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Evaluation Of A Ceramic Roof Coating, William H. Allen, Jay D. Harmon, Dale E. Linvill, Matthew V. Bramblett
Evaluation Of A Ceramic Roof Coating, William H. Allen, Jay D. Harmon, Dale E. Linvill, Matthew V. Bramblett
Jay D. Harmon
Surfaces treated with a ceramic roof coating (CRC) marketed as AZTEC No. 100 were compared to untreated and white painted surfaces. Dry-bulb and black globe temperatures in the space below or behind the surface were the criteria for comparison. Comparisons included small horizontal panels with open sides, small unvented galvanized steel and styrofoam boxes, and an open-side steel poultry building. The CRC was effective in reducing temperatures in the enclosed test boxes, but less effective with open-side test panels and the open-side steel building. Tests also indicated the CRC is characterized by high emissivity (0.95) and reflectivity (0.87). The evidence …
Effects Of Hurricane Hugo On Agricultural Structures, Jay D. Harmon, George F. Grandle, Clyde L. Barth
Effects Of Hurricane Hugo On Agricultural Structures, Jay D. Harmon, George F. Grandle, Clyde L. Barth
Jay D. Harmon
A tour of damage to agricultural structures by hurricane Hugo was conducted. Empty grain bins which exhibited improper anchorage tended to fail. Post-frame buildings that were improperly anchored, braced or fastened failed, while others that were designed and constructed using sound engineering practices generally withstood hurricane winds.
Modeling Environmental Response To Power Interruptions In Swine Nurseries, Jay D. Harmon, E. R. Collins Jr., E. T. Kornegay
Modeling Environmental Response To Power Interruptions In Swine Nurseries, Jay D. Harmon, E. R. Collins Jr., E. T. Kornegay
Jay D. Harmon
A deterministic simulation model was developed to help assess emergency environmental needs of swine nurseries by modeling short term power interruptions. The model accounts for heat exchange by conduction, convection, radiation and air infiltration. A sub-model, developed by the North Central Region Committee 179, was used to predict swine heat and moisture loss. The model was validated using a nursery constructed of concrete block. The model performed well for cases with a constant solar load but tended to overpredict temperature changes during periods of no solar load. Validation indicated that wind velocity had the most effect upon model error. Sensitivity …
Pressure Interactions In Slotted Eave Inlets, Jay D. Harmon, K. A. Janni, L. D. Jacobson
Pressure Interactions In Slotted Eave Inlets, Jay D. Harmon, K. A. Janni, L. D. Jacobson
Jay D. Harmon
Pressure Interactions in Slotted Eave Inlets Pressure Interactions in Slotted Eave Inlets ABSTRACT Afull scale physical model eave opening and baffled slot inlet system for a mechanically ventilated livestock building was tested to determine the effect of pressure differences and attic opening size on air flow rates. Pressure differences were varied between the eave, attic and room of the model. Flow rates through the attic and the room, and corresponding pressure differences were measured to calculate loss coefficients. Closed attic tests that prevented interactions between the inlet and attic were conducted to develop regression equations to predict the coefficient of …