Title: Performance optimisation of serial chilled water system under m-out-of-n: G policy

Authors: Ibrahim Yusuf; Abdullahi Sanusi; Mus'abu Musa; Surajo Sulaiman

Addresses: Department of Mathematical Sciences, Bayero University, Kano, Nigeria ' School of Continuing Education, Bayero University, Kano, Nigeria ' Department of Mathematics, Faculty of Physical Sciences, Kebbi State University of Science and Technology, Aliero, Kebbi State, Nigeria ' Department of Mathematics, Yusuf Maitama Sule University, Kano, Nigeria

Abstract: The present paper aimed at examining the performance of a multi-station chiller water system in terms of availability, reliability, mean time to failure (MTTF), sensitivity and expected profit under two types of repairs for rectifying non-lethal and lethal failure. Supplementary variable technique and Laplace transforms are used to establish and resolved the differential equations associated with transition diagram, which are essential to this research. The numerical validation of explicit expressions for system availability, reliability, MTTF, MTTF sensitivity, and profit function is performed. The results show that, the performance of the chiller system can be maximised by implementing m-out-of-n: G policy and adopting Type II (copula) repair restoring the system to perfect state. As a result, the findings of this research are thought to be valuable for analysing performance and determining the best system design and feasible maintenance strategies that may be used in the future to improve system performance.

Keywords: availability; performance; copula; chiller; optimisation; mean time to failure; MTTF.

DOI: 10.1504/IJPMB.2024.136480

International Journal of Process Management and Benchmarking, 2024 Vol.16 No.3, pp.376 - 399

Received: 28 Dec 2022
Accepted: 29 Dec 2022
Published online: 02 Feb 2024 *

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