Numerical Simulation of Thermal Energy Storage in Underground Soil Heat Accumulator

Kortiš, Ján; Gottwald, Michal

doi:10.2478/cee-2014-0017

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…Слід відзначити, що частина енергії у випадку геоакумуляторів розсіюється у гірський масив, що суттєво знижує показники енергоефективності. Альтернативою даної технології є акумуляція холоду в системах кондиціонування будівель з використанням відновлюваного сезонного акумулятора холоду з фазовим перетворенням, що є одним із шляхів зменшення споживання енергії та економічно вигідним інженерним рішенням [2][3][4][5].…”

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Development and Determination of Parameters of Seasonal Cold Accumulators With Phase Transformation

Derevianko,

Zaichenko,

Jukova

et al. 2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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The purpose of this study is to develop and justify the parameters of new structures of seasonal batteries with phase transformation of the storage material, which allow to get rid of deformations and destruction of the contacting elements of the battery structure when the aggregate state changes. The design of a seasonal battery with a phase transformation of the storage material is based on a shell that allows to compensate for the expansion of the material when the aggregate state changes. Determination of the dependence of the energy parameters on the geometric parameters and thermophysical parameters of the constituent elements of the seasonal battery with phase transformation, which allow the battery capacity and power at different stages of discharge and charge. The study of phase transition processes made it possible to establish the characteristic stages of charging and discharging the battery: heating the material to the phase transformation temperature; heat transfer for phase transformation 0°C; heating the material after the phase transformation; cooling the material to the phase transformation temperature; heat removal for phase transformation 0°C (in some cases hypothermia up to 3-4°C is possible; cooling of the material after the phase transformation. The largest battery power values occur at the stage of cooling the material to the temperature of the phase transformation and heating the material after the phase transformation (25.62 kW ). The lowest power of the battery (13.56 kW) is observed heating of the material to the temperature of the phase transformation and cooling of the material after the phase transformation, which is explained by the low heat exchange of the accumulating substance in the solid state. Based on the conducted research, recommendations were made that the prospects for the development and optimization of the design of seasonal batteries with the phase transformation of the accumulating material.

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Section: вступunclassified

Development and Determination of Parameters of Seasonal Cold Accumulators With Phase Transformation

Derevianko,

Zaichenko,

Jukova

et al. 2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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Parameters determination and development of seasonal cold accumulators with phase transformation

Zaichenko,

Opryshko,

Bielokha

et al. 2023

2023 IEEE 4th KhPI Week on Advanced Technology (KhPIWeek)

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The calculation of building cooling under emergency conditions to ensure their heating reliability

Samarin

2019

Vestnik MGSU

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Introduction. Continuation of research in the area of premise cooling rate calculation with the aim of obtaining dependencies, which are sufficiently accurate and take into account the most of the factors essential for the problem, but at the same time having an engineering form, is still relevant. The purpose of the study is the search for a dependence of the temperature in the building premises on time in the initial period after heat supply shutdown at emergency mode. Exponential nature of this dependence is considered as a scientific hypothesis. Materials and methods. The basic equations connecting the most important components of a heat flow in a cooling room under condition of the termination of heat supply from heating devices are used and analysed in the study. A numerical model of non-stationary thermal regime of the ventilated room is implemented on the base of the solution of a differential equations system of heat conduction and heat transfer on the surfaces of the room. Results. An analytical expression is obtained for the room cooling rate when the heat supply is disconnected, which has the form of an exponential function of square root of time since the accident. The cooling time before the condensation on the inner surface of the enclosure is determined by the example of a currently existing residential building under climatic conditions of Moscow, accounting the structural characteristics of the building and normalized fresh-air flow rate. Conclusions. It is shown that the building cooling in the initial period is influenced mainly by the ratio of the heat flux associated with unorganized air exchange and the heat loss to the environment through “light” enclosure. It was found that the decrease of natural air exchange in the building cooling process leads to a certain slowdown in the decrease of temperature, but it is not decisive. It is understood that the use of airtight light opening fillers, for example, in plastic casement, under normal conditions aggravating the sanitary and hygienic situation in the premises, under emergency conditions increases the available time interval for the restoration of heat supply.

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Numerical Simulation of Thermal Energy Storage in Underground Soil Heat Accumulator

Cited by 3 publications

References 3 publications

Development and Determination of Parameters of Seasonal Cold Accumulators With Phase Transformation

Development and Determination of Parameters of Seasonal Cold Accumulators With Phase Transformation

Parameters determination and development of seasonal cold accumulators with phase transformation

The calculation of building cooling under emergency conditions to ensure their heating reliability

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