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標題: 一個多床吸附式熱泵在非等模式操作時間下之性能
Performance of a Multi-bed Adsorption Heat Pump Operating at Unequal Mode Times
作者: 林俊宏
Lin, Jun-Hong
關鍵字: adsorption heat pump;吸附式熱泵;COP;specific cooling power;冷卻性能係數;冷卻能力
出版社: 機械工程學系所
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本研究以模擬分析與實驗量測探討一個具有四個吸附器之吸附式熱泵在等或非等過程時間操作下之冷卻性能係數(COP)與冷卻能力(Q)。分析中使用具固體側質傳阻抗之模式,吸附劑與冷媒分別為SWS-1L複合吸附劑與水,在非等過程時間操作下,再生時間 乃考慮與吸附時間 相同,而預熱時間 則與預冷時間 相等。分析中分別改變週期時間、各過程操作時間、整體熱傳係數與再生溫度,以探討不同之操作條件對系統之COP與Q之影響。分析之結果顯示,等過程時間之操作,無法同時使COP與Q均達到較大之數值;而在非等過程時間之操作下,於較短預熱時間之情形下,除了Q較大外,且COP亦處於較高之範圍。在U=4.0 W/m -K與T=100℃時,以非等過程時間之操作替代等過程時間之操作,系統之Q可以提昇達131.8%,而相對之COP則可以提昇達45.8%。實驗部分主要針對等過程時間之操作,量測結果顯示,系統最大之Q與COP分別僅約為55與0.1左右,文中針對造成此量測結果遠低於分析結果之原因進行討論。

This work deals with a computer analysis and an experimental measurement of the COP and specific cooling power (Q) of a four-bed adsorption heat pump. The heat pump was considered to operate at equal mode time or unequal mode times. For unequal-mode-time operations, the regeneration time is the same as the adsorption time and the preheating time is the same as the precooling time. A solid-side mass-diffusion resistance model was adopted and the adsorption pair is a composite adsorbent and water. The effects of cycle time, individual mode times (τ), overall heat transfer coefficient (U) and regeneration temperature (T) on the COP and Q were investigated. The computer result reveals that, as the preheating/precooling time is much shorter than the regeneration/adsorption time, both the COP and Q can be at a high level. For equal-mode-time operations, as the COP is high, the Q will be low, and vice-versa. At the U of 4.0 W/m -K and T of 100℃, under unequal-mode-time operation, the Q and COP can be upgraded by 131.8% and 45.8% respectively. The result of the experimental measurement reveals that the maximum Q and COP are only 55 and ~ 0.1 respectively. The reasons resulting in this low performance were discussed.
其他識別: U0005-1408200817391000
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