Performance assessment of a novel combined heating mode integrated greenhouse and closed drying system with a dual-temperature steam jet heat pump

Xi, Xiuzhi; Duan, Dingli; Xu, Xiang; Liu, Feng; Zhang, Bo

doi:10.1016/j.seta.2022.102470

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…The choice of artificial heating methods for buildings and structures is only part of the energy conservation solution [9,13,[17][18][19][20][21][22]. In conjunction with this, there is a need for optimal architectural and planning solutions [15,[23][24][25][26][27][28], and the implementation of modern innovative technologies aimed at reducing the consumption of non-renewable fuel and energy resources [24,[29][30][31][32][33]. Therefore, within the context of addressing this problem, research on the impact of various factors on the energy balance of cultivation structures is required, consequently affecting the thermal regime of the premises and the calculated power of the adopted heating system.…”

Section: Introductionmentioning

confidence: 99%

Parametric Analysis of a Radiant Gas Heating System for Controlled-Environment Agriculture with Preheated Ventilation

Karpov,

Vafaeva,

Pavlov

et al. 2024

E3S Web Conf.

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This article explores the fundamental principles of the software method for calculating the gas-fired heating system of a cultivation structure, where the main source of heat is provided by ceiling-mounted gas infrared radiators. To maintain the required thermal regime within the premises, a gas air heater is utilized, designed to preheat the outdoor air to the necessary temperature before supplying it to the heated space.The calculation method is based on solving a system of interconnected equations of thermal and material balances for the cultivation structure, its enclosure, and the soil surface. Possible utilization of thermal energy from high-potential combustion products of gaseous fuel is taken into account.Using the example of the “Farmer 7.5” industrial greenhouse (Russian Federation), designed for year-round cultivation of plants in closed soil (in this case, cucumbers were the subject of study until the fruitbearing stage in the winter-spring cycle), the impacts of various factors are investigated: outside air temperature, thermal resistance of the enclosing structure on the heating system’s thermal power (in combination with the gas air heater), and variable parameters of the microclimate. The latter includes the enclosure temperature of the industrial greenhouse and the intake air temperature for general exchange ventilation needs. Specific conclusions and prospects for further scientific research are drawn based on the obtained results.

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Section: Introductionmentioning

confidence: 99%

Parametric Analysis of a Radiant Gas Heating System for Controlled-Environment Agriculture with Preheated Ventilation

Karpov,

Vafaeva,

Pavlov

et al. 2024

E3S Web Conf.

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show abstract

“…In addition to the mentioned traditional heating systems, alternative methods for providing thermal comfort to cultivation structures are organized, such as through heat pumps [1,15] or solar collectors (solar greenhouses) [2,6,[10][11][12][13][14]. Currently, for several reasons [3]: artificial source of infrared radiation; the absence of the need for a boiler installation, thermal networks, and related engineering equipment; automation of the technological process; even distribution of thermal energy on the soil surface; possible application of carbon dioxide (CO2) for plant fertilization, obtained from fuel combustion products when using gas infrared emitters -gas radiant heating systems are of significant interest in agriculture [16][17][18][19][20][21][22][23][24][25]. To predict, maintain, and control the thermal regime of cultivation structures, the ability to calculate all incoming and outgoing heat and mass flows from space is required.…”

Section: Introductionmentioning

confidence: 99%

Impact of Environmental Factors on Indoor Air Temperature in Gas-Fired Radiant Heated Cultivated Structures

Pavlov,

Vafaeva,

Karpov

et al. 2024

E3S Web Conf.

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Ensuring the required microclimate parameters of a cultivation structure, including indoor air temperature, relative humidity, and soil surface temperature, plays a crucial role in obtaining a rich harvest of vegetables and fruits in the winter season. Creating favourable conditions for growing plants in the protected ground is possible only by using modern, high-tech heating systems that will compensate for heat energy losses and maintain a set temperature regime in the room. Gas-fired radiant heating is one such system. This heating method, using ceiling gas infrared emitters as heat sources, directs the required heat flux directly to the soil surface. At the same time, direct or indirect emissions of harmful substances into the environment are minimal, and due to the absence of heat losses during heat production and heat carrier transportation, this type of heating is effective from both energy-saving and economic points of view. The article investigates the influence of meteorological, aerodynamic, heat engineering, and other factors on the air temperature in a cultivation structure under gas-fired radiant heating conditions using a developed software calculation method. An analysis is performed, and explanations are given for the nature of the change in indoor air temperature depending on the changing environmental conditions—the example of the industrial greenhouse “Farmer 7.5” (Russian Federation).

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“…Previous research aiming to reduce energy consumption in greenhouse design and operations has been steadily progressing. In order to achieve this goal, various studies have been conducted, including studies on optimizing design for energy efficiency [1][2][3], maximizing ventilation efficiency [4][5][6], reducing lighting energy consumption [7][8][9], and applying high-performance systems [10][11][12]. In addition to these technological advancements, the introduction of renewable energy sources is essential for further reducing energy consumption in greenhouses and ultimately achieving net-zero energy use.…”

Section: Introductionmentioning

confidence: 99%

Economic Feasibility Analysis of Greenhouse–Fuel Cell Convergence Systems

Lee,

Shin,

Park

et al. 2023

Sustainability

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This study investigated the economic feasibility of introducing a new energy system, the greenhouse–fuel cell convergence system (GFCS), to a greenhouse that consumes a lot of energy. The GFCS is a concept that uses the heat generated during the power generation process to cool and heat the greenhouse, uses the emitted CO2 as fertilizer inside the greenhouse, and sells the generated electricity. For economic evaluation, the annual energy consumption of the greenhouse was first calculated through simulation, and then the appropriate fuel cell capacity was determined. Next, a farmer-led business model and a utility-led business model were presented, and the economic feasibility of these models was evaluated for tomatoes and mangoes. The economic evaluation of the GFCS confirmed the economic feasibility by comparing it with a greenhouse equipped with a geothermal heat pump. The results of the economic evaluation revealed that the farmer-led model had a benefit–cost ratio (B/C) ranging from 0.62 to 0.65 even with government support for heat utilization facilities, which was lower than that of a typical greenhouse (1.03 to 1.06). On the other hand, the utility-led model showed high B/C ranging from 1.19 to 1.86. If the initial investment cost of the fuel cells is reduced and a government policy is appropriately supported, the GFCS can be economically applied to greenhouses.

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Performance assessment of a novel combined heating mode integrated greenhouse and closed drying system with a dual-temperature steam jet heat pump

Cited by 4 publications

References 30 publications

Parametric Analysis of a Radiant Gas Heating System for Controlled-Environment Agriculture with Preheated Ventilation

Parametric Analysis of a Radiant Gas Heating System for Controlled-Environment Agriculture with Preheated Ventilation

Impact of Environmental Factors on Indoor Air Temperature in Gas-Fired Radiant Heated Cultivated Structures

Economic Feasibility Analysis of Greenhouse–Fuel Cell Convergence Systems

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