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Numerical simulation of a forced circulation solar water heating system
Ahmed Remlaoui1, Driss Nehari1, Benhanifia Kada2
1Applied Hydrology and Environment Laboratory , University of Ain Témouchent -BELHADJ Bouchaib , 46000, Ain-Témouchent, Algeria.
Scientific Reports
|November 23, 2024
Summary
This study developed a TRNSYS model for forced circulation solar water heating systems in Algeria, showing high solar fractions over 84% in September and ensuring consistent hot water temperatures for homes.
Area of Science:
- Renewable Energy Systems
- Solar Thermal Applications
- Numerical Modeling and Simulation
Background:
- Algeria's climate presents unique challenges and opportunities for solar water heating.
- Residential hot water demand requires efficient and reliable heating solutions.
- Forced circulation solar water heating systems (FC-SWHs) offer potential for domestic use.
Purpose of the Study:
- To develop and validate a sophisticated numerical simulation model for FC-SWHs tailored to Algerian climatic conditions.
- To assess the system's performance in meeting the daily hot water needs (246 L) of single-family houses.
- To analyze thermal performance, energy efficiency, and auxiliary heating requirements.
Main Methods:
- Utilized TRNSYS dynamic simulation software for modeling the FC-SWH system.
- Validated the model against collector outlet temperature data from existing literature.
- Analyzed key performance indicators including solar fraction, thermal efficiency, and energy gains.
Main Results:
- The model achieved maximum monthly average collector outlet temperatures of 38°C (September) and peak energy gains of 250 W (August).
- The system consistently provided hot water between 55°C and 57°C, with a mixer exit temperature of 47°C for cooler applications.
- Solar fractions exceeded 84% in September, remaining above 60% for most of the year, with thermal efficiencies ranging from 43% to 73%.
Conclusions:
- The TRNSYS model accurately simulates FC-SWH performance for Algerian climates, confirming its suitability for residential applications.
- The system demonstrates significant potential for reducing reliance on auxiliary heating, contributing to sustainable energy independence in Algeria.
- Climate-specific design and performance analysis are crucial for optimizing solar water heating systems in diverse geographical regions.
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