摘 要
本文以三維數值模擬方式探討對以矽膠-水為吸附劑-冷煤組合之固體吸附式冷凍系統之吸附床熱交換器內之熱質傳遞現象對冷凍能力之影響。本文數值模擬主要參數包括：培克萊特數 ；脫附/吸附運轉週期設為相同 163、816、1279、1631和2361；單位吸附床個數 和10。數值結果顯示吸附床內吸附劑單位質量製冷能力SCP和冷凍性能係數COP等相關熱性能指標皆與培克萊特數及脫附/吸附運轉週期存在極大的相關聯性。

Abstract
Numerical simulations via a three-dimensional heat and mass transfer model for a gel-water adsorption heat exchanger of a solid-adsorption chiller system were presented to unravel the transport phenomena induced in the adsorption/desorption processes. Specifically, parametric simulations have been undertaken for the relevant dimensionless parameters of the problem in the following ranges: the Peclet number, Pe = 100 ~ 1000; the dimensionless time periods of the adsorption and desorption processes during a cycle operation are set to be identical at, = = 163, 816, 1279, 1631; and the numbers of unit adsorption bed, N = 5 and 10. Numerical results clearly reveal that the thermal performance indices, such as specific cooling power SCP and the coefficient of performance of refrigeration COP, of the solid-adsorption system exhibit a strong bearing with the Peclet number as well as the time period of adsorption/desorption process.

參考文獻
【1】 Sakoda, A. and Suzuki, M., “Simultaneous Transport of Heat and Adsorbate in Closed Type Adsorption Cooling System Utilizing Solar Heat”, J. of Solar Energy Engineering, Vol. 108, pp. 239-245, 1986.

【2】 Mamiya, T. and Nikai, L., “Study on Heat Transfer in Tube Plate Adsorption Reactor”, Proceedings of the International Absorption Heat Pump Conference, ASME, Vol. 31, pp. 425–31, 1993.

【3】 Zhang, L. Z., “A Three-Dimensional-Equilibrium Model for an Intermittent Adsorption Cooling System”, Solar Energy, Vol. 69, No. 1, pp. 27–35, 2000.

【4】 Chang, W.-S., Wang, C.-C., and Shieh, C.-C., “Experimental Study of a Solid Adsorption Cooling System Using Flat-Tube Heat Exchangers as Adsorption Bed”, Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan, 2004.

【5】 Saha, B.B., Akisawa, A., and Kashiwagi, T., “Computer Simulation of a Silica Gel-Water Adsorption Refrigeration Cycle - The Influence of Operating Conditions on Cooling output and COP”, ASHRAE Transactions: Research, Vol. 101, No. 2, pp. 348-357, 1995.

【6】 Saha, B.B., Akisawa, A., and Kashiwagi, T., “Experimental Investigation of a Silica Gel-Water Adsorption Refrigeration Cycle - The Influence of Operating Conditions on Cooling output and COP”, ASHRAE Transactions: Research, Vol. 101, No. 2, pp. 358- 366, 1995.

【7】 Alam, K.C.A., Saha, B.B., Kang, Y.T., Akisawa, A., and Kashiwagi, T., “Heat Exchanger Design Effect on the System Performance of Silica Gel Adsorption Refrigeration Systems”, Int. J. Heat and Mass Transfer, Vol. 43, No. 24, pp. 4419-4431, 2000.

【8】 Alam, K.C.A., Saha, B.B., Kang, Y.T., Akisawa, A., and Kashiwagi, T., “A Novel Approach to Determine Optimum Switching Frequency of a Conventional Adsorption Chiller”, Energy, Vol. 28, pp. 1021-1037, 2003.

【9】 Leong, K.C. and Liu, Y., “Numerical Modeling of Combined Heat and Mass Transfer in the Adsorbent Bed of a Zeolite/Water Cooling System”, Applied Thermal Engineering, Vol. 24, pp. 2359-2374, 2004.

【10】 Leong, K.C. and Liu, Y., “Numerical Study of a Combined Heat and Mass Recovery Adsorption Cooling Cycle”, Int. J. of Heat and Mass Transfer, Vol. 47, pp. 4761-4770, 2004.

【11】 Chua, H.T., Ng, K.C., Malek, A., Kashiwagi, T., Akisawa, A., and Saha, B.B., “Modeling the Performance of Two-Bed, Silica Gel-Water Adsorption Chiller”, Int. J. of Refrigeration, Vol. 22, pp. 194-204, 1999.

【12】 Chua, H.T., Ng, K.C., Wang, W., Yap, C., and Wang, X.L., “Transient Modeling of a Two-Bed Silica Gel-Water Adsorption Chiller”, Int. J. Heat Mass Transfer, Vol. 47, pp. 659-669, 2004.

【13】 Purday, H. F. P., An Introduction to the Mechanics of Viscous Flow, Dover, New York, 1949.

【14】 Reid, R. C., Prausnitz, J. M., and Sherwood, Th. K., The Properties of Gases and Liquids, McGraw Hill, 1977.