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Full-Text Articles in Engineering

Use Of Air Infiltration In Swine Housing Ventilation System Design, Harishchandra T. Jadhav, Steven J. Hoff Jan 2019

Use Of Air Infiltration In Swine Housing Ventilation System Design, Harishchandra T. Jadhav, Steven J. Hoff

Agricultural and Biosystems Engineering Publications

The objective of this research was to develop and analyze the procedure for using recent air infiltration (AI) data collected from commercial swine finishing rooms (SFRs) in the design of negative pressure mechanical ventilation systems (VSs). Air infiltration is an integral part of any ventilation process. Infiltration reduces the pressure differential across planned inlets and at very low pressure differences, cold air jets may drop directly on the animals causing significant discomfort. In this article, a design procedure is proposed for swine housing ventilation systems with the influence of air infiltration included. The method was used on one SFR for ...


Swine Finishing Room Air Infiltration: Part 2. Infiltration As Affected By Room Characteristics, Harishchandra T. Jadhav, Steven J. Hoff, Jay D. Harmon, Daniel S. Andersen Jan 2018

Swine Finishing Room Air Infiltration: Part 2. Infiltration As Affected By Room Characteristics, Harishchandra T. Jadhav, Steven J. Hoff, Jay D. Harmon, Daniel S. Andersen

Agricultural and Biosystems Engineering Publications

Data collected on 17 swine finishing rooms from the Midwest region of the United States was used to study the relationship between infiltration rate and selected room characteristics. Effect of individual room characteristics on room infiltration rate were tested by simple linear regression (SLR) while multiple linear regression (MLR) was used to develop models for improved prediction. SLR results revealed that the total (It) and other (Io; non-curtain/fan locations) swine finishing room infiltration rates were inversely related to room width and directly related to room length and ceiling height. As expected, rooms with higher curtain end pocket overlap, curtain ...


Swine Finishing Room Air Infiltration: Part 1. Quantification And Prediction, Harishchandra T. Jadhav, Steven J. Hoff, Jay D. Harmon, Ignacio Alvarez, Daniel S. Andersen, Ulrike Passe Jan 2018

Swine Finishing Room Air Infiltration: Part 1. Quantification And Prediction, Harishchandra T. Jadhav, Steven J. Hoff, Jay D. Harmon, Ignacio Alvarez, Daniel S. Andersen, Ulrike Passe

Agricultural and Biosystems Engineering Publications

Air infiltration through unplanned inlets is an integral component of any ventilation process. Air infiltration affects the quality of the room environment and can also increase winter heating costs. Precise data on air infiltration is very important in the design of animal room ventilation systems. Nineteen mechanically ventilated (negative pressure type) swine finishing rooms in Iowa were tested for their air infiltration potential. Using the data of 17 rooms, air infiltration rate through the whole room (i.e., total air infiltration, It), curtains (Ic), fans (If) and net building shell (other components, Io) were quantified. Power ...


The Effect Of Five Biomass Cropping Systems On Soil-Saturated Hydraulic Conductivity Across A Topographic Gradient, Lisa A. Schulte-Moore, Matthew J. Helmers, Randall K. Kolka Sep 2017

The Effect Of Five Biomass Cropping Systems On Soil-Saturated Hydraulic Conductivity Across A Topographic Gradient, Lisa A. Schulte-Moore, Matthew J. Helmers, Randall K. Kolka

Agricultural and Biosystems Engineering Publications

Understanding the environmental impact of bioenergy crops is needed to inform bioenergy policy development. We determined the effects of five biomass cropping systems—continuous maize (Zea mays), soybean (Glycine max)-triticale (Triticosecale ×)/soybean-maize, maize-switchgrass (Panicum virgatum), triticale/sorghum (Sorghum bicolor), and triticale-aspen (Populus alba × P. grandidentata)—on soil-saturated hydraulic conductivity (K S ) across a toposequence in central Iowa, USA. We compared data from the time of cropping system establishment in 2009 to 4 years post-establishment. Both our 2009 and 2013 data confirmed that cropping system impacts on K S vary by landscape position. We found that differences in cropping system ...


Infiltration Characteristics Of Swine Finishing And Gestation Buildings: Review And Quantification, Harishchandra T. Jadhav, Steven J. Hoff, Jay D. Harmon, Larry D. Jacobson, Brian Hetchler Jul 2015

Infiltration Characteristics Of Swine Finishing And Gestation Buildings: Review And Quantification, Harishchandra T. Jadhav, Steven J. Hoff, Jay D. Harmon, Larry D. Jacobson, Brian Hetchler

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Infiltration is an integral part of the ventilation system and process. Infiltration affects the quality of the barn environment and can also increase the winter heating cost. Precise data on infiltration is very important in the design of ventilation systems for animal barns. Many researchers have suggested that ASHRAE’s ‘crack’ method is not suitable for predicting infiltration of animal barns. Among the available methods, pressurization methods are commonly used in infiltration quantification and the power law model gives the best prediction of the infiltration rate. For this research project, 18 swine finishing rooms and three swine gestation rooms were ...


Effect Of Corn Or Soybean Row Position On Soil Water, Sally D. Logsdon, Thomas J. Sauer, Guillermo Hernandez-Ramirez, Jerry L. Hatfield, Amy L. Kaleita-Forbes, John H. Prueger Nov 2010

Effect Of Corn Or Soybean Row Position On Soil Water, Sally D. Logsdon, Thomas J. Sauer, Guillermo Hernandez-Ramirez, Jerry L. Hatfield, Amy L. Kaleita-Forbes, John H. Prueger

Agricultural and Biosystems Engineering Publications

Crop plants can funnel water to the soil and increase water content more in the row relative to the interrow. Because the row intercepts more soil water after rains and higher root density, the soil may also dry out more between rains than does soil in the interrow. The objectives of this study were to determine if there is a row position difference in soil wetting after rain and drying between rains, and to determine the seasonal nature of these differences. The first experiment examined soil water content 0 to 0.06 m in row, interrow, and quarter corn row ...


Green-Ampt Infiltration Parameters In Riparian Buffers, L. M. Stahr, Dean E. Eisenhauer, Matthew J. Helmers, Michael G. Dosskey, T. G. Franti Aug 2004

Green-Ampt Infiltration Parameters In Riparian Buffers, L. M. Stahr, Dean E. Eisenhauer, Matthew J. Helmers, Michael G. Dosskey, T. G. Franti

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Riparian buffers can improve surface water quality by filtering contaminants from runoff before they enter streams. Infiltration is an important process in riparian buffers. Computer models are often used to assess the performance of riparian buffers. Accurate prediction of infiltration by these models is dependent upon accurate estimates of infiltration parameters. Of particular interest here are Green-Ampt infiltration parameters, satiated hydraulic conductivity (Ko) and wetting front suction (hf). The objectives of this research were to (i) modify the Smith sorptivity procedure so that it can be used to estimate Green-Ampt infiltration parameters, (ii) Determine the relative closeness of Ko estimated ...


Assessing Air Infiltration Rates Of Agricultural Use Ventilation Curtains, Steven J. Hoff Jan 2001

Assessing Air Infiltration Rates Of Agricultural Use Ventilation Curtains, Steven J. Hoff

Agricultural and Biosystems Engineering Publications

Curtains commonly used in the agricultural ventilation industry were evaluated for air infiltration characteristics as a function of curtain material, closure overlap distance, and wind speed in a controlled and calibrated wind tunnel. Curtain material ranged from polypropylene to woven mesh with measured specific weights varying between 168 and 866 gm/m 2 (0.6 and 2.8 oz/ft 2 ). Curtains classified as breathable allow as much as 1243 m 3 /h–m 2 (68 cfm/ft 2 ) of infiltration air at wind speeds of 13.4 m/s (30 mph). For non–breathable curtains at wind speeds of ...


Interpreting Tension-Infiltrometer Data For Quantifying Soil Macropores: Some Practical Considerations, Christopher J. Everts, Ramesh S. Kanwar Jan 1993

Interpreting Tension-Infiltrometer Data For Quantifying Soil Macropores: Some Practical Considerations, Christopher J. Everts, Ramesh S. Kanwar

Agricultural and Biosystems Engineering Publications

A tension-infiltrometer offers a practical means for obtaining information on soil infiltration characteristics at low soil moisture tensions in the field. This study examines interpretation of tension-infiltrometer results. Saturated hydraulic conductivities (Ks) calculated from unconfined tension-infiltrometer measurements were not statistically different from conductivity measurements made with a velocity-head permeameter. Ks values determined with the tension-infiltrometer were greater than conductivities measured with a Guelph permeameter. Tension-infiltrometer measurements of infiltration made through a 20-mm layer of sand were an order of magnitude less than ponded infiltration measurements at the same location. Increases in antecedent soil moisture decreased infiltration values, but parameters for ...