Effective Maintenance Management Strategies for Air-conditioning Systems in Administrative Offices

Abstract

The persistent failure of air conditioning systems in institutional settings, particularly in the exams and records office of the Mechanical Engineering Department at Rivers State University, has revealed not only technical inefficiencies but also critical lapses in management and maintenance planning. In Port Harcourt’s humid, high-temperature climate, these failures result in inadequate cooling, elevated energy expenditures, and risks to the preservation of sensitive academic documents, issues that demand both technical and administrative intervention. This study investigates the management and maintenance strategies required to ensure the reliable operation of air conditioning systems in such settings. A case-based approach was adopted, involving the repair and rehabilitation of a split-unit air conditioner, with the dual aim of restoring cooling efficiency and developing a sustainable facility management framework. The methodology included systematic diagnostic testing (pressure, temperature, and energy usage analysis), targeted component replacement (compressor, R410A refrigerant, capillary tube, thermostatic expansion valve, and filter drier), and routine maintenance procedures such as coil cleaning. Thermodynamic performance was assessed using pressure-enthalpy diagrams and heat transfer modeling to validate results. Performance outcomes showed a significant improvement: the coefficient of performance (COP) increased from 4.5 to 6 after repairs, discharge air temperature reduced from 28 to 22°C, and energy consumption dropped from 1.8 to 1.2 kW. Pressure readings normalized to 65 psi (suction) and 280 psi (discharge), confirming restored operational efficiency. Crucially, a structured preventive maintenance plan and resource management schedule were developed and implemented, leading to a 46% reduction in projected annual maintenance and energy costs. By integrating both engineering and management principles, this study presents a replicable, cost-effective framework for managing and maintaining split-unit air conditioning systems in institutional environments. It highlights the importance of proactive maintenance planning, resource optimization, and environmental sustainability in ensuring long-term operational reliability and cost control in facilities management, particularly within the context of academic institutions in tropical regions.