Thermodynamic Analysis of Heat and Mass Transfer Enhancement for R134a-DMAC/CNT Vapour Absorption Refrigeration System

Abstract:

The objective of this paper is to study thermodynamic analysis of R134a-DMAC and R134a-DMAC/CNT vapour absorption system and compare this both system performance. This investigation for R134a-DMAC is carried out based on the correlations available in the literature. The change of thermophysical properties for R134a-DMAC/CNT is predicted and is incorporated in the pure R134a-DMAC correlations. The analysis is carried for 1 kW evaporator capacity and effectiveness of solution heat exchanger is taken as 0.8. Variations in the performance parameters of the system with and without nano fluids are studied against various operating temperatures of generator, absorber and different volume concentration. The result of this theoretical study shows that co-efficient of performance (COP) of system with CNT nano fluid is improved as well as the absorber capacity also increased due to enhanced heat transfer of nano fluids. It also observed that the performance achieved by the pure R134a-DMAC at the elevated generator temperature could be achieved at low generator temperature using R134a-DMAC/CNT.

• Periodical: Applied Mechanics and Materials (Volumes 592-594)
• Pages: 1832-1836
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.592-594.1832
• Online since: July 2014
• Authors: A. Kathiravan, E. Karthikeyan, V. Mariappan, Chidambaram T. Muthiah
• Keywords: Absorber Temperature, Absorption Refrigeration, CNT (Carbon Nanotube), DMAC (Dimethyl Acetamide), Generator Temperature, Thermodynamics Analysis

References

[1] Pongsid Srikhirin , Satha Aphornratana and Supachart Chungpaibulpatana: A Review of absorption technologies, Renewable and Sustainable Energy Reviews 5 (2001) 343–372.

DOI: 10.1016/s1364-0321(01)00003-x

[2] C.W. Chan*, J. Ling-Chin and A.P. Roskilly: A review of chemical heat pumps, thermodynamic cycles and thermal energy storage technologies for low grade heat utilization, Applied Thermal Engineering 50 (2013) 1257-1273.

DOI: 10.1016/j.applthermaleng.2012.06.041

[3] Z. Crepinsek, D. Goricanec and J. Krope: Comparison of the performances of absorption refrigeration cycles, Wseas transactions on heat and mass transfer.

[4] V. Muthu, R. Saravanan: Experimental studies on R134a – DMAC hot water based vapor absorption. International Journal of Thermal Sciences (2007), pp.175-181.

DOI: 10.1016/j.ijthermalsci.2007.02.004

[5] Subhadip roy, M.P. Maiya: Analysis of R134a-DMAC vapour absorption refrigeration system with add on components. International Journal of Sustainable Built Environment (2012), p.26–35.

DOI: 10.1016/j.ijsbe.2012.04.001

[6] L. Harikrishnan, M. P. Maiya, S. Tiwari, A. Wohlfeil and F. Ziegler: Heat and mass transfer characteristics of absorption of R134a into DMAC in a horizontal tube absorber, Heat Mass Transfer, (2009. )Vol 45, p.1483–1491.

DOI: 10.1007/s00231-009-0520-y

[7] A. Zohar, M. Jelinek, A. Levy and I. Borde: Performance of diffusion absorption refrigeration cycle with organic working fluids, International Journal of Refrigeration, (2009) Vol 32, pp.1241-1246.

DOI: 10.1016/j.ijrefrig.2009.01.010

[8] V. Mariappan , M. Udayakumar, Pratisthit Lal Shrestha and S. Suresh: THERMODYNAMIC ANALYSIS OF R134A – DMAC VAPOR ABSORPTION REFRIGERATION (VAR) SYSTEM, International Journal Of Computational Engineering Research / ISSN: 2250–3005.

[9] Ravikanth S. Vajjha and Debendra K. Das: Experimental determination of thermal conductivity of three nanofluids and development of new correlations, International Journal of Heat and Mass Transfer 52 (2009) 4675–4682.

DOI: 10.1016/j.ijheatmasstransfer.2009.06.027

[10] Khalil Khanafer and Kambiz Vafai: A critical synthesis of thermo physical characteristics of nanofluids, International Journal of Heat and Mass Transfer 54 (2011) 4410–4428.

DOI: 10.1016/j.ijheatmasstransfer.2011.04.048

[11] S.M.S. Murshed, K.C. Leong and C. Yang: Thermophysical and electrokinetic properties of nanofluids – A critical review Applied Thermal Engineering 28 (2008) 2109–2125.

DOI: 10.1016/j.applthermaleng.2008.01.005

[12] Jin Ki Lee, Junemo Koo, Hiki Hong and Yong Tae Kang: The effects of nanoparticles on absorption heat and mass transfer performance in NH3/H2O binary nanofluids, internaTional journal of refrigeration 33(2010) 269-275.

DOI: 10.1016/j.ijrefrig.2009.10.004

[13] V. Mariappan, M. Udayakumar, S. Suresh, R. B. Anand and Kulkarni shrikant chandrakant: Thermodynamic Analysis Of R134a – Dmac/ Al2o3 Vapor Absorption Refrigeration System, International Conference on Advance Research in Mechanical, Aeronautical and Civil (Sep 7, 2013) Pattaya.

DOI: 10.1109/fame.2010.5714804

[14] I. Borde, M. Jelinek, NC. Daltrophe, 1995. Absorption based on R-134a. International Journal of Refrigeration, Vol 18, p.387–394.

DOI: 10.1016/0140-7007(95)98161-d

[15] Yokozeki, A, 2005. Theoretical performances of various refrigerant–absorbent pairs in a vapor-absorption refrigeration cycle by the use of equations of state. Applied Energy, Vol 80(4), p.383 – 399.

DOI: 10.1016/j.apenergy.2004.04.011

[16] B.C. Pak and Y.I. Cho: Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles, Expt. Heat Transfer 11 (2) (1998) 151–170.

DOI: 10.1080/08916159808946559

[17] Y. Xuan and W. Roetzel: L Conceptions for heat transfer correlation of nanofluids, Int. J. Heat Mass Transfer 43 (19) (2000) 3701–3707.

DOI: 10.1016/s0017-9310(99)00369-5