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10. (a) Using notes and freehand sketches as appropriate, discuss in detail the importance of any two of the following in the design of a Passive House: - building orientation: - thermal mass: - primary energy demand - Leaving Cert Construction Studies - Question 10 - 2013
Question 10
10. (a) Using notes and freehand sketches as appropriate, discuss in detail the importance of any two of the following in the design of a Passive House: - building ... show full transcript
Worked Solution & Example Answer:10. (a) Using notes and freehand sketches as appropriate, discuss in detail the importance of any two of the following in the design of a Passive House: - building orientation: - thermal mass: - primary energy demand - Leaving Cert Construction Studies - Question 10 - 2013
Step 1
Discuss the importance of building orientation
Answer
Building orientation plays a crucial role in maximizing energy efficiency in a Passive House. Proper orientation ensures that the structure makes use of natural sunlight and prevailing winds, reducing reliance on artificial heating and cooling systems. For instance, orienting the building’s long side towards the south allows for optimal sunlight exposure, which can significantly decrease energy demands during colder months. Furthermore, orientation can affect thermal comfort by reducing glare and overheating in the summer months.
Step 2
Discuss the importance of thermal mass
Answer
Thermal mass is essential in a Passive House as it helps in regulating indoor temperature by absorbing and storing heat energy. Materials with high thermal mass, such as concrete or stone, can mitigate temperature fluctuations, providing a stable indoor climate throughout the day and night. By absorbing heat during the day and releasing it at night, thermal mass reduces heating demands, thereby promoting energy efficiency and overall comfort.
Step 3
Draw a single line diagram indicating the preferred location for the MHRV unit
Answer
To represent the MHRV installation, create a single line diagram that includes the ducting layout from the MHRV unit to each room in the house. Ensure that the MHRV unit is centrally located to optimize air distribution and minimize duct length. Label each duct clearly to indicate whether it is an intake or exhaust, along with the airflow direction.
Step 4
Describe how a Mechanical Heat Recovery with Ventilation (MHRV) system works
Answer
An MHRV system functions by transferring heat from outgoing stale air to incoming fresh air. This process minimizes energy loss while maintaining indoor air quality. The system consists of two separate airflow paths: one for exhaust air and another for fresh air. As air is expelled from the space, it passes through a heat exchanger where it warms the incoming cool air, thus reducing heating energy requirements. This promoting efficient ventilation without compromising thermal comfort.
Step 5
Discuss two design considerations for MHRV unit placement
Answer
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Airflow Efficiency: The MHRV unit should be located in a central position to ensure equal distribution of fresh air throughout all rooms. Ensuring unobstructed airflow paths is crucial for maintaining system efficiency.
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Maintenance Access: It is essential to place the MHRV unit in an accessible location to facilitate regular maintenance. This will ensure the longevity and efficiency of the unit, minimizing disruptions to the indoor environment.