A Combined Energy–Exergy Approach for Improving Refrigeration Systems in Deep-Level Gold Mines: Method Development and Case Study Validation

Increased economic pressure and rising electricity costs are driving energy efficiency initiatives on deep-level mines. One of the major energy consumers on deep-level mines is the refrigeration system, which supplies chilled water for cooling the underground working environment. Due to the outdated nature of these systems, and their fixed supply capacities, they are prone to energy wastage through inefficient operation. Previous studies have suggested energy- or exergy analyses to improve performance; however, a combined approach has not been implemented on a deep-level mine. A methodical approach is needed to apply thermodynamic analysis techniques to refrigeration systems for improved performance. This study develops and applies such a method to a South African mine’s refrigeration system. This application results in a lower condenser temperature with an increase in the COP of the refrigeration plants, with no significant capital input or additional infrastructure needed. This translates to an annual cost saving of R1.35 million for the mining shaft.

Grantor dc:publisher

Stellenbosch : Stellenbosch University

Year dc:date.issued

2026

Author dc:creator

• Du Randt, Johannes Claudius

Advisors dc:contributor.advisor

• Schutte, Corne
• Van Laar, Jean

Language dc:language.iso

en

Repository record dc:identifier.uri

https://scholar.sun.ac.za/handle/10019.1/135774

OAI identifier oai:identifier

oai:scholar.sun.ac.za:10019.1/135774