Energy saving techniques for reducing the heating cost of conventional greenhouses

Abstract

Reducing heating cost is a major challenge for greenhouses growers especially those located in cold regions. Several techniques have been applied to reduce greenhouse heating costs in winter season. This study presents a comprehensive review of different energy saving techniques that can be applied to reduce heating costs including energy-efficient greenhouse designs, use of energy-efficient covers, use of thermal curtains, energy-efficient management of indoor microclimates, selection of energy-efficient heating system, and the potential of using alternative energy sources. The energy saving potential of different design parameters (shape, orientation) depends greatly on the location, and the energy-saving potential of most passive heating systems (water tanks, rock bed) may not be feasible for commercial greenhouses production in cold regions. Alternative energy sources such as industrial waste heat, geothermal energy, and wood biomass could be a suitable option to reduce the greenhouse heating cost for large-scale production. However, it is important to consider the trade-offs between the agronomic need of plants and energy-saving potential of various energy-saving techniques, also the economic feasibility of energy saving systems in greenhouses. It can be concluded that this study could be useful for greenhouse growers, researchers, and manufacturer for creating sustainable energy-efficient greenhouse production in cold regions.