Dissertations for Intelligent Buildings Design and Automation (IBDAA)
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Browsing Dissertations for Intelligent Buildings Design and Automation (IBDAA) by Subject "energy consumption"
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Item Impact of Ventilation on the Thermal Comfort by Operable Window in a Typical UAE Office(The British University in Dubai (BUiD), 2015-04) Ajayan, InduNatural ventilation has been the main feature for maintaining thermal comfort in a space since ages. The research intends to merge the use of natural and artificial ventilation to create a comfortable thermal environment for the occupants of an office. It also helps to reduce the total energy consumption of the building. Statistics suggest that UAE has been considered as one of the major per capita consumers of electricity and water, (Dubai Carbon, 2014). In order to reduce the total energy consumption, a strategy is formulated to use natural ventilation in office space with the use of operable windows. The study was conducted on a typical office building in Dubai, UAE. Integrated Environment Solutions (IES VE 2013) was used to analyze the various configurations on the virtual office created. The main factors that are taken into consideration in this system are the orientation of the opening, type of window, percentage opening of the window, the flow rate of the incoming air, the desired temperature of the occupant and the status of the external environment. An automation profile is created for ventilation so that it is available under the best suited weather conditions to reduce the use of air conditioners by making the interior thermally comfortable to the people. The total favorable hours is taken as the criteria of initial study. Based on these criteria specific cases were chosen to have the configuration for least energy consumption. The research concludes that a reduction of 35.49% in the annual energy consumption can be obtained from a combined ventilation systems. It is also noted that the major saving happens when there are more hours of favorable temperature which is the winter season. The temperature chosen by the occupant plays a major role in the energy reduction criteria. It was noticed that the major energy reduction is obtained by maintaining a proper set point temperature. The ventilation combined system also performs in a similar pattern at a lower level of energy consumption. The difference in the energy consumption between the two systems varies from 3% to 5%. The study concludes with the understanding that the ventilation pattern when incorporated into cooling system reduces the energy consumption but significant energy saving can be done using the right set point temperature. Also it can be noticed that the maximum saving occurs during the winter season.Item Optimization of the Energy Performance in the Hospitality Sector in UAE by Using the Integrated Control Methodology in the Guestrooms(The British University in Dubai (BUiD), 2014-05) AlFaris, FadiThis dissertation aims to study the energy efficiency in the hospitality sector in UAE. It will discuss the energy benchmarking analysis for the lodging buildings to differentiate between the usual practice and best practice in terms of energy performance for the hotels. This research focuses on developing several criteria such as; the hotel’s gross floor area, star classification, building age, occupancy rate, guestrooms number, construction code and regulation and cooling energy source, to appraise the hotel building energy consumption with, by gathering a real energy data and basic building information, normalization of energy use index and analyze these data statistically to ascertain the expected energy performance and consumption in UAE. About 19 hotel buildings energy data was analyzed to provide the energy benchmarking findings in UAE hotels. Besides, the normalized energy use index kWh/m²/year has been concluded for the best, usual and poor practice hotels. It was found after the analysis of the collected data that the normalized EUI ranges between lower than 241.5 kWh/m²/year as a best practice and greater than 361.3kWh/m²/year of the poor energy practice for the hotels constructed after the year of 2003, when more stringent code adopted by Dubai Municipality. Whereas the hotels’ energy data showed higher values for those constructed before 2003, as the normalized EUI varies between lower than 348.4 kWh/m²/year as best practice and greater than 511.1kWh/m²/year. As the hospitality sector in UAE is growing to meet the current and upcoming demand. It would be an important requirement to reduce the gap between the poor, usual and the best energy management practices. In this dissertation, the integrated control strategy for the guestroom has been studied and modeled to present the potential of energy savings that might be achieved by using such integrated techniques. The building energy model in hourly basis has been conducted to assess the energy performance improvement after adopting the proposed system. It shows that at least 31.5% might be improved out of entire energy consumption of the hotel including electricity and gas; 43.2% energy savings for the cooling system and 13.2% for lighting system of the guestroom by installing the integrated control system.Item Reducing of the Energy Consumption in the Federal Buildings in UAE Using Lighting and Control Technologies(The British University in Dubai (BUiD), 2014-04) Al Awadi, Wafaa YousefUAE has one of the highest electricity consumption per capita in the world. This reflects negatively on the CO2 emissions which is an increasing determination in the UAE. CO2 emissions must be reduced as part of the global effort to reduce the greenhouse gases and mitigate global warming effects. This study aims to reduce the electricity consumptions in the federal buildings in the UAE. This research used to find the best lighting and control technologies that can be used in Federal Buildings in UAE to reduce the total energy consumption by reducing lighting energy consumption as a direct energy and also the HVAC (cooling) energy which is the indirect energy that can be saved depending on saving in lighting energy. Three lighting technology proposals were compared to the existing lighting in MOPW-RAK building. The three proposed lighting technologies were compared to the existing lighting technology in three different areas: Meeting Room, Electromechanical Office, and Corridor. Also, lighting control technologies were also applied to the selected areas in the building and compared to the base case also. The building was simulated in two different simulation software’s: Dialux lighting simulation software and IES-VE building energy efficiency modeling software. Some calculations and comparisons between the results were done. From the results, analysis and comparisons we found that LED lights is the best because it has the highest amount of saving the lighting energy. CFL is the worst solution for our case because it uses magnetic ballast. This is the main reason of the high energy consumption in CFL. It was found that with the use of Occupancy sensors, energy savings were 10%, while for Daylight Sensor and Dimming Systems were 25%. The most expensive option is when using the full power lighting without control Systems. Using energy savings Lighting technologies not only affects lighting energy consumption, but are also affect HVAC energy savings because of the outcome heat from the Lighting technologies. Lighting Control Technology also have an effects on HVAC energy savings because of the relation between the HVAC and Lighting which was proved using IES-VE software which show that the Fraction between Lighting and HVAC is 0.33. In another word, each 1KWH of lighting energy equal 3 KWH of HVAC energy consumptions.