The present work introduces an indirect approach for the estimation of the heat losses in TES (Thermal Energy Storage) tanks. Heat losses are calculated taking into account the fact that in steady state condition they are equal to the heat input provided by electric heaters. The proposed methodology has been tested in the TESLAB (Thermal Energy Storage LABoratory) tank which is equipped with two electric heaters simulating the heat input from solar irradiation. Heaters’ operation is controlled by an industrial PID (Proportional Integral Derivative) controller regulating their duty factor to achieve the desired set temperature. Total electric power is calculated as the summation of the contribution of each heater, which is equal to the product of the duty factor and the measured electric power. Heat losses for the TESLAB tank are compared with the measured losses during the cooling process satisfactorily. The proposed methodology could be also applied for the measurement of the heat losses of larger tanks, receivers and even CSP (Concentrated Solar Power) plants under operation without solar irradiation. Preliminary testing at the CSP-DSW (Concentrated Solar Power-Desalinated Sea Water) plant of The Cyprus Institute at PROTEAS (Platform for Research, Observation and TEchnological Applications in Solar energy) is quite promising.
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25 July 2019
SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems
2–5 October 2018
Casablanca, Morocco
Research Article|
July 25 2019
Experimental methodology for the heat losses estimation in TES tanks
Konstantinos G. Stokos;
Konstantinos G. Stokos
a)
The Cyprus Institute, Energy Environment and Water Research Center
, 20 Kavafi Str, Nicosia 2121, Cyprus
a)Corresponding author: k.stokos@cyi.ac.cy
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Marios C. Georgiou;
Marios C. Georgiou
The Cyprus Institute, Energy Environment and Water Research Center
, 20 Kavafi Str, Nicosia 2121, Cyprus
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Constantinos C. Roussos;
Constantinos C. Roussos
The Cyprus Institute, Energy Environment and Water Research Center
, 20 Kavafi Str, Nicosia 2121, Cyprus
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Efstathios Stiliaris;
Efstathios Stiliaris
The Cyprus Institute, Energy Environment and Water Research Center
, 20 Kavafi Str, Nicosia 2121, Cyprus
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Costas N. Papanicolas
Costas N. Papanicolas
The Cyprus Institute, Energy Environment and Water Research Center
, 20 Kavafi Str, Nicosia 2121, Cyprus
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a)Corresponding author: k.stokos@cyi.ac.cy
AIP Conf. Proc. 2126, 200030 (2019)
Citation
Konstantinos G. Stokos, Marios C. Georgiou, Constantinos C. Roussos, Efstathios Stiliaris, Costas N. Papanicolas; Experimental methodology for the heat losses estimation in TES tanks. AIP Conf. Proc. 25 July 2019; 2126 (1): 200030. https://doi.org/10.1063/1.5117745
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