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Field testing to estimate ozone emission rates of in-duct air cleaners in occupied homes 13

Field testing to estimate ozone emission rates of in-duct ai...

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13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014

作者： Shaughnessy, Richard Reisdorph, David Morrison, Glenn Indoor Air Program Department of Chemical Engineering University of Tulsa OK United States Civil Architectural and Environmental Engineering Department Missouri University of Science and Technology RollaMO United States

Considerable concern, research, and regulation have been linked to the use of portable air cleaners that intentionally (or unintentionally) produce ozone in the indoor environment. This research focuses on the potential for electrically connected in-duct air cleaners to increase indoor concentrations of ozone in field sites. The objective of the research was to measure the incremental increase in the ozone concentration and estimate the in-use ozone emission rate when a commercially available in-duct air cleaning device is operating. Devices tested included UV lamps, photocatalytic oxidation systems and electrostatic precipitators. A field method was implemented in 6 houses and 1 commercial space. In-duct air cleaners produced ozone to varying degrees, increasing the indoor home concentration by as much as 134 ppb while operating normally in residences. Emission rates as high as 436 mg h-1 were observed., Explicit ozone generators were the highest emitters, raising indoor concentrations above 50 ppb in most tests. Most other devices did not raise ozone concentrations above 50 ppb and ozone emission rates for these devices were below 50 mg h-1.

关键词： Ozone

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Accuracy tests for simulations of VAV dual-duct, single-zone, four-pipe fan-coil, and four-pipe induction air-handling systems

Accuracy tests for simulations of VAV dual-duct, single-zone...

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2006 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, ASHRAE

作者： Yuill, G.K. Haberl, J.S. Caldwell, J.S. ASHRAE Architectural Engineering Program University of Nebraska Lincoln Department of Architecture Texas A and M University College Station TX James Posey Associates Baltimore MD

This paper provides a method for verifying the accuracy of computer models that simulate the performance of the air-handling components of four types of heating, ventilating, and air-conditioning systems: the dual-fan VAV dual-duct system, the single-zone system, the four-pipe fan-coil system, and the four-pipe induction system. To accomplish this, a detailed description of each system and its operating parameters was developed and a set of eight test conditions was generated, consisting of carefully chosen space loads and weather conditions. Each of the systems was simulated at each of the defined conditions. The thermodynamic properties at each point in the system, as well as the heating and cooling coil loads, were calculated. The calculations were then repeated by a second analyst using an independently developed program. The maximum deviation in the total coil loads was 1.8%, and the average of the absolute deviations was 0.4%. These validated results can be used by program developers or users to test the performance of the air-side simulations contained in most building energy analysis computer programs. © 2006 ASHRAE.

关键词： Air conditioning

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Acoustical prediction methods for heating, ventilating, and air-conditioning (HVAC) systems

Acoustical prediction methods for heating, ventilating, and ...

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19th National Conference on Noise Control engineering 2005, Noise-Con 2005

作者： Ryherd, Steven R. Wang, Lily M. Architectural Engineering Program University of Nebraska - Lincoln PKI 1110 S. 67th St. Omaha NE 68182 United States

ISBN: (纸本)9781622762712

The goal of this project was to compare and contrast various aspects of acoustical prediction methods for heating, ventilating, and air-conditioning (HVAC) systems. The three methods included two commonly used software programs and a custom spreadsheet developed by the authors based on the American Society of Heating, Refrigeration, and Air-conditioning Engineers (ASHRAE) Applications Handbook. Preliminary results indicate relatively good agreement between the three methods analyzed. The degree of disparity is predominantly affected by the assumptions required by the end user. Research methods and results will be presented. This project provides a greater understanding of these acoustical prediction methods and their limitations.

关键词： Handbooks

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Appropriate characterization of background noise levels in the workplace

Appropriate characterization of background noise levels in t...

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AEI 2006

作者： Bowden, Erica E. Wang, Lily M. Architectural Engineering Program University of Nebraska - Lincoln PKI 1110 S. 67th St. Omaha NE 68182 United States

ISBN: (纸本)0784407983

Overall loudness is not the only quality of indoor background noise that affects occupants. The distribution of noise across frequency (pitch), whether or not the noise contains tones, and whether or not the noise changes over time must also be considered. There are several indoor noise criteria systems available to quantify the background noise in rooms, but many of them do not account for these factors. These systems are commonly used by architects and engineers, and often incorporated into manufacturer's data, design guides, and standards. There is much debate over which of the criteria systems best reflect how occupants will respond to noise. To examine these issues, an extensive study is being completed at the University of Nebraska investigating the effects of various types of air-conditioning noise on occupant productivity and perception. Results from performance tests and questionnaires are used to evaluate a number of these noise criteria systems. Specific implications of this project on characterizing noise in the workplace will be discussed. Copyright ASCE 2006.

关键词： Acoustic noise

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Evaluating energy savings potential in United States residential buildings

Evaluating energy savings potential in United States residen...

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Construction Research Congress 2012: Construction Challenges in a Flat World

作者： Kolahdoozan, Sami Leite, Fernanda Construction Engineering and Project Management Program Department of Civil Architectural and Environmental Engineering University of Texas at Austin 1 University Station C1752 Austin TX 78712 United States

ISBN: (纸本)9780784412329

There are currently many discussions on sustainability emphasizing the needs of infrastructure, lower energy consumption, durability, and recyclability. In the United States, residential buildings consume 22% of the country's total energy and also are responsible for 22% of carbon dioxide emitted to the environment. The main objective of this research is determining the potential energy savings in residential buildings in the U.S. To find energy savings potential, the Residential Energy Consumption Survey (RECS) was used. This dataset provides general information on condition of appliances and buildings components as well as energy consumption in residential buildings. Based on RECS, this study took a broad look at energy savings potential for space heating, air conditioning, refrigerators, freezers, and lighting in residential buildings. Results of this study indicate that 29% and 19% of energy used for space heating, space cooling can respectively be saved by improving building components such as glasses and thermal insulation. In addition, results of this study show that 5% of total electricity used in residential buildings is delivered to nonefficient refrigerators, freezers, and light bulbs. By realizing the aforementioned energy savings in buildings, not only will consumers pay less money for their energy bills, but also greenhouse gas emissions from buildings can be reduced. Also, results of this study can help decision makers allocate tax credits for different products in such a way as to encourage actions targeting higher energy savings. © 2012 ASCE.

关键词： Energy conservation

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Effects of noise on productivity: Does performance decrease over time?

Effects of noise on productivity: Does performance decrease ...

引用

AEI 2006

作者： Errett, Jessica Bowden, Erica E. Choiniere, Marc Wang, Lily M. Architectural Engineering Program University of Nebraska - Lincoln PKI 1110 S. 67th St. Omaha NE 68182 United States

ISBN: (纸本)0784407983

Most people at one time or another have found themselves irritated or distracted by the background noise in a building. The irritation might have resulted in minor aggravation or may have been dramatic enough to hinder their work. This leads us to ask whether occupants are increasingly aggravated by noise the longer they are exposed to it, or if they naturally habituate to their acoustic environment. In an effort to answer this question, a study was completed in the "Indoor Environment Lab" at the University of Nebraska. This lab resembles a typical office and was specially constructed to be acoustically and thermally controlled. Subjects completed 38 total hours of testing in the lab over multiple days, during which time they were exposed to several background noise conditions over 20, 40, 80, and 240 minute trials. During the trials, subjects completed a variety of performance tasks and answered questions about their perception of the noise, the thermal environment and various other factors. End results aid in understanding the prolonged effects of typical heating, ventilating, and air-conditioning (HVAC) noise on worker productivity and annoyance. Copyright ASCE 2006.

关键词： Acoustic variables control

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Acoustics of elementary school classrooms: Correlations of varying background noise level and reverberation time to student achievement.

Acoustics of elementary school classrooms: Correlations of v...

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38th International Congress and Exposition on Noise Control engineering 2009, INTER-NOISE 2009

作者： Ronsse, Lauren M. Wang, Lily M. Architectural Engineering Program University of Nebraska - Lincoln 1110 S. 67th St. Omaha NE 68182-0681 United States

ISBN: (纸本)9781615676903

This research correlates two classroom acoustic parameters, background noise level and reverberation time, with standardized student achievement scores in elementary school classrooms in a midwestern United States public school system. Previous research in this area has shown high background noise level and reverberation time in spaces negatively impacts children's learning and performance. However, the specific levels at which detrimental effects begin to occur have not been clearly defined. The recommendation in the ANSI S12.60 Classroom Acoustics Standard for unoccupied background noise level is 35 dBA. Because many of the previous classroom acoustics studies have targeted spaces with higher background noise levels, more research is needed to determine if the unoccupied background noise level must necessarily be this low. This study surveys a wide range of elementary school classrooms to determine what (if any) unoccupied background noise level and reverberation time are necessary for optimizing student achievement.

关键词： Reverberation

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Integrated damper and pressure reset for VAV supply air fan control

Integrated damper and pressure reset for VAV supply air fan ...

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Technical and Symposium Papers - 2004 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers

作者： Wei, Guanghua Liu, Mingsheng Claridge, David E. Energy Systems Laboratory Texas A and M University College Station TX Department of Mechanical Engineering Texas A and M University College Station TX Architectural Engineering Program University of Nebraska Lincoln NE

This paper presents an integrated damper and pressure reset (IDPR) method for variable air volume (VAV) system fan control. The IDPR method controls the static pressure at a minimum required level while maintaining at least one terminal box damper at full open position. When the entire system is flawless, the fan speed is controlled in a way similar to the terminal regulated air volume (TRAV) method to maintain at least one terminal box damper full open. When system faults exist, however, this control strategy uses less fan power than the TRAV method. The IDPR method can be implemented in both full DDC (direct digital control) systems and hybrid systems, where only the space temperature readings are communicated to the DDC controller at the air-handler level and the terminal boxes are controlled by pneumatic controllers. ©2004 ASHRAE.

关键词： Fans

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PulaCloud: Using human computation to enable development at the bottom of the economic ladder

PulaCloud: Using human computation to enable development at ...

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2011 AAAI Workshop

作者： Schriner, Andrew W. Oerther, Daniel B. Uber, James G. University of Cincinnati Environmental Engineering and Science Program Cincinnati OH 45221 United States Missouri University of Science and Technology Department of Civil Architectural and Environmental Engineering Rolla MO 5409 United States

ISBN: (纸本)9781577355274

This research aims to explore how Human Computation can be used to aid economic development in communities experiencing extreme poverty throughout the world. Work is ongoing with a community in rural Kenya to connect them to employment opportunities through a Human Computation system. A feasibility study has been conducted in the community using the 3D protein folding game Foldit and Amazon's Mechanical Turk. Feasibility has been confirmed and obstacles identified. Current work includes a pilot study doing image analysis for two research projects and developing a GUI that is usable by workers with little computer literacy. Future work includes developing effective incentive systems that operate both at the individual level and the group level and integrating worker accuracy evaluation, worker compensation, and result-credibility evaluation. Copyright © 2011, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Artificial intelligence

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A review of diffuse reflections in architectural acoustics

A review of diffuse reflections in architectural acoustics

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AEI 2006

作者： Rathsam, Jonathan Wang, Lily M. Architectural Engineering Program University of Nebraska - Lincoln Peter Kiewit Institute 1110 S. 67th St. Omaha NE 68182-0681

ISBN: (纸本)0784407983

Diffuse reflections have received increasing attention in architectural acoustics over the past quarter century. The term diffuse refers to non-specular directions. This paper identifies three mechanisms that cause diffuse reflections. Practitioners have found that changing specular reflections into diffuse reflections can reduce noise and echoes both indoors and outdoors. Developers of acoustical modeling software have also found that modeling diffuse in additional to specular reflections produces more accurate predictions. The final portion of this paper presents results for a study of scattering coefficients in acoustical modeling software. Copyright ASCE 2006.

关键词： architectural acoustics

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