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후면 환기형 BIPV 시스템의 레이놀즈수에 따른 전력 및 열성능 특성에 관한 해석적 연구
박준언(Jun Un Park),서항석(Hang Suk Suh),이성주(Sung Joo Lee),최윤식(Yun Shic Choi) 대한설비공학회 2020 설비공학 논문집 Vol.32 No.7
The purpose of this study was to analyze the electrical and thermal characteristics of the various types of ventilating BIPV systems. Compared with the conventional top and down block off type, the top and down open BIPV system using natural stack effect and mechanical ventilating type has potential to improve the conventional block off type BIPV systems’ in-site various problems like PV cell high temperature. These kinds of conventional block off BIPV have low efficiency power production and shut-off at the junction box for high humidity ratio environment condition. Hence, it is critical to compare the PV cell temperature, efficiency, and power production between the mechanical ventilating type BIPV and the conventional block off and natural ventilating type BIPV system. For this purpose, the IPMVP OPTION D analytical program TRNSYS and the type 567 model based on the Sandia model were used and the PV cell temperature, PV electricity efficiency, and BIPV system useful energy rate were estimated with different Reynolds number cases, such as the natural ventilation and the forced mechanical ventilation flow. As for results, first at the BIPV electrical point of view, the Reynolds number increasing led to lower PV cell temperature, higher PV efficiency, and higher PV power production. Especially, the maximum BIPV cell temperature occurred at 12 am on October 3. At that time, at each case-1 (Reynolds number 0) and case-9 (Reynolds number 30,304), the respective PV cell temperature value showed 67.6℃ and 36.3℃, respectively, and the corresponding PV efficiency indicated 8.0% and 12.3%, respectively. The individual PV production power value marks were 59.5 kW and 91.9 kW. Second, at the PV thermal view point, increasing Reynolds number induces more annually BIPV building heating useful energy. Particularly at each case-1 (Reynolds number 0) and case-9 (Reynolds number 30,304), the respective BIPV building heating useful energy showed 0 kWh/yr and 7,514 kWh/yr.
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돼지 분변 유래 PORCINE ENTEROVIRUS의 물리학적 특성 및 병원성에 관한 연구
박정우 ( Jeong Woo Park ),이종인 ( Jong In Lee ),신용호 ( Yong Ho Shin ),조우영 ( Woo Young Cho ),최윤식 ( Yun Shic Choi ) 한국가축위생학회 1991 韓國家畜衛生學會誌 Vol.14 No.2
28 porcine enteroviruses were isolated from 86 pig-feces of 9 swine farms located in souti region, Chung-buk, from March to September 1990. Physico-chemical properties and pathogenicity of isolates were investigated. Results obtained throughout experiments are summarized as follows. According to the age, weanlings(40-90 days), sucklings(10-30 days) and adult pigs(6 months over) showed the isolation rate of 67%, 8% and 4%, respectively. By physico-chemical tests, YD-90 /22, YD-90/43 and YD-90 /64 strains were found to be ether, chloroform and PH stable. Nucleic acid test suggests the virus to have a DNA genome. Most of the isolates were not evident of hemagglutinin using erythrocytes from various mammalian & avian. 22 strains among the isolates were shown CPE type I and the remainders were CPE type Ⅱ. 3 strains among isolates of CPE type 1 strains were neutralized with high titers to serotype 2 antiserum. Ir. the study on virus growth curve in PK 15 cells, YD-90 /22, YD-90/43 and YD-90 /64 strains showed the maximum infectivity titers(106.0-106.5 TCID50 /me) at 4 days post inoculation(PI). When 30 day-old commercial piglets were inoculated only intraoral route with the YD-90/22 strain at 106.0 TCID50/m, piglets not showed the symptoms. But piglets inoculated by intramuscie route, intraoral and intramuscie route after pretreat with dexamethasone(2.5mg /kg) for 5 days were shown the symptoms of anorexia, diarrhea, pyrexia and ataxia at 4th 6th days PT. The viral reisolation in the virus-inoculated piglets was examined from feces. The viruses were recovered intermittently from 2nd to 16th day P1 and at 4th-6th day P1, all piglets excreted viruses.
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