• Title/Summary/Keyword: discharge flow rate

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Solubility Consideration in Performance Analysis of a $CO_2$ Twin Rotary Compressor (오일 용해도를 고려한 $CO_2$ 트윈 로타리 압축기 성능해석)

  • Kim, Woo-Young;Ahn, Jong-Min;Kim, Hyun-Jin;Cho, Sung-Oug
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.12
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    • pp.842-849
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    • 2007
  • For a $CO_2$ two-stage twin rotary compressor used for heat pump water heater system, changes of $CO_2$ solubility in PAG oil were investigated along the gas passages from the first stage suction to final discharge. Only slight changes in solubility took place in suction chambers for both of the first and second stages, but for compression chambers, solubility variation ranged from 0.115 to 0.136, and from 0.133 to 0.182, respectively for the first and second stages. Calculation of gas flashing in parts of leakage oil flows and of oil contained in control volumes due to solubility changes was conducted and included in gas pressure calculation. For the second stage, gas flashing amounts to around $5%\sim6%$ for most leakage flows. Cooling capacity, compressor input, and COP obtained by calculation were well compared to the experimental results. Effects of operation speed on the compressor performance was also studied: as the shaft speed increased, adiabatic efficiency decreased rapidly due to increased over-compression loss.

Study on the Generation of Chemically Active Species Using Gas-liquid Mixing Plasma Discharging System (기-액 혼합 플라즈마 방전 시스템에서 화학적 활성종의 생성)

  • Kim, DongSeog;Park, YoungSeek
    • Journal of Korean Society on Water Environment
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    • v.30 no.4
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    • pp.394-402
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    • 2014
  • High-voltage dielectric discharges are an emerging technique in environmental pollutant degradation, which are characterized by the production of hydroxyl radicals as the primary degradation species. The initiation and propagation of the electrical discharges depends on several physical, chemical, and electrical parameters such as 1st and 2nd voltage of power, gas supply, conductivity and pH. These parameters also influence the physical and chemical characteristics of the discharges, including the production of reactive species such as OH, $H_2O_2$ and $O_3$. The experimental results showed that the optimum 1st voltage and oxygen flow rate for RNO (N-Dimethyl-4-nitrosoaniline, indicator of the generation of OH radical) degradation were 160 V (2nd voltage of is 15 kV) and 4 L/min, respectively. As the 2nd voltage (4 kV to 15 kV) was increase, RNO degradation was increased and, generated $H_2O_2$ and $O_3$ concentration were increased. The conductivity of the solution was not influencing the RNO degradation, $H_2O_2$ and $O_3$ generation. The pH effect on RNO degradation was not high. However, the lower pH and the conductivity, the higher $H_2O_2$ and $O_3$ generation were observed.

Development of Road Tunnel Ventilation System with Electrostatic Precipitator (도로터널용 전기집진시스템 개발)

  • Kim, Jong-Ryul;Weon, Jong-Oung
    • Proceedings of the SAREK Conference
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    • 2008.11a
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    • pp.80-83
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    • 2008
  • As SOC (Social Overhead Capital) has been expanded, the highway road construction has been accelerated and city road system has been more complicated. So, long road tunnels have been increased and traffic flow rate also has been raised. Accordingly, the exhausting gas of vehicle cars seriously deteriorates the tunnel inside air quality and driving view. In order to improve tunnel inside air quality, we may need to introduce a compulsory ventilation system as well as natural ventilation mechanism. The natural ventilation mechanism is enough for short tunnels, meanwhile longer tunnels require a specific compulsory ventilation facility. Many foreign countries already have been devoting on development of effective tunnel ventilation system and especially, some European nations and Japan have already applied their developed tunnel ventilation system for longer road tunnels. More recently, as the quality of life improved, our concerns about safety of driving and better driving environment have been increased. In order to obtain clearer and longer driving view, we are more interested in EP tunnel ventilation system in order to remove floating contaminants and automobile exhaust gas. Evan though it's been a long time since many European countries and Japan applied more economical and environment-friendly tunnel ventilation system with their self-developed Electrostatic Precipitator, we are still dependant on imported system from foreign nations. Therefore, we need to develop our unique technical know-how for optimum design tools through validity investigation and continuous possibility examination, eventually in order to localize the tunnel ventilation system technology. In this project, we will manufacture test-run products to examine the performance of system in order to develop main parts of tunnel ventilation system such as electrostatic precipitator, high voltage power generator, water treatment system, etc.

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Water Quality Modeling for Environmental Management in Chinhae.Masan Bay (진해.마산만의 환경관리를 위한 수질모델링)

  • 조흥연;채장원
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.11 no.1
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    • pp.41-49
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    • 1999
  • The horizontal two-dimensional model which can predict the long-term water quality(WQ) change is setup for the environmental management. For the model calibration and verification, we measured the pollutants load at 22 streams and the WQ at 16 stations monthly and/or seasonally in Chinhae . Masan Bay. The pollutants release rate from the sediment was also measured to consider the regionally different sediment pollution level. From the model application results, it is shown that the WQ concentrations in most of the regions adjacent to land and river inflow are considerably high, but rapidly decrease along the seaward direction. In Masan Bay, the particulate inflow-pollutants were substantially deposited and gradually contaminated the bottom sediment on account of the excessive pollutants load and flow stagnancy. Eutrophication in the effluent discharge region was also being slowly progressed by the inefficiently treated wastewater containing amount of Nand P constituents.

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Evaluation of the Irrigation Water Supply of Agricultural Reservoir Based on Measurement Information from Irrigation Canal (수로부 계측정보 기반 농업용 저수지의 관개용수 공급량 평가)

  • Lee, Jaenam;Noh, Jaekyoung;Kang, Munsung;Shin, Hyungjin
    • Journal of The Korean Society of Agricultural Engineers
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    • v.62 no.6
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    • pp.63-72
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    • 2020
  • With the implementation of integrated water management policies, the need for information sharing with respect to agricultural water use has increased, necessitating the quantification of irrigation water supply using monitoring data. This study aims to estimate the irrigation water supply amount based on the relationship between the water level and irrigation canal discharge, and evaluate the reliability of monitoring data for irrigation water supply in terms of hydrology. We conducted a flow survey in a canal and reviewed the applicability of the rating curve based on the exponential and parabolic curves. We evaluated the reliability of the monitoring data using a reservoir water balance analysis and compared the calculated results of the supply quantity in terms of the reservoir water reduction rate. We secured 26 readings of measurement data by varying the water levels within 80% of the canal height through water level control. The exponential rating curve in the irrigation canal was found to be more suitable than the parabolic curve. The irrigation water supplied was less than 9.3-28% of the net irrigation water from 2017 to 2019. Analysis of the reservoir water balance by applying the irrigation water monitoring data revealed that the estimation of the irrigation water supply was reliable. The results of this study are expected to be used in establishing an evaluation process for quantifying the irrigation water supply by using measurement information from irrigation canals in agricultural reservoirs.

Properties of AlTiN Films Deposited by Cathodic Arc Deposition (음극 아크 증착으로 제조된 AlTiN 박막의 특성)

  • Yang, Ji-Hoon;Kim, Sung-Hwan;Song, Min-A;Jung, Jae-Hun;Jeong, Jae-In
    • Journal of the Korean institute of surface engineering
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    • v.49 no.3
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    • pp.307-315
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    • 2016
  • The properties of AlTiN films by a cathodic arc deposition process have been studied. Oblique angle deposition has been applied to deposit AlTiN films. AlTiN films have been deposited on stainless steel (SUS304) and cemented carbide (WC) at a substrate temperature of $500^{\circ}C$. AlTiN films were analyzed by scanning electron microscopy, glow-discharge light spectroscopy, micro-vickers hardness, and nanoindenter. When applying a current of 50 A to the cathodic arc source, it showed that the density of macroparticle of AlTiN films was 5 lower than other deposition conditions. With the increase of the bias voltage applied to the substrate up to -150 V, the density of macroparticle was decreased. The change of the $N_2$ flow rate during coating process made no influence on the film properties. For the multi-layered films, the film prepared at oblique angle of $60^{\circ}$ showed the highest hardness of 28 GPa and $H^3/E^2$ index of 0.18. AlTiN films have been shown a good oxidation resistance up to $800^{\circ}C$.

Temporal and Spatial Analysis of Water Quality Data Observed from Major Water Quality Stations in Nakdonggang Watershed (낙동강 유역 주요 수질측정지점의 시·공간적 수질특성 분석)

  • Kim, So Rae;Kyung, Jo Hyun;Kim, Sang Min
    • Proceedings of the Korea Water Resources Association Conference
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    • 2017.05a
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    • pp.545-545
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    • 2017
  • The purpose of this study was to analyze the characteristics of water quality and spatial and temporal water quality in Nakdong River basin. Spatial changes of water quality in Nakdong River due to inflow of sewage treatment plant and main tributaries were analyzed. The water quality data were collected from the water environment information system of the National Institute of Environmental Research (NIED) for 8 days interval from 2004 to 2015, and the collected data were analyzed for water quality items (flow rate, BOD, TN, TP). The discharge water quality data of 32 sewage treatment plants were collected from the National Institute of Environmental Research (NIER) nationwide from 2012 to 2015 and arithmetically averaged over the spring and autumn seasons.

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Experimental Study of N2O Plasma Igniter for PMMA Combustion (N2O 플라즈마 점화 하이브리드 로켓에 대한 실험적 연구)

  • Kim, Myoungjin;Kim, Taegyu
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.3
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    • pp.1-8
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    • 2019
  • In this study, Arc plasma was employed for the thermal decomposition of nitrous oxide($N_2O$). Conventional ignition systems such as torch, spark, and catalyst systems, have disadvantages in that they are not reliable and do not provide rapid responses. Therefore, this study suggests the plasma application of plasma to overcome the problems of conventional ignition methods. A gas temperature and combustion experiment was carried out to investigate the feasibility to a novel igniter. The gas temperature was measured around $960^{\circ}C$ at 1 g/s, 0.7 A at the nearest wall. In addition, a combustion test was successfully conducted in 3.1 sec after the plasma discharge was initiated with a main flow rate of 10 g/s. The energy consumption for ignition was 1,780 J(574 W).

Installation and operation of automatic nonpoint pollutant source measurement system for cost-effective monitoring

  • Jeon, Jechan;Choi, Hyeseon;Shin, Dongseok;Kim, Lee-hyung
    • Membrane and Water Treatment
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    • v.10 no.1
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    • pp.99-104
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    • 2019
  • In Korea, nonpoint pollutants have a significant effect on rivers' water quality, and they are discharged in very different ways depending on rainfall events. Therefore, preparing an optimal countermeasure against nonpoint pollutants requires much monitoring. The present study was conducted to help prepare a method for installing an automatic nonpoint pollutant measurement system for the cost-effective monitoring of the effect of nonpoint pollutants on rivers. In the present study, monitoring was performed at six sites of a river passing through an urban area with a basin area of $454.3km^2$. The results showed that monitoring could be performed for a relatively long time interval in the upstream and downstream regions, which are mainly comprised of forests, regardless of the rainfall amount. On the contrary, in the urban region, the monitoring had to be performed at a relatively short time interval each time when the rainfall intensity changed. This was because the flow rate was significantly dependent on the rainfall's intensity. The appropriate sites for installing an automatic measurement system were found to be a site before entering the urban region, a site after passing through the urban region, and the end of a river where the effects of nonpoint pollutant sources can be well-decided. The analysis also showed that the monitoring time should be longer for the rainfall events of a higher rainfall class and for the sites closer to the river end. This is because the rainfall runoff has a longer effect on the river. However, the effect of nonpoint pollutant sources was not significantly different between the upstream and the downstream in the cases of rainfall events over 100 mm.

Assessing Groundwater Vulnerability Using DRASTIC Method and Groundwater Quality in Changwon City (DRASTIC과 지하수 수질에 의한 창원시 지하수 오염취약성 평가)

  • Hamm Se-Yeong;Cheong Jae-Yeol;Kim Moo-Jin;Kim In-Soo;Hwang Han-Seok
    • Economic and Environmental Geology
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    • v.37 no.6 s.169
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    • pp.631-645
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    • 2004
  • This study assesses groundwater vulnerability to contaminants in industrial and residential/commercial areas of the city of Changwon, using DRASTIC technique and groundwater data. The DRASTIC technique was originally applied to situations in which the contamination sources are at the ground surface, and the contaminants flow into the groundwater with infiltration of rainfall. Mostly the industrial area has higher DRASTIC indices than the residential/commercial area. However, a part of the residential/commercial area having much groundwater production and great drawdown is more contaminated in groundwater than other industrial and the residential/commercial areas even if it has lowest DRASTIC indices in the study area. It indicates that groundwater contamination in urban areas can be closely related to excessive pumping resulting in a lowering of the water level. The correlation coefficient between minimum DRASTIC indices and the degree of poor water quality for 10 districts is as low as 0.40. On the other hand, the correlation coefficients between minimum DRASTIC indices and the groundwater discharge rate, and between minimum DRASTIC indices and well distribution density per unit area are 0.70 and 0.87, respectively. Thus, to evaluate the potential of groundwater contamination in urban areas, it is necessary to consider other human-made factors such as groundwater withdrawal rate and well distribution density per unit area as well as the existing seven DRASTIC factors.