Study of a mechanical ventilation system with heat recovery to control temperature in a monitored agricultural environment under Summer conditions

Perone, Claudio; Orsino, Michela; Fianza, Giovanna La; Giametta, Ferruccio; Catalano, Pasquale

doi:10.1016/j.jobe.2021.102745

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…Nevertheless, it is interesting to observe that lettuce grown under the operation of fogging, shading, and ventilation fan (T4) tended to exhibit a higher yield than that under the operation of fogging and shading. These results are consistent with those of Perone et al [51], who suggested that the right balance of air circulation can improve optimal gas and water diffusion in the leaf boundary layer, which enhances plant transpiration and photosynthesis and, as a result, fosters plant growth and development. In addition to the current investigation, even under the control treatment (no temperature control systems), the marketable fresh weight of lettuce seems to be higher in some harvesting periods.…”

Section: Discussionsupporting

confidence: 93%

Comparison of Different Temperature Control Systems in Tropical-Adapted Greenhouses for Green Romaine Lettuce Production

Kumsong,

Thepsilvisut,

Imorachorn

et al. 2023

Horticulturae

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The cultivation of lettuce in greenhouses is negatively impacted by high temperatures, especially in hot climates. Therefore, developing an efficient method to regulate the internal temperature of greenhouses is essential to sustain crop productivity throughout the year. This study intends to investigate differential temperature control systems for green romaine lettuce production in the greenhouse. The experiment was conducted in a completely randomized design (CRD) with five replications. The four treatments consisted of (1) control, (2) Fogging + ventilation fan, (3) Fogging + shading, and (4) Fogging + ventilation fan + shading. The different temperature control systems influenced the growth and yield parameters, in which shading operation appears to cause reductions in photosynthetic rate, leading to declines of marketable fresh weight. However, the operation of the fogging and ventilation fan was considered the appropriate method for improving indoor air temperature since this resulted in higher growth and yield and a greater sensory evaluation. Maintaining VPD values between 1.62 and 1.76 kPa and controlling light intensity within the 530–700 mol m−2 s−1 range were recommended to ensure a consistent lettuce yield of 65–82 g plant−1 throughout the year.

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Section: Discussionsupporting

confidence: 93%

Comparison of Different Temperature Control Systems in Tropical-Adapted Greenhouses for Green Romaine Lettuce Production

Kumsong,

Thepsilvisut,

Imorachorn

et al. 2023

Horticulturae

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“…Although the reference design (NG boiler and natural ventilation) still has a lower initial cost by a large margin, the integrated systems showed superior performance over the reference design in terms of operating cost with the given energy tariffs. However, the operating cost benefit of a larger AHU unit, particularly for those scenarios associated with HENs designed for typical summer days (HEN7, 10,11,12), was diminished by the elevated fan energy consumption. In the case of the best design (HEN5), the integrated forced-ventilation contribution was found to be only 17% of the total ventilation requirement.…”

Section: Discussionmentioning

confidence: 99%

“…It was concluded that the integration of an AHX always reduces the annual energy consumption of the heating, cooling, and air conditioning (HVAC) system. Perone et al [11] introduced and optimized the heating performance of a prototype forced ventilation system using a combination AHX/heat pump for a greenhouse. The results showed superior performance of the system in terms of energy efficiency and temperature control in the greenhouse.…”

Section: Introductionmentioning

confidence: 99%

A Systematic Heat Recovery Approach for Designing Integrated Heating, Cooling, and Ventilation Systems for Greenhouses

2023

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Ventilation heat loss is one of the most important factors contributing to energy performance of greenhouses. This paper suggests a systematic method based on dynamic pinch analysis (PA) to design an integrated heating, cooling, and ventilation system that uses ventilation waste heat in a cost-effective and energy efficient way. A heat recovery system including an air handling unit, borehole thermal storage, and a heat pump is proposed to investigate all heat integration scenarios for an entire year. In the first step, the heat integration scenarios are reduced to a few typical days using a clustering technique. Then, a generic methodology for designing a heat exchanger network (HEN) for a dynamic system, ensuring both direct and indirect heat recovery, is presented and a set of HENs are designed according to the conditions of typical days. Afterwards, the best HEN design is selected among all design alternatives using a techno-economic analysis. The whole procedure is applied to a commercial greenhouse and the best HEN configuration and required equipment sizes are calculated. It is shown that the best-performing design for the greenhouse under study produces primary energy savings of 57%, resulting in the shortest payback period of 9.5 years among all design alternatives.

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“…In general, cooler temperatures are preferred, but these plants can tolerate some level of heat stress. It is important to note that different cultivars of basil and lettuce may have differing temperature requirements, so it's essential to research the ideal conditions for the specific cultivar that are growing 32 , 33 . Optimal temperature during the day and night for lettuce and basil minimize temperature fluctuations, promote photosynthesis and plant growth during the day, and reduce respiration rates and plant stress at night.…”

Section: Introductionmentioning

confidence: 99%

Optimizing growth conditions in vertical farming: enhancing lettuce and basil cultivation through the application of the Taguchi method

Farhangi

Mozafari

Roosta

et al. 2023

Sci Rep

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This paper reports on the findings of an experimental study that investigated the impact of various environmental factors on the growth of lettuce and basil plants in vertical farms. The study employed the Taguchi method, a statistical design of experiments approach, to efficiently identify the optimal growth conditions for these crops in a hyper-controlled environment. By reducing the time and cost of designing and running experiments, this method allowed for the simultaneous investigation of multiple environmental factors that affect plant growth. A total of 27 treatments were selected using the Taguchi approach, and the signal to noise ratio was calculated to predict the optimal levels of each environmental condition for maximizing basil and lettuce growth parameters. The results showed that most of the parameters, except for EC and relative humidity for certain growth parameters, were interrelated with each other. To validate the results, confirmation tests were conducted based on the predicted optimal parameters. The low error ratio between expected and predicted values (1–3%) confirmed the effectiveness of the Taguchi approach for determining the optimal environmental conditions for plant growth in vertical farms.

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Study of a mechanical ventilation system with heat recovery to control temperature in a monitored agricultural environment under Summer conditions

Cited by 8 publications

References 34 publications

Comparison of Different Temperature Control Systems in Tropical-Adapted Greenhouses for Green Romaine Lettuce Production

Comparison of Different Temperature Control Systems in Tropical-Adapted Greenhouses for Green Romaine Lettuce Production

A Systematic Heat Recovery Approach for Designing Integrated Heating, Cooling, and Ventilation Systems for Greenhouses

Optimizing growth conditions in vertical farming: enhancing lettuce and basil cultivation through the application of the Taguchi method

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