• 한국가스학회지
• /
• 제12권3호
• /
• pp.81-84
• /
• 2008

본 연구는 현재 상용화를 추진중인 Propane-DME(dimethyl ether) 혼합가스를 가정용 가스레인지에 적용하였을 경우 각 버너에서의 열효율 특성이 KS 기준에 부합되는지를 알아보기 위하여 국내 4개사의 가정용 가스레인지를 대상으로 Propane 100%인 가스와 Propane-DME 혼합비율이 $80%{\sim}20%$(wt.%)인 혼합 가스에 대하여 실험을 수행하였다. 실험결과, DME의 발열량이 낮아 DME 혼합비율이 높아질수록 열효율은 감소하는 것을 알 수 있었다. 또한, 4개사 중 1개사의 제품은 Propane-DME 혼합비율이 $80%{\sim}20%$(wt.%)인 혼합가스를 사용하였을 경우 열효율이 KS 기준인 40%에 미치지 못하는 것으로 나타났다. 이에, Propane-DME 혼합비율이 $80%{\sim}20%$(wt.%)인 혼합가스를 가정용 가스레인지에 적용하기 위해서는 적정한 기준개발이 요구된다.

• 설비공학논문집
• /
• 제27권9호
• /
• pp.455-462
• /
• 2015

Residential buildings account for a significant portion of the total building-energy usage in Korea, and a variety of research studies on the domestic boiler have therefore been carried out; however, most of these studies examined the boiler itself, whereby the part-load ratio characteristics and the corresponding gas-energy consumption patterns were not analyzed. In this study, the part-load ratio and operating characteristics of a domestic gas boiler were analyzed within a residential building equipped with a radiant floor-heating system; in addition, the energy consumption between condensing and conventional boilers was comparatively analyzed. Our results show that significant portions of the total operating hours, heating load, and energy consumption are in the part-load ratio range of 0 through 40%, whereby the energy consumption was significantly affected by the boiler efficiency under low part-load conditions. These results indicate that the part-load operation of a boiler is an important factor in residential buildings; furthermore, replacing a conventional boiler with a condensing boiler can reduce annual gas-energy usage by more than 20%.

• KIEAE Journal
• /
• 제17권5호
• /
• pp.43-50
• /
• 2017

Purpose: Residential cooking(gas or electricity) emits many air pollutants. For Removal of these contaminants, range hood is play an important role in the cooking activities. However, deterioration about performance of range hood can be occur in used range hood which is not verified on performance by testing balancing and adjusting in apartment. So, purpose of this study is to improve the range hood against cooking-generated contaminations. Method: To improve hood, survey of range hood which mounted in apartment have to conduct at first. In this study, the survey was conducted for 3 steps. First, Visual inspection for conditions of range hood. Second, questionnaire of operating and maintenance method. Third, interview with user about need for improvement, complainant. Finally, we integrated the survey for range hood and introduced the probable cause of deterioration through this comprehensive survey. Result: Result of measurement for air volume for range hood, A measured air volume has reduced by 41.4, 38.0, 32.0% each step from rated air volume. There are lots of reasons of this phenomenon including to maintenance, air path of duct, lower-cost devices, exhaust ports. For solve this problem, guideline about operating hood, user in apartment will have to supply with maintenance information at first.

• 한국환경과학회지
• /
• 제13권7호
• /
• pp.645-653
• /
• 2004

Indoor air quality is affected by source strength of pollutants, ventilation rate, decay rate, outdoor level, and so on. Although technologies measuring these factors exist directly, direct measurements of all factors are not always practical in most field studies. The purpose of this study was to develop an alternative method to estimate these factors by application of multiple measurements. For the total duration of 30 days, daily indoor and outdoor $NO_2$ concentrations were measured in 30 houses in Brisbane, Australia, and for 21 days in 40 houses in Seoul, Korea, respectively. Using a box model by mass balance and linear regression analysis, penetration factor (ventilation divided by sum of air exchange rate and deposition constant) and source strength factor (emission rate divided by sum of air exchange rate and deposition constant) were calculated, Sub-sequently, the ventilation and source strength were estimated. In Brisbane, the penetration factors were $0.59\pm0.14$ and they were unaffected by the presence of a gas range. During sampling period, geometric mean of natural ventilation was estimated to be $l.l0\pm1.5l$ ACH, assuming a residential $NO_2$ decay rate of 0.8 hr^{-1}$ in Brisbane. In Seoul, natural ventilation was $1.15\pm1.73$ ACH with residential $NO_2$ decay rate of 0.94 hr^{-1}$ Source strength of $NO_2$ in the houses with gas range $(12.7\pm9.8$ ppb/hr) were significantly higher than those in houses with an electric range $(2.8\pm2,6$ ppb/hr) in Brisbane. In Seoul, source strength in the houses with gas range were $l6.8\pm8.2$ ppb/hr. Conclusively, indoor air quality using box model by mass balance was effectively characterized.

• 한국소음진동공학회논문집
• /
• 제16권9호
• /
• pp.964-970
• /
• 2006

Micro gas turbine(MGT) has received attention recently as small-scale distributed power sources. With characteristics such as their small size, lightweight, low maintenance cost and minimal vibrations during operation, they are expected to become widespread in a wide range of ' applications, including residential and small-scale industrial use. It is very easier to start-up and stop the MGT system which is the friendly environmental power system has just below the 9ppm NOx emmission and good quality of noise level. The exhaust heat emitted by the MGT is in the form of about $300^{\circ}C$ clean exhaust gas. The exhaust gas is suitable for absorption chiller/heater system. 1 has researched performance characteristics of the 60 kW class MGT-absorption chiller-heater system in the local condition. Variations of heat recovery from exhaust gas has measured according to micro gas turbine output of 15, 30, 45, 60kW. From those results, the performance of the MGT-absorption chiller/heater system has been evaluated.

• 대한안전경영과학회지
• /
• 제14권1호
• /
• pp.65-73
• /
• 2012

We studied the risk analysis of fire and explosion caused by gas leak in underground-parking of gas vehicle. However, an entrance regulation of gas vehicles (H2/LPG/CNG etc.) to underground garages has not been enacted in Korea. Incase, a gas explodes in an underground parking garage placed in overcrowded residential area, such as an apartment, the scale of the damage would cause tremendous disaster. Faults of vehicle parts and management problems were evaluated by using the Failure mode and effect analysis (FMEA), which is a qualitative analysis method. The range of the damaged area by the explosion and the damage scale by the explosion pressure were analyzed by using the process hazard analysis software tool (PHAST). The study is expected to facilitate enactment of the regulation for the underground parking to restrict the gas vehicle.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2002년도 하계학술대회 논문집 Vol.3 No.2
• /
• pp.773-777
• /
• 2002

In this study, we analyzed the LPG and LNG sensitivity measurement and voltage variation using catalytic type gas sensor characteristics in catalytic combustion type gas detecter sensors. gas detector shall operate as intended when exposed for 24 hours to air having a relative humidity of 0~85 percent at a temperature of $20[{\mu}m]$ and humidity of 45 percent at a temperature of $-10{\sim}40[^{\circ}C]$ the gas detecter sensors are to be subjected to operation for 210 days in an area that has been detemined to be equivalent to a typical residential atmosphere with an air velocity of 50 [cm/sec]. The source of energy for a gas detector sensors employing a supplementary basic circuit is energized from a separate source of supply direct applied voltage 2.1[V], 2.2[V], 2.3[V]. As a result, it was confirmed that the relative humidity and temperature by regression each analysis, compared to the LPG characteristic graph and methane characteristics graph by a relative humidity of 0 ~ 85 [%] at a temperature range of $-10{\sim}40[^{\circ}C]$ show a similar linear pattern on the whore.

• 한국실내디자인학회논문집
• /
• 제38호
• /
• pp.250-257
• /
• 2003

The purpose of this study is to analyze the varying characteristic factors for residential kitchen remodeling according to contemporary life style. The subjects of this investigation are collected through questionnaire from adult residents who live in Seoul, Korea. The collected cases are analyzed by using Spss-win. By using the vaimax method on the basis of factor analysis, the satisfaction of the actual conditions is under the influence of finished materials & function, sanitary installation, layout, cooling & heating apparatus, day lighting, air conditioning, and safety. The preference of kitchen remodeling Is affected by finished materials, function, environmental equipment, and air conditioning. The Need of kitchen facility is caused by working table, refrigerator, gas range, dish apparatus, and addition function.

• 한국수소및신에너지학회논문집
• /
• 제17권3호
• /
• pp.293-300
• /
• 2006

KIER has been developing a Ru-based preferential oxidation catalysts and a novel fuel processing system to provide hydrogen rich gas to residential PEMFCs system. The catalytic activity of Ru-based catalysts was investigated at different Ru loading amount and different support structure. The obtained result indicated that 2 wt% loaded Ru-based catalyst supported on ${\alpha}-Al_2O_3$ showed high activity in low temperature range and suppressed the methanation reaction. The developed prototype fuel processor showed thermal efficiency of 78% as a HHV basis with methane conversion of 92%. CO concentration below 10 ppm in the produced gas is achieved with separate preferential oxidation unit under the condition of $[O_2]/[CO]=2.0$. The partial load operation have been carried out to test the performance of fuel processor from 40% to 80% load, showing stable methane conversion and CO concentration below 10 ppm. The durability test for the daily start-stop and 8 h operation procedure is under investigation and shows no deterioration of its performance after 50 start-stop cycles. In addition to the system design and development.

• 한국가스학회지
• /
• 제26권4호
• /
• pp.27-35
• /
• 2022

LPG는 공기보다 무거워 지표면으로 가라앉는 특징이 있으며, 주변 공기가 체류하는 경우 증기운을 형성하기 쉬워 가스 누출로 인한 피해가 가중될 우려가 있다. 그러므로 증기운 형성에 따른 주변 지역의 영향 범위분석을 통해 피해를 예방할 필요가 있다. 본 연구에서는 LPG 공급 관리소가 설치된 제주 하가리 일대를 대상으로 토지이용 현황과 지형적 특성으로 생성되는 야간 시간대의 찬공기 흐름과 그에 따른 LPG 누출 특성을 고려하여 주변 지역으로의 피해 영향 범위를 분석하였다. KLAM_21을 활용하여 찬공기 흐름을 분석한 결과, 지형 영향으로 인해 남동쪽에서 약 2 m/s의 찬공기가 유입되었다. LPG 누출 특성은 ALOHA를 이용하였으며 찬공기 흐름을 고려하여 분석하였다. 풍속 2 m/s 조건에서 누출공 크기가 10 cm일 때 LEL 60 %(12,600 ppm)에 해당하는 범위는 61 m로 나타났으며 LPG 누출 시 증기운에 의한 화재 등의 사고가 발생하는 경우 누출원으로부터 50 m 부근에 위치한 인근 주거지에 피해가 미칠 것으로 예상되므로 사고 예방을 위한 대안책이 요구된다. 해당 연구결과는 LPG 누출로 인한 사고 발생 시 예방책을 마련하는데 기초 자료로 활용될 수 있으며 FLACS와 같은 CFD 모델링을 통해 비교적 좁은 영역에서의 LPG 누출 형상 및 증기운으로 인한 피해 영향 범위를 확인할 필요가 있다.