• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.15 no.12
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• pp.1070-1077
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• 2003

This study was undertaken to judge the quality of air-tightened exhibition cases and to predict the dynamic variation of the relative humidity in the showcase. We performed a lot of experiments for the a few conditions and we numerically calculated the air change rate and the relative humidity in the showcase with the Artsorb under the same conditions. In all cases we confirmed that the numerical results about the relative humidity in the showcase had a good agreement with the experimental ones. Through the experiments of humidity control, we found out that the adsorption efficiency is varied with the location and the amount of the Artsorb. And the numerical results showed that the adsorption material is always needed to keep on the appropriate humidity condition in the showcase even though any kind of the showcases are used.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.18 no.2
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• pp.115-121
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• 2008

In winter season, the survey was performed in three commercial office buildings in the metropolitan Seoul, Pusan, and Gwangju city. The purpose of the survey was to evaluate the effectiveness of ventilation for offices in commercial buildings. The data were compared to standard of applicable to the indoor ventilation in office. The results indicated that the most commercial office buildings used the air handing unit and fan coil unit as HVAC system, and the intake amount of fresh outdoor air were very inadequate to compared to the ASHRAE standard value of $0.57\;m^3/min/person$. Also the surveyed all commercial office building used the HVAC system as a meas of controlling temperature for office indoor air. Ultimately, these results presented that there were possibility of evoking indoor air quality problems by the insufficient ventilation.

• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.8
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• pp.2099-2109
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• 1993

A gas-fired 4RT absorption heat pump was designed as an air-conditioner for domestic use during the summer. The absorption heat pump is air-cooled. double-effect, $LiBr-H_{2}O$ system with parallel flow type. The performance of the absorption heat pump in the cooling mode of operation was investigated through cycle modeling and simulation to obtain the system characteristics with parameter changes. System parameters considered in this analysis were the inlet temperature of cooling air to the absorber, the working solution concentrations, the ratio of the amount of the weak solution from the absorber, and the LTD's of each heat exchange component. The optimum designs and operating conditions were determined based on the operating constraints and the coefficient of performance.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2006.11a
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• pp.301-305
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• 2006

An electrical bill is one of the various factors that influence on energy use of residents. This study focused on electrical bills and searched that whether electrical bills affect resident behavior of operating air conditioner and their controlled indoor climate. We surveyed two groups for field study ; the one is residents who live in a studio apartment in Seoul and they are charged for electric as energy consumption they used, and the other is residents who live in a university dormitory and they are not charged for their energy consumption. We measured how long they used the air conditioner for cooling, on/off temperature of air conditioner and room temperature for these two groups. Residents were interviewed about their cooling needs, decisions about when to turn on their air conditioner and so on. We found that dormitory group has much amount of time used the air conditioner than studio apartment group and there are differences of room temperature between two groups when they turn on or off air conditioner. The result shows that perception of money affects resident behavior of operating air conditioner and their acceptable thermal range.

• Journal of Advanced Marine Engineering and Technology
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• v.32 no.8
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• pp.1164-1169
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• 2008

The miniaturization of the Air Handling Unit (AHU) has become an actual need because of the restriction of the using space on the vessel. In modern AHU’s construction, in which the fan section is at the end part of the ship, it’s very difficult to select a suitable capacity of evaporators, because the fan motor emits heat. Thus, the AHU structure has been changed as the fan section has been set before the cooling coil to get temperature values similar to the designed amount. Also, the air guider is installed in order to maintain equal air distribution after it passed the fan section. So, it is possible for air to equally pass the cooling coil. It is investigated three different geometries to find the best performance. Also, It is compared with the numerical and experimental results. The study found the case 3 gives the best results. The results of this study show the possible application of the new design.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.4
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• pp.1568-1575
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• 2013

There has been an increasing interest in the market of vehicle maintenance and repair equipments to decrease air pollution. However, most of the existing air conditioning system equipment in Korea have poor performance as well as non-protection against air pollution. The purpose of this paper is to develop the monitoring technology of recovering and recharging refrigerant for air conditioning system, and also to develop its related diagnostic system. This technology and system can supply the exact amount of refrigerant from the charger to the air conditioning system by precisely diagnosing and monitoring their statuses. This technology can also control recovering and recharging of refrigerant exactly by altering the recovering pressures of refrigerant according to circumstance temperatures.

• Proceedings of the Korean Environmental Health Society Conference
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• 2004.12a
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• pp.12-14
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• 2004

Objective to know about pollution of ventilated system in super market and hotel's air condition in Kunming. Methods to take out 28 ventilated system from super markets and hotels in Kunming in march 2004. To check dirt amount in pipelines and microorganism in dirt. Testing result is appraised under 'Public hygiene standard of ventilated system in air condition'. Results pollution problem exist in different degree in all the super markets and hotels that have been investigated. There is 32.14% which means 8 hotels and 1 super market, pollution is serious, The others (67.86%) is medium. Conclusion pollution problems exist in air condition system in all super markets and hotels of Kunming. Discussion aim at Kunming's special weather, and present condition of public ventilated system, discussing ways of management in hygiene of air condition system.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.11a
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• pp.43-46
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• 2003

The economy of I.R.Iran is so related to oil that has had many environmental problems especially air pollution in urban areas in recent years. Statistics show that most of the time, the condition of air quality is in crisis level especially during fall and winter seasons. Rapid and high population growth has had large amount of fossil fuels consumption in all sectors including transportation, industry, agriculture, residential and commercial and public services and air pollution and healthy problems. Iran＇s abundance of fossil fuel resources has tended to discourage the country＇s incentive to shift to cleaner alternative energy sources for its energy needs that must be considered in future programming. These are discussed in this paper.

• The Korean Journal of Ecology
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• v.21 no.3
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• pp.195-201
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• 1998

This study was carried out to investigate characteristic of ions in rainwater by throughfall, stemflow and rainfall at air polluted area(Kure city industrial city) and non-air polluted area (Higashihiroshima city non industrial city). pH of rainwater in air polluted area were all low as compared with those in non-air polluted area. EC of rainwater in ir polluted area were high in throughfall and stemflow, but there was no difference between both areas in rainfall. The concentration of major ions in rainwater were generally high at air polluted area, especially of $Mg^{2+}$, $Ca^{2+}$, $Cl^{-}$ and $SO_4^{2-}$ in stemflow. But there was little difference in $NH_4^{+}$, and there was also cases had a high concentration in non-air polluted area. By comparison with forest type, in stemflow concentration of ions in coniferous forest were higher than those in broad-leaved, but in throughfall they were higher in mixed forest rather than coniferous forest. There was no correlation between the amount of rainwater and pH, and also EC. $NO_4^{-}$ and $SO_{4}^{2-}$ had high correlations between major ions besides $Na^{+}$ and $NH_{4}^{+}$ in air poluted area.

• Fire Science and Engineering
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• v.24 no.6
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• pp.20-27
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• 2010

In smoke control systems the amount of air supply is almost the same as that of smoke exhaust. This study analyzed the effect of supply air velocity on the smoke exhaust behavior using FDS tool. The results showed that fire plume can be disheveled by the rapid air velocities developed when the air supply inlet is located near the fire plume. Disheveled smoke caused the rapid descent of smoke layer level and the reduced visibility. To increase the efficiency of smoke exhaust systems supply air inlet should be located sufficiently far from the location of the fire plume.