Optimization of a solar cascaded phase change slab-plate heat exchanger thermal storage system

2020 ◽  
pp. 102005
Author(s):  
Saeed Nekoonam ◽  
Roghayeh Ghasempour
Keyword(s):  
Heat Exchanger ◽  
Phase Change ◽  
Storage System ◽  
Thermal Storage ◽  
Plate Heat Exchanger ◽  
Plate Heat

scholarly journals High-Temperature Chloride-Carbonate Phase Change Material: Thermal Performances and Modelling of a Packed Bed Storage System for Concentrating Solar Power Plants

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5339
Author(s):  
Giovanni Salvatore Sau ◽  
Valerio Tripi ◽  
Anna Chiara Tizzoni ◽  
Raffaele Liberatore ◽  
Emiliana Mansi ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Phase Change ◽  
Power Plants ◽  
Solar Power ◽  
Storage System ◽  
Ternary Eutectic ◽  
Thermal Storage ◽  
Packed Bed ◽  
Heat Transfer Fluid

Molten salts eutectics are promising candidates as phase change materials (PCMs) for thermal storage applications, especially considering the possibility to store and release heat at high temperatures. Although many compounds have been proposed for this purpose in the scientific literature, very few data are available regarding actual applications. In particular, there is a lack of information concerning thermal storage at temperatures around 600 °C, necessary for the coupling with a highly efficient Rankine cycle powered by concentrated solar power (CSP) plants. In this contest, the present work deals with a thermophysical behavior investigation of a storage heat exchanger containing a cost-effective and safe ternary eutectic, consisting of sodium chloride, potassium chloride, and sodium carbonate. This material was preliminarily and properly selected and characterized to comply with the necessary melting temperature and latent enthalpy. Then, an indirect heat exchanger was considered for the simulation, assuming aluminum capsules to confine the PCM, thus obtaining the maximum possible heat exchange surface and air at 5 bar as heat transfer fluid (HTF). The modelling was carried out setting the inlet and outlet air temperatures at, respectively, 290 °C and 550 °C, obtaining a realistic storage efficiency of around 0.6. Finally, a conservative investment cost was estimated for the storage system, demonstrating a real possible economic benefit in using these types of materials and heat exchange geometries, with the results varying, according to possible manufacturing prices, in a range from 25 to 40 EUR/kWh.

Thermal performance of a 10-kW phase-change plate heat exchanger with metal foam filled channels

2016 ◽  
Vol 99 ◽  
pp. 790-801 ◽  
Author(s):  
Gholamreza Bamorovat Abadi ◽  
Dae Yeon Kim ◽  
Sang Youl Yoon ◽  
Kyung Chun Kim
Keyword(s):  
Heat Exchanger ◽  
Phase Change ◽  
Thermal Performance ◽  
Metal Foam ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Foam Filled

scholarly journals Phase Change Process in a Zigzag Plate Latent Heat Storage System during Melting and Solidification

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4643
Author(s):  
Roohollah Babaei Mahani ◽  
Hayder I. Mohammed ◽  
Jasim M. Mahdi ◽  
Farhad Alamshahi ◽  
Mohammad Ghalambaz ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Phase Change ◽  
Phase Change Materials ◽  
Melting Rate ◽  
Plate Heat Exchanger ◽  
Melting Time ◽  
Latent Heat Storage ◽  
Plate Heat ◽  
Smooth Channel ◽  
Melting And Solidification

Applying a well-performing heat exchanger is an efficient way to fortify the relatively low thermal response of phase-change materials (PCMs), which have broad application prospects in the fields of thermal management and energy storage. In this study, an improved PCM melting and solidification in corrugated (zigzag) plate heat exchanger are numerically examined compared with smooth (flat) plate heat exchanger in both horizontal and vertical positions. The effects of the channel width (0.5 W, W, and 2 W) and the airflow temperature (318 K, 323 K, and 328 K) are exclusively studied and reported. The results reveal the much better performance of the horizontal corrugated configuration compared with the smooth channel during both melting and solidification modes. It is found that the melting rate is about 8% faster, and the average temperature is 4 K higher in the corrugated region compared with the smooth region because of the large heat-exchange surface area, which facilitates higher rates of heat transfer into the PCM channel. In addition to the higher performance, a more compact unit can be achieved using the corrugated system. Moreover, applying the half-width PCM channel accelerates the melting rate by eight times compared to the double-width channel. Meanwhile, applying thicker channels provides faster solidification rates. The melting rate is proportional to the airflow temperature. The PCM melts within 274 s when the airflow temperature is 328 K. However, the melting time increases to 460 s for the airflow temperature of 308 K. Moreover, the PCM solidifies in 250 s and 405 s in the cases of 318 K and 328 K airflow temperatures, respectively.

scholarly journals Waste heat recovery from diesel engine using custom designed heat exchanger and thermal storage system with nanoenhanced phase change material

2017 ◽  
Vol 21 (1 Part B) ◽  
pp. 715-727 ◽  
Author(s):  
John Wilson ◽  
Abhishek Singh ◽  
Abhinay Singh ◽  
Subramanian Ganapathy
Keyword(s):  
Heat Exchanger ◽  
Diesel Engine ◽  
Phase Change ◽  
Phase Change Material ◽  
Heat Recovery ◽  
Storage System ◽  
Thermal Storage ◽  
Heat Energy ◽  
Heat Extraction ◽  
Change Material

In this research study an attempt has been made to recover the heat energy of the exhaust gas from a Diesel engine, using a triangular finned shell and tube heat exchanger with segmental baffle at 20?, and efficiently store as sensible and latent heat energy using thermal storage tank having phase change material with CuO nanoparticles. The nanoparticles and the phase change material form the nanoparticle-enhanced phase change material and mainly the thermal conductivity of the phase change material can be enhanced through the dispersion of the nanoparticles. The temperature variations of the heat transfer fluid in the heat recovery heat exchanger with various load conditions of the Diesel engine are studied. The performance of the heat exchanger is evaluated using heat extraction rate and effectiveness. Evaluation of the performance of the thermal storage system can be analyzed by using the total heat energy stored and charging rate during the charging period for the selected nanoparticle-enhanced phase change material.

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