1 MIET 2406 Sustainable Thermal Systems Building Energy Assignment Due: 23.59pm Friday 9th June 2017 NOTE: (a) The assignment MUST be submitted through Blackboard before 11:59pm on the due day (b) A penalty may apply for late submission unless appropriate approval for extension is granted before the due date. (c) The assignment must be done in pairs. Define the role of each person in preparation of the report. Problem Description You are required to investigate and simulate the thermal energy of a one-storey test building. The basic test building is a rectangular single zone (8 m wide × 6 m long × 2.7 m high) with no interior partition and 12 m2 of window on the east and west walls. The building is of lightweight construction with characteristics as described in Table 1, but you will examine the effects of thermal mass using bluestone and the insulating properties of Hebal with properties shown below the table. Figure 1 Isometric view of southeast corner with windows on west and east wall Table 1 Wall Construction (light weight mass): Material (from Inside to Outside) Conductivity (W/m-K) Thickness (m) U (W/m2-K) R (m2-K/W) Density (kg/m3) Cp (J/kg-K) Int. Surf. Coeff. 0.121 Plasterboard 0.160 0.012 15.556 0.064 950 840 Fiberglass quilt 0.040 0.066 0.606 1.650 12 840 Wood siding 0.140 0.009 13.333 0.075 530 900 Ext. Surf. Coeff. 0.034 Overall, air to air 0.514 1.944 Bluestone 2.5W/m 0.25 2700 950 Hebal Panel 0.12W/m 0.25 520 1000 3m 2m y x z 6m 8m 2.7m Bldg. Origin (0,0,0)2 Table 2 Roof Construction (light weight mass): Element k (W/m-K) Thickness (m) U (W/m2-K) R (m2-K/W) Density (kg/m3) Cp (J/kg-K) Int. Surf. Coeff. 0.121 Plasterboard 0.160 0.010 1.60 0.625 950 840 Fiberglass quilt 0.040 0.118 0.606 1.650 12 840 Wood siding 0.140 0.019 7.368 0.136 530 900 Ext. Surf. Coeff. 0.034 Overall, air to air 0.318 3.147 Table 3 Floor Construction (light weight mass): Element k (W/m-K) Thickness (m) U (W/m2-K) R (m2-K/W) Density (kg/m3) Cp (J/kg-K) Int. Surf. Coeff. 0.121 C5 Concrete 1.73 0.1015 17.04 0.059 2243 837 Table 4 Window Property: (you will have to change to 1 pane and no airgap) Type Clear Number of panes 2 Panes thickness 0.006 m Air-gap thickness 0.0032 m Conductivity of glass 0.9 W/m-K Task: Using a numerical approach (i.e. Energy+), evaluate the cooling and heating load of the whole building for the whole of February and July in Melbourne: 1. Four different building scenarios: a. Whole building without windows (delete the fenestration objects in the supplied file) b. Whole building with windows on east and west wall c. Whole building with the east and west windows replace buy a window of the same area (12m2) on the North wall. d. Whole building with windows and internal heat load due to 4 people. 2. Two different windows a. Double glazed and b. Single glazed 3. Two different wall constructions a. Lightweight b. Heavy- replace wood with 25cm thick bluestone. c. Insulating – replace wood with 25cm Hebal block Present a report (one per team) investing the effect of the above variables. It should be in the form of graphs and tables and explanations of the main findings. Make sure you work as a team and estimate the percentage of work each person has done to complete the project and put that percentage into the report – make sure you sub-divide tasks. A file is supplied, which is your starting point. It is lightweight construction, with double glazed windows and no lights. Assessment based on understanding of the problem, presentation clarity, analysis and conclusions.