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축사용 폐열회수 환기장치의 열교환소자 설계를 위한 수치해석적 연구
한화택(Hwataik Han),남상훈(Sang-Hoon Nam),한건수(Geon-Su Han) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
A numerical study on heat exchanger element is presented to design high efficiency HRV units for livestock buildings. Since it is humid in livestock buildings, condensation and frost formation can create problems and decrease heat exchanger performance. In this study, the heat exchanger efficiency and pressure loss are evaluated by varying flow rates and outdoor temperature conditions. The condensation area and frost area are evaluated from psychrometric analysis to ensure proper airflow rates through the exchanger. Results show that the efficiency decreases and pressure drop increases with flow rate increased. The condensation area is increased with flow rate increased at -5℃ and -10℃, but it decreases with flow rate changes 10 to 15 CMH at -20℃.
단순화된 결로 해석을 적용한 축사용 폐열회수 환기장치의 수치해석적 연구
한화택(Hwataik Han),남상훈(Sang-Hoon Nam),한건수(Geon-Su Han) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In cold climates, mechanical ventilation systems experience problems with condensing water from humid indoor air. it is important to consider the effect of condensation heat resulting from condensation on heat exchanger surface. In this study, we take into account the effects of condensation and evaluate heat exchanger efficiency by using a simplified condensation method with artificial specific heat according to the amount of latent heat. The condensation areas are also evaluated and the values are compared with the case when the condensation heat is not taken into account. Results show that the efficiency taking into account the condensation heat is about 16% higher than those not considering condensation heat when indoor relative humidity is 90%