1985년부터 2014년까지의 측정 수평면전일사량과 기상데이터 간의 경향 및 상관성 분석

김정배,Kim, Jeongbae 한국교통대학교 융복합기술연구소 2019 융ㆍ복합기술연구소 논문집 Vol.9 No.1

After 30 years of KKP model analysis and extended 30 years of accuracy analysis, the unique correlation and various problems between measured horizontal surface insolation and measured weather data are found in this paper. The KKP model's 10yrs daily total horizontal surface insolation forecasting was averaged about 97.7% on average, and the forecasting accuracy at peak times per day was about 92.1%, which is highly applicable regardless of location and weather conditions nationwide. The daily total solar radiation forecasting accuracy of the modified KKP cloud model was 98.9%, similar to the KKP model, and 93.0% of the forecasting accuracy at the peak time per day. And the results of evaluating the accuracy of calculation for 30 years of KKP model were cloud model 107.6% and cloud model 95.1%. During the accuracy analysis evaluation, this study found that inaccuracies in measurement data of cloud cover should be clearly assessed by the Meteorological Administration.

태양 복사와 열화상이미지의 관계에 대한 기초 연구

김정배,Kim, Jeongbae 한국교통대학교 융복합기술연구소 2020 융ㆍ복합기술연구소 논문집 Vol.10 No.1

Among the factors that must be taken into account when using thermal imaging cameras that are expanding their application to various fields, a basic study was conducted focusing on temperature on the effect of solar radiation on the photographed thermal image. Through all experiments, in order to use an image taken with a thermal imaging camera for an object installed or located outdoors, a separate temperature correction according to the size of solar radiation or a separate device to block the effect of solar radiation must be additionally installed. Since the temperature of the same object may vary in the thermal image taken indoors or outdoors, it is necessary to calibrate it through comparison with other temperatures as a reference point. In the case of measuring the temperature of a glossy surface such as metal indoors with a thermal imaging camera, it was confirmed that an environment that can remove the light reflection effect by the glossy surface must be constructed and photographed.

인공 광원을 이용한 실내 조명 효과에 대한 기초 실험 연구

김정배,Kim, Jeongbae 한국교통대학교 융복합기술연구소 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.1

This study is performed to investigate the effect of the artificial light for room lightening. To do that, the experiments were done using the black room with 1m3 and performed to show the effect of the length between the room and light source and light intensities as LUX. The LUX of 18 sites in the room was measured using LUX meter. The length between the room and the light source was chosen as 500mm, 1000mm, and 1500mm and the light intensities was 3 levels. The results were shown the distinct difference between the part directly projected through the light path and non-directly projected. So, the light delivery path have to be modified for next step research. The results were very sensitive for the part directly projected through the light path. This study showed the basic results for room lightening using light source to simulate the solar lightening and was worth in a strict sense as fundamental study.

나노유체를 이용한 냉동사이클 효율 향상 과제의 소개

김정배,이규선,이근안,Kim, Jeongbae,Lee, Kyu Sun,Lee, Geun An 한국교통대학교 융복합기술연구소 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.2

In this paper, we will introduce the overview of new project dealing how to increase of refrigeration cycle COP using nano-fluids, CuO, TiO2, Al2O3, that are used on similar previous studies. Recently many studies were performed to show the effect of nano-fluids at refrigeration cycle. But, the reason was not cleared yet. In general, the flow phenomena at the evaporator were guessed to be mixed with the partial pool boiling condition and the flow boiling condition from the previous results not published yet. So, we hope that the COP increase of refrigeration cycle will be verified and showed through this project.

Al₂O₃ 나노 입자를 적용한 증기 압축 냉동 사이클의 성능

김정배,이규선,이근안,Kim, Jeongbae,Lee, Kyu-Sun,Lee, Geunan 한국에너지학회 2015 에너지공학 Vol.24 No.4

$Al_2O_3$ 나노입자의 농도별로 전동식 압축기의 회전속도(rpm)의 변화에 따른 자동차용 증기압축 냉동사이클의 COP를 실험적으로 평가하고 나노입자를 적용하지 않은 기준 사이클의 COP와 비교하였다. 이를 위해 실제 하이브리드 자동차에서 쓰는 사이클 부품들을 이용하고 항온항습 챔버를 이용하지 않는 방식으로 장치를 설계 및 제작하였다. 별도의 전동식 인버터 압축기의 제어장치를 활용하여 1000rpm부터 500rpm 간격으로 4000rpm까지와 $Al_2O_3$ 나노입자를 질량비 기준으로 농도 0.05%, 0.1%, 0.2%와 0.5%의 범위에 대하여 실험을 수행하였다. 이를 통해 기준 사이클과 비교하면 기준 사이클의 일반적인 운전조건인 약 3000rpm에서 $Al_2O_3$ 나노유체를 적용하는 사이클의 COP는 질량 농도비 0.05%에서는 15.4% 정도, 농도비 0.1%, 0.2% 및 0.5%에서는 각각 9.4%, 13% 및 9.6%가 증가함을 알 수 있었다. An experimental study was performed estimating COP(Coefficient of Performance) of air-conditioning cycle using inverter scroll compressor with and without $Al_2O_3$ nano particle. All experiments were done for various compressor speeds from 1000~4000 rpm and used the inverter controller called CANDY to change the compressor rpm. The air-conditioning cycle components in the apparatus were used as same with components of YF hybrid car. To estimate the COP, this study measured the temperature and pressure at inlets and outlets of compressor, condenser, and evaporator. And also measured the compressor input power using Powermeter. Through the experiments, the maximum error to estimate COP was shown about ${\pm}6.09%$ at 3500rpm. The COP of refrigeration cycle with $Al_2O_3$ nano-particle was similar with that of the base cycle without nano-particle between 1000~3000 rpm of the compressor speed. But, This study showed that the COP of the cycle with $Al_2O_3$ over 3000 rpm of the compressor speed was higher than that of the base cycle due to the higher heat transfer rate increased in the evaporator from the higher oil flow rate inside the cycle as well known. Those results can be used the basic and fundamental data to design the air-conditioning cycle using inverter scroll compressor with $Al_2O_3$ nano particle.

포화상태 풀비등시 단일기포의 성장에 관한 연구

김정배(Jeongbae Kim),이한춘(Han Choon Lee),오병도(Byung Do Oh),김무환(Moo Hwan Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4

Nucleate boiling experiments with constant wall temperature of heating surface were performed using R113 for almost saturated pool boiling conditions. A microscale heater array and Wheatstone bridge circuits were used to maintain a constant wall temperature condition and to measure the heat flow rate with high temporal and spatial resolutions. Bubble images during the bubble growth were taken as 5000 frames a sec using a high-speed CCD camera synchronized with the heat flow rate measurements. The geometry of the bubble during growth time could be obtained from the captured bubble images. The bubble growth behavior was analyzed using the new dimensionless parameters for each growth regions to permit comparisons with previous results at the same scale. We found that the new dimensionless parameters can describe the whole growth region as initial and later respectively. The comparisons showed good agreement in the initial and thermal growth regions. The required heat flow rate for the volume change of the observed bubble was estimated to be larger than the instantaneous heat flow rate measured at the wall. Heat, which is different from the instantaneous heat supplied through the heating wall, can be estimated as being transferred through the interface between bubble and liquid even with saturated pool conditions. This phenomenon under a saturated pool condition needs to be analyzed and the data from this study can supply the good experimental data with the precise boundary condition (constant wall temperature).

판형 담수기의 열적 성능에 관한 실험적 연구

김정배(Jeongbae Kim),주문창(Moon Chang Joo),윤응상(Eung Sang Yoon),곽희열(Hee Youl Kwak) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

Parametric experiments for evaluating the performance of fresh water generator applied plate type heat exchanger were performed in this study. The test facility for the performance test were designed and manufactured. The maximum fresh water yield of the fresh water generator applied in this study was designed as 1.5 Ton/day. The parameters relating with the performance of fresh water generator are known as sea water inlet temperature, hot water inlet temperature, and hot water flow rate. The test ranges for each parameters were 10, 20, and 30℃ for sea water inlet temperature, 65, 75, and 85℃ for hot water inlet temperature, 2.0, 2.5, and 3.0㎥/hr for hot water inlet volume flow rate, respectively. And the experiments to reveal the accuracy of experimental apparatus and to show the repeatability and reproducibility were also performed. The quantitative analysis for the heat transfer mechanism and mass balance under physically possible assumptions is also conducted with simple thermodynamic equations. The experimental and estimated quantities were compared. Through the experiments and simple analysis, this study showed detail operation characteristics of fresh water generator with plate type heat exchanger.

열화상카메라를 이용한 Rayleigh-Benard-Marangoni 자연대류 실험 연구

김정배 ( Jeongbae Kim ) 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.2

Rayleigh-Benard-Marangoni (RBM) convection have been artificially made for application of various engineering fields. For a relatively larger circular container, natural convection experiments were carried out to reveal and show the flow characteristics with engine oil (SAE30) using IR camera. IR camera has captured the temperature distribution on the free surface. From these experiments, it was confirmed that it was possible to quantitatively analyze the occurrence characteristics of RBM flow clearly from the thermal images taken with IR camera. As the aspect ratio increased, both the number of internal and external cavities increased. And found that the criteria of RBM flow generation proposed through previous experiments performed for small-sized containers are also very effective with the results on larger circular container.

2012년 서울 지역의 측정 수평면전일사량을 이용한 태양열 시스템 설계

김정배(Kim Jeongbae) 한국태양에너지학회 2016 한국태양에너지학회 학술대회논문집 Vol.2016 No.3

100㎾ 이상의 발전량을 가진 태양광 발전소들의 장기 운전 데이터 분석 연구(1)

김정배(Jeongbae Kim) 한국태양에너지학회 2022 한국태양에너지학회 학술대회논문집 Vol.2022 No.10