Data sets on thermophysical characteristics of natural rocks for thermal energy storage
<p dir="ltr">Description of data<br>Data on thermophysical properties of natural rocks is important when selecting suitable solid state sensible thermal energy storage materials. In this study the following parameters were considered:<br>-Thermal stability of rock samples...
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| _version_ | 1849927635529891840 |
|---|---|
| author | Christopher Enweremadu (22645085) |
| author_facet | Christopher Enweremadu (22645085) |
| author_role | author |
| dc.creator.none.fl_str_mv | Christopher Enweremadu (22645085) |
| dc.date.none.fl_str_mv | 2025-11-25T07:19:25Z |
| dc.identifier.none.fl_str_mv | 10.25399/UnisaData.30704381.v1 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/dataset/Data_sets_on_thermophysical_characteristics_of_natural_rocks_for_thermal_energy_storage/30704381 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Natural resource management Thermophysical Natural rocks Thermal energy Thermal energy storage |
| dc.title.none.fl_str_mv | Data sets on thermophysical characteristics of natural rocks for thermal energy storage |
| dc.type.none.fl_str_mv | Dataset info:eu-repo/semantics/publishedVersion dataset |
| description | <p dir="ltr">Description of data<br>Data on thermophysical properties of natural rocks is important when selecting suitable solid state sensible thermal energy storage materials. In this study the following parameters were considered:<br>-Thermal stability of rock samples provides critical information on determining suitable temperature ranges within which, rocks are thermally stable to efficiently store and release heat. <br>-Specific heat capacity and Density of rocks are important on determining thermal storage capacity and energy density of the rock bed-thermal energy storage systems<br>-Thermal diffusivity are essential on thermal performance of thermal energy storage systems since it affects rate of thermal charging and discharging of TES systems.<br><br>Materials, methods and findings<br>Nine natural stones (basalt BA1 and BA2, dolerite DO1 and DO2, gabbro, granite, rhyolite, gneiss and quartzite) were mapped and collected. Measurement methods used and obtained results are summarised below:<br><br>Specific heat capacity<br>A differential scanning calorimetry apparatus was used for experimental determination of specific heat capacity of the natural rock samples. Rock samples in powdered form were heated from room temperature up to 300˚C. Recorded heat flow values during heating cycles were used to obtain values of specific heat capacity. Obtained data revealed that, specific heat capacity of studied natural rocks is significantly dependent on temperature of the measured sample. The data indicated that, values of specific heat capacity ranges from 767 to 861 J/kgK and between 942 and 1090 J/kgK at temperatures 25 ℃ and 250 ℃ respectively.<br><br>Thermal stability<br>Experimental measurements were done using Thermogravimetric analyser (TGA). Samples in powdered form were heated from room temperature to 700˚C while monitoring and measuring weight losses of the rock samples. TGA data has shown that, there are insignificant losses of weight for all the rock samples, within the temperature range. All the rock samples exhibited percentage weight losses which are less than 5% and these observed results indicate that all studied samples are thermally stable to be used for heat storage in this temperature range.<br><br>Density<br>Mass and volume of the rock samples in their natural form were measured and used to calculate the bulk wet density of the rock samples. The obtained values ranged from 2.500 to 3.001 g/cm3 with, basalt, gabbro and dolerite samples showing the highest values as compared to other samples.<br><br>Thermal diffusivity<br>Data on thermal diffusivity was generated from numerical calculations using measured values of density and specific heat capacity and literature data for thermal conductivity. The results show that diffusivity of all rock samples generally decreases as the temperature increases and this implies that, thermal efficiency of rocks reduces when charging or discharging them at higher operating temperatures.</p> |
| eu_rights_str_mv | openAccess |
| id | Manara_7e058ad770d9f0c650e75222f712ec4d |
| identifier_str_mv | 10.25399/UnisaData.30704381.v1 |
| network_acronym_str | Manara |
| network_name_str | ManaraRepo |
| oai_identifier_str | oai:figshare.com:article/30704381 |
| publishDate | 2025 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | Data sets on thermophysical characteristics of natural rocks for thermal energy storageChristopher Enweremadu (22645085)Natural resource managementThermophysicalNatural rocksThermal energyThermal energy storage<p dir="ltr">Description of data<br>Data on thermophysical properties of natural rocks is important when selecting suitable solid state sensible thermal energy storage materials. In this study the following parameters were considered:<br>-Thermal stability of rock samples provides critical information on determining suitable temperature ranges within which, rocks are thermally stable to efficiently store and release heat. <br>-Specific heat capacity and Density of rocks are important on determining thermal storage capacity and energy density of the rock bed-thermal energy storage systems<br>-Thermal diffusivity are essential on thermal performance of thermal energy storage systems since it affects rate of thermal charging and discharging of TES systems.<br><br>Materials, methods and findings<br>Nine natural stones (basalt BA1 and BA2, dolerite DO1 and DO2, gabbro, granite, rhyolite, gneiss and quartzite) were mapped and collected. Measurement methods used and obtained results are summarised below:<br><br>Specific heat capacity<br>A differential scanning calorimetry apparatus was used for experimental determination of specific heat capacity of the natural rock samples. Rock samples in powdered form were heated from room temperature up to 300˚C. Recorded heat flow values during heating cycles were used to obtain values of specific heat capacity. Obtained data revealed that, specific heat capacity of studied natural rocks is significantly dependent on temperature of the measured sample. The data indicated that, values of specific heat capacity ranges from 767 to 861 J/kgK and between 942 and 1090 J/kgK at temperatures 25 ℃ and 250 ℃ respectively.<br><br>Thermal stability<br>Experimental measurements were done using Thermogravimetric analyser (TGA). Samples in powdered form were heated from room temperature to 700˚C while monitoring and measuring weight losses of the rock samples. TGA data has shown that, there are insignificant losses of weight for all the rock samples, within the temperature range. All the rock samples exhibited percentage weight losses which are less than 5% and these observed results indicate that all studied samples are thermally stable to be used for heat storage in this temperature range.<br><br>Density<br>Mass and volume of the rock samples in their natural form were measured and used to calculate the bulk wet density of the rock samples. The obtained values ranged from 2.500 to 3.001 g/cm3 with, basalt, gabbro and dolerite samples showing the highest values as compared to other samples.<br><br>Thermal diffusivity<br>Data on thermal diffusivity was generated from numerical calculations using measured values of density and specific heat capacity and literature data for thermal conductivity. The results show that diffusivity of all rock samples generally decreases as the temperature increases and this implies that, thermal efficiency of rocks reduces when charging or discharging them at higher operating temperatures.</p>2025-11-25T07:19:25ZDatasetinfo:eu-repo/semantics/publishedVersiondataset10.25399/UnisaData.30704381.v1https://figshare.com/articles/dataset/Data_sets_on_thermophysical_characteristics_of_natural_rocks_for_thermal_energy_storage/30704381CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/307043812025-11-25T07:19:25Z |
| spellingShingle | Data sets on thermophysical characteristics of natural rocks for thermal energy storage Christopher Enweremadu (22645085) Natural resource management Thermophysical Natural rocks Thermal energy Thermal energy storage |
| status_str | publishedVersion |
| title | Data sets on thermophysical characteristics of natural rocks for thermal energy storage |
| title_full | Data sets on thermophysical characteristics of natural rocks for thermal energy storage |
| title_fullStr | Data sets on thermophysical characteristics of natural rocks for thermal energy storage |
| title_full_unstemmed | Data sets on thermophysical characteristics of natural rocks for thermal energy storage |
| title_short | Data sets on thermophysical characteristics of natural rocks for thermal energy storage |
| title_sort | Data sets on thermophysical characteristics of natural rocks for thermal energy storage |
| topic | Natural resource management Thermophysical Natural rocks Thermal energy Thermal energy storage |