Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency
碩士 === 中原大學 === 機械工程研究所 === 96 === ABSTRACT The present work is to discuss the discharge of flow velocity, turbulent intensity, discharging angles and back panel flow inlet to sustain the efficiency of air curtain and reduce the temperature gradient of the cabinet. We set the flow inlet velocity in...
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ndltd-TW-096CYCU54890702015-10-13T14:53:14Z http://ndltd.ncl.edu.tw/handle/73098927048592279751 Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency 噴流捲入率對開放式冷藏櫃氣簾效率之影響 Jin-Tang Li 李金堂 碩士 中原大學 機械工程研究所 96 ABSTRACT The present work is to discuss the discharge of flow velocity, turbulent intensity, discharging angles and back panel flow inlet to sustain the efficiency of air curtain and reduce the temperature gradient of the cabinet. We set the flow inlet velocity in a range of to research the influence of air curtain efficiency and select several suitable parameter of velocity to test the entrainment rate. We discuss the correlation among the discharging velocity of , turbulence intensity of 5~25% and discharging angles of -20°~20° accompanied with whether the back panel flow inlet is existing or not. The commercial code of CFDRC is adopted to simulate and the results depict the velocity and temperature distributions. After simulation and analysis, we can figure that the optimum velocities are in a range of and the entrainment rate can be decreased by the weaker turbulence intensity efficiently. The optimum discharging angle is between 15°and 20° which the flow could be linked to the return air grill and decrease the entrainment rate. In other respects, to compare the results of opening the level of 5 and 6, it could be seen the cooling effects on both A and B sections and the temperature decrease is about 2~3K. The temperature would increase if the level of 5or 6 is not opening. The cooling performance is not so obviously on section A, whereas the temperature decrease is about 3K on section B, thus a lot of free space could be released. R. Tsai 蔡瑞益 2008 學位論文 ; thesis 99 zh-TW |
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碩士 === 中原大學 === 機械工程研究所 === 96 === ABSTRACT
The present work is to discuss the discharge of flow velocity, turbulent intensity, discharging angles and back panel flow inlet to sustain the efficiency of air curtain and reduce the temperature gradient of the cabinet. We set the flow inlet velocity in a range of to research the influence of air curtain efficiency and select several suitable parameter of velocity to test the entrainment rate. We discuss the correlation among the discharging velocity of , turbulence intensity of 5~25% and discharging angles of -20°~20° accompanied with whether the back panel flow inlet is existing or not. The commercial code of CFDRC is adopted to simulate and the results depict the velocity and temperature distributions.
After simulation and analysis, we can figure that the optimum velocities are in a range of and the entrainment rate can be decreased by the weaker turbulence intensity efficiently. The optimum discharging angle is between 15°and 20° which the flow could be linked to the return air grill and decrease the entrainment rate. In other respects, to compare the results of opening the level of 5 and 6, it could be seen the cooling effects on both A and B sections and the temperature decrease is about 2~3K. The temperature would increase if the level of 5or 6 is not opening. The cooling performance is not so obviously on section A, whereas the temperature decrease is about 3K on section B, thus a lot of free space could be released.
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author2 |
R. Tsai |
author_facet |
R. Tsai Jin-Tang Li 李金堂 |
author |
Jin-Tang Li 李金堂 |
spellingShingle |
Jin-Tang Li 李金堂 Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency |
author_sort |
Jin-Tang Li |
title |
Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency |
title_short |
Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency |
title_full |
Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency |
title_fullStr |
Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency |
title_full_unstemmed |
Jet Entrainment Rates of Air Curtain to Open-Type Refrigeration Display Cabinet Efficiency |
title_sort |
jet entrainment rates of air curtain to open-type refrigeration display cabinet efficiency |
publishDate |
2008 |
url |
http://ndltd.ncl.edu.tw/handle/73098927048592279751 |
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