Combined solar heat and power system with a latent heat storage – system simulations for an economic assessment

Decentralized solar combined heat and power (CHP) systems can be economically feasible, especially when they have a thermal storage. In such systems, heat provided by solar thermal collectors is used to generate electricity and useful heat for e.g. industrial processes. For the supply of energy in t...

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Bibliographic Details
Main Authors: Zipf, Verena, Neuhäuser, Anton
Format: Conference Proceeding
Language:English
Subjects:
Cogeneration
Cost control
Design parameters
Economics
Energy storage
Fossil fuels
Heat exchangers
Heat storage
Latent heat
Mathematical analysis
Optimization
Photovoltaic cells
Present value
Solar collectors
Solar heating
Solar system
Storage capacity
Systems design
Temperature gradients
Thermal storage
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Summary:Decentralized solar combined heat and power (CHP) systems can be economically feasible, especially when they have a thermal storage. In such systems, heat provided by solar thermal collectors is used to generate electricity and useful heat for e.g. industrial processes. For the supply of energy in times without solar irradiation, a thermal storage can be integrated. In this work, the performance of a solar CHP system using an active latent heat storage with a screw heat exchanger is investigated. Annual yield calculations are conducted in order to calculate annual energy gains and, based on them; economic assumptions are used to calculated economic numbers in order to assess the system performance. The energy savings of a solar system, compared to a system with a fossil fuel supply, are calculated. Then the net present value and the dynamic payback are calculated with these savings, the initial investment costs and the operational costs. By interpretation and comparison of these economic numbers, an optimum system design in terms of solar field size and storage size was determined. It has been shown that the utilization of such systems can be economical in remote areas without gas and grid connection. Optimal storage design parameters in terms of the temperature differences in the heat exchanger and the storage capacity have been determined which can further increase the net present value of such system.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4949180