor area is defined as the regularly occupied spaces within 15 feet (4.5 meters) of the exterior wall that meets the minimum glazing requirements. References:
* LEED v4 for Building Design and Construction, p. 6021
* LEED v4 for Building Design and Construction, p. 362
NEW QUESTION # 124
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