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The plan and elevation of a bungalow built in the 1970s are shown - Leaving Cert Construction Studies - Question 10 - 2019
Question 10
The plan and elevation of a bungalow built in the 1970s are shown. The wall B-B is south facing. The owners intend to carry out a deep retrofit upgrade of their hous... show full transcript
Worked Solution & Example Answer:The plan and elevation of a bungalow built in the 1970s are shown - Leaving Cert Construction Studies - Question 10 - 2019
Step 1
Using notes and freehand sketches, outline three design considerations necessary to achieve the EnerPHit Passive House design standard.
Answer
To achieve the EnerPHit Passive House design standard, consider the following design considerations:
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Thermal efficiency of the external envelope of the building: Upgrade insulation in the walls, roof, and floor to minimize heat loss. For example, increase wall insulation to achieve a U-value of less than 0.08 W/m²K.
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Appropriate ventilation using a heat recovery system: Install an efficient heat recovery ventilation system that minimizes heat loss while ensuring adequate fresh air supply. It should aim for a specific heat recovery efficiency.
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Airtightness of the building: Ensure all joints and seals are properly fitted to prevent air leaks. This could involve sealing around windows, doors, and other junctions to maintain desired airtightness.
Step 2
Discuss in detail, using notes and freehand sketches, how you would retrofit the given house to include each consideration you specified at 10(a) above.
Answer
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Thermal efficiency of the external envelope of the building:
- Increase insulation levels in the walls, roof, and floor (suggested U-value: < 0.08 W/m²K).
- Replace windows and doors with high-performance EnerPHit-standard units.
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Appropriate ventilation using a heat recovery system:
- Install a heat recovery ventilation system that connects to all living spaces, ensuring adequate air exchange while retaining heat.
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Airtightness of the building:
- Seal all joints in the building fabric to prevent air leakage.
- Consider a blower door test to measure actual airtightness and ensure it meets the EnerPHit standard.
Step 3
Discuss two advantages of retrofitting an existing house to meet the EnerPHit standard.
Answer
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Reduced heating costs: By improving the thermal efficiency of the home, residents can expect significant savings on energy bills due to less energy required for heating.
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Improved energy efficiency and comfort: Retrofitting enhances living conditions by reducing drafts and improving indoor air quality through efficient ventilation systems. This leads to a more comfortable living environment.