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KIYOSHI SAITO,JONGSOO JEONG 대한설비공학회 2012 International Journal Of Air-Conditioning and Refr Vol.20 No.1
The energy consumption of the systems used in the heating, refrigerating, and air-conditioning field continues to increase. This necessitates improvements to the efficiency of these systems. However, in Japan, the performance of heating, refrigerating, and air-conditioning systems has already been improved greatly owing to the considerable efforts of manufacturers, the government, and academia. Therefore, it will not be easy to further decrease energy consumption simply by improving the efficiency of each system. In order to adhere to the demands of the worldwide energy saving policy, we need to investigate the best combinations and total energy management schemes for heating, refrigeration, and air-conditioning systems. To this end, simulation holds greater promise than actual field-testing because it is not easy to carry out such experiments on actual large-scale systems. High-precision simulation models are necessary for these investigations. Hence, we are developing simulation models for a heat pump, room air-conditioner, desiccant dehumidifier, indirect evaporative cooler, fuel cell, solar panel, and so on. This paper describes high-accuracy simulation models for a CO2 heat pump, absorption heat pump, and desiccant dehumidification system. We also discuss the simulator that we have developed, based on those models. This simulator is called "Energy Flow + M". It is very easy to use because it has a user-friendly GUI. It has already been made available worldwide through the Internet. It is expected to be used to decrease the energy consumed by heating, refrigeration, and air-conditioning systems.
마이크로 채널 열교환기를 이용한 CO₂히트펌프의 소형화
정종수(Jong-Soo Jeong),齋藤潔(Kiyoshi Saito),최광일(Kwang-Il Choi),오종택(Jong-Taek Oh) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
CO2 heat pump water heater is being recognized as the effective equipment against global warming. Therefore, it is rapidly getting attention in Japan. In this paper, to realize more miniaturization and high performance of CO₂ heat pump, gas cooler and evaporator designed with microchannel were adopted to typical double-pipe helical type of gas cooler and cross-finned tube type of evaporator respectively, and we performed the simulation for heat transfer characteristic and optimum design in each component that has not been clarified clearly. Based on the optimum design of each heat exchanger, CO₂ heat pump with microchannel heat exchangers was evaluated as system. As the results, the volume of microchannel gas cooler and evaporator became 50% and 85% smaller than typical gas cooler and evaporator for CO₂ heat pump respectively. For analysis of system, it was clarified that CO₂ heat pump with microchannel heat exchangers could be driven as same as conventional CO₂ heat pump by simulation.
데이터 센터 국소냉각 CO₂ 열유송 시스템의 특성 분석
정종수(Jong-Soo Jeong),齋藤潔(Kiyoshi Saito),오종택(Jong-Taek Oh),최광일(Kwang-Il Choi) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In recent years, information and communications technologies (ICT) have found wide use in society, in particular, with the advancement of high-performance and high-density volume of IT devices, and concurrently, the heat value generated from servers and routers per unit area of data centers have also greatly increased. Therefore, we investigated the performance and characteristics of a heat transportation system adopting CO₂ as the working fluid to prevent the occurrence of hot spots and decrease the power consumed by a conventional overall air conditioning system installed at a data center. CO₂ is a much better choice than conventional working fluids because of its electrical reaction stability, the utilization of latent heat, reduction of circulation flow rate, decrease in the tube diameter, and reduction in the pump power. Therefore, this study aims to investigate the performance and characteristics of the server spot cooling heat transportation system under forced circulation by means of experiments and simulations. In the end, we determined the optimum CO₂ circulation rate that maximizes the rejected heat flow rate, and minimizes power consumption.
Energy Analysis for the Solar Thermal Cooling System in Universitas Indonesia
M. Idrus Alhamid,Nasruddin,Arnas Lubis,KIYOSHI SAITO,Hajime Yabase,Nyaya Aisyah 대한설비공학회 2019 International Journal of Air-Conditioning and Refr Vol.27 No.3
The objective of this study is to analyze all the energy used in the solar cooling system in Universitas Indonesia. This system uses three energies at the same time, namely, solar, gas and electricity energies, which are used to provide a required cooling capacity from the mechanical research center (MRC) building in Universitas Indonesia. The single–double-effect absorption chiller is the main component of the solar thermal cooling system to provide the chilled water that is circulated between the system and MRC building. In this system, heat from solar energy is absorbed by the evacuated tube solar collector and then transferred to the hot water that is used to generate vapor together with the gas at the absorption machine. On the other hand, electricity is mostly consumed by the pumps to circulate the hot, cooling and chilled water, also the working fluids inside the absorption machine. Finally, all the energies used to create a thermal comfort zone in the MRC building based on the Indonesia weathers are reported in this paper.
범용 에너지시스템 해석 소프트 “ENERGY FLOW+M”의 개발 - CO₂ 히트펌프의 정특성 해석
정종수(Jong-Soo Jeong),齋藤 潔(Kiyoshi Saito) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In recent years, energy crisis and global environment problem are getting serious. In the field of the refrigeration and the air conditioning, we must improve efficiency of systems greatly. When we carry out the simulation, depending on the programmer, the describing method or the language of the simulation code is varied. Therefore, the simulation technology can t be handed down to the others. This is the big problem in the simulation technology. To resolve this problem, we developed the modular analysis theory that could make the simulation code generally. We have already confirmed that this theory can be applied to the compression type refrigerator, absorption refrigerator, desiccant air conditioning system and so on. Then, based on this theory, we have developed the general-purpose energy system analysis software that is called Energy Flow +M . The feature of this software is that the energy system can be analyzed by only using GUI through Internet. From this, all the people in the world easily access to this code and investigate the energy saving. In this study, we put the model of CO₂ heat pump into Energy Flow +M and found out that CO₂ heat pump can be analyzed with Energy Flow +M .
최광일(Kwang-Il Choi),M. Rifaldi,오종택(Jong-Taek Oh),Kiyoshi Saito,정종수(Jong Soo Jeong) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
An experimental study for convective boiling heat transfer was conducted with NH₃ in horizontal smooth minichannels. The test section is made of stainless steel tubes with inner diameters of 1.5 ㎜ and 3.0 ㎜, the length 2000 ㎜ each. The minichannels are uniformly heated by engaging an electric current directly to the test section; all components are well insulated to prevent heat losses. Pressure drop and local heat transfer coefficients were obtained for a heat flux range of 10-80 ㎾/㎡, a mass flux range of 50-800 ㎏/㎡s, saturation temperatures of 0, 5, and 10℃ and quality ranges of up to 1.0. Nucleate boiling heat transfer contribution was predominant, especially at low quality region. The effects of mass flux, heat flux, and inner tube diameter, on pressure drop and heat transfer coefficient are presented. The experimental results are compared against several existing correlations. A new boiling heat transfer coefficient correlation for NH3 was developed with 9.79% MD and -3.57% AD.
최광일(Kwang-Il Choi),M. Rifaldi,오종택(Jong-Taek Oh),Kiyoshi Saito,정종수(Jong Soo Jeong) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Convective boiling heat transfer experimental in horizontal minichannels was conducted with NH₃ as the working refrigerant. The test section is made of stainless steel tubes with inner diameters of 3.0 ㎜ and 1.5 ㎜, the lengths and 2000 ㎜ and 1000 ㎜, respectively. The minichannels are uniformly heated by engaging an electric current directly to the single tubes. The local heat transfer coefficients were obtained over a heat flux range of 20 to 80 ㎾/㎡, a mass flux range of 50 to 500 ㎏/㎡s, a saturation temperature range of 0 to 10℃, and quality up to 1.0. Nucleate boiling heat transfer contribution was predominant, especially at low quality region. The effect of inner diameter, mass fluxes, heat fluxes and saturation temperatures are explained.
Takai, Tomoaki,Inamoto, Teruo,Komura, Kazumasa,Yoshikawa, Yuki,Uchimoto, Taizo,Saito, Kenkichi,Tanda, Naoki,Kouno, Junko,Minami, Koichiro,Uehara, Hirofumi,Takahara, Kiyoshi,Hirano, Hajime,Nomi, Hayahi Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6
Background: Despite widely adopted standard methods for follow-up including cystoscopy plus cytology, recurrence rates of non muscle-invasive bladder cancer (NMIBC) have not improved over the past decades, still ranging from 60% through 70%. Hence, widely acceptable surveillance strategies with excellent sensitivity are needed. Early recurrence has led to the development of a novel cystoscopy technique utilizing photodynamic diagnosis (PDD). Although, no studies have evaluated the efficacy of PDD for patients of MIBC, BCG failure or 2nd-transurethelial resection (TUR). Materials and Methods: The present study was performed from October 2012 through May 2013. IRB approved 25 patients initially underwent a cystoscopy examination of white light and blue light followed by the resection of tumors identified. Resections were performed from bladder mucosa areas considered suspicious at PDD, along with PDD negative normal bladder mucosa area resected by random biopsy. Specimens were divided into two groups, PDD positive and negative. Primary endpoints were sensitivity and specificity. Results: A total of 147 specimens extracted from 25 patients were included in the analysis. Some 45 out of 92 PDD-positive specimens were confirmed to have bladder cancer, and 51 out of PDD-negative 55 specimens were confirmed to be cancer negative. The sensitivity of PDD was 91.8% (45/49) and specificity was 52.0% (51/98). The sensitivity:specificity was 89.5% (17/19) : 47.6% (30/63) in 12 2nd-TUR patients, 90.5% (19/21) : 61.1% (11/18) in seven MIBC patients, and 95.0% (19/20) : 48.5% (16/33) in eight failed BCG cases. Conclusions: PDD-TURBT has high sensitivity to diagnose BC even for 2nd-TUR, MIBC or BCG failure cases.
Kanako Kono,Tohru Morisada,Kumiko Saika,Eiko Saitoh Aoki,Etsuko Miyagi,Kiyoshi Ito,Hirokazu Takahashi,Tomio Nakayama,Hiroshi Saito,Daisuke Aoki 대한부인종양학회 2021 Journal of Gynecologic Oncology Vol.32 No.3
Objective: In 2013, a cohort study aimed to clarify the positive and negative effects ofintroducing the human papillomavirus (HPV) testing for population-based cervical cancerscreening has been launched in Japan. This study included four screenings during thesubsequent 7-year follow-up period. We aim to describe the results of the first round of thisstudy on cervical cancer screening here. Methods: This study began in September 2013 with recruitment completed in March 2016. Women aged 30–49 years were divided into 2 groups: those who received uterine cervicalcytology alone in the first year (control group), or those who received a combination ofcytology and HPV testing (intervention group), based on their age. After first screening,women with positive result of cytology or positive HPV test required referral. We summarizedthe results of the first round of cervical cancer screening. Results: Of the 25,074 women who were eligible for the study, 13,845 women (55.2%) werescreened with cytology alone; 11,229 women (44.8%) received a combination of cytologyand HPV testing. After screening, 407 women (2.9%) in the control group and 1,003 women(8.9%) in the intervention group required referral, respectively. Adding HPV testing increasedreferral rate significantly (p<0.001). Conclusion: After first screening, introduction of HPV testing appears to contribute tosignificantly higher referral rates, suggesting that the number of colposcopies as a detailedexamination may increase. These preliminary findings suggest that if HPV testing is introduced into screening, medical institutions need to be prepared for an increasing numberof follow-up examinations.