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- 저자 : 정송환(Song-Hwan Jeong) (검색결과 4 건)
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지열 히트펌프 시스템의 Exergy 변화를 통한 시스템 효율에 관한 연구
정송환(Song-Hwan Jeong),조광래(Kwang-Rae Joh) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
This study is experimented with device that heat exchanger instead of condenser and evaporator changed dual tubes heat exchanger under heating condition and cooling condition The results with the experimental is that the ratio of Irreversible losses represents that the largest amount of loss is the compressor and the condenser, evaporator, expansion valve in the order. Also, COP of power according to effect of water is confirmed that performance of cooling and heating are improved when ΔTLS is lower the most efficient driving method is that heating is low and cooling is high With this study, It is found that to select a higher reduces power consumption and generate maximum calorie under cooling.
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질소용기의 압력을 이용한 수도배관 세척시스템 효율화 방안 연구
정송환(Song-Hwan Jeong),전연자(Ioun-Ja Jeon) 산업기술교육훈련학회 2014 산업기술연구논문지 (JITR) Vol.19 No.3
In this study, using a pressure of nitrogen vessel was to seek more efficient cleaning system of water pipe. Scale, sludge and rust are generated inside of pipe depending on years of pipe used, frequency of use, the kind of pipes. It was studied the experiment of aging pipe(more 10years) for the cleaning and process of the efficient water pipe cleaning system. In this study, selected nitrogen in order to remove foreign matter because it is inert gas contact with the air and water is not a chemical reaction. In addition to it is not danger of corrosion and explosion, and possible to ensure safety on pipe rupture. The injection pressure of the cleaning water pipes is 35∼40kg/㎠ at a constant pressure and was performed repeatedly 3~4 times. As a result, it was obtained the effect of cleaning more than 80% sludge, rust, scale of the aging pipe. These cleaning methods have been tried for the first time in this country. In addition, according to this study could find the possible to the cleaning house pipe of less than 20years. But in the case of apartments and villas with over 25years overall is low use the water, so a lot of rust in the pipe line co-occurrence of the cleaning effects of the pipe was found to be falling. Therefore if a minimum of 10 cleaning-year cycle will be very effective. In this study, using a pressure of nitrogen vessel through the pipe cleaning system equipment’ to complement the problems of the practical efficiency has been to increase the level of performance.
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수도배관의 신기술세척시스템에서 고압질소가 배관내에 미치는 화학작용 및 고압력 세척효과 연구
정송환(Song-Hwan Jeong),전훈(Hoon-Jun) 산업기술교육훈련학회 2015 산업기술연구논문지 (JITR) Vol.20 No.1
Scale is generated by foreign matter stuck to the inner wall of the pipe by various phenomena arising from the water pipe. These scales, it is solidified after a long time, causing to narrow the flow path of the pipe. Various techniques associated with the foreign substance removal inside these pipes have been proposed, but had no effect. Just be generated only leak, the need for cleaning of the other methods have been requested. In this study, the present invention relates to new technology is a high-pressure nitrogen in the cleaning system is on the inside of the pipe at the time of the cleaning effect of chemistry and high-pressure washing of water piping. Safety, impact pressure, cleaning efficiency such as a result of the experiment, high pressure nitrogen(3.0MPa(35 ) is hight by disruption and the point type when introduced into the pipe, rust, cleaning effect of the chemical action of the sludge are rapid freezing phenomenon XL, PB pipe 96 %, copper 90%, steel pipe 85%. Although air leakage occurs at approximately 1.0 MPa, nitrogen safety no leakage occurs even 3.5 MPa was demonstrated. In addition, the effect of the pressure of the length of the pipe cleaning is on, the pressure is transmitted to the first and last part, was a very effective system for high pressure cleaning.
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정창호,이원재,배송환,최성길,Jeong, Chang-Ho,Lee, Won-Jae,Bae, Song-Hwan,Choi, Sung-Gil 한국식품영양과학회 2007 한국식품영양과학회지 Vol.36 No.7
한국산 골드키위를 기능성 식품 재료 및 가공품을 개발하기 위한 기초자료로 활용하기 위하여 화학성분 및 항산화활성을 조사하였다. 골드키위의 pH 4.43${\pm}$0.16, 당도 17.01${\pm}$0.04$^{\circ}Brix$ 및 총산도 0.82${\pm}$0.02%이었으며, L값 49.80${\pm}$0.24, a값 -6.79${\pm}$0.02 및 b값 19.72${\pm}$0.18로 나타났다 일반성분은 수분 78.62${\pm}$2.26%, 조단백 1.34${\pm}$0.25%, 조지방 0.70${\pm}$0.06%, 조섬유 1.99${\pm}$0.13%, 조회분 0.99${\pm}$0.26% 및 가용성 무질소물 16.36${\pm}$1.23%이었다. 무기성분은 Na, Ca 및 K으로 그 함량은 각각 21.50${\pm}$1.58 mg%, 23.84${\pm}$2.10 mg% 및 265.86${\pm}$5.00 mg%였다. 골드키위에 함유되어 있는 유리당으로는 sucrose(1.04${\pm}$0.18%), glucose(2.17${\pm}$0.21%) 및 fructose(1.86${\pm}$0.11%)였으며, 가장 많이 함유되어 있는 아미노산은 glutamic acid(86.51${\pm}$5.58 mg%)였고, 가장 낮은 아미노산으로는 tyrosine(15.00${\pm}$4.91 mg%)이었다. 유기산은 quinic acid(6.65${\pm}$0.21 mg/g), malic acid(1.62${\pm}$0.13 mg/g) 및 citric acid(4.82${\pm}$0.21 mg/g)가 함유되어 있었으며, 비타민 C 함량과 총페놀 함량은 각각 0.27${\pm}$0.06 mg/g 및 0.047${\pm}$0.002 mg/g이었다. 골드키위 물추출물 농도 25 mg/mL일 때 86.87%의 DPPH radical 소거활성을 보였으며, 환원력은 1.96으로 나타났고, linoleic acid를 이용한 지질과산화 억제활성은 농도의존적인 경향을 보였다. The chemical components and antioxidative activity of Korean gold kiwifruit were investigated. The values of pH, soluble solid and total acidity were 4.43${\pm}$0.16, 17.01${\pm}$0.04$^{\circ}Brix$, and 0.082${\pm}$0.02%, respectively. Hunter L, a, and b values were 49.80${\pm}$0.24, -6.79${\pm}$0.02, and 19.72${\pm}$0.18 value, respectively. Proximate compositions were as follows; moisture 78.62${\pm}$2.26%, crude protein 1.34${\pm}$0.25%, crude lipid 0.70${\pm}$0.06%, crude fiber 1.99${\pm}$0.13%, crude ash 0.99${\pm}$0.26%, and carbohydrate 16.36${\pm}$1.23%, respectively. Mineral elements were K 265.86${\pm}$5.00, P 71.82${\pm}$29.18, and Ca 23.84${\pm}$2.10 mg%, respectively. Free sugar compositions were sucrose (1.04${\pm}$0.18%), glucose (2.17${\pm}$0.21%) and fructose (1.86${\pm}$0.11%). Amino acid contents of Korean gold kiwifruit was very rich in glutamic acid 86.51 ${\pm}$5.58 mg/100 g and deficient in tyrosine 15.00${\pm}$4.91 mg/100 g. Organic acid compositions were quinic acid (6.65${\pm}$0.21 mg/g), malic acid (1.62${\pm}$0.13 mg/g) and citric acid (4.82${\pm}$0.21 mg/g). Contents of ascorbic acid and total phenols were 0.27${\pm}$0.06 mg/g and 0.047${\pm}$0.002 mg/g, respectively. The DPPH radical scavenging activity and reducing power of the water extract from Korean gold kiwifruit was 86.87% and 1.96 at a concentration of 25 mg/mL. The water extract showed considerable antioxidative activity against linoleic acid autoxidation in a dose-dependent manner.
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