Evaluation of the energy utilization index in sheep milk cooling systems

Cossu, Marco ORCID logoORCID: https://orcid.org/0000-0002-0144-3669, Ledda, Luigi ORCID logoORCID: https://orcid.org/0000-0001-5337-5701, Solinas, Stefania ORCID logoORCID: https://orcid.org/0000-0003-1123-3304, Cossu, Andrea ORCID logoORCID: https://orcid.org/0000-0003-4086-8640 and Pazzona, Antonio (2020) Evaluation of the energy utilization index in sheep milk cooling systems. Energies, 13 (9) , 2127. ISSN 1996-1073 [Article] (doi:10.3390/en13092127)

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The energy consumption of sheep milk cooling systems (MCSs) was quantified in this study to provide original information filling a literature gap on the impact of sheep milk cooling on the energy and economic balance in dairy farms. Performance and energy monitoring tests were conducted simultaneously on 22 MCSs in Sardinia (Italy). The results determined the cooling time as a function of the performance class and number of milkings. The Energy Utilization Index (EUI) was applied to measure the energy required to cool down the milk and estimate the incidence on its price. The average EUI was 1.76 kWh 100 L−1 for two-milkings and 2.43 kWh 100 L−1 for four-milkings MCSs, whereas the CO2 emissions ranged from 998 to 1378 g CO2 100 L−1 for two- and four-milkings MCSs, respectively. The estimated energy consumption for the storage of refrigerated sheep milk was 0.12 kWh 100 L−1. The malfunctioning MCSs averagely consumed 31% more energy than regular systems. The energy cost for cooling accounted for 0.61% on the current sheep milk price in Italy. Based on the analysis, the reported EUI values can be used as a preliminary indicator of the regular operation of MCSs.

Item Type: Article
Additional Information: This article belongs to the Section Electrical Power and Energy System.
Keywords (uncontrolled): Refrigeration, dairy, tank, energy saving, CO2 emissions
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 29785
Notes on copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.
Useful Links:
Depositing User: Andrea Cossu
Date Deposited: 29 Apr 2020 07:31
Last Modified: 15 May 2020 11:14
URI: https://eprints.mdx.ac.uk/id/eprint/29785

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