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標題: 蒸發器內冷媒之循環對一個吸附式熱泵之冷卻性能之影響
Effect of refrigerant recirculation on cooling performance of an adsorption heat pump
作者: 鄭鼎偉
Zheng, Ding-Wei
關鍵字: 吸附式熱泵;adsorption heat pump;冷卻能力;性能係數;矽膠;specific cooling power;COP;silica gel
出版社: 機械工程學系所
引用: [1] R.J.H. Grisel , S.F. Smeding, R.d. Boer,“ Waste heat driven silica gel/water adsorption cooling in trigeneration”, Applied Thermal Engineering, Vol. 30, pp. 1039–1046, 2010. [2] W.S. Loh , I.I. El-Sharkawy , K.C. Ng , B.B. Saha ,“Adsorption cooling cycles for alternative adsorbent/adsorbate pairs working at partial vacuum and pressurized conditions”, Applied Thermal Engineering, Vol. 29, pp. 793–798, 2009. [3] Y. Hirota , Y. Sugiyama , M. Kubota , F. Watanabe ,N. Kobayashi , M.Hasatani,M.Kanamori,“Development of a suction-pump-assisted thermal and electrical hybrid adsorption heat pump”, Applied Thermal Engineering, Vol. 28,pp. 1687–1693, 2008. [4] J.Y. San , W.M. Lin,“Comparison among three adsorption pairs for using as the working substances in a multi-bed adsorption heat pump”, Applied Thermal Engineering, Vol.28,pp. 988–997, 2008. [5] T. Nunez , W. Mittelbach , H.M. Henning ,“Development of an adsorption chiller and heat pump for domestic heating and air-conditioning applications”, Applied Thermal Engineering, Vol. 27,pp.2205-2212, 2007. [6] T. Miyazaki , A. Akisawa,“The influence of heat exchanger parameters on the optimum cycle time of adsorption chillers”, Applied Thermal Engineering, Vol. 29,pp. 2708–2717, 2009. [7] M. Kubota , T. Ueda , R. Fujisawa , J. Kobayashi , Fujio Watanabe , Noriyuki Kobayashi , Masanobu Hasatani ,“Cooling output performance of a prototype adsorption heat pump with fin-type silica gel tube module”, Applied Thermal Engineering, Vol. 28,pp. 87-93, 2008. [8] B.N. Okunev , A.P Gromov , V.L. Zelenko , I.S. Glaznev , D.S. Ovoshchnikov , L.I Heifets ,“Effect of residual gas on the dynamics of water adsorption under isobaric stages of adsorption heat pump : Mathematical modeling”, International Journal of Heat and Mass Transfer, Vol. 53,pp.1283-1289, 2010. [9] R.Z. Wang , Z.Z. Xia , L.W. Wang , Z.S. Lu , S.L. Li , T.X. Li , J.Y. Wu , S. He ,“Heat transfer design in adsorption refrigeration systems for efficient use of low-grade thermal energy”, Energy, Vol. 36,pp.5425-5439, 2011. [10] Z. Xia , D. Wang , J. Zhang ,“Experimental study on improved two-bed silica gel–water adsorption chiller”, Energy Conversion and Management , Vol.49,pp.1469-1479, 2008. [11] D.C. Wang , J.Y. Wu , Z.Z. Xia , H. Zhai , R.Z. Wang , W.D. Dou ,“Study of a novel silica gel–water adsorption Chiller.Part II. Experimental study”, International Journal of Refrigeration, Vol.28,pp1084-1091, 2005. [12] X. Wang , H.T. Chua , K.C. Ng ,“Experimental investigation of silica gel-water adsorption chillers with and without a passive heat recovery scheme”, International Journal of Refrigeration, Vol.28,pp756-765, 2005. [13] 林永宸,一個具四個吸附器之吸附式熱泵之分析與測試,碩士論文,中興大學機械系,2009.
本研究藉由實驗量測來探討一個具四個鰭管式吸附器之熱泵之冷卻能力(SCP)與性能係數(COP)。研究中所使用之吸附劑為矽膠,冷媒為水,系統在分別考慮兩種不同裝置情形下,以進行性能測試。測試之結果顯示,於蒸發器內未裝置循環泵浦之情況下,最佳操作之週期時間為32分鐘,此時熱泵之最大SCP值為70.6 W/kg-矽膠,而所對應之COP值為0.65;在蒸發器內裝置循環泵浦之情況下,此時最佳操作之週期時間縮短為20分鐘,而最大SCP值為75.2 W/kg-矽膠,所對應之COP值則為0.53,兩者相比較下,後者之SCP值可提昇6.52 %,但COP值則會因而降低。在此實驗之過程中亦發現,蒸發器中之銅管長度可能不夠,飛濺之水滴有流入吸附器之跡象,同時冷凝器中之冷凝效果亦有不足之現象,此三個原因可能致使整個熱泵系統之性能亦隨之受限。

This work experimentally investigated the specific cooling power (SCP) and coefficient of performance (COP) of a newly developed adsorption heat pump containing four fin-tube adsorbers. The adsorption pair were silica gel and water. In the experiment, two different operating conditions were considered. The result shows that, for the operation without a water circulation pump in the evaporator, the optimal cycle time is 32 minutes. The maximum SCP value is 70.6 W/kg-silica gel and corresponding COP value is 0.65;For the operation with a circulation pump, the optimal cycle time reduces to 20 minutes. The maximum SCP value is 75.2 W/kg-silica gel and corresponding COP value is 0.53. Installing the circulation pump results in a 6.52% increase in the maximum SCP value, but the COP value is decreased. The experiment result also reveals that the length of the copper tube in the evaporator maybe too short. Liquid water droplet might directly flow into the adsorber. In addition, the condensation performance of the condenser is not as expected. These three reasons might affect the performance of the adsorption heat pump.
其他識別: U0005-0711201215303200
Appears in Collections:機械工程學系所

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