Benchmarking techno-economic performance of greenhouses with different technology levels in a hot humid climate.

Greenhouse agriculture is expected to play a critical role in sustainable crop production in the coming decades, opening new markets in climate zones that have been traditionally unproductive for agriculture. Extreme hot and humid conditions, prevalent in rapidly growing economies including the Arabian Peninsula, present unique design and operational challenges to effective greenhouse climate control. These challenges are often poorly understood by local operators and inadequately researched in the literature. This study addresses this knowledge gap by presenting, for the first time, a comprehensive set of benchmarks for water and energy usage, CO 2 emissions (CO 2 e) contribution, and economic performance for low-, mid-, and high-tech greenhouse designs in such climates. Utilising a practical and adaptable model-based framework, the analysis reveals the high-tech design generated the best results for economic return, achieving a 4.9-year payback period with superior water efficiency compared to 5.8 years for low-tech and 7.0 years for mid-tech; however, the high-tech design used significantly more energy to operate its mechanical cooling system, corresponding with higher CO 2 e per unit area (8.3 and 4.0 times higher than the low- and mid-tech, respectively). These benchmarks provide new insights for greenhouse operators, researchers, and other stakeholders, facilitating the development of effective greenhouse design and operational strategies tailored to meet the challenges of hot and humid climates. • First comprehensive benchmarks for greenhouse performance in hot humid climates. • Practical model-based framework assesses greenhouses of various tech-levels. • Existing greenhouse tech with optimisations is economically viable in coastal Arabia. • Inefficient evaporative cooling and high CAPEX make mid-tech worst investment. • High-tech shows best payback period and water efficiency but worst CO 2 impact. [ABSTRACT FROM AUTHOR]