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A wood burning stove, as shown in the sketch, is used to heat two independently controlled heating zones, one on each floor, in a two storey dwelling house - Leaving Cert Construction Studies - Question 8 - 2011
Question 8
A wood burning stove, as shown in the sketch, is used to heat two independently controlled heating zones, one on each floor, in a two storey dwelling house. Using no... show full transcript
Worked Solution & Example Answer:A wood burning stove, as shown in the sketch, is used to heat two independently controlled heating zones, one on each floor, in a two storey dwelling house - Leaving Cert Construction Studies - Question 8 - 2011
Step 1
Using notes and a single-line diagram, show a typical design layout for the pipework necessary to independently heat each zone.
Answer
The design layout involves two independently controlled heating zones, each served by a wood burning stove.
Diagram Details
- Pipework Layout:
- Start with the wood burning stove, which acts as the central heating source.
- Each heating zone will have its own pipe loop:
- Zone 1 (Ground Floor): A pipe loop going to three radiators (R1, R2, R3) with control valves at each.
- Zone 2 (First Floor): A second pipe loop leading to three more radiators (R4, R5, R6), again equipped with control valves.
- The control valves should be located on the return line to allow for efficient regulation.
Control Valves and Sizes
- Each radiator is to have:
- Hand wheel/thermostatic valves on flow o Lockshield valves on return o Air bleed valves on the radiators.
- Typical pipe sizes:
- 22 mm for the main flow and return.
- 15 mm on the upstands to radiators.
- 28 mm for expansion.
Step 2
Show a design layout for the pipework necessary to connect the solar collector to the existing system and outline the modifications required to the existing system to accommodate the solar collector.
Answer
To connect the solar collector to the existing heating system, updates to the pipework and modifications are essential.
Design Layout
- Solar Collector Connection:
- Position the solar collector on the roof, oriented in the direction of optimal sun exposure (facing South or within 15° East/West of South).
- Connect the solar collector to the hot water cylinder using pipes that direct the hot water collected to the existing system.
- Install a blending valve to ensure the domestic water system is protected from high temperatures.
Modifications Required
- Increased Water Capacity:
- Upgrade the hot water cylinder to 300 litres to accommodate increased demand.
- New Components:
- Install temperature sensors to monitor performance.
- Implement a cooling vessel and expansion vessel to regulate pressure in the system.
- Integrate an electronic control system for enhanced efficiency.
Step 3
Using notes and freehand sketches, show a preferred location for the solar collector and discuss in detail two factors that influenced your choice of location.
Answer
Preferred Location for Solar Collector
- Placement:
- Install the solar collector on the roof, optimally positioned to maximize sunlight exposure.
- Consider ensuring it is above tiles and free of shade.
Factors Influencing Location
- Orientation and Inclination:
- The collector should face South for maximized solar gain, typically at an angle of 30° to 45° for optimal efficiency.
- Ensuring no shading from buildings or trees that could obstruct sunlight.
- Structural Considerations:
- The roof should be structurally sound to support the weight of the solar collector.
- Accessibility for maintenance, allowing easy adjustment to angle when necessary.