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박문수,Park, M.S. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.3
This study investigates the simultanceous heat and mass transfer between a falling desiccant film and air in cross flow at the interface. The application of this work is the optimization of falling film evaporators for use in potential hybrid air conditioning systems. The specific geometry considered is liquid TEG films falling along the vertical cooled surfaces of a channel with air in cross flow. The equations to describe the coupled heat and mass transfer between a falling desiccant film and air in cross flow for a falling film evaporator have been presented and solved numerically. The effects of important design and operating variables on the evaporator performance predicted by the parametric numerical analysis and suggestions for performance improvements of the evaporator are presented.
태양열에 의한 냉방 및 난방시스템의 성능향상(Ⅱ) - 태양열을 이용한 흡수식 냉동기의 성능 -
박문수(M.S.Park),김무근(M.G.Kim),김효경(H.K.Kim),노승탁(S.T.Ro) 대한설비공학회 1989 설비공학 논문집 Vol.1 No.1
The purpose of this study is to obtain the dynamic characteristics of an absorption refrigerator powered by solar energy by experiments. Since the absorption refrigerator power by solar energy should have the characteristics which is suitable for the intermittence and rarity of solar energy, not only the characteristics of the steady state operations but also the partial load and the transient operations should be considered. The minimum available temperature of the storage tank should be known, and the absorption refrigerator can be suitably selected for air-conditioning systems. In this study, the experimental data of the transient state for on-off and warming-up operations has been obtained. Also the experiments are performed which test the minimum available temperature of the storage tank. The results show that it takes 1 hour to get to the steady state of the absorption refrigerator, and the minimum available temperature of the storage tank is about 68℃, and show that in the partial load operations the performance of the absorption refrigerator is improved by applying the modified control method to on-off operations.
초지의 관개효과에 관한 연구 1 . 관개와 질소시비수준이 토양수분장력과 목초의 재생 및 수량에 미치는 영향
서성,박문수,한영춘,이종열 ( S . Seo,M . S . Park,Y . C . Han,J . Y . Lee ) 한국축산학회 1986 한국축산학회지 Vol.28 No.2
Pasture irrigation has been much paid attention to for the increase of forage yield and persistence in dry area. This field experiment was conducted to determine the effects of irrigation and nitrogen(N) fertilization on the soil moisture retention, regrowth and yield of orchardgrass/ladino clover mixtures during the dry season. Irrigation point was 0.5bar, irrigation method was sprinkler system, and N levels (subplot) were 140, 280 and 420 ㎏/㏊. The experiment was performed at Livestock Experiment Station in Suweon, 1985. The results are summarized as follows: 1. Considering the meteorological conditions during the experimental period, the temperature was higher by 0-2℃ than that of average year, and the dry season was prolonged from May 20 to June 26. 2. With irrigation the temperature of soil surface and underground was decreased by 4.4℃ and 1.6℃, respectively. 3. The regrowth plant length, leaf area and dry weight of grasses with irrigation were markedly increased during the dry season. Also under the irrigation condition the regrowth speed was significantly increased with increasing level of N, while that of unirrigated pasture was no differences between the plots of N 280 and N 420 ㎏/㏊. 4. With irrigation dry matter yield (5.9 t/㏊) and fresh yield (35.4 t/㏊) during the dry season (at the second and the third cut) were significantly (P$lt;0.05) increased by 36% and 50%, respectively. 5. Yield of irrigated pasture was rapidly (P$lt;0.05) increased with increasing level of N application. However, that of unirrigated pasture was shown no difference between the plots of N 280 and N 420 ㎏/㏊.
트로틀 앵글 제어에 의한 내연기관의 토오크 및 속도의 비선형 제어
원문철(M.C.Won),강병배(B.B.Kang),박문수(M.S.Park),김태영(T.Y.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
A nonlinear engine torque and speed control algorithm using throttle angle control is developed with an engine load torque estimation algorithm. Three 3-dimensional nonlinear engine maps as a part of the nonlinear control algorithm are obtained from steady state engine dynamometer tests. An electric throttle actuator is developed using a stepper motor and a 8 bit micro-processor. The speed control and external load estimation algorithm are tested via engine speed control experiments, and show good performance enough for using various engine torque and speed control applications.<br/>