This assignment focuses on the analysis of Renewable Energy. There is also a description of Mechanisms for heat transfer through a window. So, briefly indicate how the heat energy is transferred through a window in each case.
Renewable Energy Assignment – Mechanisms for heat transfer through a window
Tutor-marked assignment (TMA 01)
TMA 01
Study Guide 2 explored U-values and how heat energy s transferred through windows. After your study of Chapter 2 of Renewable Energy, guided by Study Guide 2, you should be able to explain heat energy flow through the materials in buildings, especially windows.
· a. State the three main mechanisms for heat transfer through a window, and briefly indicate how the heat energy is transferred through a window in each case.
Renewable Energy Assignment – Mechanisms for heat transfer through a window
3 marks
b.Original double-glazing designs simply featured an air gap between the two panes of glass. Since 2013 the minimum acceptable UK Windows Energy Rating for new and replacement windows (on a scale of A to G, with A being the best) is C. Argon filled units with a gap between 12 and 16 mm are able to achieve this. However, this is a potential problem for historic buildings.
Explain, with reference to the gap dimension and the properties of the contents of the gap, how glazing units with acceptable UK window regulation U-values may be achieved.
2 marks
·
o i.In a house with a 3.0 m² single glazed window, what is the total rate of heat loss on a day where the outdoor and indoor temperatures are 3°C and 18°C respectively? (Data may be assumed to have been supplied to 2 significant figures (SFs)).
1 mark
o ii.Assuming the temperature difference remained the same throughout a 24-hour period, what would be the total heat loss in kWh over the day?
1 mark
o iii.What would the heat loss be over a 24-hour period if the single glazed window were replaced with a triple glazed window?
1 mark
(Total for Question 1 is 8 marks)
· a. Briefly define, in your own words, the meaning of the phrases “winter design temperature” and “heat loss coefficient (HLC)”.
Renewable Energy Assignment – Mechanisms for heat transfer through a window
o i.In a house with a 3.0 m² single glazed window, what is the total rate of heat loss on a day where the outdoor and indoor temperatures are 3°C and 18°C respectively? (Data may be assumed to have been supplied to 2 significant figures (SFs)).
1 mark
o ii.Assuming the temperature difference remained the same throughout a 24-hour period, what would be the total heat loss in kWh over the day?
1 mark
o iii.What would the heat loss be over a 24-hour period if the single glazed window were replaced with a triple glazed window?
1 mark
(Total for Question 1 is 8 marks)
· a. Briefly define, in your own words, the meaning of the phrases “winter design temperature” and “heat loss coefficient (HLC)”.
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