Numerical simulation of the thermal state and selecting the shape of air channels in heat-storage cells of electric-thermal storage

Khimenko, A V; Tikhomirov, Dmitry; Vasilyev, Alexey N.; Samarin, Gennady; Shepovalova, Olga V.

doi:10.1016/j.egyr.2022.08.216

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…Previous works of the authors were also devoted to modeling the thermal state of the heat storage elements of the electric thermal storage (ETS) [9] and calculating the thermal characteristics of the ETS [10]. The results of experimental studies of the thermal state of heat storage elements in the heat charging and heat emission operation modes of ETS are presented [11].…”

Section: Methodsmentioning

confidence: 99%

Power supply installation for remote rural settlements with solar thermoelectric generator

et al. 2023

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An analysis of scientific studies has been carried out, which presents thermoelectric technologies based on solar energy that can satisfy not only the need for electricity generation, but also contribute to energy saving and environmental protection. The results of theoretical and experimental studies on the development of power supply systems based on thermoelectric generators in combination with photovoltaic panels, solar concentrators and heat pipes are also presented, allowing us to conclude that the creation of solar thermoelectric generators is relevant. The authors have developed a design and presented a description of the power supply installation operation with a solar thermoelectric generator and heat pipes transmitting thermal energy from a solar concentrator through a solid-state thermal storage to a thermoelectric generator. Expressions are given for calculating the main thermal characteristics of the elements of the proposed installation with a solar thermoelectric generator (solar concentrator and solid-state thermal storage), as well as the efficiency factor and output electric power of the thermoelectric generator.

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Section: Methodsmentioning

confidence: 99%

Power supply installation for remote rural settlements with solar thermoelectric generator

et al. 2023

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“…The total energy consumed for heating the air delivered to the air curtain and that for accelerating it to the required air jet velocity, in the output from the air curtain, equals to E0 = Efan + Q0 (see Figure 11). While calculating the temperature of air supplied to the air curtain t0, with the use of formula (14), and the average air temperature of the air jet portion ejected into the premises from the air curtain tmix, with the use of formula (16), it is advisable to select the average value of the temperature corresponding to the coldest month of the year (January), in accordance with SP 131.13330.2020 building climatology, as that of the design winter temperature tout. For regions under consideration, this temperature value is in the range from −13 °С to −10 °С.…”

Section: Calculating the Parameters Of The Modular Air Curtainmentioning

confidence: 99%

“…While calculating the temperature of air supplied to the air curtain t 0 , with the use of formula (14), and the average air temperature of the air jet portion ejected into the premises from the air curtain t mix , with the use of formula (16), it is advisable to select the average value of the temperature corresponding to the coldest month of the year (January), in accordance with SP 131.13330.2020 building climatology, as that of the design winter temperature t out . For regions under consideration, this temperature value is in the range from −13 • C to −10 • C. The selection of the average temperature value of the coldest fiveday period (−33 • C to −29 • C) with the probability 0.92 as the design winter temperature value t out would result in a two to three times growth of the heater capacity.…”

Section: Calculating the Parameters Of The Modular Air Curtainmentioning

confidence: 99%

“…In order to provide standard microclimate parameters for cattle management premises, an integrated energy-saving heat supply system was designed comprising electric thermal storage (ETS) units and a ceiling fan [15]. The results of the simulations and experimental studies of the heat storage cells and the thermal state of the newly-developed ETS unit in operation modes of charging and heat emission of ETS unit were reported [16,17]. An energy-saving air heating system was developed, featuring thermal energy recuperation of the exhaust air as well as ozonizing and deep recirculation [18].…”

Section: Introductionmentioning

confidence: 99%

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Study of Potential Application Air Curtains in Livestock Premises at Cattle Management Farms

et al. 2023

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Recommendations on the selection of air curtains and the calculation of their parameters for livestock premises in cattle management farms are made. The air curtain functioning principle is analyzed from the air jet theory point of view. The block diagram and modular design of air curtains with a variable air jet direction vector and with controlled slit width are designed. Laboratory tests of the newly designed air curtain structure are performed in accordance with the microclimate requirements for the cattle management farm premises. Based on the experimental results, the major air curtain parameters are calculated for the range from 10° to 60° of angle α between the direction of the air jet outward from the air curtain slit and aperture plane, and for the air curtain slit width b0 in the range from 0.05 m to 0.15 m with the account of the wind speed Vw variations. Calculated values for amounts of energy that have to be consumed to ensure the required air jet velocity, in the output from the air curtain, and those for the quantity of thermal energy required to heat the air supplied to the air curtain, depending on the angle α and on the slit width b0, can be helpful for selecting the power capacity of both the air curtain fan and electric heater. A block diagram of the air curtain control for cattle management farm premises is designed, enabling automatic control of the airflow rate, the angle of the air jet output from the air curtain slit, and the temperature of the heated air supplied to the air curtain, considering particular climate conditions. According to the preliminary estimate, applications of the newly designed air curtain will make it possible to reduce the energy consumed to maintain the required microclimate conditions in cattle management premises by 10% to 15% in the cold period.

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“…However, its solver has some advantages (for example, it offers fully coupled fluid-structure interaction analysis [15]). For example, in [16] ADINA software was used to analyse the heat exchange process adopted for the electric-thermal storage process in charging and heat emission. The authors of [17] used the ADINA CFD module to study the vibration of the valve installed in the piston.…”

Section: Introductionmentioning

confidence: 99%

Development of FEM Calculation Methods to Analyse Subcooled Boiling Heat Transfer in Minichannels Based on Experimental Results

2022

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Even though two-phase heat transfer of refrigerants in minichannel heat sinks has been studied extensively, there is still a demand for improvements in overall thermal performance of miniature heat transfer exchangers. Experimental investigation and sophisticated heat transfer calculations with respect to heat transfer devices are still needed. In this work, a time-dependent experimental study of subcooled boiling was carried out for FC-72 flow in a heat sink, comprising of five asymmetrically heated minichannels. The heater surface temperature was continuously monitored by an infrared camera. The boiling heat transfer characteristics were investigated and the effect of the mass flow rate on the heat transfer coefficient was studied. In order to solve the heat transfer problem related to time-dependent flow boiling, two numerical methods, based on the FEM were applied, and based on the Trefftz functions (FEMT) and using the ADINA program. The results achieved with these two calculation methods were explored with an emphasis on the impact of the mass flow rate (range from 5 to 55 kg/h) on the resulting heat transfer coefficient. It was found that, with increasing mass flow, the heat transfer coefficient increased. Good agreement was found between the heat transfer coefficients, determined according to two numerical methods and the simple 1D calculation method.

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Numerical simulation of the thermal state and selecting the shape of air channels in heat-storage cells of electric-thermal storage

Cited by 6 publications

References 26 publications

Power supply installation for remote rural settlements with solar thermoelectric generator

Power supply installation for remote rural settlements with solar thermoelectric generator

Study of Potential Application Air Curtains in Livestock Premises at Cattle Management Farms

Development of FEM Calculation Methods to Analyse Subcooled Boiling Heat Transfer in Minichannels Based on Experimental Results

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