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Dr. Som S. Shrestha
Oak Ridge National Laboratory, Building Technologies Research and Integration Center, 1 Bethel Valley Rd, Oak Ridge, TN 37831, USA

Basic Info


Research Keywords & Expertise

0 Experimental and analytical studies to increase the energy efficiency and durability of building envelope, equipment, and systems
0 Developing and deploying innovative materials and technologies for building applications
0 Advanced envelope assemblies that enable dynamic control
0 Laboratory and field evaluation of energy efficiency enhancement technologies
0 Energy savings calculation from such technologies through whole-building modeling and simulations

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Preprint content
Published: 16 July 2021
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ACS Style

Daniel Howard; Som Shrestha; Diana Hun; Amit Rai; Tianli Feng; Mingkan Zhang; Hongyu Zhou. Effective Thermal Conductivity of Closed Cell Insulation: Impact of Gas Diffusion to Long-Term Performance. 2021, 1 .

AMA Style

Daniel Howard, Som Shrestha, Diana Hun, Amit Rai, Tianli Feng, Mingkan Zhang, Hongyu Zhou. Effective Thermal Conductivity of Closed Cell Insulation: Impact of Gas Diffusion to Long-Term Performance. . 2021; ():1.

Chicago/Turabian Style

Daniel Howard; Som Shrestha; Diana Hun; Amit Rai; Tianli Feng; Mingkan Zhang; Hongyu Zhou. 2021. "Effective Thermal Conductivity of Closed Cell Insulation: Impact of Gas Diffusion to Long-Term Performance." , no. : 1.

Preprint content
Published: 16 July 2021
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ACS Style

Amit Rai; Som Shrestha; Diana Hun; Tianli Feng; Mingkan Zhang. Calculator for Development of Low\u2013thermal-Conductivity Materials. 2021, 1 .

AMA Style

Amit Rai, Som Shrestha, Diana Hun, Tianli Feng, Mingkan Zhang. Calculator for Development of Low\u2013thermal-Conductivity Materials. . 2021; ():1.

Chicago/Turabian Style

Amit Rai; Som Shrestha; Diana Hun; Tianli Feng; Mingkan Zhang. 2021. "Calculator for Development of Low\u2013thermal-Conductivity Materials." , no. : 1.

Preprint content
Published: 16 July 2021
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ACS Style

Tianli Feng; Jixiong He; Amit Rai; Diana Hun; Jun Liu; Som Shrestha. Discovering Size Effect of Thermal Conductivity of Amorphous Polymers. 2021, 1 .

AMA Style

Tianli Feng, Jixiong He, Amit Rai, Diana Hun, Jun Liu, Som Shrestha. Discovering Size Effect of Thermal Conductivity of Amorphous Polymers. . 2021; ():1.

Chicago/Turabian Style

Tianli Feng; Jixiong He; Amit Rai; Diana Hun; Jun Liu; Som Shrestha. 2021. "Discovering Size Effect of Thermal Conductivity of Amorphous Polymers." , no. : 1.

Technical report
Published: 01 April 2021 in Fabrication of New PCM Hydrogel Composites
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ACS Style

Yuzhan Li; Vera Bocharova; Seung Pyo Jeong; Navin Kumar; Som Shrestha; Kyle Gluesenkamp; Diana Hun. Fabrication of New PCM Hydrogel Composites. Fabrication of New PCM Hydrogel Composites 2021, 1 .

AMA Style

Yuzhan Li, Vera Bocharova, Seung Pyo Jeong, Navin Kumar, Som Shrestha, Kyle Gluesenkamp, Diana Hun. Fabrication of New PCM Hydrogel Composites. Fabrication of New PCM Hydrogel Composites. 2021; ():1.

Chicago/Turabian Style

Yuzhan Li; Vera Bocharova; Seung Pyo Jeong; Navin Kumar; Som Shrestha; Kyle Gluesenkamp; Diana Hun. 2021. "Fabrication of New PCM Hydrogel Composites." Fabrication of New PCM Hydrogel Composites , no. : 1.

Journal article
Published: 03 December 2020 in Journal of Building Engineering
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This paper presents a life-cycle cost (LCC) informed co-design framework for building structures and envelope systems, holistically considering the influences of energy and natural hazard performance. The proposed method is consisted of a two-stage design and decision-making process, aiming to provide a quantitative guideline for building's structural and envelope co-design based on the its geographic locations. First, the building's structural configuration and envelope type are selected based on the life cycle cost. Then, the long-term cost effectiveness of various energy-saving building envelope options (e.g., high-performance glazing and insulation) is evaluated to refine the envelope design. The proposed co-design framework was demonstrated through the case study of a medium-size office building archetype in three locations with distinct climate conditions and seismic activities (i.e., Los Angeles, Memphis, and Boston). The results highlighted the interplay between building's structural (seismic) performance and the cost-effectiveness of energy-saving design options – e.g., for buildings located in high-seismic regions, seismic enhancing designs greatly reduce the paybak period of high performance building envelope by reducing the seismic loss; whereas for buildings located in regions with cold climate and low seismic risk such as Boston, spatial frame with high insulation building envelope shows the lowest LCC.

ACS Style

Zhenglai Shen; Hongyu Zhou; Som Shrestha. LCC-based framework for building envelope and structure co-design considering energy efficiency and natural hazard performance. Journal of Building Engineering 2020, 35, 102061 .

AMA Style

Zhenglai Shen, Hongyu Zhou, Som Shrestha. LCC-based framework for building envelope and structure co-design considering energy efficiency and natural hazard performance. Journal of Building Engineering. 2020; 35 ():102061.

Chicago/Turabian Style

Zhenglai Shen; Hongyu Zhou; Som Shrestha. 2020. "LCC-based framework for building envelope and structure co-design considering energy efficiency and natural hazard performance." Journal of Building Engineering 35, no. : 102061.

Journal article
Published: 08 October 2020 in International Journal of Heat and Mass Transfer
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Determining the energy accommodation between gases and solids is essential to developing porous thermal insulation materials with ultra-low effective thermal conductivity that reduce energy use, greenhouse gas emissions, and fossil fuel consumption. The energy accommodation coefficients of most gases, however, have been rarely studied, especially with respect to solids that have relatively high thermal resistivity, e.g., polymers. In this work, by using all-atom nonequilibrium molecular dynamics simulations, we reveal the accommodation coefficients of He, Ar, N2, and O2 with polymers, mainly polystyrene. We find that their values are around 0.51, 0.72, 0.79, and 0.90, respectively, suggesting a critical reexamination of the commonly used theoretical maximum value of 1. We have also conducted experiments and validated the value for air, which is about 0.81. Such a change in accommodation coefficients can lead to a reduction of about 70%, 50%, 35%, and 20% in the thermal conductivity of He, Ar, N2, and O2 gases in nano pores (below 100 nm) or at low pressures (below 1 millibar). With these new accommodation coefficients, we find that in a 10 nm pore with ambient pressure at 300 K, the gas thermal conductivity of He, Ar, N2, and O2 in porous polystyrene can be as low as 9.7 × 10−4, 3.4 × 10−4, 7.3 × 10−4, and 8.5 × 10−4 W·m−1·K−1, respectively, which are two to three orders of magnitude lower than their bulk values, promising higher thermal resistivity of insulation materials. This work reveals the fundamental energy exchange between gases and polymers, providing important guidance for designing high-performance thermal insulation materials for various applications.

ACS Style

Tianli Feng; Amit Rai; Diana Hun; Som S Shrestha. Molecular dynamics simulations of energy accommodation between gases and polymers for ultra-low thermal conductivity insulation. International Journal of Heat and Mass Transfer 2020, 164, 120459 .

AMA Style

Tianli Feng, Amit Rai, Diana Hun, Som S Shrestha. Molecular dynamics simulations of energy accommodation between gases and polymers for ultra-low thermal conductivity insulation. International Journal of Heat and Mass Transfer. 2020; 164 ():120459.

Chicago/Turabian Style

Tianli Feng; Amit Rai; Diana Hun; Som S Shrestha. 2020. "Molecular dynamics simulations of energy accommodation between gases and polymers for ultra-low thermal conductivity insulation." International Journal of Heat and Mass Transfer 164, no. : 120459.

Journal article
Published: 18 August 2020 in Renewable and Sustainable Energy Reviews
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In anticipation of emerging global urbanization and consequent increases in energy use and carbon dioxide emissions, better understanding and quantification of climate effects on energy use in cities are needed, requiring coordinated research into large-scale, regional, and microclimate impacts to and from the city structure. The methodology described here addresses this need by (1) demonstrating a process for creating and testing example morphologies for new neighborhoods for their impact on local and regional meteorology within a two-way-coupled four-domain nested mesoscale weather model (6 km horizontal resolution outer domain, 90 m horizontal innermost domain) and (2) allocating resulting building-level meteorological profiles to each building in a neighborhood for parallel computation of building-by-building energy use. Our Chicago Loop test case shows that the morphology of even a small new added development to a neighborhood affects not only its own microclimate, but also the microclimate of the original neighborhood to which the development was added, and that these changes in microclimate affect both neighborhoods’ building energy use. This method represents an important step toward quantifying and analyzing the relationships among climatic conditions, urban morphology, and energy use and using these relationships to inform energy-efficient urban development and planning.

ACS Style

Melissa R. Allen-Dumas; Amy N. Rose; Joshua R. New; Olufemi A. Omitaomu; Jiangye Yuan; Marcia L. Branstetter; Linda M. Sylvester; Matthew B. Seals; Thomaz M. Carvalhaes; Mark B. Adams; Mahabir S. Bhandari; Som S. Shrestha; Jibonananda Sanyal; Anne S. Berres; Carl P. Kolosna; Katherine S. Fu; Alexandra C. Kahl. Impacts of the morphology of new neighborhoods on microclimate and building energy. Renewable and Sustainable Energy Reviews 2020, 133, 110030 .

AMA Style

Melissa R. Allen-Dumas, Amy N. Rose, Joshua R. New, Olufemi A. Omitaomu, Jiangye Yuan, Marcia L. Branstetter, Linda M. Sylvester, Matthew B. Seals, Thomaz M. Carvalhaes, Mark B. Adams, Mahabir S. Bhandari, Som S. Shrestha, Jibonananda Sanyal, Anne S. Berres, Carl P. Kolosna, Katherine S. Fu, Alexandra C. Kahl. Impacts of the morphology of new neighborhoods on microclimate and building energy. Renewable and Sustainable Energy Reviews. 2020; 133 ():110030.

Chicago/Turabian Style

Melissa R. Allen-Dumas; Amy N. Rose; Joshua R. New; Olufemi A. Omitaomu; Jiangye Yuan; Marcia L. Branstetter; Linda M. Sylvester; Matthew B. Seals; Thomaz M. Carvalhaes; Mark B. Adams; Mahabir S. Bhandari; Som S. Shrestha; Jibonananda Sanyal; Anne S. Berres; Carl P. Kolosna; Katherine S. Fu; Alexandra C. Kahl. 2020. "Impacts of the morphology of new neighborhoods on microclimate and building energy." Renewable and Sustainable Energy Reviews 133, no. : 110030.

Journal article
Published: 05 October 2019 in Energies
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This article describes a novel application of thermal anisotropy for improving the energy efficiency of building envelopes. The current work was inspired by existing research on improved heat dissipation in electronics using thermal anisotropy. Past work has shown that thermally anisotropic composites (TACs) can be created by the alternate layering of two dissimilar, isotropic materials. Here, a TAC consisting of alternate layers of rigid foam insulation and thin, high-conductivity aluminum foil was investigated. The TAC was coupled with copper tubes with circulating water that acted as a heat sink and source. The TAC system was applied to a conventional wood-framed wall assembly, and the energy benefits were investigated experimentally and numerically. For experimental testing, large scale test wall specimens were built with and without the TAC system and tested in an environmental chamber under simulated diurnal hot and cold weather conditions. Component-level and whole building numerical simulations were performed to investigate the energy benefits of applying the TAC system to the external walls of a typical, single-family residential building.

ACS Style

Kaushik Biswas; Som Shrestha; Diana Hun; Jerald Atchley. Thermally Anisotropic Composites for Improving the Energy Efficiency of Building Envelopes †. Energies 2019, 12, 3783 .

AMA Style

Kaushik Biswas, Som Shrestha, Diana Hun, Jerald Atchley. Thermally Anisotropic Composites for Improving the Energy Efficiency of Building Envelopes †. Energies. 2019; 12 (19):3783.

Chicago/Turabian Style

Kaushik Biswas; Som Shrestha; Diana Hun; Jerald Atchley. 2019. "Thermally Anisotropic Composites for Improving the Energy Efficiency of Building Envelopes †." Energies 12, no. 19: 3783.

Book chapter
Published: 01 October 2019 in Symposium on Whole Building Air Leakage: Testing and Building Performance Impacts
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ACS Style

Som S. Shrestha; Diana Hun; Craig Moss. Modeling Whole Building Air Leakage and Validation of Simulation Results against Field Measurements. Symposium on Whole Building Air Leakage: Testing and Building Performance Impacts 2019, 277 -290.

AMA Style

Som S. Shrestha, Diana Hun, Craig Moss. Modeling Whole Building Air Leakage and Validation of Simulation Results against Field Measurements. Symposium on Whole Building Air Leakage: Testing and Building Performance Impacts. 2019; ():277-290.

Chicago/Turabian Style

Som S. Shrestha; Diana Hun; Craig Moss. 2019. "Modeling Whole Building Air Leakage and Validation of Simulation Results against Field Measurements." Symposium on Whole Building Air Leakage: Testing and Building Performance Impacts , no. : 277-290.

Report
Published: 01 May 2019 in Experimental and numerical evaluations of the energy savings potential of thermally anisotropic composites
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ACS Style

Kaushik Biswas; Som S. Shrestha; Diana E. Hun; Jerald Atchley. Experimental and numerical evaluations of the energy savings potential of thermally anisotropic composites. Experimental and numerical evaluations of the energy savings potential of thermally anisotropic composites 2019, 1 .

AMA Style

Kaushik Biswas, Som S. Shrestha, Diana E. Hun, Jerald Atchley. Experimental and numerical evaluations of the energy savings potential of thermally anisotropic composites. Experimental and numerical evaluations of the energy savings potential of thermally anisotropic composites. 2019; ():1.

Chicago/Turabian Style

Kaushik Biswas; Som S. Shrestha; Diana E. Hun; Jerald Atchley. 2019. "Experimental and numerical evaluations of the energy savings potential of thermally anisotropic composites." Experimental and numerical evaluations of the energy savings potential of thermally anisotropic composites , no. : 1.

Journal article
Published: 28 November 2018 in Energies
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Air leakage through the envelope of commercial buildings in the United States accounts for approximately 6% of their energy use. Various simulation approaches have been proposed to estimate the impact of air leakage on building energy use. Although approaches that are based on detailed airflow modeling appear to be the most accurate to calculate infiltration heat transfer in simulation models, these approaches tend to require significant modeling expertise and effort. To make these energy savings estimates more readily available to building owners and designers, Oak Ridge National Laboratory, the National Institute of Standards and Technology, the Air Barrier Association of America, and the US Department of Energy (DOE) are developing a user-friendly online calculator that applies a detailed airflow modeling approach to examine energy savings due to airtightness in commercial buildings. The calculator, however, is limited to 52 US cities and a few cities in Canada and China. This paper describes the development of an alternative, simplified method to estimate energy savings from improved airtightness. The proposed method uses the same detailed approach for hourly infiltration calculations as the online calculator but it expands the ability to estimate energy savings to all US cities using hourly outdoor air temperature as the only input. The new simple regression model-based approach was developed and tested with DOE’s standalone retail prototype building model. Results from the new approach and the calculator show good agreement. Additionally, a simple approach to estimate percent energy savings for retrofitted buildings was also developed; results were within 5% of the energy saving estimates from the online calculator.

ACS Style

Mahabir Bhandari; Diana Hun; Som Shrestha; Simon Pallin; Melissa Lapsa. A Simplified Methodology to Estimate Energy Savings in Commercial Buildings from Improvements in Airtightness. Energies 2018, 11, 3322 .

AMA Style

Mahabir Bhandari, Diana Hun, Som Shrestha, Simon Pallin, Melissa Lapsa. A Simplified Methodology to Estimate Energy Savings in Commercial Buildings from Improvements in Airtightness. Energies. 2018; 11 (12):3322.

Chicago/Turabian Style

Mahabir Bhandari; Diana Hun; Som Shrestha; Simon Pallin; Melissa Lapsa. 2018. "A Simplified Methodology to Estimate Energy Savings in Commercial Buildings from Improvements in Airtightness." Energies 11, no. 12: 3322.

Journal article
Published: 03 November 2018 in Applied Energy
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This paper presents the energy savings potential of a newly developed liner applied on the foam insulation used in refrigerator and freezer cabinets, compared with using a more commonly used liner made from high-impact polystyrene. The new polylactic acid polymer liner is made from renewable feedstock such as carbon found in plant sugars. The energy use over the life of refrigerator and freezer is calculated using the Energy-Efficient Refrigerator Analysis program developed by the United States Department of Energy to estimate the energy savings potential of various technology option upgrades (cabinet and refrigeration system) for rulemaking purposes. The simulation results show that energy savings from implementing the Ingeo liner range from 818 to 1395 kWh (7.3–12.5% of total energy use) over a 15-year period. In addition to the energy savings, the slower increase in the thermal conductivity of the insulation could allow the compressor to run fewer hours per year compared with a case in which the foam thermal conductivity increases rapidly. This change could increase the life of the compressor and the refrigerators and freezers. This study does not attempt to quantify the impact of slower foam aging on the compressor life.

ACS Style

Nemat Hossieny; Som S. Shrestha; Osei A. Owusu; Manuel Natal; Rick Benson; Andre Desjarlais. Improving the energy efficiency of a refrigerator-freezer through the use of a novel cabinet/door liner based on polylactide biopolymer. Applied Energy 2018, 235, 1 -9.

AMA Style

Nemat Hossieny, Som S. Shrestha, Osei A. Owusu, Manuel Natal, Rick Benson, Andre Desjarlais. Improving the energy efficiency of a refrigerator-freezer through the use of a novel cabinet/door liner based on polylactide biopolymer. Applied Energy. 2018; 235 ():1-9.

Chicago/Turabian Style

Nemat Hossieny; Som S. Shrestha; Osei A. Owusu; Manuel Natal; Rick Benson; Andre Desjarlais. 2018. "Improving the energy efficiency of a refrigerator-freezer through the use of a novel cabinet/door liner based on polylactide biopolymer." Applied Energy 235, no. : 1-9.

Journal article
Published: 20 October 2018 in Renewable Energy
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Experimental investigations and numerical analyses were conducted on the thermal attributes of a building system made with locally available structural and insulation materials. The structural material, which also offers some insulation qualities, is referred to as aerated slurry-infiltrated mesh. The insulation materials used in this building are based on biomass; the alternatives considered here include ground wood, shredded straw, and cellulose. Thermal conductivity tests were performed on aerated slurries of different bulk densities, and on the biomass-based insulation materials, some of which were prepared with different bulk densities. The competitive merits of the biomass-based indigenous insulation materials were assessed. The correlations between bulk density and thermal conductivity were evaluated and rationalized based on the prevalent mechanisms of heat transfer in different materials. The effects of temperature on the thermal conductivity of different biomass-based indigenous insulation materials were investigated. For wall insulation, a cost analysis was conducted in order to select the optimum insulation level. The thermal mass of the aerated slurry-infiltrated mesh building system was found to favor its energy-efficiency when compared with a similar wood building.

ACS Style

Areej T. Almalkawi; Parviz Soroushian; Som S. Shrestha. Evaluation of the Energy-Efficiency of an Aerated Slurry-Infiltrated Mesh Building System with Biomass-Based Insulation. Renewable Energy 2018, 133, 797 -806.

AMA Style

Areej T. Almalkawi, Parviz Soroushian, Som S. Shrestha. Evaluation of the Energy-Efficiency of an Aerated Slurry-Infiltrated Mesh Building System with Biomass-Based Insulation. Renewable Energy. 2018; 133 ():797-806.

Chicago/Turabian Style

Areej T. Almalkawi; Parviz Soroushian; Som S. Shrestha. 2018. "Evaluation of the Energy-Efficiency of an Aerated Slurry-Infiltrated Mesh Building System with Biomass-Based Insulation." Renewable Energy 133, no. : 797-806.

Technical report
Published: 01 October 2018 in Experimental Validation of a New Cost-Effective and Nonintrusive BTU Meter
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The U.S. Department of Energy's Office of Scientific and Technical Information

ACS Style

Xiaobing Liu; Som S. Shrestha. Experimental Validation of a New Cost-Effective and Nonintrusive BTU Meter. Experimental Validation of a New Cost-Effective and Nonintrusive BTU Meter 2018, 1 .

AMA Style

Xiaobing Liu, Som S. Shrestha. Experimental Validation of a New Cost-Effective and Nonintrusive BTU Meter. Experimental Validation of a New Cost-Effective and Nonintrusive BTU Meter. 2018; ():1.

Chicago/Turabian Style

Xiaobing Liu; Som S. Shrestha. 2018. "Experimental Validation of a New Cost-Effective and Nonintrusive BTU Meter." Experimental Validation of a New Cost-Effective and Nonintrusive BTU Meter , no. : 1.

Dissertation
Published: 13 August 2018 in Empirical validation of building energy simulation software:: EnergyPlus
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ACS Style

Som Shrestha. Empirical validation of building energy simulation software:: EnergyPlus. Empirical validation of building energy simulation software:: EnergyPlus 2018, 1 .

AMA Style

Som Shrestha. Empirical validation of building energy simulation software:: EnergyPlus. Empirical validation of building energy simulation software:: EnergyPlus. 2018; ():1.

Chicago/Turabian Style

Som Shrestha. 2018. "Empirical validation of building energy simulation software:: EnergyPlus." Empirical validation of building energy simulation software:: EnergyPlus , no. : 1.

Dissertation
Published: 09 August 2018 in Performance evaluation of carbon-dioxide sensors used in building HVAC applications
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Carbon-dioxide sensors are widely used as part of a demand controlled ventilation (DCV) system for buildings requiring mechanical ventilation, and their performance can significantly impact energy use in these systems. Therefore, a study was undertaken to test and evaluate the most commonly used CO2 sensors in HVAC applications, namely the non-dispersive infrared (NDIR) type. Fifteen models of NDIR HVAC-grade wall-mounted CO2 sensors were tested and evaluated to determine the accuracy, linearity, repeatability, hysteresis, humidity sensitivity, temperature sensitivity, and pressure sensitivity of each sensor as well as effect of long-term ageing on sensor performance. All tests were conducted in a chamber specifically designed and fabricated for this research. In all, 45 sensors were evaluated: three from each of the 15 models. Among the 15 models tested, eight models have a single-lamp, single-wavelength configuration, four models have a dual-lamp, single-wavelength configuration, and three models have a single-lamp, dual-wavelength configuration. All single-lamp single-wavelength sensors and one single-lamp dual-wavelength sensor incorporate an "automatic baseline adjustment" algorithm in the sensor's electronics package. The accuracy, linearity, repeatability, and hysteresis of the sensors were evaluated at a fixed relative humidity, temperature, and pressure, by varying CO2 concentrations from 400 ppm to 1800 ppm. The test results showed a wide variation in sensor performance among the various manufacturers and in some cases a wide variation among sensors of the same model. The humidity sensitivity was evaluated by varying the relative humidity from 20% to 60% while holding the CO2 concentration, temperature, and pressure fixed. The temperature sensitivity was evaluated by varying the temperature from 66yF (18.9yC) to 80yF (26.7yC) while holding the gas composition and pressure fixed. The pressure sensitivity was evaluated by varying the pressure from 14.70 psia (101.35 kPa) to 11.80 psia (81.36 kPa) while holding the gas composition and temperature fixed. The test results showed that while humidity sensitivity of most of the sensors is negligibly small, some sensors are strongly affected by humidity. The test results also showed that the effects of temperature and pressure variation on NDIR CO2 sensors are unavoidable. For the range of temperature and pressure variation in an air-conditioned space, the effect of pressure variation is more significant compared to the effect of temperature variation. The long-term ageing effect was evaluated at four month intervals for one year. The result showed a wide variation in ageing effect among manufacturers. Some sensor models showed a nominal ageing effect of less than

ACS Style

Som Shrestha. Performance evaluation of carbon-dioxide sensors used in building HVAC applications. Performance evaluation of carbon-dioxide sensors used in building HVAC applications 2018, 1 .

AMA Style

Som Shrestha. Performance evaluation of carbon-dioxide sensors used in building HVAC applications. Performance evaluation of carbon-dioxide sensors used in building HVAC applications. 2018; ():1.

Chicago/Turabian Style

Som Shrestha. 2018. "Performance evaluation of carbon-dioxide sensors used in building HVAC applications." Performance evaluation of carbon-dioxide sensors used in building HVAC applications , no. : 1.

Journal article
Published: 01 March 2018 in International Journal of Refrigeration
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Bo Shen; Omar Abdelaziz; Som Shrestha; Ahmed Elatar. Model-based optimizations of packaged rooftop air conditioners using low global warming potential refrigerants. International Journal of Refrigeration 2018, 87, 106 -117.

AMA Style

Bo Shen, Omar Abdelaziz, Som Shrestha, Ahmed Elatar. Model-based optimizations of packaged rooftop air conditioners using low global warming potential refrigerants. International Journal of Refrigeration. 2018; 87 ():106-117.

Chicago/Turabian Style

Bo Shen; Omar Abdelaziz; Som Shrestha; Ahmed Elatar. 2018. "Model-based optimizations of packaged rooftop air conditioners using low global warming potential refrigerants." International Journal of Refrigeration 87, no. : 106-117.

Report
Published: 01 December 2017 in New Air- and Water-Resistive Barriers -– Technology Verification
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ACS Style

Diana E. Hun; Mahabir S. Bhandari; Som S. Shrestha. New Air- and Water-Resistive Barriers -– Technology Verification. New Air- and Water-Resistive Barriers -– Technology Verification 2017, 1 .

AMA Style

Diana E. Hun, Mahabir S. Bhandari, Som S. Shrestha. New Air- and Water-Resistive Barriers -– Technology Verification. New Air- and Water-Resistive Barriers -– Technology Verification. 2017; ():1.

Chicago/Turabian Style

Diana E. Hun; Mahabir S. Bhandari; Som S. Shrestha. 2017. "New Air- and Water-Resistive Barriers -– Technology Verification." New Air- and Water-Resistive Barriers -– Technology Verification , no. : 1.

Technical report
Published: 01 February 2017 in State-of-the-Art for Hygrothermal Simulation Tools
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The hygrothermal (heat and moisture) performance of buildings can be assessed by utilizing simulation tools. There are currently a number of available hygrothermal calculation tools available which vary in their degree of sophistication and runtime requirements. This report investigates three of the most commonly used models (WUFI, HAMT, and EMPD) to assess their limitations and potential to generate physically realistic results to prioritize improvements for EnergyPlus (which uses HAMT and EMPD). The outcome of the study shows that, out of these three tools, WUFI has the greatest hygrothermal capabilities. Limitations of these tools were also assessed including: WUFI’s inability to properly account for air leakage and transfer at surface boundaries; HAMT’s inability to handle air leakage, precipitationrelated moisture problems, or condensation problems from high relative humidity; and multiple limitations for EMPD as a simplified method to estimate indoor temperature and humidity levels and generally not used to estimate the hygrothermal performance of the building envelope materials. In conclusion, out of the three investigated simulation tools, HAMT has the greatest modeling potential, is open source, and we have prioritized specific features that can enable EnergyPlus to model all relevant heat and moisture transfer mechanisms that impact the performance of building envelopemore » components.« less

ACS Style

Philip Boudreaux; Joshua Ryan New; Som S. Shrestha; Mark B. Adams; Simon B. Pallin. State-of-the-Art for Hygrothermal Simulation Tools. State-of-the-Art for Hygrothermal Simulation Tools 2017, 1 .

AMA Style

Philip Boudreaux, Joshua Ryan New, Som S. Shrestha, Mark B. Adams, Simon B. Pallin. State-of-the-Art for Hygrothermal Simulation Tools. State-of-the-Art for Hygrothermal Simulation Tools. 2017; ():1.

Chicago/Turabian Style

Philip Boudreaux; Joshua Ryan New; Som S. Shrestha; Mark B. Adams; Simon B. Pallin. 2017. "State-of-the-Art for Hygrothermal Simulation Tools." State-of-the-Art for Hygrothermal Simulation Tools , no. : 1.

Journal article
Published: 02 September 2016 in Science and Technology for the Built Environment
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ACS Style

Bo Shen; Som Shrestha; Omar Abdelaziz. Model validations for low-global warming potential refrigerants in mini-split air-conditioning units. Science and Technology for the Built Environment 2016, 22, 1254 -1262.

AMA Style

Bo Shen, Som Shrestha, Omar Abdelaziz. Model validations for low-global warming potential refrigerants in mini-split air-conditioning units. Science and Technology for the Built Environment. 2016; 22 (8):1254-1262.

Chicago/Turabian Style

Bo Shen; Som Shrestha; Omar Abdelaziz. 2016. "Model validations for low-global warming potential refrigerants in mini-split air-conditioning units." Science and Technology for the Built Environment 22, no. 8: 1254-1262.