Question 1

The required air leakage rate from a new building is in the range of? A)Half to one air change per hour B)1 to 10 m³/h m² at 50 Pa internal air pressure C)0.25 air changes per hour D)10 to 100 m³/h m² at 25 Pa internal air pressure E)Must be zero

Accepted Answer

The required air leakage rate from a new building is typically measured in cubic meters per hour per square meter of envelope area at a specified pressure difference across the envelope (usually 50 Pa). In new construction, the typical air leakage rate requirement is 1 to 10 m3/hm2 at 50 Pa internal air pressure. Option B is the only one that includes this range.

Question 2

Which of these is not a correct multiple? A)MWh = 1000 W x 1 h B)kJ = 10³ J C)1 GJ = 10⁶ kJ D)1 mm = 10^-3 m E)1 GW = 1000 MW

Accepted Answer

A) 1 MWh is equal to 1,000 kWh (kilowatt-hours), not 1,000 W x 1 h. The correct conversion should involve kilowatts, as 1 kWh = 1,000 W x 1 h.

Question 3

Which is not correct for CO₂ greenhouse gas? A)Continuously converted back into O₂ by photosynthesis B)Produced by ruminating animals C)Easily reversed to solid carbon plus oxygen gas into the atmosphere D)It is burnt carbon from fuel combined with atmospheric oxygen E)Combusted hydrocarbons are not the sole source of greenhouse gases

Accepted Answer

CO₂ is not continuously converted back into O₂ by photosynthesis. Rather, it is produced as a result of various natural and human activities, such as burning of fossil fuels, deforestation, and industrial processes. Also, it is not easily reversed to solid carbon plus oxygen gas into the atmosphere because it is a stable molecule and does not readily react with other molecules.

Question 4

Which is Degree Day load factor not relevant to?&#10;A)Ratio of degree days from meteorological data&#10;B)Calculation of heating system kW load for design&#10;C)Minimum outside air temperature for design&#10;D)Seasonal weather variability&#10;E)Maximum possible Degree Days for the locality

Accepted Answer

The answer of Which is Degree Day load factor not...

Question 5

Economic thickness of thermal insulation is which of these?&#10;A)The optimum balance of capital cost of the insulation versus the value of energy transferred.&#10;B)As much as the building owner can afford&#10;C)No limit to the thickness for keeping warm in a cold climate&#10;D)Impossible to evaluate&#10;E)Anything that is allowed in the regulations governing building

Accepted Answer

Economic thickness of thermal insulation refers to finding the optimal thickness of insulation where the capital cost of installing the insulation is balanced with the value of energy saved through reduced heat transfer. It is a practical and cost-effective approach to insulation, rather than simply adding as much insulation as possible.

Question 6

Which of these is included in the annual financial accounts for energy-saving projects?&#10;A)Total cost of maintaining the building each year&#10;B)Balance sheet for the building owners business&#10;C)Balance sheet for the energy saving investment&#10;D)Cash flow analysis for the duration of the energy-saving payback years&#10;E)Total labour hours for all maintenance work in the building

Accepted Answer

Cash flow analysis is included in the annual financial accounts for energy-saving projects because it provides information on the project's financial performance, including the project's costs and benefits.

Question 7

Which of these describes low energy buildings?&#10;A)Always uncomfortable for occupants&#10;B)Design predictions of energy use mean nothing to the user of the building&#10;C)Must comply with an energy rating mandatory standard upon construction&#10;D)Cannot maintain low energy use after three years of use&#10;E)Cannot have large areas of glazing

Accepted Answer

Low energy buildings must comply with an energy rating mandatory standard upon construction, meaning they are designed to have lower energy consumption and emissions than traditional buildings.

Question 8

What does sustainability mean for low energy buildings?&#10;A)All windows have low emissivity glass&#10;B)Brick, steel and concrete walls save more energy consumption while in use than they cost to produce and construct&#10;C)Aluminium window frames are not used in this building&#10;D)Double glazed windows always used in cold climates&#10;E)All thermal insulation, glass, aluminium, steel, timber and concrete in this building were harvested from renewable resources

Accepted Answer

Low energy buildings aim to reduce energy consumption during use, but it is also important to consider the environmental impact of the materials used in construction. Brick, steel, and concrete walls have a higher "embodied energy" (energy required to produce and transport the materials) compared to other materials, but their durability and insulation properties make them a sustainable choice in the long run.

Question 9

What is used in the USA to rate a building?&#10;A)Leadership in Energy and Environmental Design&#10;B)Low Energy Environmental Design&#10;C)Low Electrical Energy Demand&#10;D)Leading Electrical Energy Demonstration&#10;E)Leader in Energy Environment and Design

Accepted Answer

The Leadership in Energy and Environmental Design (LEED) is a rating system used in the USA to measure the environmental sustainability and energy efficiency of buildings. LEED certification is a recognition that a building meets stringent environmental standards and is designed for sustainability.

Question 10

Which of these has the correct units? A)1 MJ = 10³ kW/s B)1 Joule = 1 Watt/s C)10³ J = 1 kW/s D)1 Watt = 10³ Joule/s E)1 Joule = 1 Newton x 1 metre

Accepted Answer

E) 1 Joule = 1 Newton x 1 metre is correct because a joule is the unit of work or energy in the International System of Units (SI), and it is defined as the amount of work done when a force of one newton is applied over a displacement of one metre.

Deck 4: Energy Economics