scholarly journals Exploring the potential of a hybrid device combining solar water heating and molecular solar thermal energy storage

2017 ◽  
Vol 10 (3) ◽  
pp. 728-734 ◽  
Author(s):  
Ambra Dreos ◽  
Karl Börjesson ◽  
Zhihang Wang ◽  
Anna Roffey ◽  
Zack Norwood ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Energy System ◽  
Solar Thermal ◽  
Solar Thermal Energy ◽  
Water Heating ◽  
Solar Water Heating ◽  
Solar Water

A hybrid solar energy system consisting of a molecular solar thermal energy storage system (MOST) combined with a solar water heating system (SWH) is presented.

scholarly journals Modelling of solar thermal energy for household use in equatorial latitude by using the F-Chart model

2021 ◽  
Vol 19 ◽  
pp. 269-275
Author(s):  
Mateo Astudillo-Flores ◽  
◽  
Esteban Zalamea-Leon ◽  
Antonio Barragán-Escandón ◽  
M.R. Pelaez Samaniego ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Geographic Region ◽  
Hot Water ◽  
Solar Thermal ◽  
Solar Thermal Energy ◽  
Water Heating ◽  
Equatorial Latitude ◽  
Solar Water Heating ◽  
Solar Water ◽  
Residential Sector

The Andean Equatorial Region, due to its geographic location, shows great potential for using solar energy. Solar thermal energy is of interest in the residential sector in Ecuador and other Andean countries as a method to avoid fossilderived fuels consumption. However, previous learnings of the operation of solar water heating systems in other latitudes cannot be used in the conditions of Ecuador. Thus, the performance of the solar thermal energy systems in this geographic region deserves further study that consider typical high levels of cloudiness and fast climate oscillations. The objective of this work was to investigate the effect of the orientation of solar thermal plates on their energy efficiency and model the behaviour of these systems to predict their operation under Equatorial Andean climate conditions. For the F-Chart calibration different slopes angles were used, according to the typical roofs slopes in Cuenca, Ecuador. Results showed a monthly solar fraction, contributed by an evacuated tube collector is 26% higher than the flat plate collectors. The results also depict that, in the conditions of Cuenca, the greater solar water heating occurs when the collector is inclined 14° and facing towards the south. These findings can be used to predict the best operational conditions for using solar thermal energy collectors to produce hot water in the residential sector under equatorial highland altitude conditions.

Thermal Reliability of Paraffin Wax Phase Change Material for Thermal Energy Storage

2014 ◽  
Vol 699 ◽  
pp. 263-268 ◽  
Author(s):  
Saw Chun Lin ◽  
Hussain H. Al-Kayiem
Keyword(s):  
Thermal Properties ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Paraffin Wax ◽  
Water Heating ◽  
Thermal Reliability ◽  
Solar Water Heating ◽  
Solar Water

Phase change materials (PCMs) as thermal energy storage medium are proven to be effective to enhance the performance of solar thermal system. The degradation of the thermal properties due to thermal cycles is changeable and accordingly the performance of the solar thermal cycle may decline. In this study, the thermal reliability of paraffin wax was investigated to analyse the ability to be used as thermal energy storage (TES) for solar water heating purposes that subjected to many phase change cycles. The mixtures were subjected to 400 phase change cycles and the thermal properties were measured. Two samples were prepared; Sample 1 was paraffin wax without phase change cycles whereas Sample 2 was gone through 400 phase change cycles. Four hundred phase change cycles indicated the phase change cycles for 1 year 35 days as 1 cycle equivalent to 1 day. The comparison of samples with and without 400 phase change cycles showed slight changes in thermal conductivity, specific heat, melting point and solidification point. Fourier Transform Infrared Spectrometer and Thermogravimetric Analysis showed that after 400 phase change cycles there is no weight loss observed. The paraffin wax is hence found reliable to be use without any degradation, without any chemical reaction and slightly improvement of thermophysical properties as TES for solar water heating purposes.

scholarly journals 2E (Energy and Exergy) Analysis of ET-CPC Solar Collector Integrated with Different Configuration of Thermal Storage System

2022 ◽  
Author(s):  
Sathiya Satchi Christopher ◽  
Vellaisamy Kumaresan
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Solar Collector ◽  
Phase Change Materials ◽  
Storage System ◽  
Superior Performance ◽  
Solar Thermal Energy ◽  
Water Heating ◽  
Efficient Operation

Abstract The intermittency of solar thermal energy warrants the integration/utilization of thermal energy storage system for efficient operation. Effective utilization of solar water heating (SWH) system can reduce nearly 70 - 90 % of the energy cost incurred for water heating applications. In this study, a compound parabolic concentrator (CPC) solar collector is paired with thermal energy storage (TES) system for the improvement of thermal performance of the collector through enhanced heat transfer rate and minimizing the heat losses. Effects of varying mass flow rate and different arrangement of phase change materials (PCMs) on the performance of the CPC solar collector are investigated. A study of the influence of PCMs configurations in TES systems viz three PCMs (Case 1) and five PCMs (Case 2) on the energy efficiency, exergy efficiency and overall loss coefficient of the solar collector and TES system is made and compared with sensible TES system. The results show the attainment of maximum thermal efficiency of 70 % for ‘Case 2’. Comparison with ‘Case 1’, ‘Case 2’ exhibited a reduction heat loss of 4 % from the TES system. Results of exergy study reveal a superior performance in Case 2 over other configurations.

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