• 한국염색가공학회지
• /
• 제27권3호
• /
• pp.210-218
• /
• 2015

In this study, natural substance and mineral materials was used for architectural interior wallpaper. Because natural substance and minerals are environment-friendly material with moisture adsorption and desorption properties. Natural substance and mineral materials was evaluated in moisture adsorption and desorption properties. Also, in the diatomite, the pores were observed on SEM photographs. Thus, it is supposed that moisture adsorption and desorption properties were influenced by the microstructure of the pore. The wallpaper according to the ratio of the mixture was analyzed for physical properties and moisture adsorption & desorption properties. As a result, we developed a wallpaper having excellent hygrothermal performance.

• 한국재료학회지
• /
• 제19권10호
• /
• pp.538-543
• /
• 2009

Active clays, Diatomite, bentonite and zeolite were used as porous materials for fabricating hygroscopic gypsum boards. Pohang active clay and Cheolwon diatomite showed excellent characteristics of moisture adsorption and desorption. These characteristics were caused by higher surface area and pore volume of porous materials. Moisture adsorption content of gypsum board with 10% active clay(P1) was 62.0 g/m$^2$, and moisture desorption content was 50.2 g/m$^2$. Moisture adsorption content of gypsum board with 10% diatomite(P) was 59.5 g/m$^2$, and moisture desorption content was 49.0 g/m$^2$. Moisture adsorption contents of gypsum boards with porous materials were higher than that moisture desorption contents of gypsum board without porous materials. Correlation coefficient between surface area and moisture adsorption content of gypsum boards was 0.98. Also, correlation coefficient between surface area and moisture desorption content of gypsum boards was 0.97. Moisture adsorption and desorption contents were influenced by surface area and pore volume of the gypsum boards, and surface area had a larger effect on moisture adsorption and desorption.

• 한국세라믹학회지
• /
• 제45권12호
• /
• pp.832-838
• /
• 2008

Diatomite, bentonite and zeolite were used as porous materials for fabricating hygroscopic panels. Moisture adsorption and desorption of porous materials were investigated and hydrothermal method was applied to fabricate panels. Cheolwon diatomite and Pohang zeolite showed excellent characteristics of moisture adsorption and desorption. These characteristics were caused by higher surface area and pore volume of porous materials. Correlation coefficient between surface area and moisture adsorption content of porous materials was 0.93. Moisture adsorption contents were influenced by surface area and pore volume of panels, and surface area more effected on moisture adsorption. Correlation coefficient between surface area and moisture adsorption content of panels was 0.86. Moisture adsorption content of panel with 10% Pohang zeolite was $180\;g/m^2$ and that of 10% Cheolwon diatomite was $170\;g/m^2$. Moisture desorption content of panel with 10% Pohang zeolite was $105\;g/m^2$. Moisture adsorption contents of panel with porous materials were higher than that of panel without porous materials.

• Journal of Biosystems Engineering
• /
• 제30권2호
• /
• pp.95-101
• /
• 2005

Adsorption and desorption experiments were carried out on rough rice and brown rice (Nampyung) at 5, 15, 25, 35, $45^{\circ}C$ for moisture contents between 8.7 and $25\%$ (db). The method employed was to measure the equilibrium relative humidity (ERH) of air in contact with the grain under static conditions, using an electronic hygrometer The effects of temperature and moisture contents were investigated, and the measured values were fitted to the modified Henderson, the modified Chung-Pfost, the modified Halsey and the modified Oswin model. The ERHs of rough rice and brown rice decreased with an decrease in moisture content and temperature, and the effects of temperature was no significant at moisture content of $25\%$ (db). Equilibrium moisture content (EMC) of brown rice was higher than rough rice at same temperature and relative humidity. Desorption EMC is higher than the adsorption, but there is no significant difference between desorption and adsorption EMC in moisture content near $25\%$ (db) at rough rice and near 9, 21 and $25\%$ (db) at brown rice. The modified Oswin model was the best in describing the adsorption EMC and the modified Chung-Pfost model was the best in describing the adsorption ERH of rough rice. The modified Oswin model was the best in describing the adsorption EMC/ERH of brown rice. The modified Chung-Pfost model was the best in describing the desorption EMC/ERH of rough rice and brown rice.

• KIEAE Journal
• /
• 제9권2호
• /
• pp.53-58
• /
• 2009

There are increasing developments and uses of functional building materials are recently developed and introduced to the test method for the materials. Especially, moisture problem has a major role are also being established in indoor air quality problems. The purpose of this study is to evaluate the water vapour adsorption/desorption property of a ceiling material. The variation of the temperature and moisture were measured with the application materials by mock up test based on JIS 1470-1. The result shows that water vapour adsorption/desorption property of ceiling material is appeared in changes of moisture adsorption and desorption in comparison with that of a general ceiling material. Therefore, in case of decreasing and increasing in humidity, these materials can be used as an finishing material to sustain comfort condition.

• 한국가구학회지
• /
• 제19권6호
• /
• pp.447-451
• /
• 2008

This study was carried out to know the difference of vapor transmission on the thickness of Paulownia wood(Paulownia tomentosa). The behavior of moisture transmission of wood thickness direction is generally estimated by vapor permeability and vapor transmission resistance. In general, Paulownia wood is known to use of inside material for furniture making, because of the excellent ability of vapor adsorption and/or desorption. Quarter sawing Paulownia wood material is prepared and the thickness is 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10.0mm, respectively. The measurement of vapor transmission were conducted by the "cup method" in accordance with JIS(Japanese Industrial Standard) Z-0208. The experiment was made in the condition of 49.8mmHg vapor pressure difference and $40^{circ}C$ at constant temperature. From the experiment results, it was considered that Paulownia wood is very stable on moisture variation and any other material conditions. In this experiment we found that the vapor permeability and vapor permeance was reduced with the increase of wood thickness to vapor direction and vapor transmission resistance and specific vapor transmission resistance was increased with the increase of wood thickness to vapor direction. Besides moisture contents of adsorption and desorption side were about 5 percent and 14 percent, respectively. Mean value was 9.5 percent and about 10 percent in dry oven method. Moisture gradient was reduced with the increase of wood thickness for a small moisture difference of adsorption and desorption side.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
• /
• pp.705-708
• /
• 2008

본 연구에서는 규조토, 벤토나이트, 제올라이트를 사용하여 건축내장용 조습패널을 제조하였으며,패널 제조에 사용된 원료의 특성에 따른 조습 성능 등을 평가해 보고자 하였다. 철원 규조토는 형태와 구조가 와해 변질된 상태로 존재하였으며, 포항 벤토나이트는 입자 표면이만곡 현상(彎曲 現狀)과 많은 기공을 관찰할 수 있었다. 제올라이트는 타원형 또는 구형의 형태를 가지고 있으며, 다수의 판상 입자들이 한개의 거대 입자(15$\mu$m 전후)를 형성하는 특징이 있었다. 또한 대부분의 원료들은 판상이거나 침상으로 다공질의 미세구조를 관찰할 수 있었다. 각 원료를 사용해 제조한 조습패널은 다공성 원료의 첨가로 인해 다공성 원료를 혼합하지 않은 패널 보다 수분의 흡방습 특성은 크게 개선되어, 포항 제올라이트 10% 패널의 경우에는 흡습량 180g/m$^2$, 방습량 105g/m$^2$ 수준이었다. 또한 패널의 비표면적 및 기공 부피와 수분 흡방습량과의 높은 상관성이 있음을 확인하였다. 또한 다공성 원료의 종류에 따라서도 패널의 수분 흡방습량은 차이가 있었으며, 이는 다공성 원료의 영향으로 판단되었다. 이때 철원 규조토를 10% 첨가한 패널의 수분 흡습량은 170g/m$^2$ 정도 였으며, 포항 제올라이트를 10% 첨가한 패널의 수분 흡습량은 180g/m$^2$, 방습량은 105g/m$^2$ 로 다공성 원료를 혼합하지 않은 패널(흡/방습량:80/40g/m$^2$) 보다 매우 우수한 흡방습능을 나타내었다.

• 한국식품과학회지
• /
• 제31권1호
• /
• pp.164-170
• /
• 1999

저장 중 쌀의 수분이동에 따른 균열현상을 구명하고 균열을 발생시키는 임계조건을 산출하여 이를 토대로 쌀의 균열을 방지할 수 있는 저장조건을 확립하였다. 쌀의 평형상대습도와 노출된 환경의 상대습도의 차이$({\Delta}ERH)$가 적을 때는 균열이 발생하지 않은 반면, 그 차이가 임계치보다 클 때는 균열이 발생하였으며 균열의 발생정도는 쌀의 평형상대습도와 환경의 상대습도의 차이가 클수록 심하게 나타났다. 탈습환경 하에서는 불규칙한 형상의 균열이 쌀알의 외부에 발생하였으며 흡습환경 하에는 규칙적인 형상의 균열이 쌀알의 내부에 축방향과 수직방향으로 방사상으로 발생하였다. 노출시간별 균열발생 패턴을 Weibull함수에 의거하여 해석한 결과, ${\Delta}ERH$가 클수록 균열속도상수가 증가하였다. 동할미 발생률은 In$({\Delta}ERH)$에 따라 직선적으로 증가하였으며, 임계 균열발생 상대 습도차(critical crack-inducing ${\Delta}ERH$)는 탈습시 $11.3{\sim}16.4%$, 흡습시 $10.8{\sim}17.1%$의 값을 보였다. 실험결과를 토대로 수분함량 및 수분활성도 별 쌀의 안전저장 상대습도를 나타내는 diagram을 제시하였다.

• Journal of the Korean Wood Science and Technology
• /
• 제24권1호
• /
• pp.75-80
• /
• 1996

The purpose of this study is to clarify the mechanism of moisture transfer depend on the thickness of the spruce(Picea sitchensis Carr.). Therefore, as the basic research of moisture transmission, the amount of moisture transmission and the moisture distribution in specimens and temperature of it's surfaces in vapor transmission process were investigated. The experiment was conducted in a steady state. and the moisture distribution was measured by knife cutting and weighing the specimens. The following conclusions were obtained ; 1. It can be found that distribution of moisture in the specimen can be approximated by two different straight lines intersecting at nine or ten percent moisture content. The amount of moisture movement defends on the gradient of moisture in the wood. 2. It is investigated that the wood surface moisture contents(MCs) are less for thinner specimens than for thick ones on the absorption side. On the other hand, the wood surface MCs are greater for thinner specimens than for thick ones on the desorption side. The main factor that affects the EMC of wood would be temperature when the relative humidity of atmosphere is constant. The specimen generate heat with the absorption and desorption process. In addition, the velocities of moisture transmission varied with the thicknesses of specimens. If the temperature of wood becomes greater, its MC decreases. Then the difference between surface MC and EMC of adsorption and desorption side becomes greater for thinner specimens. Therefore it is considered that the coefficients of moisture transfer decreases with the increases of the specimens' thicknesses.

• KIEAE Journal
• /
• 제12권5호
• /
• pp.71-76
• /
• 2012

As reviewed of developments of Korean earth architecture, earth-made buildings have been dwindled gradually since "the new community movement" and earth have been recognized as materials which are not so good to human health and in result, earth-related techniques have been also forgotten. However, recently the earth architecture has been more attracting back many attentions thanks to the people who are interested in health and wellbeing and the earth related techniques or skills got keenly required. The present study has investigated and reproduced earth finishing materials which are based on natural materials as basic stuffs to use them as the finishing materials of the modern earth architecture. For the test, the finishing materials have been divided roughly into sorts of pastes and oils. In case of applying finishing materials onto earth surfaces, the moisture permeability test was conducted to measure a water-absorbing speed, and at the case of using finishing materials for interior works moisture adsorption/desorption test was performed to verify the indoor humidity regulation ability, and further a test to check whether to be stained when contacted with the finishing materials, was conducted. If there is not any stain it might be recognized to be high quality of moisture adsorption/desorption and so seaweed pastes or starches might be used for paste finishing materials and for natural oils, beans are desirable in practical ways. As low-quantity of moisture adsorption materials, linseed oil is most desirable and also beaned water over75% are thought to be useful.