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Evaluation of Ventilation Systems in an Enclosed Nursery Pig House

무창자돈사의 환기시스템 정립 및 환기효율 평가

  • Song, J.I. (National Livestock Research Institute, R.D.A) ;
  • Choi, H.L. (School of Agricultural Biotechnology Engineering, Seoul National University)
  • Published : 2002.02.28

Abstract

An experiment was conducted to establish the most suitable ventilation system for the enclosed nursery pig house in Korea, comparing four different ventilation systems ; i) air enters through perforated ceiling and exhausts through chimney (NA), ii) air enters through perforated ceiling and exhausts through side walls (NB), iii) air enters through perforated ducts and exhausts through side walls (NC) and iv) air enters through perforated ducts and exhausts through chimney(ND). The experiment was carried out during winter and summer separately. The experimental pigs were weaned at fourteen days old in winter (December-February) and at twenty one days old in summer (June-August). The main results of the experiment are as follows : A preliminary experiment showed that in the NC system during summer, air can reach all the pig rooms in the house and the air flow rates of the upper, middle (1.2 m height of the room) and low (at the height of pig stature) parts of the room were measured at 7.0-8.08, over 0.5 and over 0.2 m/s, respectively, which flow rates were much higher(p$<$0.05) than those in other system. At the minimum ventilation efficiency during winter, air flow rates of upper, middle and low parts of the room equipped with the NC system were detected at over 1, less than 0.5 and around 0.07 m/s, respectively. It is concluded that the separated ventilation system air-entering through ducts is the most suitable for the ventilation system of the enclosed nursery pig house and the exhausting system through side walls is more efficient for ventilation than the system through roof. Furthermore, to sustain proper temperature and reduce energy waste as well as heat consumption, a future research should be carried out to develop the environmental control system in relation to developing a heat regulator.

본 실험은 우리 나라에 무분별하게 시설되어 있는 무창자돈사의 환기시스템을 네 종류(NA : 천공비닐 입기구 $\rightarrow$ 지붕배기, NB : 천공비닐 입기구 $\rightarrow$ 측벽 배기, NC : 덕트천공 입기 $\rightarrow$ 측벽 배기 및 ND : 덕트천공 입기 $\rightarrow$ 지붕 배기)로 대별하여 적정 환기시스템을 정립하고자 환기 및 현장실험을 통하여 검증하고자 하였다. 실험은 겨울철과 여름철로 나누어 실시하였으며, 돈사 현장실험은 서울대학교 농업생명과학대학 부속동물목장 축산환경실의 실험돈사에서 겨울철(12월-2월)과 여름철(6월-8월)로 나누어 실시하였다. 1. 각 돈방에 공기가 입기될 수 있는 덕트이기 때문에 여름철 예비실험 결과 NC시스템은 각 돈방 전체에서 덕트 천공 아래(상부)의 공기속도는 7.0-8.08 m/s, 1.2 m (중앙)지점에서는 0.5 m/s 이상, 자돈체고(하부)에서는 0.2 m/s 이상 감지되어 다른 시스템에 비하여 우수하였다(p$<$0.05). 2. 최소환기 수준인 겨울철 예비실험 결과 NC 시스템은 NA, NB, ND와 달리 덕트 천공아래(상부)의 공기속도는 1 m/s 이상, 1.2 m(중앙) 지점에서는 0.5 m/s 이하, 자돈체고(하부)에서는 평균 0.07 m/s 정도 감지되었다. 이상의 실험결과를 종합해 볼 때 무창 자돈사의 환기시스템은 덕트를 통한 각 돈방의 개별 환기시스템이 적합한 것으로 판단되며, 배기시스템은 지붕배기보다는 측벽배기가 효율이 높은 것을 알 수 있었다. 그리고 자돈의 보온을 위한 보조열원에 있어서는 에너지 낭비를 줄일 수 있도록 과도한 열량의 소모를 막기 위한 조절기의 개발이 연계된 환기 제어시스템의 연구가 진행되어야 한다고 생각된다.

Keywords

References

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