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Wednesday, July 22, 2020 | History

4 edition of Effect of wet bulb depression on heat sterilization time of slash pine lumber found in the catalog.

Effect of wet bulb depression on heat sterilization time of slash pine lumber

William Turner Simpson

Effect of wet bulb depression on heat sterilization time of slash pine lumber

by William Turner Simpson

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Published by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in Madison, WI .
Written in English

    Subjects:
  • Lumber -- Diseases and pests -- Control,
  • Lumber -- Drying,
  • Lumber -- Heat treatment

  • Edition Notes

    StatementWilliam T. Simpson
    SeriesResearch paper FPL-RP -- 604
    ContributionsForest Products Laboratory (U.S.)
    The Physical Object
    FormatMicroform
    Pagination6 p.
    ID Numbers
    Open LibraryOL13570035M
    OCLC/WorldCa52860661

    ments. A mild or moderate heat stress may cause discomfort and may ad­ versely affect performance and safety, but it is not harmful to health. As the heat stress approaches human tolerance limits, the risk of heat-related disor­ ders increases. Heat Strain is the overall physiological response resulting from heat . Background: Heat exposure among construction workers in the Persian Gulf region is a serious hazard for health. The aim of this study was to evaluate the performance of wet bulb globe temperature (WBGT) Index for estimation of heat strain in hot/humid conditions by the use of Physiological Strain Index (PSI) as the gold standard.

    Effect of wet bulb depression on heat sterilization time of slash pine lumber / William T. Simpson. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, [] SDK66 Federalism in the forest: national versus state natural resource policy / Tomas M. Koontz.   We first search for the w that yields the same humidity/temperature influences with the derived heat balance equations for a human body—Eqs., —and the WBGT eff —, —for the standard shady and sunny WBGT conditions, respectively. Table 1 lists the mean ratios of α i /(α i +β i) and β i /(α i +β i) from Eq. under typical shady conditions with air velocities, v, of – m/s.

    The effects of heat stress and nutritional status on metabolism and intestinal integrity in growing pigs Sarah Pearce Iowa State University Follow this and additional works at: change in rectal temperature and respiration rates at all time points .. Figure A Effect of heat stress on temporal change. For example, assume that the dry-bulb tem- perature in a kiln is °F and the wet-bulb temper- ature °F. The wet-bulb depression then is 20 °F. Wet-bulb depression temperatures are shown across the top of tables and and dry-bulb temperatures on the extreme left of the table. To find the EMC at the assumed conditions, (1) locate.


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Effect of wet bulb depression on heat sterilization time of slash pine lumber by William Turner Simpson Download PDF EPUB FB2

For international trade, heat sterilization of wood products is often required to prevent the spread of insects and pathogens. Application of heat sterilization requires estimates of the time necessary to heat the center of the wood configuration to the temperature required to kill the insect or other pest.

The nature of the heating medium was found to have a significant effect on heating time. Get this from a library. Effect of wet bulb depression on heat sterilization time of slash pine lumber. [William T Simpson; Forest Products Laboratory (U.S.)] -- For international trade, heat sterilization of wood products is often required to prevent the spread of insects and pathogens.

Application of heat sterilization requires estimates of the time. The nature of the heating medium was found to have a significant effect on heating time of slash pine lumber. The heating time increased exponentially with wet bulb depression.

When the wet bulb temperature in the heating chamber was below the desired center temperature, heating times were extended far beyond the times when target center. Effect of Wet Bulb Depression on Heat Sterilization Time of Slash Pine Lumber William T. Simpson, Research Forest Products Technologist Forest Products Laboratory, Madison, Wisconsin Introduction Heat sterilization of wood in various forms is currently receiving attention as.

Get this from a library. Effect of wet bulb depression on heat sterilization time of slash pine lumber. [William Turner Simpson; Forest Products Laboratory (U.S.)].

Download Citation | Effect of Wet Bulb Depression on Heat Sterilization Time of Slash Pine Lumber | For international trade, heat sterilization of wood products is often required to prevent the. and in.- ( and mm-) thick slash pine, heating time at F (C) increased exponentially with increase in wet bulb depression.

The time required for the center of green in.- (mm-)thick boards to reach F (C) varied from 15 min at a low wet bulb depression near saturation to Mechanisms responsible for the effect of wet bulb depression on heat sterilization of slash pine lumber Article in Wood and fiber science: journal of the Society of Wood Science and Technology and in.-( and mm-) thick slash pine, heating time at °F(71°C)increased exponentially with increase in wet bulb depression.

The time required for the center ofgreen in.- (mm-) thick boards to reach °F (56°C) vaned from 15 min at a low wet bulb depression near saturation to “Mechanisms responsible for the effect of wet bulb depression on heat sterilization of slash pine lumber,” Wood and Fiber Science 35(2), Teischinger, A.

“Effect of different drying temperatures on selected physical wood properties,” In: proceedings of 3rd IUFRO Int. Wood Drying Conference, Vienna, The proper time and temperature for dry heat sterilization is °C ( °F) for 2 hours or °C ( °F) for 1 hour or in the case of High Velocity Hot Air sterilisers °C (°F) for 6 to 12 minutes.

Items should be dry before sterilization since water will interfere with the process. 5/2/ 5 June – August 5/2/ What is Heat Treating Typical Kiln or Heat Chamber (HT) The core temperature of the lumber is brought to ° for 30 consecutive minutes.

NELMA requires °. This kills any pests that may be present. Sterilization. Kiln Drying and Heat. Simpson, W.T.

Mechanism responsible for the effect of wet bulb depression on heat sterilization time of slash pine lumber. Accepted for publication in Wood and Fiber Sci.

_____. Effect of wet bulb depression on heat sterilization time of slash pine lumber. Res. Pap. FPL-RP USDA, Forest Serv., Forest Prod. Lab., Madison, WI. Heat rash (prickly heat or milliaria) - An itchy rash of small raised red spots on the face, neck, back, chest and thighs caused by a hot and moist environment.

Heat strain - Physiological and behavioural responses of the body as a result of heat exposure. Heat stroke - Acute illness caused by overexposure to heat. Symptoms are dry, hot skin.

'.assuming the:maximum wet bulb depression listed in one the following: a: FPL*RP ' 'Heat Sterilization Time of Ponderosa Pine and Douglas fir Boards and Square Timbers" b: FPL-RP04 '"Effect Bulb Depression on Heat Sterilization Time of Slash Pine Lumber" €.

CFIA PI "The Technical Heat Treatment. Guidelines and Operating. The study shows that byextreme heat waves that are expected once every 25 years will worsen, from wet-bulb temperatures of about. Effect of wet bulb depression on heat sterilization time of slash pine lumber For international trade, heat sterilization of wood products is often required to prevent the spread of insects and pathogens.

Application of heat sterilization requires estimates of the time necessary to heat the center of the wood configuration to the temperature. Abstract. The purpose of this study was to evaluate the effects of an industrial heat treatment (ThermoWood) based on changes in the strength properties, density, and color of spruce (Picea abies) and pine (Pinus sylvestris) s were subjected to heat treatment processes at °C for a duration of min.

Heat sterilization, import/export lumber Related Search. Estimating heating times of wood boards, square timbers, and logs in saturated steam by multiple regression; Heat sterilization time of ponderosa pine and Douglas-fir boards and square timbers; Effect of wet bulb depression on heat sterilization time of slash pine lumber.

The natural adaptation to the heat takes time, and from a management perspective, it may require careful planning.

NIOSH Science Blog: Extreme Heat – Are you prepared for summer work. The approach of summer is a reminder to us all of the need to recognize, and act to prevent, the harmful effects of excessive heat. Some other wet-bulb cooling considerations: 1. The wet-bulbing out process is most accurate when precipitation is moderate or heavy.

Often light precipitation will leave a dewpoint depression of 5 or greater even after hours of precipitation. Thus, the maximum amount of wet-bulb cooling does not occur with light precipitation.

2. Wet Bulb Depression: The wet bulb depression is the difference between the dry-bulb temperature(Air temperature) and the wet-bulb temperature. It is measured by a psychrometer. If there is % humidity, dry-bulb and wet-bulb temperatures are ide.

In addition, extreme heat has been linked to increases in aggression and violence. One standard deviation of temperature increase and rainfall is associated with a 4% increase in interpersonal violence and 14% increase in intergroup violence.

4 Anecdotal stories underscore the well known lore among prison staff of increased inmate violence during heat waves. 5.