Abstract
Abstract The paper discusses a method of the multilayered heat storage wall. Initial data: walls are multilayered, heat conductivity process is considered being one-dimensional, climatic factors and power supplied are periodic functions of time. In the paper mathematical and numerical models are presented. A mathematical model is constituted of a system of differential equations which describe heat conduction in material layers, equation of heat balance and boundary conditions system. Solving equations with regard to unknown property which has been recognized as a crucial parameter in the task one can obtain a real numeric value of the parameter. The paper is illustrated by the nomograms of calculated accumulating layer thickness and the scheme of an algorithm designed to calculate the thickness of accumulating layer.
Highlights
Thermal energy storage (TES) is very important in many engineering applications
The paper investigates the use of electrically heated heat storage wall (HSW) in order to reduce the heating cost, while retaining heat comfort in the room. lt aims at presenting a method of dimensioning the multilayered HSW
As far as practical applications are concerned, the proposed nomograms constitute the full specification of data- for selecting electrically heated heat storage wall in a given group of design systems
Summary
Thermal energy storage (TES) is very important in many engineering applications. For example, among the practical problems involved in solar energy systems is the need for an effective means by which the excess heat collected during periods of bright sunshine can be stored, preserved and later released for utilization during the night or other periods [1, 2]. Electrical consumption varies greatly during the day and the night Such variation leads to differences in the electricity price during the off-peak period (usually from evening to morning), when it is reduced to approximately one-third or even one-fourth. A variation of TES is used to shift energy loads to offpeak periods in order to reduce utility charges and minimise or avoid high, on-peak demand charges [3, 4]. The paper investigates the use of electrically heated heat storage wall (HSW) in order to reduce the heating cost, while retaining heat comfort in the room. To properly handle the problem, there is a need to solve the thern1al model of the building incorporating a quasistationary, electrically heated HSW (as an element of the room enclosure). With reference to the room, the inverse internal problem of the first kind leading to the determination of thermophysical properties of the heat storage wall has been fonnulated
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