Determination of Moisture Index in Korea

Ra, Ji-Eun

doi:10.5658/wood.2018.46.4.301

Journal of the Korean Wood Science and Technology

2018

DOI: 10.5658/wood.2018.46.4.301

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Determination of Moisture Index in Korea

Ji-Eun Ra¹

Abstract: This study aimed to obtain basic climate information for effective moisture control in wood in Korea. Two independent climate indexes, namely drying index (DI) and wetting index (WI), were determined using hourly weather data for 82 locations recorded from 2009 to 2017. These data were collected from the Korea Meteorological Administration (KMA). Hourly data had not been measured prior to 2009. DI and WI revealed that all regions were cold and wet except Baengnyeongdo, which was classified as a cold and dry re… Show more

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Cited by 2 publications

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Effects of Density, Temperature, Size, Grain Angle of Wood Materials on Nondestructive Moisture Meters

Pang¹,

Jeong²

2019

Journal of the Korean Wood Science and Technology

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The aim of this study was to investigate the effects of density, temperature, size, and grain direction on measurement of moisture contents (MC) of wood materials non-destructively. The MC of different sizes of solid wood, glulam, and CLT from larch (larix kaempferi, 560 kg/m 3 ) and pine (pinus koraiensis, 430 kg/m 3 ) were measured using the dielectric type and resistance type meters. The specimens were conditioned in the environmental chamber to be equilibrium moisture content (EMC) of 12 % and 19 %. When density setting in dielectric type meter was increased from 400 kg/m 3 to 600 kg/m 3 , the MCs of specimen (S-L-100-E) were decreased from 13.4 % to 11.3 %. However, when wood group (WG) setting in resistance type meter was changed from WG1 to WG4, the measured MCs were increased from 9.2 % to 12.3 %. When temperature setting in resistance type meters was changed from 0 to 35 ℃, the MC was decreased from 17.0 % to 13.0 %. The MCs measured by dielectric type meter for larger specimens (S-L-100-E_11.3 %, G-L-240-E_11.7 % and C-L-120-E_12.8 %) were higher than those of small size specimens (S-L-30-E_8.7 %, G-L-150-E_10.3 %, and C-L-90-E_9.7 %). The MCs measured by resistance type meter for larger specimens (G-L-240-E_11.6 % and C-L-120-E_13.3 %) were also higher than those of small size specimens (G-L-150-E_10.4 %, and C-L-90-E_11.8 %). The resistance type meter was not affected by the grain direction but the dielectric type meter were affected by the grain direction. The MC measured by resistance type meter for G-L-120-E perpendicular to grain direction was 11.5 % and the measured MC parallel to grain direction was 11.3 %. The MC measured by dielectric type meter parallel to grain direction (12.1 %) was higher than that measured perpendicular to grain direction (10.7 %).

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Effects of Density, Temperature, Size, Grain Angle of Wood Materials on Nondestructive Moisture Meters

Pang¹,

Jeong²

2019

Journal of the Korean Wood Science and Technology

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Moisture Content Change of Korean Red Pine Logs During Air Drying: I. Effective Air Drying Days in Major Regions in Korea

Han¹,

Eom²,

Lee³

et al. 2019

Journal of the Korean Wood Science and Technology

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Air drying depends on species, density, dimension of wood, the geographical location of the air drying yard, and the meteorological factors of air drying site. If there are four seasons with large difference in temperature and humidity like in Korea, the research of the meteorological factors is required in air drying site. In this study, effective air drying days (EADD) of 24 regions in Korea were calculated by using the average monthly temperature, relative humidity, and wind speed. The EADD in 24 regions in Korea was ranged from 239 days to 291 days, with an average 265 days. This result is 5 days increased compared to the average of EADD calculated using the meteorological factors from 1955 to 1984. The results of multiple regression analysis on the EADD and meteorological factors showed that EADD affected in the order of temperature, relative humidity, and wind speed. As a result of dividing Korea into 4 zones of EADD, the zones of EADD were moved northward compared to previous study due to global warming. As basic data for predicting the moisture content (MC) distribution of Korean red pine logs during air drying conducted in Seoul, the average monthly temperature, relative humidity and wind speed for three years from 2016 to 2018 were presented, and the corresponding changes of the equilibrium MC were analyzed.

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Determination of Moisture Index in Korea

Cited by 2 publications

References 6 publications

Effects of Density, Temperature, Size, Grain Angle of Wood Materials on Nondestructive Moisture Meters

Effects of Density, Temperature, Size, Grain Angle of Wood Materials on Nondestructive Moisture Meters

Moisture Content Change of Korean Red Pine Logs During Air Drying: I. Effective Air Drying Days in Major Regions in Korea

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