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Recently, instead of hot air type dryers that require a lot of heat, energy-efficient heat pump dryers have been used in various fields such as paper, textile, wood, food, etc. In this paper, the characteristics of heat pump cycle were theoretically evaluated with hot-gas bypass system to further improve the energy efficiency by minimizing the use of electric heaters in early warm-up stage of the dryers for frozen agricultural products. In addition, damper system that leads outside air to flow into the dryer were optimized to obtain extra heat for higher energy efficiency. Key Words : Heat pump, Dryer, Bypass, Damper, Energy efficiency      (20102020100430-12-2-100)     (2011-0024805)   . * Corresponding Author : Young Lim LeeTel: +82-41-521-9261 email: ylee@kongju.ac.kr 12 06 21  12 08 06  12 09 06 1.               .    , , ,        1970           (heat pump)   .[1]   1      .               .                   .            .

A Study on Cycle and Flow Analysis for Improvement of Energy Efficiency of a Heat Pump Dryer with Hot Bypass Gas and Air Dampers During Warm-up Stage