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폐온수 이용 제 2 종 흡수식 열펌프의 열역학적 설계해석
강병하,김영인,이춘식,Kang, Byung-Ha,Kim, Young-In,Lee, Chun-Sik 대한설비공학회 1985 설비저널 Vol.14 No.4
A computer program for thermal design analysis has been developed to predict the performance of an absorption heat transformer. The effects of temperature boost, cooling water temperature and effectiveness of components on the performance were investigated. Not only the detailed thermodynamic states such as temperatures, concentration of the solution, and mass flow rate at each point of the process but also the heat transfer rate in each component could be easily determined with given input parameters. The system's coefficient of performance (COP) was seen to increase with increased effectiveness of components, decreased temperature boost of hot water, and decreased cooling water temperature. Even though the COP increases with increased effectiveness of the components, the variation in the COP is not substantial above certain values of the effectiveness. A reference design point can be selected on this basis.
폴리머-계면활성제 콤플렉스의 물성 조절을 통한 샴푸 사용감 최적화
강병하 ( Byung-ha Kang ),배우리 ( Woo-ri Bae ),박민선 ( Min-sun Park ),이기현 ( Key-hyun Lee ),이존환 ( Jon-hwan Lee ),한상훈 ( Sang-hoon Han ) 대한화장품학회 2010 대한화장품학회지 Vol.36 No.2
본 연구에서는 샴푸에 널리 사용되는 양이온성 폴리머 중, 양이온성 구아 폴리머를 선택적으로 사용하여, 다양한 성능평가를 통해 0.7 % 질소함량 이상의 치환도와 190 ~ 200 cps사이의 점도를 가지는 새로운 양이온성 구아 폴리머를 개발하였다. 성능평가로는 헹굼 시 모발 부드러움(Wet combing ability), 폴리머의 잔존정도와 실리콘의 흡착정도를 측정하였으며 최종적으로 관능평가를 실시하였다. 본 연구에서 개발된 양이온성 구아 폴리머를 배합하면 샴푸 사용감을 최적화할 수 있을 것이다. In this study, cationic guar polymer was selected from many cationic polymers currently using in shampoo and then was newly developed having 0.7 % above of nitrogen content and 190 ~ 200 cps of viscosity through various performance measurements. Wet combing ability, polymer substantivity, silicone deposition and panel test were evaluated for performance measurements. Cationic guar polymer that was invented from this study can optimize conditioning effects in shampoo.
가정용 열병합 시스템의 국내 도입에 따른 온실가스 저감효과 예측
강병하(Byung Ha Kang),윤창호(Chang Ho Yun),안준(Joon Ahn) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.10
The effects of applying the micro CHP system to the domestic sector in Korea were investigated using annual cooling and heating demand data. Four prime movers, micro gas turbine, PEMFC, gas engine and Stirling engine, were compared for three operational modes. Two way buy-back was assumed for both electricity and heat. The Stirling engine gave the lowest CO₂ emission per energy for 300kWh monthly electricity production. However, PEMFC became more effective when considering PURPA criteria. PEMFC generated the least greenhouse gas with higher electrical efficiency for cooling. The Stirling engine, however, became competitive for heating with higher total efficiency
제습로터의 공기누설모델 개발 및 성능 특성에 관한 실험적 연구
강병하(Byung Ha Kang),피창헌(Chang Hun Pi),장영수(Young Soo Chang) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.1
제습로터에서 발생하는 공기누설은 로터와 브러쉬 형태의 누설방지모 틈새의 양단 사이 차압에 의해 발생하는 압력누설이 지배적이며, 실험을 통해 압력누설특성을 파악하였다. 그 결과로, 압력누설량을 로터와 누설방지모의 틈새면적과 차압의 함수로 나타내었다. 위의 상관식을 바탕으로 제습로터의 공기누설모델을 개발하였으며, 실험을 통해 측정된 값과 위 모델을 바탕으로 계산된 값을 비교함으로써 공기누설모델을 검증하였다. 그리고 풍량에 따른 제습로터의 성능실험을 수행하였으며, 공기누설모델을 적용한 성능 분석을 통하여 실질적인 제습량과 공기누설량을 확인 하였다. 또한 동일한 제습로터가 적용된 제습냉방시스템을 고려하여 차압변화에 따른 공기누설의 영향을 공기누설모델을 이용하여 고찰하였다. This study investigates the pressure leakage characteristics of a desiccant rotor with a brush-type air seal. Through a pressure leakage experiment, a correlation equation for the leakage air flow rate is obtained as a function of the air seal area and pressure difference. Using this equation, an air leakage model for the desiccant rotor is developed. By comparing simulation results with the experimental results for the desiccant rotor, the accuracy of the air leakage model is demonstrated. A performance test of a desiccant rotor with various air flow rates is carried out. Using the air leakage model, the effective mass flow rate and air leakage rate are found. In addition, the characteristics of the air leakage are analyzed for a desiccant cooling system using the developed air leakage model.
운전조건에 따른 제습로터의 제습특성과 유용도에 관한 실험적 연구
강병하(Byung Ha Kang),이진주(Jin Joo Lee),김석현(Sukhyun Kim) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.1
An experimental study has been carried out to investigate the dehumidification characteristics for several operating conditions of a compact desiccant rotor. This problem is of particular interest in the design of a desiccant type of dehumidifier. Room temperature, room humidity, regeneration temperature, revolution speed and frontal air velocity of desiccant rotor are varied as operating conditions. The results obtained indicate that dehumidification rate is increased with an increase in the room humidity while dehumidification effectiveness is not changed much. It is also found that the optimal rotor speed and optimal regeneration temperature exist for maximum dehumidification rate and dehumidification effectiveness.
강병하(Byung Ha Kang),김동준(Dong Jun Kim),이충섭(Choong Seop Lee),장영수(Young Soo Chang) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.11
A chiller, having a thermal storage system, can contribute to load-leveling and can reduce the cost of electricity by using electricity at night. In this study, the control experiments and simulations are conducted using both conventional and advanced methods for the building cooling system. Advanced approaches, such as the “region control method”, divide the control region into five zones according to the size of the building load, and determines the cooling capacities of the chiller and thermal storage. On the other hand, the “dynamic programming method” obtains the optimal cooling capacities of the chiller and thermal storage by selecting the minimum-cost path by carrying out repetitive calculations. The “thermal storage priority method” shows an inferior chiller performance owing to the low-part load operation, whereas the chiller priority method leads to a high electric cost owing to the low utilization of thermal storage and electricity at night. It has been proven that the advanced control methods have advantages over the conventional methods in terms of electricity consumption, as well as cost-effectiveness. According to the simulation results during the winter season, the electric cost when using the dynamic programming method was 6.5% and 8.9% lower than that of the chiller priority and the thermal storage priority methods, respectively. It is therefore concluded that the cost of electricity utilizing the region control method is comparable to that of the dynamic programming method.
건설생산체계의 환경 변화에 따른 기계설비분야 발주시스템 변화 전망
강병하(Byung Ha Kang),김경래(Kyungrae Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Mechanical facilities in modern buildings and industrial plants become more important in the view points of energy and environment issues. However, mechanical construction fields are still considered as to be subjected to buildings, even though design and construction of mechanical fields in the construction production process is independent of other fields. Recently, 'Framework Act on the Construction Industry' has been revised since 2007. According to the revision, the barrier of general construction and specialized construction is collapsed and the construction company can register any type of construction classification if they are able to carry out the construction mission. The mechanical construction fields are exempt until 2011 because of the protection of mechanical construction industry. In the present study, the bidding system has been prospected due to the revision of 'Basic Law on Construction Industry' after 2011. The trends for development of mechanical construction fields has been also discussed.
강병하(Byung Ha Kang),피창헌(Chang Hun Pi),김석현(Sukhyun Kim) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.4
In this study, a rational procedures for estimation of insulation thickness of a vertical wall for condensation control or personnel protection has been investigated. Design parameters are height of the wall, thermal conductivity, emissivity, and operating temperatures. The results indicated that the surface emissivity plays a very important role in the design of insulation for the purpose of surface temperature control, especially in natural convection situation. radiation heat transfer coefficients for some new insulation material surface, such as elastomers, estimated to be more than 90% of the total surface heat transfer coefficient.