水产品热泵干燥装置性能参数的理论分析

为了降低水产品干燥加工能耗，该文以能源效率和除湿能耗比为指标，对热泵干燥装置性能参数的影响因素进行了分析。根据水产品干燥特性和亚热带地区气候特点，首先对开式热泵干燥系统和闭式热泵干燥系统的能源效率进行了比较；然后以闭式热泵干燥装置为例，对其除湿能耗比的影响因素进行了分析。结果表明，闭式热泵干燥装置的能源效率为2.52，而开式热泵干燥装置的能源效率为2.39，两者相差不大；蒸发温度和冷凝温度对热泵干燥系统的除湿能耗比均有明显的影响，其中蒸发温度的影响尤为显著；为了提高除湿能耗比，可提高蒸发温度和降低冷凝温度。

Analysis on performance parameters of heat pump drying system

Taking energy efficiency and specific moisture evaporation rate(SMER) as indicators, the performance parameter of heat pump drying system was investigated in order to reduce energy consumption of aquatic product drying process. The energy efficiency of opened heat pump drying system was compared with that of the closed heat pump drying system according to drying characteristics of aquatic product and climate characteristics of subtropical region, and the SMER of closed heat pump drying system was analyzed. The results showed the energy efficiency of opened and closed heat pump systems had little difference with the energy efficiency of 2.39 and 2.52 respectively. Both evaporation temperature and condensing temperature had obvious influence on the SMER, and the former influence was more significant than the latter one. In order to improve the SMER and ensure the productivity, the condensing temperature should be dropped while the evaporation temperature should be increased.