Optimizing Energy and Water Efficiency in Aircraft Hangars Through High-SEER HVAC Systems and Chilled Condensate Reuse: A Sustainable Design Approach for Arid Regions

Aircraft hangars in arid regions such as Oman represent high energy demand facilities due to their large volume, high ventilation rates, and continuous cooling requirements. This paper presents a sustainable HVAC design strategy focused on energy efficiency and water conservation, aligned with Oman Vision 2040 and global decarbonization goals. The proposed approach integrates multiple techniques to optimize system performance and reduce environmental impact. High Seasonal Energy Efficiency Ratio (SEER) air-conditioning units are selected to reduce cooling energy consumption. Additionally, well-insulated building envelopes are employed to minimize external heat gain and source load. To ensure indoor air quality (IAQ) without increasing energy demands, an energy recovery ventilation system is implemented using a rotary energy recovery wheel. A novel feature of the design includes the collection and reuse of chilled water condensate, a byproduct of the cooling and dehumidification process. This water is repurposed for non-potable uses within the facility, contributing to water savings and sustainability. This paper investigates the potential of sustainable HVAC strategies to support building decarbonization by focusing on two key approaches: the optimal selection of high-efficiency air conditioning units and the effective recovery and reuse of condensate water. Typically, aircraft hangar HVAC systems can generate 258,927 litres yearly, depending on indoor and ambient conditions. By adopting high-efficiency units, operational cost savings of up to 50% or more can be achieved based on the optimal selection of high-efficiency air conditioning units. Additionally, utilizing this freely available condensate water can significantly reduce freshwater consumption, and minimize related carbon emissions. The results provide a practical model that can be easily used and repeated for applying sustainable HVAC systems in aircraft hangars and other associated aeronautical large buildings that run in hot, dry climates.