Solar Assisted Heat Pump Dryer with a Multifunctional Thermal Collector

This research examined the drying performance of chilli using a solar assisted heat pump drying system combined with a multifunctional solar thermal collector.

The main objective was to evaluate moisture reduction, drying efficiency, and the influence of operating conditions such as air temperature, humidity, and mass flow rate.

A drying system was designed by integrating a heat pump with a solar thermal collector to enhance thermal efficiency. The system included a drying chamber, airflow control components, and a combined heating mechanism where both solar energy and the heat pump contributed to the drying process. Fresh chilli samples were prepared and placed in the drying chamber, and experiments were carried out under controlled conditions.

Drying experiments were conducted at different air mass flow rates. Environmental and operating parameters such as solar radiation, air temperature, and relative humidity were continuously monitored. Moisture content was measured over time using both wet basis and dry basis methods to evaluate the drying behaviour accurately.

The results showed a significant reduction in moisture content during the drying process. The drying rate was strongly influenced by the air temperature and mass flow rate. Higher temperatures and optimised airflow improved moisture removal and reduced drying time. The system achieved faster drying compared to conventional methods, particularly under conditions of higher temperature and lower humidity within the drying chamber.

The drying behaviour followed a decreasing trend in moisture content over time, indicating effective heat and mass transfer within the system. The combination of solar energy and heat pump technology provided stable drying conditions, even when solar radiation varied. This hybrid approach improved overall system efficiency and ensured consistent drying performance.

In conclusion, the solar assisted heat pump dryer proved to be an effective and reliable method for drying chilli. It reduced drying time, improved energy utilisation, and maintained controlled drying conditions. This system offers a practical solution for agricultural drying applications, especially in humid environments where traditional sun drying is less efficient.

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