A Comparative Study of Heat Pump Drying System Performances

열펌프를 이용한 건조시스템의 성능비교 연구

An energy efficient drying system, utilizing a heat pump to recover the wasted heat with high efficiency is proposed. In conventional drying systems, over-heating occurs through a condenser as the same amount of air is provided into the evaportator and the condenser. In order to prevent the over-heating, part of the outlet air from the drying chamber must be bypassed to increase the rate of vaporization in the drying chamber without release of the heat from the system. Since a part of the heat in the condenser is used to heat the air during the drying process of the proposed system, a high drying efficiency and low SPC(Specific Power Consumption) could be obtained, Comparing the performances between the proposed heat pump and a conventional one, it was found that the drying efficiency of the proposed heat pump is higher than that of the conventional heat pump by an amount of 7-25%.