School of Engineering, Design and Built Environment
Unit 200471, Construction Technology 5, Autumn 2021
ASSIGNMENT 1-2 – Heat
(Marked out of 15 marks in total for the unit)
Before attempting this assignment, it is recommended:
• Read the learning materials modules (5-7) on the vUWS
• Watch the Paul Geier videos on UWS YouTube.
• Consult the Book: Szokolay, S.V. (2008), Introduction to Architectural Science: The Basis of Sustainable Design, Elsevier, Oxford – This is available as an E-Book through the WSU Library.
Where diagrams are required, they can be hand drawn or from reliable resources. All diagrams should be annotated by the student.
Heat
1. Explain, with annotated diagrams, the different effects of insulation and thermal mass on the heat flow through the external wall of a building. In which kind of climate do you recommend using thermal mass and why? (4 marks)
(Explaining effects of insulation on the heat flow through the external wall of a building.) 0.5 mark (suitable annotated diagram) 0.75 mark
(Explaining effects of thermal mass on the heat flow through the external wall of a building.) 0.5 mark (suitable annotated diagram) 0.75 mark
(In which kind of climate do you recommend using thermal mass?) 0.5 mark (why?) 1 mark
Explain the term Thermal Comfort. Describe four of the environmental and / or human related characteristics that can have an impact on thermal comfort of building occupants. (5 marks)
(Explaining the term Thermal Comfort) 1 mark
(Title of Each characteristic that has an impact on thermal comfort) 4x0.5 mark (Explaining each of those characteristic) 4x0.5 mark
Do a quick calculation of the thermal conductance (U value) across a cavity wall consisting of:
1. Outer skin 220mm brickwork (North facing, exposed aspect)
2. 20mm cavity
3. Inner skin of 10mm plasterboard
The necessary data can be found in module 5. Compare this with the worked example of an insulated brick veneer wall in the worked example. Show your working. (3 marks)
(Identifying and/or calculating R-value of the five wall layers) 1.5 mark
(Calculating R-value and U-value of the whole wall) 1.25 mark
(Correct use of units) 0.25 mark
Explain the use of a psychrometric chart? Who, in terms of the construction sector workforce, may use this chart? (hint: use the axis on the chart as guidance in your answer). (3 marks)
(Explaining use of psychrometric chart and its elements) 2 mark
(Mentioning the persons that use psychrometric chart) 1 mark