Agricultural products are harvested at moisture contents much higher than safe range for storage them. Therefore, they are dried to prevent quality deterioration. Drying is a bidirectional process in which, heat transfer from heating source to product surface and from surface into the product center and moisture transfer from product internal parts to its surface and from surface to the environment occurs. On the other hand drying is an energy intensive operation. Heat pump drying is one of the technologies that could play a significant role in quality increasing and reducing energy consumption, especially in drying of high-value products that require controlled conditions of drying. In this investigation a heat pump dryer with on-line scaling ability to obtain drying kinetics was designed and built in order to evaluate heat pump drying effect on dried product quality and energy consumption in comparison with (without heat pump) dryer. In this apparatus, a centrifugal fan supplied the airflow required for drying and with a 3phase-driver motor of 2hp and maximum speed of 2800 rpm. The air can reach to the desired temperature by passing from an electrical heater with 6 elements and total heat capacity of 4.2kW. The drying chamber was selected of a Plexiglas tube with circle cross section of 14 cm internal diameter. In this dryer to control the dryer air temperature, a controller with ability of electrical current control was used. In the heat pump system designed and fabricated a compressor with ¼ Hp, an evaporator, an expansion valve and two condensers were considered. Isfahan rough rice was selected to conduct the experiments. Drying tests were performed with heat pump dryer and conventional dryer. The bed depth and dryer air velocity and temperature were 20 cm, 1 m/s and 35°, respectively. Fissured kernel percentage after drying with heat pump and conventional dryers were measured 15.33 and 19.33%, respectively. Power consumptions of heat pump dyer and dryer without heat pump were 772 and 925.23 W, respectively.