Sensitivity of long-term performance simulations of solar energy systems to the degree of stratification in the thermal storage unit

Arias, Diego A.; McMahan, Andrew C.; Klein, S.A.

doi:10.1002/er.1344

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…In fact, the results are very similar to the work proposed by Roja and Bayon [11] that also used a numerical technique which is certainly affected by the choice of the number of nodes. It has been shown in [19],…”

Section: Comparison With Literature Datamentioning

confidence: 95%

CFD-based reduced model for the simulation of thermocline thermal energy storage systems

Pizzolato

Donato

Verda

et al. 2015

Applied Thermal Engineering

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Section: Comparison With Literature Datamentioning

confidence: 95%

CFD-based reduced model for the simulation of thermocline thermal energy storage systems

Pizzolato

Donato

Verda

et al. 2015

Applied Thermal Engineering

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“…It is important to highlight that the method is valid if applied under operating conditions with no excessive turbulence at the inlet. Arias et al [33] investigated, by means of simulations, the sensibility of the long-term performance of solar energy systems equipped with an HWST to the number of discrete sections or nodes used to model the storage system temperature distribution and the degree of stratification. Their findings diverge from those reported here as the research approach showed significant differences.…”

Section: Sensitivity Of the Vtc Methods To The Decrease In The Experimental Temperature Data Points Usedmentioning

confidence: 99%

Minimum Number of Experimental Data for the Thermal Characterization of a Hot Water Storage Tank

2021

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This paper demonstrates that it is possible to characterize the water temperature profile and its temporal trend in a hot water storage tank during the thermal charge process, using a minimum number of thermocouples (TC), with minor differences compared to experimental data. Four experimental tests (two types of inlet and two water flow rates) were conducted in a 950 L capacity tank. For each experimental test (with 12 TC), four models were developed using a decreasing number of TC (7, 4, 3 and 2, respectively). The results of the estimation of water temperature obtained with each of the four models were compared with those of a fifth model performed with 12 TC. All models were tested for constant inlet temperature. Very acceptable results were achieved (RMSE between 0.2065 °C and 0.8706 °C in models with 3 TC). The models were also useful to estimate the water temperature profile and the evolution of thermocline thickness even with only 3 TC (RMSE between 0.00247 °C and 0.00292 °C). A comparison with a CFD model was carried out to complete the study with very small differences between both approaches when applied to the estimation of the instantaneous temperature profile. The proposed methodology has proven to be very effective in estimating several of the temperature-based indices commonly employed to evaluate thermal stratification in water storage tanks, with only two or three experimental temperature data measurements. It can also be used as a complementary tool to other techniques such as the validation of numerical simulations or in cases where only a few experimental temperature values are available.

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“…A thermodynamic procedure to analyze the energy and exergy balances of a rock bed thermal storage system was presented in [25]. A numerical investigation on the sensitivity of the long-term performance simulations of solar energy systems to the degree of stratification in both liquid and packed bed storage units was carried out in [26].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of sensible thermal energy storage in high temperature solar systems

Andreozzi¹,

Bianco²,

Manca³

et al. 2009

WIT Transactions on Modelling and Simulation

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A study on sensible thermal energy storage (TES) for high temperature solar systems is numerically accomplished. The high temperature TES is cylindrical, the fluid and the solid thermo-physical properties are temperature independent and the radiation heat transfer mechanism is neglected. A parametric analysis is carried out. The commercial CFD Fluent code is used to solve the governing equations in the transient regime. Numerical simulations are carried out at different mass velocity values of the heat-carrying fluid and porosity of the storage medium. The results show the effects of the porosity and of the working fluid mass velocity on the stored thermal energy and on the storage time.

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Sensitivity of long-term performance simulations of solar energy systems to the degree of stratification in the thermal storage unit

Cited by 14 publications

References 9 publications

CFD-based reduced model for the simulation of thermocline thermal energy storage systems

CFD-based reduced model for the simulation of thermocline thermal energy storage systems

Minimum Number of Experimental Data for the Thermal Characterization of a Hot Water Storage Tank

Numerical investigation of sensible thermal energy storage in high temperature solar systems

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