Stratified TES Tank Configurations

Stratified TES Tank ConfigurationsName : Rangrej Somnath PrakashReg. No. : 140954002Programme Name: ATPES 2014-2016

1Outline of PresentationTerminologyThermal StratificationDesign considerationsTank configurationsCase StudyConclusionReferencesTerminologySensible HeatThermal StratificationCharging: Storing cooling capacity by removing heat from a cool storage device, or storing heating capacity by adding heat to a heat storage device.Discharging: Using stored cooling capacity by adding thermal energy to a cool storage device or removing thermal energy from a heat storage device. Thermocline: Thermal layer of water in a chilled-water thermal storage tank, separating warmer water at the top and cooler water at the bottom.

Thermal Stratification in Liquid Storage Tanks

(dT/dx)b < (dT/dx)a

Stratified TES Tank configurations

Thermal behavior and stratification of hot water storage tanks during the stagnation mode is investigated experimentally, in this study for three different aspect ratios (AR) of the tank, namely 2, 1 and .

Case Study

CONCLUSIONS

The above points indicate that the heat loss to the ambient is a major factor in degradation of the thermal stratification in an un-insulated tankThe stratification was found to decrease continuously during the cooling periodA better thermal stratification is achieved by increasing the aspect ratio. The concept of thermal stratification can be used in heating as well as cooling (e.g. Air Conditioning)

References[1] Thermal Energy Storage systems and applications by Ibrahim Dincer[2] C. Cristofari, G. Notton, P. Poggi, A. Louche, Influence of the flow rate and the tank stratification degree on the performances of a solar flat-plate collector, Int. J. Thermal Sci. 42 (2003) 455-469.[3] U. Jordan, S. Furbo, Thermal stratification in small solar domestic storage tanks caused by drawoffs,Sol. Energy 78 (2005) 291-300.[4] L.J. Shah, S. Furbo, Entrance effects in solar storage tanks, Sol. Energy 75 (2003) 337-348.THANKYOU