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The objective of this research was to study the performance of heat pump dryer using refrigerant R32 and ginger was selected as testing material. The experiments were conducted under conditions; drying temperature of 45, 50, and 55 °C and air velocity of 1.0, 1.5 and 2.0 ms-1. Drying rate, the specific moisture extraction rate, the specific energy consumption, and the coefficient of performance of heat pump were tested. The results revealed that the increment of drying temperature or air velocity resulted in increment of drying rate, power of heat pump dryer, and specific moisture extraction rate whilst specific energy consumption decreased. Additionally, it was revealed that drying temperature or air velocity did not affect the coefficient of performance of the heat pump.

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Para rubber solar greenhouse dryer is a one method of drying and it can be responded to requirement of agriculturist on amount of drying product. Present, the dryer was being built many type for made drying agriculture product. The air circulation and temperature scatter havent been used for the dryer built process, which are cause of fungus on product surface and product dehydrate not all over. Therefore, the objective of this research is to study temperature distributes and air circulations inside Para rubber solar greenhouse dryer of incline roof type using computational fluid dynamics method. The result showed that temperature and velocity of air were good distributing all area and havent air cluster under the roof.