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겨울철 강제환기식 돈사 내 온실가스 (CH<sub>4</sub>, N<sub>2</sub>O) 배출 특성 연구
박준용 ( Park Junyong ),정민웅 ( Jung Minwoong ),조광곤 ( Jo Gwanggon ),장유나 ( Jang Yu-Na ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.4
The emission characteristics and emission factors were determined by measuring the concentration of methane (CH4) and nitrous oxide (N<sub>2</sub>O), the amount of ventilation, etc. in the two fattening rooms which have the same environment in winter. As a result of monitoring, the average concentration of CH<sub>4</sub> and N<sub>2</sub>O was 20.7-26.7 ppm and 1.4-1.6 ppm. The average temperature inside the room was measured at 20.0-21.4℃, and the average ventilation was 1345.4-1567.3 ㎥/h. The daily emission of CH<sub>4</sub> for the first 30 days showed a constant emission of 3.6-8.2 g/d/㎡/pig, but thereafter, the emission increased rapidly. The daily emission of N<sub>2</sub>O was 0.7-1.3 g/d/㎡/pig, showing stable emission during the test period, and relatively insignificant emission compared to the emission of CH4. After repeated test, it was confirmed that there was no significant difference between the two rooms. As a result, the CH<sub>4</sub> 6 . 21 g /d/㎡/pig and N<sub>2</sub>O 1.02 g/d/㎡/pig average emission for each room was derived.
풍동실험을 통한 방풍용 서양측백나무와 농업용방풍망의 공기역학계수 평가
이소진 ( Lee¸ Sojin ),하태환 ( Ha¸ Taehwan ),서시영 ( Seo¸ Siyoung ),송호성 ( Song¸ Hosung ),우샘이 ( Woo¸ Saemee ),장유나 ( Jang¸ Yuna ),정민웅 ( Jung¸ Minwoong ),조광곤 ( Jo¸ Gwanggon ),한덕우 ( Han¸ Dukwoo ),황옥화 ( Hwang¸ Okh 한국농공학회 2021 한국농공학회논문집 Vol.63 No.5
Windbreak forests, which have a windproof effect against strong winds, are known to be effective in reducing the spread of odors and dust emitted from livestock farms. The effect of reducing the spread of odors and dust can be estimated through numerical models such as computational fluid dynamics, which require aerodynamic coefficients of the windbreaks for accurate prediction of their performance. In this study, we aimed to evaluate the aerodynamic coefficients, Co, C<sub>1</sub>, C<sub>2</sub>, and α, of two windbreaks, Thuja occidentalis and a mesh net, through wind tunnel experiments. The aerodynamic coefficients were derived by the relation between the incoming wind speed and the pressure loss due to the windbreaks which was measured by differential pressure sensors. In order to estimate the change in the aerodynamic coefficient concerning various leaf density, the experiments were conducted repeatedly by removing the leaves gradually in various stages. The results showed that the power law regression model more suitable for coefficient evaluation compared to the Darcy-Forchheimer model.