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Hybridizing PV, sand storage, solar thermal energy for steam generation – pv magazine International


A Finnish-Swedish consortium has designed a hybrid system that makes use of photovoltaics and photo voltaic thermal power individually to supply steam to industrial services. The PV unit is built-in with a sand-based thermal storage system and is reported to contribute to decrease power prices all through the system.

A Swedish-Finnish crew of researchers has designed an power system for steam technology within the meals and beverage business that makes use of photo voltaic thermal power and photovoltaics linked to sand-based warmth storage.

The proposed system combines a photo voltaic thermal plant primarily based on parabolic trough collectors (PTCs) related to water storage and a photovoltaic facility mixed with a sand-based high-temperature warmth storage system. Each services are deliberate to supply warmth individually to the identical industrial facility, with the PV unit used when the photo voltaic thermal plant can not meet the heating demand.

The scientists defined that the operation of the photo voltaic thermal plant ought to all the time be given precedence as a result of it will possibly generate steam on the most economical value of heating. As well as, they are saying that the system should additionally depend on a 3rd backup heating system, resembling a typical industrial boiler, which ought to solely be used when the 2 photo voltaic installations will not be sufficient to fulfill the necessity for heating.

The group modeled the hybrid system utilizing TRNSYS software program, which was used to simulate the habits of transient renewable techniques. It then makes use of Python software program to simulate the interplay of the photo voltaic collector and the load.

4 totally different eventualities are analyzed: a reference case the place warmth is offered solely by a traditional boiler; a system configuration primarily based on the boiler and the photo voltaic thermal plant mixed with water storage; a hybrid system utilizing a boiler and a PV plant linked to sand storage; and a system that makes use of two photo voltaic applied sciences related to their respective storage techniques.

Researchers imagine that the system and the economic constructing will probably be positioned in Sevilla, southern Spain.

By way of their techno-economic evaluation, they discovered the fourth system configuration utilizing two photo voltaic applied sciences supplies the bottom levelized value of warmth (LCOH) of €83.5 ($93.9)/MWh. The best LCOH is obtainable by the system primarily based on the standard boiler alone at €100/MWh, whereas the system primarily based on PV steam technology with out photo voltaic thermal power achieves an LCOH of €90/MWh. A system primarily based on photo voltaic thermal power with out PV reaches an LCOH of €84/MWh.

“In an built-in system, PTC and PV techniques complement one another to realize higher financial efficiency and land space, whereas additionally attaining a excessive mixed space of photo voltaic,” stated the scientists, including that this hybrid system supplies one of the best space financial savings of approx. 20,000 m2. Additionally they emphasised that the photo voltaic thermal unit can meet 30% of the heating wants of the economic facility, with the PV unit and the boiler overlaying 60% and 10%, respectively.

They launched the research system”Techno-economic evaluation of a novel hybrid system of photo voltaic thermal and photovoltaic pushed sand storage for sustainable industrial steam manufacturing,” printed in Power Conversion and Administration. The analysis crew consists of scientists from Dalarna College in Sweden, Finnish sand storage system supplier Polar Night time Power Oy, and Sweden-based photo voltaic thermal specialist Absolicon Photo voltaic Collectors AB.

Polar Night time Power has developed a sand storage system that pv journal reported about July 2022. The system is enclosed in an extended iron container and is ready to retailer electrical energy within the type of warmth for a number of months at a temperature between 500 C and 600 C. The system makes use of the frequent dry sand with none particular therapy because the storage medium and dealing in pipes with air. When this air is heated, it’s pumped via pipes and reaches the sand, which is heated as much as 600 C.

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