Title: Energy, exergy and exergoeconomic analysis of high temperature short time milk pasteurisation plant

Authors: Gurjeet Singh; P.J. Singh; Vineet V. Tyagi; P. Barnwal; A.K. Pandey

Addresses: Department of Mechanical Engineering, Punjab Engineering College, Chandigarh, 160012, India ' Department of Mechanical Engineering, Punjab Engineering College, Chandigarh, 160012, India ' School of Energy Management, Shri Mata Vaishnao Devi University, Jammu, 180001, India ' Dairy Engineering Division, ICAR-National Dairy Research Institute, Karnal, 132001, India ' Research Centre for Nano-Materials and Energy Technology (RCNMET), Sunway University, Bandar Sunway, 47500 Malaysia

Abstract: India produces 19.54% of the total annual milk production of the entire world (819 MT) with yearly rise of 3.6%. The thermal and electrical energies consume 10%-20% of manufacturing cost of pasteurised milk. In the present work, energy, exergy and exergoeconomic appraisals of skim milk pasteurisation plant have been performed. The exergy gauge registered an exergy efficiency of 68.84% with 35% exergy recovery potential. The analysis revealed that relative irreversibility ratio of regeneration-3 (7.87%) was higher than regeneration-2 (4.24%) followed by regeneration-1 (1.25%), which represented their excellent sustainability characteristics. The thermoeconomic analysis has identified the immensity of exergoeconomic indices such as total operating cost rate, exergoeconomic factor and percentage relative cost difference. The exergoeconomic factor was reported to be most significant in holding coil (62.45%), heat exchanger (49.25%) and regeneration-1 (20.18%). The high and low values of exergoeconomic factor magnify the role of capital investment and thermodynamic inefficiencies respectively.

Keywords: exergy efficiency; exergy destruction ratio; high temperature short time pasteurisation; specific exergy destruction; specific exergy consumption; thermoeconomic analysis; exergoeconomic factor; total operating cost rate.

DOI: 10.1504/IJEX.2019.101626

International Journal of Exergy, 2019 Vol.30 No.1, pp.26 - 62

Received: 20 Jun 2018
Accepted: 18 Dec 2018

Published online: 16 Aug 2019 *

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