Abstract
Theoretical studies of the thermal state of heat storage elements with air channels of various shapes in the modes of charging and heat output of the electric thermal storage (ETS) are carried out. The mathematical model of heat exchange processes adapted to the operating modes of the ETS is presented. The change in the average heat transfer coefficient in the air channels in the conditions of natural and forced convection in the modes of charging and heat output ETS, and the heat flux density in the mode of charging of the ETS from a tubular electric heating element (TEH) for heat storage elements with channels of a slit and round shape are shown. The temperature distribution in heat storage elements made of chamotte and magnesite with slit-shaped (standard design) and round shape channels is obtained. As a result of the studies carried out, the temperature change and the dynamics of heat transfer in the air channels of heat storage elements made of various types of thermal storage material (TSM) in the modes of charging and heat output of the ETS were analyzed. The conclusion is made about the efficiency of using heat storage elements made of chamotte with round-shaped channels in the ETS.
Highlights
The main sources of heat supply for rural areas are usually small boiler houses, as well as individual heat generators using various types of organic fuel
The mass introduction of electric thermal storage (ETS) in rural areas and farms will not require the introduction of additional power generating capacities, will reduce the consumption of organic fuel at thermal power plants (TPPs) and combined thermal and power plants (CTPPs) by replacing it with nuclear energy and reduce electricity losses in the power grid, and will eliminate the need in maneuvering the capacities of power plants of TPPs and CTPPs at night, which leads to a decrease in their efficiency and excessive consumption of fuel
As a result of numerical simulation of thermal processes, the temperature distribution in the heat storage element made of chamotte with round-shaped channels in the modes of charging and heat output of the ETS was obtained (Fig. 5)
Summary
The main sources of heat supply for rural areas are usually small boiler houses, as well as individual heat generators using various types of organic fuel In most cases, these heatgenerating installations have quite low efficiency, the actual value of which is less than that stated in the boiler's passport data. This is often due to the use of local types of low-grade and substandard fuel (coal, peat, wood), unsatisfactory technical condition, and the conditions and modes of operation of boilers The use of such heat-generating installations will certainly entail a significant excessive consumption of fuel [1, 2]. The mass introduction of ETS in rural areas and farms will not require the introduction of additional power generating capacities, will reduce the consumption of organic fuel at TPPs and combined thermal and power plants (CTPPs) (gas, coal) by replacing it with nuclear energy and reduce electricity losses in the power grid, and will eliminate the need in maneuvering the capacities of power plants of TPPs and CTPPs at night, which leads to a decrease in their efficiency and excessive consumption of fuel
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