solar air heater Articles
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A numerical evaluation of thermal performance of double flow packed bed solar air heaters
In this paper, double flow packed bed solar air heater was investigated theoretically and experimentally. A numerical model for the air heater was presented. Numerical calculations had been performed under Hamirpur (latitude, 31°25' to 31°52' North) prevailing weather conditions. A mathematical models based on the volumetric heat transfer coefficient have been developed. To solve this model and ...
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Exergetic performance evaluation of a single solar air heater with N sub collectors arranged in series or parallel configuration
The energy and exergy efficiency of the solar air heater (SAH) collector array consisting of a number of sub-collectors (N) arranged either in series or in parallel configuration have been evaluated for various values of collector aspect ratio (AR), mass flow rate per unit collection area (G) of the SAH collector array and N either in series or in parallel configuration for a given total ...
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Performance of a solar drier with and without heat storage material for copra drying
An indirect forced convection solar drier integrated with heat storage material was developed to test its performance for copra drying. The drier consists of a solar flat plate air heater integrated with a sensible heat storage unit, a drying chamber and a centrifugal blower. The experiments were carried out with and without the integration of heat storage materials. Sand mixed with aluminium ...
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Exergy analysis of an air solar heater
This paper presents an exergetic analysis of a downward flat plate collector, an unglazed selective absorber collector and an artificial rough surface collector. The analysis is based on mass, energy and exergy balance equations. The results show that for the Reynolds number of Re = 4000, the daily exergy output rate varies inversely with the mass flow rate per unit area, while the exergy ...
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Exergy analysis of a rock bed thermal storage system
In this paper, a thermodynamic procedure is presented to analyse energy and exergy balances of a rock bed thermal storage system. The thermal behaviour is described by means of a control volume that includes three subsystems: the solar collectors, the fluid distribution system and the storage chamber. Solar-to-thermal energy conversion was obtained by means of a solar collector at a fixed airflow ...
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Thermodynamic performance analysis of a hybrid Photovoltaic-Thermal (PV/T) integrated greenhouse air heater and dryer
In this paper, performance analysis of a hybrid photovoltaic-thermal (PV/T) greenhouse air heater and dryer has been carried out. Analytical expressions have been developed for: greenhouse air temperature, instantaneous and overall energy and exergy efficiencies for without load, and instantaneous exergy efficiency with load under forced mode operation. An experimental validation has been carried ...
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