Sustainable Energy in Building

Sustainable Energy in Building 1
SUSTAINABLE ENERGY IN BUILDING
Student’s Name
Course
Professor’s Name
Institutional Affiliation
City
Date

Sustainable Energy in Building 2
General Assumptions
Library occupancy is based on the net floor area and each person occupies 10 square metres
(MacKenzie, Nichols, Royle, Pollock, Bailey, and Hines 2017). Air conditioning design for the
Proposed University of Wollongong Library is based on the heating load requirements which is
dependent of several factors such as the interior and exterior temperatures, Building materials,
the area of walls, floors, windows, etc. Different areas in the library require different design
considerations. For instance, the air changes per hour for the study area, lounge, and offices are
taken as 4, while that for toilets is taken as 10 (Brochard, Slutsky, and Pesenti 2017).
a) Heating Load Calculations
Library occupancy
This is based on the total floor area.
Floor Total Occupiable area
(Sq.m)
Ground floor 3000
First floor 3482
Second floor 2800
Total 9282
Number of people= 9282 Sq . m
10 Sq . m
¿ 928.2( Approximately 929 people)
175 Watts of heating load per person in the library is assumed (Gang, Wang, Shan, and
Gao 2015).
Hence, the total heating load due to people;
¿ 92 9 ×175 Watts
¿ 162,575 Watts(163 kW )

Sustainable Energy in Building 3
Table 1: Values for thermal conductivity for different materials (Al-Homoud, 2005)
Material Thermal conductivity (W/mK)
Windows/Glass
6mm Double clear glass 0.96
5mm air gap 0.68
Roof
Roof metal deck 0.98
50mm Insulation 0.35
Ceiling
Fiberglass suspended ceiling 0.49
Exterior Wall
15 mm Gypsum plaster 0.71
110mm Double brick 0.8
50mm air gap 0.68
Determination of U-Values (Siviour, 2018);
U Value= 1
R1 + 1
R 2 +... 1
R 0
Where R0=Air resistivity.
Sample Calculation
Total area for glass=3,000 sq. m
Resistivity= Glass Tickness
Thermal Conductance
Resistivity=0.006
0.96
Resistivity=0.00625
U Value= 1
0.00625 + 1
0.68
U Value=161 W
Sq . m K