scholarly journals CONSTRUCTION CALCULATION OF MOBILE HEAT STORAGE

2019 ◽  
Vol 41 (4) ◽  
pp. 35-43
Author(s):  
V.G. Demchenko ◽  
S.S. Gron ◽  
N.D. Pogorelova
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Heat Storage ◽  
Thermal Power ◽  
Operating Time ◽  
Design Parameters ◽  
Design Calculation ◽  
Storage Material ◽  
Source Power ◽  
Heat Storage Material

Modern thermal power is built based on three components: generation, transmission, and distribution of thermal energy. In this industry, another fourth element which was previously virtually absent is energy storage. Energy storage completely change our usual heat supply system. Heat storage is a serious factor in saving energy and improving environmental safety. The introduction of autonomous high and low potential heat storage systems is a real opportunity for the development of Intelligence Smart Grid heating systems. Therefore, the study of mobile heat storage batteries and the choice of methods for their design calculation and performance is an important task of modern science and technology. For this purpose, a study was conducted to determine the charging and discharge time of a mobile heat accumulator, depending on the type, volume, and temperature of the heat storage material. Types of thermal energy accumulation, classes of thermal accumulators, range of operating temperatures for a thermal accumulator were analyzed, design features of accumulators, operating time and methods of calculation of design parameters were considered. It is concluded that the method of calculation of MTA depends on the selected type of heat storage material. Although, phase transition materials have a higher heat storage density than liquid solutions, the design of liquid thermal batteries is much more attractive regarding technological, technical, and economic parameters. As a result of the study, the dependence of the MTA charging rate on the heat source power was obtained, the required amount of heat was determined, the average battery cooling time from the volume of the heat storage material, and the heat losses through the MTA body was analyzed. The results obtained must be taken into account when choosing the design and capacity of the battery.

scholarly journals Transient Behavior Analysis for Solar Energy Storage in PCM-CFM Material Using Equivalent Heat Capacity Method as Storage Model

2019 ◽  
Vol 14 (2) ◽  
pp. 40-57
Author(s):  
Talib K. Murtadha ◽  
Hussien M M. S Salih ◽  
Ali D. Salman
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Heat Storage ◽  
Experimental Results ◽  
Paraffin Wax ◽  
Storage Material ◽  
Copper Foam ◽  
Thermal Energy Storage Material ◽  
Flat Plate Collector

A paraffin wax and copper foam matrix were used as a thermal energy storage material in the double passes air solar chimney (SC) collector to get ventilation effect through daytime and after sunset. Air SC collector was installed in the south wall of an insulated test room and tested with different working angles (30o, 45o and 60o). Different SC types were used; single pass, double passes flat plate collector and double pass thermal energy storage box collector (TESB). A computational model based on the finite volume method for transient tw dimensional domains was carried out to describe the heat transfer and storage in the thermal energy storage material of collector. Also, equivalent specific heat method was employed to describe the heat storage and release in the mushy zone. Experimental results referred to an increase in thermal conductivity of paraffin wax that supported by copper foam matrix more than ten times. While the ventilation effect was still active for hours after the sun set, depending on the heat storage amount. Maximum ventilation mass flow rate with TESB collector was recorded with value equals to 36.651 kg/hr., when the overall discharge coefficient that was calculated for the system equals to 0.371. Experimental results showed that the best working angle range was 45~60o, and the highest air to the collector approaching temperature appeared to the double passes flat plate collector. Results gave greater heat storage efficiency of (47)% when the maximum solar radiation was 780 W/m2 at 12.00pm, while the energy summation through duration charge time was 18460 kJ. Computational results, depending on the equivalent heat capacity method for heat storage or release from phase change material that supported by copper foam matrix, showed the behavior of paraffin wax melting and solidification situation through periodic for charge and released heat from the solar collector. Also, these results gave agreement approaching the experimental results for the heat storage in the combined heat storage material, with standard error of 16.8%.

scholarly journals A Review on the Challenges of Using Zeolite 13X as Heat Storage Systems for the Residential Sector

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8062
Author(s):  
Amirhossein Banaei ◽  
Amir Zanj
Keyword(s):  
Thermal Energy ◽  
Heat Storage ◽  
State Of The Art ◽  
Storage Material ◽  
Residential Sector ◽  
Zeolite 13X ◽  
Point Of Interest ◽  
Current Review ◽  
Clear Vision ◽  
Heat Storage Material

In recent years, several attempts have been made to promote renewable energy in the residential sector to help reducing its CO2 emissions. Among existing approaches utilizing substances capable of directly storing and transporting thermal energy has recently become a point of interest. Zeolite 13X with exceptional capacity to safely store thermal energy for long periods and release heat due to its unique molecular structure is known to be one of the best options serving this purpose. However, the application of this ceramic as a heat storage material in the residential sector is associated with significant challenges dictated by the limitations of the sector, such as space restrictions and affordability. The current review attempts to explore the extent of these challenges, mainly related to design and efficiency from different perspectives. The main aim here is to provide a clear vision for a better understanding of the state of the art of this technology and to help to identify possible solutions fostering the adaptation of this technology to the residential sector.

scholarly journals Saline Cavern Adiabatic Compressed Air Energy Storage Using Sand as Heat Storage Material

2017 ◽  
Vol 5 (1) ◽  
pp. 32-45 ◽  
Author(s):  
Martin Haemmerle ◽  
Markus Haider ◽  
Reinhard Willinger ◽  
Karl Schwaiger ◽  
Roland Eisl ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Storage ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Storage Material ◽  
Heat Storage Material

scholarly journals EXPERIMENTAL RESEARCH OF THERMAL STABILITY OF SUBSTANCES FOR THERMAL ENERGY STORAGE

2019 ◽  
Vol 41 (2) ◽  
pp. 64-71
Author(s):  
V.G. Demchenko ◽  
V.Yu Falco
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Melting Point ◽  
Thermal Energy ◽  
Thermophysical Properties ◽  
Heat Storage ◽  
Waste Heat ◽  
Thermal Power ◽  
Stable Operation ◽  
Heating And Cooling

Optimizing the storage methods for excess heat energy and associated technical and technological solutions has a significant impact on the development of LHTES systems. New technologies for storing thermal energy are increasingly an alternative to the classic methods of providing thermal infrastructure facilities. In this paper we analyze the results of experimental studies of heat-storage materials for their further integration into the Smart Grid heating system of infrastructure objects and use in the M-TES. The conducted literary review showed that the thermophysical parameters of the investigated substances for the conservation of heat from different authors are very different. We conclude that this is due to the quality of the materials being studied and the errors of laboratory measurements. This negatively affects the design of LHTES systems and greatly complicates the calculation and modeling of heat transfer processes. It is especially important to correctly determine the amount of heat that can be obtained during the charging and discharge cycles of TES, as well as the lifetime of the material that accumulates heat. Therefore, the purpose of this work is to identify the appropriate material for energy storage applications between 0 0C and 115 0C and evaluate it, depending on the thermophysical properties and the time of stable operation. Taking into account the economic aspects, only the available technical materials are considered within the framework of this study, since the choice of material is aimed at the use of M-TES in real conditions of operation. Figure 1 summarizes the results of research on heating and cooling cycles of heats of heat storage substances. High thermal power and, hence, high thermal conductivity are important for the storage efficiency of PCM, especially in the process of solidification, because in a heat transfer predominant solid layer that grows continuously. However, both PCMs are not suitable for mobile thermal storage systems in this form. The huge disadvantages are the emergence of different values ​​of the melting point, the high retention time of both candidates, as well as their prices. Therefore, further research should be directed to eliminate these negative effects. Despite the relatively low density of heat storage with aqueous solutions of antifreeze, they are beneficial candidates for waste heat transfer systems within the framework of this study. Addition of NaCl salt practically does not affect the speed of heating and cooling of the coolant. The addition of bischofite worsens the thermophysical properties of water and shows a small density of heat accumulation. It has been experimentally established that after 3 ... 4 cycles of heating and cooling from a solution of technical bischofite, a dark yellow, insoluble precipitate forms, which creates problems during the operation. Significant increase in TES discharge time was obtained when testing ozokerite. All of the above substances have shown a stable state after 30 cycles of heating / cooling and indicate overcooling below the melting point by about 30 °C. Trihydrate sodium acetate shows no stable results. Subsequently, after 20 cycles of heating and cooling, it loses its properties.

Heat Recovery and Urban Mobile Heat Provider System for Industrial and Mining Enterprises

2012 ◽  
Vol 193-194 ◽  
pp. 198-205
Author(s):  
Pei Jiang ◽  
Nan Li ◽  
Yang Chao Sun
Keyword(s):  
Heat Recovery ◽  
Heat Storage ◽  
Thermal Power ◽  
Heat Energy ◽  
Storage Material ◽  
Heat Storage Material

Heat recovery and urban mobile heat provider system facilitate both users and thermal power factories at the same time. Plentiful of energy will be saved by it which is responding to the harmonious society's requirement. Redundant heat energy is used by heat storage material in vehicles, so economy and rapidity is the characteristic of the system

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