以1℃冷库贮藏后硬度为3.0 kg·cm^(-2)的‘金艳’猕猴桃果实为试材,采用微孔保鲜袋、不同厚度PE保鲜袋、气调保鲜袋及气体湿度调节包装袋6种不同处理对出库后的‘金艳’猕猴桃进行自发气调处理,以市售保鲜袋为对照,分析其对果实货...以1℃冷库贮藏后硬度为3.0 kg·cm^(-2)的‘金艳’猕猴桃果实为试材,采用微孔保鲜袋、不同厚度PE保鲜袋、气调保鲜袋及气体湿度调节包装袋6种不同处理对出库后的‘金艳’猕猴桃进行自发气调处理,以市售保鲜袋为对照,分析其对果实货架期及其内在品质的影响,以期筛选出适合猕猴桃货架期保鲜的气调包装。结果表明:气调包装处理可有效延长猕猴桃果实货架期,随处理时间延长,果实硬度、可滴定酸含量逐渐降低,失重率、腐烂率、可溶性固形物含量、固酸比逐渐升高,果实不断后熟软化,风味品质得以提升,但不同处理保鲜效果存在差异。果实品质各项评估指标综合评价与感官评价分析,果实货架期延长、果实品质提升效果依次为气体湿度调节包装袋>气调保鲜袋>0.04 mm PE保鲜袋>0.02 mm PE保鲜袋=0.03 mm PE保鲜袋=微孔保鲜袋>CK,气体湿度调节包装袋货架期整体表现更为优异,有效延长了果实货架期,维持了较好的果实品质。因此,兼具气体、湿度调节的包装袋在猕猴桃货架期保鲜中具有更广阔的应用前景。展开更多
The application of solar thermal energy to preheat cold fresh air for mechanical ventilation could save a lot of energy and ensure the stable operation of the ventilation system.In this paper,a kind of collector-stora...The application of solar thermal energy to preheat cold fresh air for mechanical ventilation could save a lot of energy and ensure the stable operation of the ventilation system.In this paper,a kind of collector-storage solar air heating system(CSSAHS),in which the thermal storage unit(TSU)is characterized by a dual S-channel for heat transfer,is proposed and the mathematical model for the integrated system was established.The model including the TSU,solar air collector,heat recovery device,and the fan was verified by an experimental study set up in a typical cold city in China.The model has been verified by experiments.The simulation results demonstrate that fresh air is the most important factor affecting storage/release efficiency.The increasing rate of heat release efficiency in the range of fresh air temperature-6-18°C is about 1.58%/°C.The solar heat collector area and the size of the TSU suitable for representative cities in cold regions are optimized based on multi-condition simulation analysis.The CSSAHS can preheat fresh air for 5 h after heat storage and the release efficiency is between 52 and 74%.Compared with other systems,the energy-saving rate of the CSSAHS is 26.5-33.3%in cold winter,and the heat supply ratio of the TSU is 24.4-35.1%.展开更多
文摘以1℃冷库贮藏后硬度为3.0 kg·cm^(-2)的‘金艳’猕猴桃果实为试材,采用微孔保鲜袋、不同厚度PE保鲜袋、气调保鲜袋及气体湿度调节包装袋6种不同处理对出库后的‘金艳’猕猴桃进行自发气调处理,以市售保鲜袋为对照,分析其对果实货架期及其内在品质的影响,以期筛选出适合猕猴桃货架期保鲜的气调包装。结果表明:气调包装处理可有效延长猕猴桃果实货架期,随处理时间延长,果实硬度、可滴定酸含量逐渐降低,失重率、腐烂率、可溶性固形物含量、固酸比逐渐升高,果实不断后熟软化,风味品质得以提升,但不同处理保鲜效果存在差异。果实品质各项评估指标综合评价与感官评价分析,果实货架期延长、果实品质提升效果依次为气体湿度调节包装袋>气调保鲜袋>0.04 mm PE保鲜袋>0.02 mm PE保鲜袋=0.03 mm PE保鲜袋=微孔保鲜袋>CK,气体湿度调节包装袋货架期整体表现更为优异,有效延长了果实货架期,维持了较好的果实品质。因此,兼具气体、湿度调节的包装袋在猕猴桃货架期保鲜中具有更广阔的应用前景。
基金This research was supported by the National Natural Science Fund of China(Grant Nos.52178082 and 51708365)innovative talents project of colleges and universities in Liaoning Province(2020389)Shenyang Science and technology planning project(21-108-9-03).
文摘The application of solar thermal energy to preheat cold fresh air for mechanical ventilation could save a lot of energy and ensure the stable operation of the ventilation system.In this paper,a kind of collector-storage solar air heating system(CSSAHS),in which the thermal storage unit(TSU)is characterized by a dual S-channel for heat transfer,is proposed and the mathematical model for the integrated system was established.The model including the TSU,solar air collector,heat recovery device,and the fan was verified by an experimental study set up in a typical cold city in China.The model has been verified by experiments.The simulation results demonstrate that fresh air is the most important factor affecting storage/release efficiency.The increasing rate of heat release efficiency in the range of fresh air temperature-6-18°C is about 1.58%/°C.The solar heat collector area and the size of the TSU suitable for representative cities in cold regions are optimized based on multi-condition simulation analysis.The CSSAHS can preheat fresh air for 5 h after heat storage and the release efficiency is between 52 and 74%.Compared with other systems,the energy-saving rate of the CSSAHS is 26.5-33.3%in cold winter,and the heat supply ratio of the TSU is 24.4-35.1%.
