Matching Items (3)
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- All Subjects: HVAC
- All Subjects: Overuse Injuries
- Creators: Fairag, Amr
- Creators: Guarascio-Howard, Linda
- Creators: Lifgren, Taylor Nicole
Description
The concept of this thesis came up as a part of the efforts being devoted around the world to reduce energy consumption, CO2 emissions, global warming and ozone layer depletion. In the United States, HVAC units in residential buildings consumed about 350 billion kWh in 2017 [1],[2]. Although HVAC manufacturers are investing in new technologies and more efficient products to reduce energy consumption, there is still room for further improvement.
One way of reducing cooling and heating energy in residential buildings is by allowing the centralized HVAC unit to supply conditioned air to only occupied portions of the house by applying smart HVAC zoning. According to the United States Energy Information Administration [3], the percentage of houses equipped with centralized HVAC units is over 70%, which makes this thesis applicable to the majority of houses in the United States. This thesis proposes to implement HVAC zoning in a smart way to eliminate all human errors, such as leaving the AC unit on all day, which turns out to be causing a serious amount of energy to be wasted.
The total amount of energy that could be saved by implementing the concepts presented in this thesis in all single-family houses in the U.S. is estimated to be about 156 billion kWh annually. This amount of energy reduction is proportional to the electricity bills and the amount of dollars paid annually on energy that is technically being wasted.
One way of reducing cooling and heating energy in residential buildings is by allowing the centralized HVAC unit to supply conditioned air to only occupied portions of the house by applying smart HVAC zoning. According to the United States Energy Information Administration [3], the percentage of houses equipped with centralized HVAC units is over 70%, which makes this thesis applicable to the majority of houses in the United States. This thesis proposes to implement HVAC zoning in a smart way to eliminate all human errors, such as leaving the AC unit on all day, which turns out to be causing a serious amount of energy to be wasted.
The total amount of energy that could be saved by implementing the concepts presented in this thesis in all single-family houses in the U.S. is estimated to be about 156 billion kWh annually. This amount of energy reduction is proportional to the electricity bills and the amount of dollars paid annually on energy that is technically being wasted.
ContributorsFairag, Amr (Author) / Phelan, Patrick (Thesis advisor) / Bocanegra, Luis (Committee member) / Shuaib, Abdelrahman (Committee member) / Arizona State University (Publisher)
Created2018
Description
Youth club sport has become a dominant part of society and the forefront of many childhoods. Youth sport participation holds various physical, psychological, and social benefits for children but as this industry continues to expand, when poorly managed, sport participation can become detrimental (Meân, 2013, p. 339). In this study the experiences and perceptions of female youth club volleyball players (ages 15-17) were explored through semi-structured interviews with a particular focus on key areas of concern identified in the research literature: early specialization, overuse injury, and burnout (Hedstrom & Gould, 2004, p. 4, 15-37). A thematic analysis was used to explore these a priori themes alongside emergent themes that were identified: early motivation and perception, current motivation and perception, pressure and athletic scholarships, perception of high school volleyball, and schedules. The positive perceptions arising from the themes were addressed as a foundation to improve on the negative perceptions. Recommendations to reduce the pressure and stress associated with winning are made, in addition to proposals regarding the schedule of club volleyball in an effort to provide athletes with adequate rest period in order to reduce risks of burnout and overuse injury.
Keywords: youth sport, specialization, overuse injury, burnout, club volleyball.
Keywords: youth sport, specialization, overuse injury, burnout, club volleyball.
ContributorsLifgren, Taylor Nicole (Author) / Mean, Lindsey (Thesis director) / Cayetano, Catalina (Committee member) / School of Social and Behavioral Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
Construction work is ergonomically hazardous, as it requires numerous awkward postures, heavy lifting and other forceful exertions. Prolonged repetition and overexertion have a cumulative effect on workers often resulting in work related musculoskeletal disorders (WMSDs). The United States spends approximately $850 billion a year on WMSDs. Mechanical installation workers experience serious overexertion injuries at rates exceeding the national average for all industries and all construction workers, and second only to laborers. The main contributing factors of WMSDs are ergonomic loads and extreme stresses due to incorrect postures. The motivation for this study is to reduce the WMSDs among mechanical system (HVAC system) installation workers. To achieve this goal, it is critical to reduce the ergonomic loads and extreme postures of these installers. This study has the following specific aims: (1) To measure the ergonomic loads on specific body regions (shoulders, back, neck, and legs) for different HVAC installation activities; and (2) To investigate how different activity parameters (material characteristics, equipment, workers, etc.) affect the severity and duration of ergonomic demands. The study focuses on the following activities: (1) layout, (2) ground assembly of ductwork, and (3) installation of duct and equipment at ceiling height using different methods. The researcher observed and analyzed 15 HVAC installation activities among three Arizona mechanical contractors. Ergonomic analysis of the activities using a postural guide developed from RULA and REBA methods was performed. The simultaneous analysis of the production tasks and the ergonomic loads identified the tasks with the highest postural loads for different body regions and the influence of the different work variables on extreme body postures. Based on this analysis the results support recommendations to mitigate long duration activities and exposure to extreme postures. These recommendations can potentially reduce risk, improve productivity and lower injury costs in the long term.
ContributorsHussain, Sanaa Fatima (Author) / Mitropoulos, Panagiotis (Thesis advisor) / Wiezel, Avi (Committee member) / Guarascio-Howard, Linda (Committee member) / Arizona State University (Publisher)
Created2011