Chapter 5: Discussions and Conclusion
5.4 Conclusion
The impact of the optimum design of a multistory double skin façade with a 35 cm cavity with a double glass layer inside and Low-E layer outside achieved a lower U- value compared with other tested variables. As a result, this type of glass achieved an apparent reduction in energy consumption and AC energy consumption. For the
electrical consumption, in August as the peak period, the drop for the studio was 30% for electricity consumption, and the AC energy consumption was 23 % (see Fig. 74, 77). For example, the consumption in August was 186 kW/m for the existing glass single glass, and the new energy consumption was 130.2 kW/m for the simulation of the selected optimum DSF façade with the 35 cm cavity. The AC energy consumption was 551 kWh dropped for 490 kWh. In the other one-bedroom unit, the reduction had a better
percentage because of the wider glass façades; the energy consumption in August was 32
%, the consumption was 380 kW/m reduced to 260 kW/m, and for the AC consumption was 948 kWh turned into 758.4 kWh, which means the reduction percentage is 20 %.
However, the reduction percentage in other months can reach 25% (see Fig. 75, 78).
However, for the two bedrooms in the peak time, the reduction in electricity was 35%; in August, the electricity consumption was 614 kW/m, reduced to 429.8 kW/m by applying the optimum DSF. In addition to the AC energy reduction was 25 % (see Fig. 76, 79), the AC energy consumption in the peak month was 1345 kWh, which was reduced to 1076 kWh.
118
The choices of glazing properties such as glazing area and U-value (thermal transmittance) of the glazing reduce the AC energy consumption and the energy
consumption for significant reduction and comfortable thermal performance. The above choices are very dependent on the climate. The option of DSF, which is optimum in a location with a hot environment, such as Abu Dhabi, will not work very well in an area with a cold climate because the simulation process showed an actual reduction in hot months in AC energy reduction and did not show an absolute decrease in the other cold months throughout the year. The indoor climate was compared by analyzing high and low inside temperatures. The set comfort temperature was from 21°C to 26°C for the total number of hours in a year with an operative temperature. This final result affects the end users in a direct way which reduces the cost of energy bills; for the developers, these results make an excellent advertisement as this DSF building in saving energy; in addition, this result is very challenging for the designer to have a modern, unique and new type of designs, and finally, this result is perfect for decision makers because the direct income back.
119 Further Studies
For further studies, the cost-benefits analysis and the economical façade can be helpful to decide the ability to use these façades and the cost and the saved percentage by years. In addition, those different cavities can be applied to save energy consumption by the same ratio with a broader cavity for easier maintenance and different design.
Therefore, other variables such as transmittance and daylighting will be recommended for further study to improve their energy thermal performance effect.
120
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