Anovelmethodforanalyzinggrainfacilityheattreatmentdata.pptVIP

A novel method for analyzing grain facility heat treatment data Hulya AKDOGAN Mark CASADA Alan DOWDY Bh. SUBRAMANYAM A novel method for analyzing grain facility heat treatment data~ Introduction ~ Management of Stored Product Insects (SPI) in grain processing facilities (chemical methods versus high temperatures) Heat treatment - a viable alternative to chemicals Target temperature ? 50oC, typically 50o to 60oC Temp., duration of exposure, species, stages of development, RH determines insect survival. A novel method for analyzing grain facility heat treatment data ~ Materials/Methods (1/2) ~ Pilot flour mill cleaning house at KSU (6/99 8/99) Two heating systems: gas electric Gas heating: heaters outside the building; hot air delivered inside the building through nylon ducts Electric heating: heaters within the building; power monitoring cables running outside the building Fans used for uniform temperature distribution Time/temperature/RH recorded every 10 min at floor level; 16-22 data loggers per room. Effectiveness of heat treatments compared by surface area method Surfer software used to calculate the surface areas % floor surface area 50oC as a function of time (duration of the heat treatment) and % floor surface area maximum floor temperature Contour maps of maximum floor temperature The surface area approach Surface areas calculated from Surfer outputs Normalized % surface area values for easy comparison The surface area approach (ctd.) A log-logistic equation used: Duration of treatment vs. % floor surface area 50?C Time delays (lag times) Gas heating slower at the beginning Electric heating mostly shorter compared to gas heating Heat treatment as an alternative to chemical treatments Different heating patterns of gas and electric heating-Time delays; % A under/over-heated Sufficient heat treatment uniform heat distribution Quantification identification of over-heated under-heated areas Characterizing the heating pattern of e