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정용호 청운대학교 건설환경연구소 2015 청운대학교 건설환경연구소 논문집 Vol.10 No.1
Direct connection used for district heating system has some advantages such as energy saving and low initial cost compared with indirect connection since heat exchange is not required in machine room. Furthermore, renewable energy such as solar heat, geothermal heat and heat pump and others can be applied to the direct connection in distrcit heating as supply temperature is comparatively low. In this paper, the economical efficiency for renewable energy as heat sources is evaluated in direct connection in district heating. Result implies resources recovery facility is economically the most efficient. 직접공급방식의 지역난방시스템은 수용가에 설치되는 열교환설비를 필요로 하지 않으므로 초기투자비의 측면이나 에너지절감의 측면에서 유리하다. 또한 공급온도를 낮게 설정하는 것이 가능하므로 태양열, 지열 및 지열원 히트펌프 시스템 등의 신재생에너지를 적용할 수 있는 장점이 있다. 본 연구에서는 직접공급방식의 지역난방시스템에 적용 가능한 신재생에너지의 경제성을 평가하였고, 그 결과로서 소각열을 이용한 열원이 가장 효과적인 것으로 나타났다.
직접공급방식 지역난방시스템의 적정공급온도 및 단위부하 분석
정용호(Jung Yong-Ho) 한국건축친환경설비학회 2010 한국건축친환경설비학회 논문집 Vol.4 No.3
District Heating System(DHS) is one of the most excellent systems in terms of energy saving and environmental protection. The current indirect connection in Korea is applied to the case of big scale, it brings about heat loss in its network. Moreover, high-priced heat exchanger facilities are required. Direct connection has some advantages such as energy saving and low initial cost compared with indirect connection since heat exchange is not required in machine room. Furthermore, renewable energy such as solar heat, geo-thermal heat and heat pump and others can be applied to the direct connection in district heating as supply temperature is comparatively low. However, direct connection is not economical for heavy load and it is difficult to keep the temperature of supply water low. When direct connection is applied, it is the most important to supply stable heat source to consumers. In the previous study, appropriate supply pressure for direct connection are suggested. Therefore, the objective of this study is to offer the fundamental data for applying the direct connection in district heating to Korea by investigating the unit heating load and optimal temperature based on supply condition and stability for consumers from the previous studies. The results of this study are follows; 1) Heating loads(including domestic hot water supply) for each consumers in conventional direct connection system were proved to be excessive comparing to simulated results. 2) The optimal range of supply water temperature was 60~90℃ in case of supply for domestic hot water to each households.
정용호 ( Yong Ho Chung ) 대한내과학회 1969 대한내과학회지 Vol.12 No.4
From January, 1965 to June, 1968, clinical observation was done for 129 cases of bronchiectasis, visited our department and pediatrics of Chonnam University Hospital. 1. The male-female ratio was 2: 1, and 2nd decade age group showed the highest incidence
정용호 한국생활환경학회 2019 한국생활환경학회지 Vol.26 No.1
The shape of the gas separation membrane built into the cartridge of the dehumidifying device was selected as the hollow type and applied to the dehumidification system by the internal and external pressure difference. However, since the hollow fiber type membrane system is installed in a closed form inside the cartridge, excessive pressure loss of the passing air is generated, which may increase the blowing power. Therefore, in this study, the pressure loss of the air passing through the dehumidification cartridge by the installation of the hollow fiber membrane was predicted as the basic research data for the design of the dehumidification system. As a result of the analysis, it was found that the pressure difference at the front and rear end was 4.808Pa when the pressure difference at the upstream and downstream stages was 0.828Pa and 2500CMH, respectively, when the air flow rate was 500CMH, and the overall pressure loss difference was about 5.8 times. It is considered that the pressure loss due to the increase in air volume should be carefully considered.
Multi-electrochemical Signal Generation using Metalloprotein Based on Selective Surface Modification
정용호,유시열,윤진호,민준홍,최정우 한국바이오칩학회 2017 BioChip Journal Vol.11 No.4
In this research, we demonstrate a simple method to generate a multi-peak in a single electrochemical signal for the application to bioelectronics devices. Myoglobin is used as a source of electrochemical signal, and its property of redox peak is controlled by the introduction of various chemical-linking materials. Based on controlled signals of myoglobin, multisignal having dual peak is achieved by the signal combination of six electrodes, which have different electrochemical signals by the modification of each electrode with different kinds of chemical linkers individually. For the device formation, selective immobilization process was performed by using reductive cleavage of pre-immobilized thiol group. As a result, the proposed concept shows simple and effective formation of a multi-signal in a single electrochemical signal as compared with other methods based on heterolayer and hybrid materials, and it can be directly applied to materialize practical bioelectronic devices such as a bio-logic gate or bio-computing system