A method to determine stratification efficiency of thermal energy storage processes independently from storage heat losses

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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A method to determine stratification efficiency of thermal energy storage processes independently from storage heat losses. / Haller, M.Y.; Yazdanshenas, Eshagh; Andersen, Elsa; Bales, C.; Streicher, W.; Furbo, Simon.

In: Solar Energy, Vol. 84, No. 6, 2010, p. 997-1007.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Haller, M.Y.; Yazdanshenas, Eshagh; Andersen, Elsa; Bales, C.; Streicher, W.; Furbo, Simon / A method to determine stratification efficiency of thermal energy storage processes independently from storage heat losses.

In: Solar Energy, Vol. 84, No. 6, 2010, p. 997-1007.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Bibtex

@article{15dacd9cae1048fa8b5aa7fcaaac1d88,
title = "A method to determine stratification efficiency of thermal energy storage processes independently from storage heat losses",
keywords = "Solar heating systems, Thermocline, Thermal stratification, Thermal energy storage",
publisher = "Pergamon",
author = "M.Y. Haller and Eshagh Yazdanshenas and Elsa Andersen and C. Bales and W. Streicher and Simon Furbo",
year = "2010",
doi = "10.1016/j.solener.2010.03.009",
volume = "84",
number = "6",
pages = "997--1007",
journal = "Solar Energy",
issn = "0038-092X",

}

RIS

TY - JOUR

T1 - A method to determine stratification efficiency of thermal energy storage processes independently from storage heat losses

A1 - Haller,M.Y.

A1 - Yazdanshenas,Eshagh

A1 - Andersen,Elsa

A1 - Bales,C.

A1 - Streicher,W.

A1 - Furbo,Simon

AU - Haller,M.Y.

AU - Yazdanshenas,Eshagh

AU - Andersen,Elsa

AU - Bales,C.

AU - Streicher,W.

AU - Furbo,Simon

PB - Pergamon

PY - 2010

Y1 - 2010

N2 - A new method for the calculation of a stratification efficiency of thermal energy storages based on the second law of thermodynamics is presented. The biasing influence of heat losses is studied theoretically and experimentally. Theoretically, it does not make a difference if the stratification efficiency is calculated based on entropy balances or based on exergy balances. In practice, however, exergy balances are less affected by measurement uncertainties, whereas entropy balances can not be recommended if measurement uncertainties are not corrected in a way that the energy balance of the storage process is in agreement with the first law of thermodynamics. A comparison of the stratification efficiencies obtained from experimental results of charging, standby, and discharging processes gives meaningful insights into the different mixing behaviors of a storage tank that is charged and discharged directly, and a tank-in-tank system whose outer tank is charged and the inner tank is discharged thereafter. The new method has a great potential for the comparison of the stratification efficiencies of thermal energy storages and storage components such as stratifying devices.

AB - A new method for the calculation of a stratification efficiency of thermal energy storages based on the second law of thermodynamics is presented. The biasing influence of heat losses is studied theoretically and experimentally. Theoretically, it does not make a difference if the stratification efficiency is calculated based on entropy balances or based on exergy balances. In practice, however, exergy balances are less affected by measurement uncertainties, whereas entropy balances can not be recommended if measurement uncertainties are not corrected in a way that the energy balance of the storage process is in agreement with the first law of thermodynamics. A comparison of the stratification efficiencies obtained from experimental results of charging, standby, and discharging processes gives meaningful insights into the different mixing behaviors of a storage tank that is charged and discharged directly, and a tank-in-tank system whose outer tank is charged and the inner tank is discharged thereafter. The new method has a great potential for the comparison of the stratification efficiencies of thermal energy storages and storage components such as stratifying devices.

KW - Solar heating systems

KW - Thermocline

KW - Thermal stratification

KW - Thermal energy storage

U2 - 10.1016/j.solener.2010.03.009

DO - 10.1016/j.solener.2010.03.009

JO - Solar Energy

JF - Solar Energy

SN - 0038-092X

IS - 6

VL - 84

SP - 997

EP - 1007

ER -