• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.30 no.2
• /
• pp.57-63
• /
• 2001

광학적계측법을 열 및 물질전달에 응용함으로서 공조 및 냉동분야에 폭 넓게 활용될 수 있는 실험법에 대해 간략히 소개한다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.20 no.5
• /
• pp.329-337
• /
• 1991

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.27 no.3
• /
• pp.218-231
• /
• 1998

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.18 no.3
• /
• pp.279-288
• /
• 1989

• JOURNAL OF ELECTRICAL WORLD
• /
• no.9 s.201
• /
• pp.82-88
• /
• 1993

• 발명특허
• /
• v.37 no.8
• /
• pp.40-44
• /
• 2012

• 월간 기계설비
• /
• s.18
• /
• pp.100-111
• /
• 1991

• JOURNAL OF ELECTRICAL WORLD
• /
• no.8 s.212
• /
• pp.83-89
• /
• 1994

• Journal of the Korean Solar Energy Society
• /
• v.39 no.1
• /
• pp.77-89
• /
• 2019

The solar air heater has various performances according to an obstacle installed in the air duct. Many studies on thermal performance have been conducted. But many of these studies were using a kind of rib type obstacle attached at the bottom of absorbing plate, but they are so hard to be manufactured. In this study, characteristics of the heat transfer and pressure drop in the solar air heater with various horizontal rectangular obstacles was investigated by CFD (Computational Fluid Dynamics) analysis. As a result, the heat transfer performance was improved from 1.2 to 3.32 times depending on installation conditions of rectangular obstacle. The pressure drop, however, also increased with increment of heat transfer performance from 2.8 to 180 times only by changing installation conditions of rectangular obstacle. Thus, the performance factor presenting the thermal performance enhancement on the same pressure drop was also confirmed. As a result, the highest value of 0.828 as better performance factor was obtained at the lower height of rectangular obstacle and this value has started to decrease with increment of heat transfer performance. In the end, it could be confirmed that the pressure drop was carried higher than the quantity of improvement of the heat transfer performance when the heat transfer performance was increased by change of installation conditions of rectangular obstacle. Both heat transfer enhancement and pressure drop to be required for system need to be considered before the rectangular obstacles are applied to the solar air heater.

• Journal of the KSME
• /
• v.35 no.2
• /
• pp.154-166
• /
• 1995

냉동\ulcorner공조기의 성능을 높이기 위해서는 정상상태 운전시는 물론 증발기 열부하 등 각종 작동 조건의 변화에 대응하여 운전의 평형점(balance point) 추이를 적절하게 조정함과 동시에 냉동 사이클 각부의 냉매 상태량을 과도적으로도 제어해야 한다. 이 글에서는 냉동\ulcorner공조기의 자동 제어에 있어서 가장 중요한 요소중의 하나인 냉매계통의 모델화와 냉동 사이클의 응답 및 제어 등에 관해서 서술하고자 한다.