Experimental investigation of the LHS system and comparison of the stratification performance with the SHS system using CFD simulation

Ramana, A. S.; Venkatesh, R.; Raj, V. Antony Aroul; Velraj, R.

doi:10.1016/j.solener.2014.02.009

Cited by 33 publications

(10 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The same trend has been observed with respect to the variation of the “MIX” number for the other two mass flow rates. Ramana et al 8 reported similar results of enhancement in the stratification in the presence of PCM for the TES system coupled with flat plate collector validating the present results.…”

Section: Resultssupporting

confidence: 90%

“…Ramana et al 8 through their experimental and CFD simulations analyzed the stratification effects for sensible heat and PCM packed LHS systems, integrated to a solar collector. The higher stratification and quickened charging rate improved the efficiency of the collector when coupled with LHS systems, attaining maximum heat storage of 256.7 MJ, as opposed to 225.0 MJ in the sensible heat storage case.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal performance enhancement of compound parabolic concentrator solar collector using latent heat thermal energy storage

Natesamurthi

Kumaresan

Christopher

et al. 2021

Environ Prog Sustainable Energy

View full text Add to dashboard Cite

Employment of compound parabolic concentrator (CPC) solar collector with evacuated tubes enables effective collection of solar energy. The main objective of the present experimental work is to investigate thermal performance of CPC solar collector coupled with sensible and latent heat thermal energy storage (TES) system. Depending on obtained thermal stratification in sensible TES system, a commercial phase change material (PCM)—OM 65 has been selected and packed only at top quarter section of the TES system. Results showed an appreciable cumulative energy storage of 21 MJ d−1 due to existence of desired temperature driving potential during charging. A higher thermal stratification has been achieved in latent heat TES system, reducing the “MIX” number and supplying the heat transfer fluid at lower temperature to the collector. Due to enhanced useful heat energy gained, thermal efficiency of CPC collector reaches a maximum of 49% while coupling with latent heat TES system. The outcome of the study highlights the potential role of CPC and PCMs in solar thermal system, particularly for water heating applications.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Thermal performance enhancement of compound parabolic concentrator solar collector using latent heat thermal energy storage

Natesamurthi

Kumaresan

Christopher

et al. 2021

Environ Prog Sustainable Energy

View full text Add to dashboard Cite

show abstract

“…In this frequently used approach, the experimentally determined latent heat is incorporated into the apparent specific heat estimated by differentiating the DSC curves over a small but finite temperature interval. This technique is frequently used by researchers, especially when a CFD tool is employed [24]. By applying the apparent specific heat capacity approach, the actual enthalpy variation during the phase change (sensible and latent heat) is imitated [25].…”

Section: Mathematical Modelmentioning

confidence: 99%

Validation of a CFD model for the simulation of heat transfer in a tubes-in-tank PCM storage unit

et al. 2016

View full text Add to dashboard Cite

a b s t r a c tA computational fluid dynamics (CFD) model was developed for the simulation of a phase change thermal energy storage process in a 100 l cylindrical tank, horizontally placed. The model is validated with experimental data obtained for the same configuration. The cold storage unit was charged using water as the heat transfer medium, flowing inside a horizontal tube bundle, and the selected phase change material (PCM) was microencapsulated slurry in 45% w/w concentration. The mathematical model is based on the three-dimensional transient NaviereStokes equations with nonlinear temperature dependent thermo-physical properties of the PCM during the phase change range. These properties were experimentally determined using analytical methods. The governing equations were solved using the ANSYS/FLUENT commercial software package. The mathematical model is validated with experimental data for three different flow rates of the heat transfer fluid during the charging process. Bulk temperature, heat transfer rate and amount of energy stored were used as performance indicators. It was found that the PCM bulk temperatures were predicted within 5% of the experimental data. The results have also shown that the total accumulated energy was within 10% of the observed value, and thus it can be concluded that the model predicts the heat transfer inside the storage system with good accuracy.

show abstract

“…The charging efficiency ( ε ch ) at an instant is expressed as the ratio of energy stored to the maximum energy transfer and the inlet mass flow rate of HTF . It is expressed as,

ε_{ch} = \frac{T_{HTFI} - T_{HTFO} ((), t)}{T_{HTFI} - T_{ini}}

where T HTFO ( t ) is the transient temperature of HTF at the outlet of PBTES.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The charging efficiency (ε ch ) at an instant is expressed as the ratio of energy stored to the maximum energy transfer and the inlet mass flow rate of HTF. 51 It is expressed as,…”

Section: Charging Efficiencymentioning

confidence: 99%

Exergetic and performance analyses of two‐layered packed bed latent heat thermal energy storage system

Saha

Das

2019

Int J Energy Res

View full text Add to dashboard Cite

Summary In concentrating solar power (CSP) plant, a novel method involving the use of thermocline can be employed to augment the capability of the thermal energy storage system (TES). The rate of thermocline degradation can be reduced by packing encapsulated phase change material (PCM) in the TES. The thermal performance of the packed bed latent heat thermal energy storage system (PBTES) can be further enhanced by employing different diameters of PCM capsules arranged in multiple layers. In this paper, the thermal and exergetic performance of single‐layered and two‐layered PBTES is evaluated for varying mass flow rate, PCM capsule diameter and bed height of larger PCM capsules using a dynamic model based on simplified energy balance equations for PCM and heat transfer fluid (HTF). The single‐layered PBTES has a lower TES latent charging rate than the two‐layered PBTES. The charging efficiency and charging time of two‐layered PBTES are increased by 15.85% and 16.85%, respectively for reducing the HTF mass flow rate by 14.29%. A higher stratification number can be achieved by using a two‐layered PBTES instead of a single‐layered PBTES filled with the corresponding larger diameter PCM capsules. The second law efficiency of the two‐layered PBTES is found to be less than that of the single‐layered PBTES. A decrease in the bed height of larger PCM capsules decreases the exergetic efficiency of the two‐layered PBTES by 3.27%. The findings from this study can be used in further designing and optimising the multi‐layered PBTES.

show abstract

Experimental investigation of the LHS system and comparison of the stratification performance with the SHS system using CFD simulation

Cited by 33 publications

References 28 publications

Thermal performance enhancement of compound parabolic concentrator solar collector using latent heat thermal energy storage

Thermal performance enhancement of compound parabolic concentrator solar collector using latent heat thermal energy storage

Validation of a CFD model for the simulation of heat transfer in a tubes-in-tank PCM storage unit

Exergetic and performance analyses of two‐layered packed bed latent heat thermal energy storage system

Contact Info

Product

Resources

About