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Full-Text Articles in Engineering
Ground Source Heat Pumps Vs. Conventional Hvac: A Comparison Of Economic And Environmental Costs, Paul W. Fredin
Ground Source Heat Pumps Vs. Conventional Hvac: A Comparison Of Economic And Environmental Costs, Paul W. Fredin
Theses and Dissertations
The world is undergoing a dramatic transformation with regard to how it produces and consumes energy due to increasing demand from developing nations and diminishing new resource discoveries. In addition, there has been increased concern over the effect of carbon dioxide emissions on the environment. All of these issues have created a combined pressure to force the world to begin to redefine how energy is utilized. Geothermal or ground source heat pumps (GSHPs) may provide one potential solution to these problems. This research investigated vertical borehole closed-loop GSHP systems in direct comparison to natural gas furnaces combined with traditional air-conditioning …
The Effect Of Office Chair Backrest Design On The Body's Metabolic Response To Office Work, Stephen H. Freier
The Effect Of Office Chair Backrest Design On The Body's Metabolic Response To Office Work, Stephen H. Freier
Master's Theses (2009 -)
Most office chairs have a backrest that is wider at the shoulders than at the hips. Recently, a new office chair was developed that has a backrest that is narrower at the shoulders and wider at the hips (upwardly tapered backrest). The upwardly tapered backrest should allow users to increase their ventilatory efficiency, compared to a conventional, wide backrest. This new backrest design will hypothetically allow a user to retract their scapulae, increase expansion of the chest cavity, thus allowing the lungs more space to expand. Specific measures of improved ventilatory efficiency are an increase in tidal volume (Vt …