Parametric and numerical study of a solar system for heating a greenhouse equipped with a buried exchanger

•Parametric and numerical study of a solar system for heating a greenhouse.•Study of a berried exchangers heating system.•Highlight the improvement in the efficiency of the system after this study.•Give a solution to reduce thermal loses. This paper presents a TRNSYS simulation to evaluate the perfo...

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Bibliographic Details
Published in:Energy conversion and management 2013-06, Vol.70, p.163-173
Main Authors: Attar, I., Naili, N., Khalifa, N., Hazami, M., Farhat, A.
Format: Article
Language:English
Subjects:
Accumulators
Agricultural greenhouse
Applied sciences
Collectors
Energy
Equipments, installations and applications
Exact sciences and technology
Flat plate collector
Greenhouses
Heat exchangers
Heating
Heating system
Inlet flow
Lycopersicon esculentum
Natural energy
Numerical simulation (Transys16)
Solar energy
Solar thermal conversion
Storage tank
Storage tanks
Tanks
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Summary:•Parametric and numerical study of a solar system for heating a greenhouse.•Study of a berried exchangers heating system.•Highlight the improvement in the efficiency of the system after this study.•Give a solution to reduce thermal loses. This paper presents a TRNSYS simulation to evaluate the performances of a solar water heating system (SWHS) used for greenhouses according to Tunisian weather. The SWHS is mainly composed of two solar collectors, with a 4m2 total surface, related to a 200L storage tank and a capillary polypropylene heat exchanger integrated to the greenhouse. During the simulation all combinations possible of the two solar collectors (series and parallels) are investigated. The parameters which have influence on the storage system, like the inlet flow rate, tank volume and collector area are also investigated. The results of simulation show that, by increasing the tank volume, the temperature at the collector outlet decreases. In addition, high flow rate minimizes the phenomenon of stratification and increases the efficiency of the system. We notice that decreasing the exchanger inlet flow rate is good solution to reduce heating loses. The best storage system we found will be used as our greenhouse heating system. In fact, the choosen heating system according to this parametric analysis, mainly composed of a flat plate collector and a 200L tank, can increase the inside air temperature of the greenhouse by 5°C and make it suitable for tomatoes agriculture.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2013.02.017