Evaluation of evaporator performance for solar adsorption cooling system
List of Authors
  • Fauziah Jerai , Muhammad Azman Ramli

Keyword
  • adsorption cooling system, adsorber, coefficient of performance, specific cooling power, cooling capacity

Abstract
  • Due to the increasing of climate changes, the need for renewable energy sources is constantly increasing. The effect of climate changes can be solved by using environmental air-cooling system which is solar adsorption cooling system. In this context, water was selected as the working fluid. Adsorption systems can be activated by a heat source by using solar energy. Combination of water which is safe substance as working fluid and solar energy which clean and renewable energy will represent long term and friendly solution to this climate changes. There are few things that need to be measured in order to improve performance cooling system. The performance of evaporator is one of the major factors that affect the system's efficiency. In order to improve the system, the evaporator should be managed to give a maximum amount of evaporated refrigerant for the silica gel to adsorb. Further, an adsorption cooling system that used silica gel-water pair can be driven by utilizes solar energy or other low-grade waste. The result shows that temperature of the heat source is one of the most influential parameters for adsorption cooling system. The heat source for the system was set as low 50℃ as the current solar panel only can provide maximum to 60℃. The results show that the current heat exchangers also suitable to generate cooling power at 50℃ and 60℃.

Reference
  • 1. D. C. Wang, “Experimental research on novel adsorption chiller driven by low grade heat source,” vol. 48, pp. 2375–2381, 2007.

    2. F. Lanzerath, M. Erdogan, H. Schreiber, M. Steinhilber, A. Bardow (2014) Combination of finned tubes and thermal coating for high-performance water evaporation in adsorption heat pumps, Int. Sorption Heat Pump Conf. 1–10.

    3. H.B. Ma, P. Cheng, B. Borgmeyer, Y.X. Wang, (2008), Fluid flow and heat transfer in the evaporating thin film region, Microfluid. Nanofluidics 4, 237–243.

    4. Sabir HM, Bwalya AC. (2002) Experimental study of capillary-assisted water evaporators for vapor-absorption systems. Appl Energy, 45-57.

    5. Sharafian A, Dan PC, Huttema W, Bahrami M. (2016) Performance analysis of a novel expansion valve and control valves designed for a waste heat-driven two adsorber bed adsorption cooling system. Appl Therm Eng 5 May 2016;10-111.

    6. Poovanna Cheppudira Thimmaiah, Amir Sharafian, Wendell Huttema, Chantal Osterman, Ameer Ismail, Aashkaran Dhillon, Majid Bahrami. (2016), Performance of finned tubes used in a low-pressure capillary-assisted evaporator of adsorption cooling system. Applied Thermal Engineering. 106, 371–380.

    7. W. Li, X.Y. Wu, Z. Luo, S.C. Yao, J.L. Xu, (2011) Heat transfer characteristics of falling film evaporation on horizontal tube arrays, Int. J. Heat Mass Transf. 54, 1986–1993.

    8. Xia ZZ, Yang GZ, Wang RZ. (2008) Experimental investigation of capillary-assisted evaporation on the outside surface of horizontal tubes. Int J Heat Mass Transf, 51-54.