Potencial de economia de energia elétrica através do uso da luz natural e da ventilação híbrida em edifícios comerciais em Florianópolis

O objetivo deste estudo é estimar o potencial de economia de energia elétrica com o uso da luz natural integrada ao sistema de iluminação artificial e a utilização da ventilação híbrida em edifícios comerciais localizados em Florianópolis, SC. O trabalho foi baseado em simulações computacionais nos programas EnergyPlus e Daysim. Foram simulados modelos de ambientes de edificações comerciais, com três geometrias, três dimensões de sala por geometria, dez áreas de janela por modelo e quatro orientações. Os modelos foram examinados por meio de quatro estudos de caso. No Caso 1 (referência), a edificação opera com sistemas de iluminação e de condicionamento artificiais; no Caso 2, ocorre a integração da iluminação natural com a artificial, com condicionamento artificial; já no Caso 3, utilizam-se a ventilação híbrida e a iluminação artificial; no Caso 4, adotam-se a iluminação natural integrada com a artificial e a ventilação híbrida. Os consumos de eletricidade do Caso 1 foram comparados com os demais casos. Assim, foi estimado o potencial de economia de energia elétrica gerado pelo uso da luz natural e ventilação híbrida. Conclui-se que a utilização da iluminação natural e da ventilação híbrida em edificações comerciais localizadas em Florianópolis apresenta potencial de economia de energia elétrica de até 64,9% e que essas estratégias podem ser utilizadas para aumentar a eficiência energética desse tipo de edificação

Factors associated with the course of maternal fatigue across the early postpartum period

Background: Relatively little is known about the course and persistence of fatigue across the postpartum period, despite the potentially adverse effects fatigue has on maternal daily functioning, well-being, parenting behaviour and parent-child interactions. Objective: Using multi-wave data over a 4-month period in the postpartum, the present study sought to: (a) examine the course of maternal fatigue, and (b) identify a range of potentially modifiable individual and contextual factors associated with the course of fatigue over this time. Methods: Seventy mothers of infants aged between 0 and 7 months participated in the current study. To measure change over time and predictors of fatigue, latent growth curve analysis was used. Results: The results indicated that maternal fatigue at approximately three months postpartum was moderate to high, with little or no change in fatigue severity over time. Higher fatigue scores at three months postpartum were also significantly associated with younger maternal age, higher socioeconomic disadvantage, low self-efficacy to engage in health behaviours and poor sleep quality. Older maternal age and poor sleep quality were associated with stability of fatigue over time. Conclusions: Findings underscore the importance of identifying and supporting women experiencing high levels of fatigue in the first seven months postpartum. Additionally, findings highlight potential risk factors for initial and persistent fatigue, possibly allowing the identification of women who might be more vulnerable to fatigue. Implications for future research and practice are discussed

Advection Diffusion Model for Gas Transport Within a Packed Bed of JSC-1A Regolith Simulant - Data File

Data files contain the unprocessed numerical data presented in the following manuscript. File names correspond to manuscript figures: Garrett L. Schieber, Brant M. Jones, Thomas M. Orlando, Peter G. Loutzenhiser. Acta Astronautica 2020 4 (169), 32-39. DOI: https://doi.org/10.1016/j.actaastro.2019.12.031The advection diffusion model was evaluated for gas transport within a packed bed of lunar JSC-1A regolith simulant at low to medium total pressures over three flow regimes: (1) the slip flow regime (2) the transition regime and (3) the Knudsen regime. These regimes are pertinent to the design of H2O extraction devices for in-situ resource utilization, sampling missions, and surface science. Experimentation was conducted over a range of average pressures of 100 to 25,000 Pa, corresponding to Knudsen numbers between 0.01 and 100 at ambient temperature with Ar and N2. Non-condensing, gases with ideal behavior were evaluated to isolate key flow properties as first step towards evaluating more complex H2O flows. Experimental results were coupled to physical models, and key properties were evaluated to assess the model fit. The experimental results in the transition regime followed the expected behavior based on similar works for microchannel flow and showed that advection is not negligible for transition regime flows. The advection diffusion model in the transition regime fit the results for Knudsen numbers less than unity, and showed the need to further develop gas slip models for Knudsen numbers greater than unity. Key parameters necessary to define were the porosity, tortuosity, pore diameter of the regolith medium, and the gas slip parameter was key in determining the gas-specific transport rate.NASA Solar System Exploration Research Virtual Institute (SSERVI) NNA17BF68

Characterization of H2O Transport Through Johnson Space Center Number 1A Lunar Regolith Simulant at Low Pressure for In-situ Resource Utilization - Data File

Data file contains the unprocessed numerical data and supplementary figures for the manuscript: G. L. Schieber, B. M. Jones, T. M. Orlando, and P. G. Loutzenhiser, (in press). Characterization of H2O transport through Johnson Space Center number 1A lunar regolith simulant at low pressure for in-situ resource utilization. Physics of Fluids. DOI: https://doi.org/10.1063/5.0042589H2O transport through a packed bed of Johnson Space Center number 1A (JSC-1A) lunar regolith simulant was examined at relevant temperatures and pressures for in-situ resource utilization (ISRU) on the Moon. Experimentation was conducted over a range of pressures from 50 to 2,065 Pa at ~350 K, corresponding to Knudsen numbers of 0.3 < Kn < 11 and relevant towards ISRU technologies. A piecewise function was used to evaluate transition and Knudsen regime flows. The piecewise model utilized a Knudsen number that predicted the transition point between advective and Knudsen flows. A transition Knudsen number of 1.66 ± 0.61 and a tortuosity shape parameter of 0.736 ± 0.13 were determined from non-linear regression, and Knudsen diffusivities of 10.62 cm2·s-1, 10.40 cm2·s-1 and 9.04 cm2·s-1 for packed beds of JSC-1A with porosities of 0.388, 0.385, and 0.365, respectively. The experimental measurements, methodology, and modeling provide useful information for ISRU technologies involving the transport of volatiles (e.g., thermal extraction of H2O).NASA Solar System Exploration Research Virtual Institute (SSERVI) NNA17BF68