• 대한건축학회논문집:계획계
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• 제34권6호
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• pp.15-22
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• 2018

The purpose of this study was to suggest specific evaluation data for heating and DHW energy consumption characteristics through analyzing energy consumption measurement data of gas boiler in Apartment Buildings with individual heating systems. To do this, it was measured both gas flow and electricity for heating and DHW respectively, and then it was analyzed not only characteristics according to energy sources; gas and electricity, but also the effect of various factors on heating and DHW energy consumption. The result of this study were as follows. It was developed the electric energy estimation model of a gas boiler through analysis on patterns by energy sources. And the effective factors for heating and DHW energy consumption were demonstrated as follows: the area for exclusive use, the number of auxiliary heating equipments, the number of occupants, and the number of sanitary fixtures.

• 한국가스학회지
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• 제22권2호
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• pp.29-33
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• 2018

전통시장, 지하상가 등에서는 많은 유동인구가 있고 가스 전기 설비가 동일구내에 설치되어 두 에너지원의 연관성에 의한 사고 가능성이 증대되고 있으며, 이러한 사고를 예방하고 신속 대응하기 위한 방안이 필요하다. 이 연구에서는 위험인자와 관련된 영향인자 센싱을 통해 사고예측을 하는 것을 목표로 한다. 전기적요인의 누설전류, 아크 등과 폭발사고 위험과 관련된 가스누출에 대해 IOT 센서를 통한 사고예방을 할 수 있는 안전관리 플랫폼 개발의 연구이며 이 논문에서는 가스 사고와 관련된 화재위험인자를 고려한 사고예측에 대한 연구내용이다. 이러한 사고위험을 예방하기 위해서 연소기 주위에서의 온도변화 특성 분석을 수행하였고, 이를 고려하여 화재를 예방할 수 있는 사고전조 알고리듬과 관련된 모듈을 개발하였다.

• 한국지열·수열에너지학회논문집
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• 제7권1호
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• pp.65-71
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• 2011

Recently, central and local governments of Korea have established and implemented various energy policies such as making energy map of city level and establishment of environment friendly city plan to materialize low carbon green city. To implement effectively these policies, however, conditions of energy consumption by each administrative district and each usage have to be verified exactly. This study is aimed to suggest a basic data for planing energy policy and energy demand prediction of city level by analyzing energy consumption unit and conditions of city gas by borough and usage in Busan.

• 상하수도학회지
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• 제30권4호
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• pp.459-469
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• 2016

Gas hydrate desalination process is based on a liquid to solid (Gas Hydrate, GH) phase change followed by a physical process to separate the GH from the remaining salty water. The GH based desalination process show 60.5-90% of salt rejection, post treatment like reverse osmosis (RO) process is needed to finally meet the product water quality. In this study, the energy consumption of the GH and RO hybrid system was investigated. The energy consumption of the GH process is based on the cooling and heating of seawater and the heat of GH formation reaction while RO energy consumption is calculated using the product of pressure and flow rate of high pressure pumps used in the process. The relation between minimum energy consumption of RO process and RO recovery depending on GH salt rejection, and (2) energy consumption of electric based GH process can be calculated from the simulation. As a result, energy consumption of GH-RO hybrid system and conventional seawater RO process (with/without enregy recovery device) is compared. Since the energy consumption of GH process is too high, other solution used seawater heat and heat exchanger instead of electric energy is suggested.

• 신재생에너지
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• 제4권2호
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• pp.61-67
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• 2008

The price to import natural gas continues to rise, as well as the rate of its domestic consumption. This research examined the economic feasibility of domestically developing and producing gas hydrate to substitute imported natural gas. Today, the industry still lacks the technology to commercially produce gas hydrate. However, if the gas hydrate is able to be commercially produced domestically and replace imported natural gas, the annual economic benefit for the Republic of Korea would be 211 - 833 USD/ton. Gas hydrate is rated as a high value investment by the gas industry since the potential annual profit can reach over 150USD/ton. The commercial value of gas hydrate development will increase as long as the natural gas market continues to expand and its consumption increase remains steady. With further development of technology, one can anticipate an even higher expected return on the investment.

• Tribology and Lubricants
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• 제25권5호
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• pp.311-317
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• 2009

To satisfy the more severe emission regulation and the demand of higher fuel economy in near future, the combustion pressure and power output of engines is going to be higher. In order to get the reduction of engine emission and the higher power, it is needed the reduction of the tension and width of ring pack. The lower tension ring and the thinner width ring can bring not only the friction reduction between the ring and liner during engine running, but also the adjustment of the blow-by gas and oil consumption by changing in the pressure in the crevice volume and the axial motion of rings togethe with the adjustment of the inter-ring crevice volumes. In this study, by using a developed basic computer proglram that predicts the blow-by gas and oil consumption of engines, it is to be examined how satisfying the level of the blow-by gas and oil consumption as being installed the piston ring pack with thinner width ring and lower tension ring.

• 자원ㆍ환경경제연구
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• 제31권4호
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• pp.597-617
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• 2022

본 연구에서는 1990년부터 2021년까지의 소비기반 온실가스 배출량을 산업부문별로 산정하고, 국가 간 교역으로 인하여 이전되는 온실가스 배출량을 비교하여 한국에 어떤 시사점을 주는지 분석하였다. 결과적으로, 미국, 독일, EU, OECD 등에서 생산기반 배출량과 소비기반 배출량이 동시에 점점 감소되는 것을 확인했다. 한국은 생산기반 배출량이 소비기반 배출량보다 많으며 이는 수출주도 경제 구조 때문으로 확인된다. 이러한 다른 선진국들과 달리 한국은 육로를 통한 에너지 교역이 불가능하기 때문에 한국만의 특징을 고려한 온실가스 저감계획을 수립하는 것이 타당하다고 말할 수 있다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.107-110
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• 2008

The price of natural gas import continues to rise, as well as its domestic consumption rate. This research examined the economic feasibility of domestically developing and producing gas hydrate to substitute imported natural gas. Today, the technology to commercially produce gas hydrate is still lacking; however, if the gas hydrate is able to be commercially produced domestically and replace imported natural gas, the annual economic benefit for the Republic of Korea would be 211 - 833 USD/ton. From the industry's point of view, gas hydrate is a high value investment since one can expect an annual profit of over 150USD/ton. The commercial value of gas hydrate development will increase as long as the natural gas market continues to expand and as the increase of natural gas consumption remains steady. With further development of technology, one can anticipate an even higher expected return on the investment.

• International Journal of Naval Architecture and Ocean Engineering
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• 제10권5호
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• pp.609-616
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• 2018

The cargo handling system, which is composed of a fuel gas supply unit and cargo tank pressure control unit, is the second largest power consumer in a Liquefied Natural Gas (LNG) carrier. Because of recent enhancements in ship efficiency, the surplus boil-off gas that remains after supplying fuel gas for ship propulsion must be reliquefied or burned to regulate the cargo tank pressure. A full or partial liquefaction process can be applied to return the surplus gas to the cargo tank. The purpose of this study is to review the current partial liquefaction process for LNG carriers and develop new processes for reducing power consumption using exergy analysis. The developed partial liquefaction process was also compared with the full liquefaction process applicable to a LNG carrier with a varying boil-off gas composition and varying liquefaction amounts. An exergy analysis showed that the Joule-Thomson valve is the key component needed for improvements to the system, and that the proposed system showed an 8% enhancement relative to the current prevailing system. A comparison of the study results with a partial/full liquefaction process showed that power consumption is strongly affected by the returned liquefied amount.

• 센서학회지
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• 제19권6호
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• pp.462-468
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• 2010

A low power gas sensor with microheater was fabricated by MEMS technology. In order to heat up the gas sensing material to a operating temperature, a platinum(Pt) micro heater was built on to the micromachined Si substrate. The width and gap of microheater were $20\;{\mu}m$ and $4.5\;{\mu}m$, respectively. ZnO nanowhisker arrays were fabricated on a sensor device by hydrothermal method. The sensor device was deposited with ZnO seeds using PLD systems. A 200 ml aqueous solution of 0.1 mol zinc nitrate hexahydrate, 0.1 mol hexamethylenetetramine, and 0.02 mol polyethylenimine was used for growthing ZnO nanowhiskers. The power consumption to heat up the gas sensor to a operating temperature was measured and temperature distribution of sensor was analyzed by a Infrared Thermal Camera. The optimum temperature for highest sensitivity was found to be $250^{\circ}C$ although relatively high(64 %) sensitivity was obtained even at as low as $150^{\circ}C$. The power consumption was 72 mW at $250^{\circ}C$ and was only 25 mW at $150^{\circ}C$.