This paper attempts to resolve the reported contradiction in the literature about the characteristics of high-performance/cost-effective fenestration of residential buildings, particularly in hot climates. The considered issues are the window glazing property (ten commercial glazing types), facade orientation (four main orientations), window-to-wall ratio (WWR) (0.2–0.8), and solar shading overhangs and side-fins (nine shading conditions). The results of the simulated runs reveal that the glazing quality has a superior effect over the other fenestration parameters and controls their effect on the energy consumption of residential buildings. Thus, using low-performance windows on buildings yields larger effects of WWR, facade orientation, and solar shading than high-performance windows. As the WWR increases from 0.2 to 0.8, the building energy consumption using the low-performance window increases 6.46 times than that using the high-performance window. The best facade orientation is changed from north to south according to the glazing properties. In addition, the solar shading need is correlated as a function of a window-glazing property and WWR. The cost analysis shows that the high-performance windows without solar shading are cost-effective as they have the largest net present cost compared to low-performance windows with or without solar shading. Accordingly, replacing low-performance windows with high-performance ones, in an existing residential building, saves about 12.7 MWh of electricity and 11.05 tons of CO2 annually.
. [J]. Frontiers in Energy, 2022, 16(4): 629-650.
Ali ALAJMI, Hosny ABOU-ZIYAN, Hamad H. Al-MUTAIRI. Reassessment of fenestration characteristics for residential buildings in hot climates: energy and economic analysis. Front. Energy, 2022, 16(4): 629-650.
(c) Without shading for W1 and full shading of W10
?East
229.5
465.1
660.9
848.0
71.7
72.7
68.8
66.2
69.9
2.9 (4.2)
?West
240.0
469.5
663.3
846.0
75.0
73.4
69.1
66.1
70.9
4.0 (5.7)
?North
169.5
337.9
477.9
602.4
53.0
52.8
49.8
47.1
50.7
2.8 (5.5)
?South
140.8
300.4
443.2
581.1
44.0
46.9
46.2
45.4
45.6
1.3 (2.7)
Tab.13
Window luminance/(cd·m−2)
CF
Cash flow/USD
Annual electrical energy consumed by the room using W10/kWh
Annual electrical energy consumed by the room using window W1–W9/kWh
GC
Glazing cost/USD
GCD
Difference between window GC and window 10 GC/USD
Reference point index
Window shade index
Illuminance setpoint/lux
n
Number of years
NPVws
Net presen t value for windows with solar shading/USD
NPVwt
Net present value for windows without solar shading/USD
PC
Production cost of electrical energy/(0.126 USD·kWh−1)
PV
Present value/USD
r
Discount rate/1.5%
Window background luminance/(cd·m−2)
SSC
Solar shading cost/(USD·m−2)
SPPws
Simple payback period with solar shading/a
SPPwt
Simple payback period without solar shading/a
U
Overall heat transfer coefficient of windows/(W·m−2·K−1)
WFP
Window facade parameter
Area-weighted average reflectance of zone interior surfaces
Solid angle subtended by the window/steradians
Modified solid angle subtended by the window/steradians
Abbreviations
ACH
Air change
EUI
Energy use intensity
GA
Genetic algorithm
GCC
Gulf council countries
IDF
Input definition file
LT
Light transmission
NZEB
Net zero energy building
PMV
Predicted mean vote thermal occupant’s comfort index
SHGC
Solar heat gain coefficient
STD
Standard deviation
TMY
Typical meteorological year
W#
Window number
WWR
Window-to-wall ratio
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