外氣空調箱回風風量節能效益分析

Return Air Effect of Makeup Air Handling Unit on Energy Saving

10.29911/JEHVACE_NEW.202111_(130).0001

駱文傑；施和璋

外氣空調箱 ； 回風 ； 部份負載 ； Makeup Air Handling Unit ； Return Air ； part load

冷凍空調&能源科技

130期（2021 / 11 / 10）

20 - 29

繁體中文

本研究為某廠房內有一外氣空調箱（Makeup Air Handling Unit, MAU），須將戶外高溫高濕的空氣經空調箱處理後為乾球溫度20℃，相對濕度50%RH後，直接分配至三台製程空調箱使用。因製程空調箱每台需求風量由製程調控2000CMH上下之間的變化量進風，總供風量為6000CMH，故設計上外氣空調箱供氣的部份未與製程空調箱直接連結，而是將出風管延伸至製程空調箱進氣管附近，提供符合需求條件的溫濕度的空氣於周圍環境，以便由製程調控空調箱風車馬達依需求變頻吸入所需的風量。該空間由外氣空調箱處理完成之空氣直接洩漏於現場，使得該空間的溫濕度均維持於24～27℃65%RH形成一種無謂的能源浪費，且外氣空調箱於建廠時有將回風設計納入。故若能將供氣空間環境溫濕度取一部份作為回風使用將可減少外氣需求量，進而降低空調箱的冰水盤管負荷使用，達到節能效果。本研究將調整外氣空調箱的回風量比例，並分析該地區2020年外氣焓值變化，將原本處理完成後的冷空氣加以回風，探討該設備在全外氣運轉下，及在依外氣焓值調整回風比例混風後的能耗，可減少該空調箱全年度冰水盤管負荷144,931kW。且分析在使用150RT冰水主機運轉下，計算增加回風後，可減少主機負載46,056kWh／年，部份負載下能耗減少6.7%。

In this study, return air effect of make-up air handling unit(MAU) in a factory building was investigated. The outdoor high-temperature and high-humidity air must be processed by the MAU to have a dry bulb temperature of 20°C and a relative humidity of 50% RH. Then, the process air is directly distribute the supply air to three process air handling units(AHU) for use. Because the required supply air volume of each process AHU has to be controlled at about 2000CMH, the total air supply volume is 6000CMH for three AHU. The MAU is not directly connected to the process AHU, the air outlet duct of MAU extends to the vicinity of the air inlet duct of the process AHU to provide air with temperature and humidity in order to meet the required conditions in the surrounding environment. The fan motor of AHU can be controlled by the process to inhale the required air volume according to the demand. The air supply from MAU is directly leaked to the air conditioning space, so that the temperature and humidity of the air conditioning space can be maintained at 24~27℃ 65% RH, which leads to unnecessary energy waste. Therefore, if the return air from air conditioning space is introduced to MAU, the demand for outside air can be reduced, thereby reducing the energy consumption of the MAU and achieving energy-saving effects. This study evaluates the return air volume ratio of the MAU, in terms of the ambient enthalpy variations in 2020, and discuss the energy consumption after adjusting the return air proportion according to the outdoor air enthalpy value. By the return air control, the annual energy consumption of the MAU can be reduced by 144,931 kW. The results show that the load of 150RT chiller can be reduced by 46,056 kWh / year and the energy consumption can be reduced by 6.7% in part load operation.

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