Light‐limited photosynthesis under energy‐saving film decreases eggplant yield

Chavan, Sachin G.; Maier, Chelsea; Alagöz, Yağiz; Filipe, João C.; Warren, Charles R.; Lin, Han; Jia, Baohua; Loik, Michael E.; Cazzonelli, Christopher I; Chen, Zhong‐Hua; Ghannoum, Oula; Tissue, David T.

doi:10.1002/fes3.245

Cited by 34 publications

(57 citation statements)

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“…Daily and average energy consumption across four combinations are compared as a basis for developing an optimal cooling strategy for energy management. An optimal cooling strategy for energy management using multi-temperature acquisition points for opening/closing of vents and shade screens could be used to extend the overall energy consumption profile of the selected protected cropping facility [16,23]. These studies form the basis for setting the opening or closing of vents, using the most reliable temperature measurements within the facility, to reduce energy costs during 6-9 months of cropping cycles.…”

Section: Greenhouse Hardware and Softwarementioning

confidence: 99%

“…Many researchers across continents have compared the energy use between open field cultivation and protected cropping [12][13][14][15]. They have also investigated various heat-filtering film coverings for greenhouse crop production [16][17][18] and developed prediction models of protected cropping energy consumption [19][20][21][22]. These investigations have shown consistent results in response to the effective management of energy consumption through temperature prediction, the introduction of new greenhouse covering materials, glass coatings, and the use of renewable energy sources.…”

Section: Introductionmentioning

confidence: 99%

“…[16,18] concluded that "Smart Glass" film (commercially available window film ULR-80 that blocks UV and higher light wavelengths which are not used for plant growth but contribute to heat generation) applied to the roof and walls of a greenhouse increase energy and resource use efficiency, without affecting fruit quality. The energy saving was accompanied by certain levels of yield reduction in both eggplant and capsicum crops [16,18]. However, there is still a lack of research investigation on energy analysis in protected cropping from adjustable ventilation and energy-efficient design perspectives.…”

Section: Introductionmentioning

confidence: 99%

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Energy Minimisation in a Protected Cropping Facility Using Multi-Temperature Acquisition Points and Control of Ventilation Settings

et al. 2021

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Energy management in protected cropping is critical due to the high cost of energy use in high-tech greenhouse facilities. The main purpose of this research was to investigate the optimal strategy to reduce cooling energy consumption, by regulating the settings (opening/closing) of either vents or curtains during the day, at the protected cropping facility at Western Sydney University. We measured daily changes in air temperature and energy consumption under four treatments (open/closed combinations of vents and shade screens) and developed an optimal cooling strategy for energy management using multi-temperature acquisition points at different heights within a greenhouse compartment. The optimal treatment (vents open/curtains closed) reduced energy load at the rooftop, thereby maintaining a desirable plant canopy temperature profile, and reducing cooling energy. Daily energy consumption was lowest for vents open/curtains closed (70.5 kWh) and highest for vents closed/curtains open (121 kWh). It was also found that delaying the operation of opening and closing of vents and curtains until the plant canopy temperature reached 25 °C reduced cooling energy consumption and decreased heating energy consumption in the morning (e.g., 08:00 to 10:00). The estimated savings of 1.83 kWh per 1 °C cooling between the optimal (vents open/curtains closed) and least optimal (vents closed/curtains open) conditions had the potential for significant energy savings at 494 kWh per °C over a crop cycle of nine months in warm weather conditions. However, selection of the optimal cooling strategy utilising control of vents and curtains must also account for the impact from other greenhouse environmental factors, including light, humidity, and CO2 concentration, which may be crop specific.

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Section: Greenhouse Hardware and Softwarementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy Minimisation in a Protected Cropping Facility Using Multi-Temperature Acquisition Points and Control of Ventilation Settings

et al. 2021

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“…During both cool and warm climate conditions, SGF coated onto HD1AR diffuse glass helped to reduce cooling energy and fertigation demand of an eggplant crop grown in a glasshouse yet did not significantly affect ventilation or heating energy use [ 12 ]. SGF blocked 85% of ultraviolet, 58% of far-red, and 26% of red light, causing a 19% reduction in photosynthetically active radiation (PAR) and 25% reduction in eggplant fruit yield [ 13 ]. The reduction in yield could be attributed to reduced photosynthesis and a lower xanthophyll de-epoxidation state (DPS) which affected nonphotochemical quenching and the optimum response to oscillating changes in the light environment [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Smart Glass Film Reduced Ascorbic Acid in Red and Orange Capsicum Fruit Cultivars without Impacting Shelf Life

Chavan

Hamoui

et al. 2022

Plants

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Smart Glass Film (SGF) is a glasshouse covering material designed to permit 80% transmission of photosynthetically active light and block heat-generating solar energy. SGF can reduce crop water and nutrient consumption and improve glasshouse energy use efficiency yet can reduce crop yield. The effect of SGF on the postharvest shelf life of fruits remains unknown. Two capsicum varieties, Red (Gina) and Orange (O06614), were cultivated within a glasshouse covered in SGF to assess fruit quality and shelf life during the winter season. SGF reduced cuticle thickness in the Red cultivar (5%) and decreased ascorbic acid in both cultivars (9–14%) without altering the overall morphology of the mature fruits. The ratio of total soluble solids (TSSs) to titratable acidity (TA) was significantly higher in Red (29%) and Orange (89%) cultivars grown under SGF. The Red fruits had a thicker cuticle that reduced water loss and extended shelf life when compared to the Orange fruits, yet neither water loss nor firmness were impacted by SGF. Reducing the storage temperature to 2 °C and increasing relative humidity to 90% extended the shelf life in both cultivars without evidence of chilling injury. In summary, SGF had minimal impact on fruit development and postharvest traits and did not compromise the shelf life of mature fruits. SGF provides a promising technology to block heat-generating solar radiation energy without affecting fruit ripening and marketable quality of capsicum fruits grown during the winter season.

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“…The application of PV cell not only provided electricity but also reduced the water requirement in the greenhouse due to the specified transmission of the spectrum. Chavan et al [ 48 ] used smart glass in a greenhouse that can block a major portion of UV, some portion of far‐red and red light. The smart glass was capable to reduce the energy requirement of the greenhouse, but the crop yield also decreased by about 25%.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Spectrum Selective Nanofluid‐Based Cooling for a Self‐Sustaining Greenhouse

Sajid

Biçer

2020

Energy Tech

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In hot climatic conditions, the temperature inside a greenhouse is much higher than the ambient temperature and requires significant cooling to maintain the temperature in the optimal range. This study proposes a novel concept for a selfsustaining greenhouse, which integrates evacuated tube collectors, a multistage flash desalination system, vapor absorption cooling system, and photovoltaic thermal (PV/T) system to produce freshwater, cooling, and electricity. The PV/T system uses spectrum selective nanofluid that is circulated over the roof of the greenhouse and absorbs solar radiation having wavelengths greater than 1400 nm to reduce cooling load inside the greenhouse and optimize the spectrum use. The performance of the proposed system is evaluated using energy and exergy analysis. The energy efficiencies of the evacuated tube collector, desalination unit, and PV/T system are obtained as 45.85%, 46.16%, and 51.25%, respectively. The absorption cooling system achieves an energetic coefficient of performance of 0.83. The overall energy and exergy efficiencies of the proposed system are found to be 30% and 5.88%, respectively. The application of spectrum selective nanofluid on the roof of the greenhouse yields about 26% reduction in the cooling load of the greenhouse.

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Light‐limited photosynthesis under energy‐saving film decreases eggplant yield

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 34 publications

References 67 publications

Energy Minimisation in a Protected Cropping Facility Using Multi-Temperature Acquisition Points and Control of Ventilation Settings

Energy Minimisation in a Protected Cropping Facility Using Multi-Temperature Acquisition Points and Control of Ventilation Settings

Smart Glass Film Reduced Ascorbic Acid in Red and Orange Capsicum Fruit Cultivars without Impacting Shelf Life

Performance Assessment of Spectrum Selective Nanofluid‐Based Cooling for a Self‐Sustaining Greenhouse

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