Performance Comparison Between Cycle1(Equal Bed) and Cycle2(Unequal Bed)

Gulshan Khatun, Md. Zafar Iqbal Khan

Abstract


The performance comparison of CC, COP and waste heat recovery efficiency (η) of cycle1 (equal bed) and cycle2 (unequal bed)  has been numerically discussed in this paper. In the present numerical solution, the heat source temperature variation are taken from 50°C to 70°C (for both cycle) and along with coolant inlet temperature at 30°C and the chilled water inlet temperature at 14°C. Silica gel-water is chosen as adsorbent-refrigerant pair. In the new strategy, mass recovery process occurs in all beds. In cycle1, the configuration of beds in the three bed chiller with mass recovery were taken as uniform in size but in cycle2, the configuration of Hex3 is taken as half of Hex1 or Hex2(where Hex1 and Hex2 are identical). A cycle simulation computer program is constructed to analyze the influence of operating conditions (hot and cooling water temperature) on COP (coefficient of performance), CC (cooling capacity). The performances in terms of cooling capacity (CC) and coefficient of performances (COP) are compared with those of conventional three-bed mass recovery scheme. Results show that the cooling capacity (CC),  coefficient of performance (COP) and chiller efficiency (η) of the proposed cycle1 is much better than that of the proposed cycle2 in the range of heat source temperature from 50°C to 70°C. 


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References


B. B. Saha, A. Akisawa, & T. Kashiwagi, “Solar/waste heat driven two-stage adsorption chiller: The Prototype”, Renewable

Energy, 23(4),Pp.93-101.2001.

M. Z. I. Khan, B. B. Saha, K. C. A. Alam, A. Akisawa, & T. Kashiwagi, “Performance investigation on mass recovery threebed

adsorption cycle”, International Conference on Mechanical Engineering, Pp.28-30.2005.

M. Z. I. Khan, S. Sultana, A. Akisawa, & T. Kashiwagi, “Numerical simulation of advanced adsorption refrigeration chiller

with mass recovery”, Journal of Naval Architecture and Marine Engineering, 3(2),Pp.59-67.2006.

B. B. Saha, S. Koyama, T. Kashiwagi, A. Akisawa, K. C. Ng, & H. T. Chua, “Waste heat driven dual-mode, multi-stage

multi-bed regenerative adsorption system”, International Journal of Refrigeration, 26, Pp.749-757.2003.

S.V. Shelton, J.W. Wepfer, & D. J. Miles, “Ramp Wave Analysis of the Solid/Vapor Heat Pump”, ASME Journal Energy

Resources Technology, 112, Pp.69-78.1990.

R. Z. Wang, “Performance Improvement of Adsorption Cooling by Heat and Mass Recovery”, International Journal of

Refrigeration, 24, Pp.602–611.2001.

K. C. A. Alam, A. Akahira, Y. Hamamoto, A. Akisawa, & T. Kashiwagi, “A four-bed mass recovery adsorption refrigeration

cycle driven by low temperature waste/renewable heat source”, Renewable Energy, 29, Pp.1461–1475.2004.

B. B.Saha, S. Koyama, K. C. Ng, Y. Hamamoto, A. Akisawa, & T. Kashiwagi,“ Study on a dual-mode, multi-stage, multibed

regenerative adsorption chiller”, Renewable Energy, 31(13), Pp.2076-2090.2006.

M. Z. I. Khan, B. B. Saha, & A. Akisawa, “Experimental study on a three-bed adsorption chiller. International Journal of Air-

Conditioning and Refrigeration”, 19(4), Pp.285–290.2011.

H. T. Chu, K. C. Ng, W. Wang, C. Yap, & X. L. Wang, “Transient modeling of a two-bed silica gel-water adsorption

chiller”, International Journal of Heat Mass Transfer, 47, Pp.659–669.2004.

K.C. Ng, H. T. Chu, C.Y. Chung, C.Y. Loke, T. Kashiwagi, A. Akisawa, & B. B. Saha, “Experimental investigation of the

silica gel-water adsorption isotherm characteristics”, Applied Thermal Engineering, 21, Pp.1631–1642.2001.




DOI: http://dx.doi.org/10.52155/ijpsat.v29.2.3748

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