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10. (a) Using notes and freehand sketches, discuss in detail the importance of any two of the following in the design of a Passive House: • airtight building envelope • space heating demand • indoor air quality - Leaving Cert Construction Studies - Question 10 - 2015
Question 10
10. (a) Using notes and freehand sketches, discuss in detail the importance of any two of the following in the design of a Passive House: • airtight building envelo... show full transcript
Worked Solution & Example Answer:10. (a) Using notes and freehand sketches, discuss in detail the importance of any two of the following in the design of a Passive House: • airtight building envelope • space heating demand • indoor air quality - Leaving Cert Construction Studies - Question 10 - 2015
Step 1
Discuss in detail the importance of airtight building envelope
Answer
The airtight building envelope is crucial in a Passive House as it minimizes air leakage and unwanted heat loss. This ensures that the indoor environment remains stable and energy-efficient. An airtight envelope prevents drafts and enhances the effectiveness of the insulation, allowing for consistent temperature regulation throughout the building. Key components like airtight membranes and efficient sealing at junctions reinforce this feature, making the overall system function optimally.
Step 2
Discuss in detail the importance of space heating demand
Answer
Space heating demand in a Passive House refers to the energy required to maintain a comfortable indoor temperature (around 20°C). Low heating demand is essential as it directly affects energy consumption and the efficiency of the heating system. By utilizing passive solar gain, high insulation values, and airtight construction, the energy requirement can be kept as low as 15 kWh/m² per year, significantly reducing reliance on conventional heating.
Step 3
Discuss the importance of thermal mass in the design of a Passive House
Answer
Thermal mass plays a vital role in the design of a Passive House by absorbing and storing heat from the sun during the day and releasing it during the night. Materials such as concrete, which possess high thermal mass, stabilize temperature fluctuations, ensuring comfort throughout the day. This property helps to prevent overheating and maintains a consistent internal climate, reducing the demand on heating and cooling systems.
Step 4
Discuss the function of carefully designed solar shading for the Passive House shown
Answer
Carefully designed solar shading is essential in a Passive House as it controls the amount of solar heat gain. By utilizing features like overhangs and adjustable shading devices, it allows direct sunlight in during winter, maximizing solar gain while blocking excessive heat in summer. This helps reduce the cooling load and enhances indoor comfort. Additionally, the design should ensure that the lighting remains effective without compromising energy efficiency.