差压预冷设备的匹配研究

通过对4种不同果蔬的预冷热负荷计算,分别得出了制冷机组压缩机所需功率与预冷时间、预冷质量的关系。在此基础上考虑到影响换热器的因素,计算出不同压缩机功率下冷凝器与蒸发器的面积。

苹果室内贮藏方法

(1)适时采收①接近成熟的苹果较耐贮藏,因此必须掌握果品耐贮期,一般金帅成熟期在花后145天左右,红星147天左右,如果短期贮藏可稍晚采收,长期贮藏应稍早采收。②一般成熟期越晚的品种越耐贮藏。(2)采后预冷采后的苹果带有大量的田间热,如不予冷就贮藏,贮藏效果不好。

苹果贮藏管理技术

苹果是深受人们喜爱的水果之一。为了延长鲜果供应期,增加经济收入。现将苹果贮藏窖的管理技术介绍如下:1.秋季管理。刚采收的苹果,带有田间热,要放在荫凉处预冷1-2天。苹果刚入窑时,要把窖温降到2℃以下,利用夜间零点以后窖外温低于窖内温之机,启开窖门和通气窗,使冷空气进入窖内,以降低窖温,日出前关闭窖门和通气窗。同时,要注意利用寒流降低窖温。2,冬季保低温。当窖温降至0～2℃时,封闭窖门。根据窖内温度变化情况,打开窖门上部的部分通气窗,利用哨眼,少量通气,进行气体小循环。

贮藏桔果须预贮

刚采下的桔果,带有田间热与表皮湿气,且仍有旺盛的活力,呼吸作用和水分蒸发都较强,不宜马上套薄膜袋贮藏,须先预贮后熟和通风冒汗后,再进行正式贮藏。否则容易烂果和枯水。

Field experiment on coalmine heat disaster governance using cold source from surface water

Regarding the lack of cold source for underground cooling systems from either mine inflow or return air, field experiments were taken in a high temperature deep coal mine with abundant cold source from surface water. Taking Sanhejian coal mine as an example, this paper introduced the technology scheme of heat disaster governance using surface water cold source. The paper presents the basics of this field experiment at the beginning, following by the design and site layout of the cooling system including the analysis and calculation of cold source. Numerical calculation method is also applied based on the operation parameters to simulate the influence to the surface river ecosystem. The results suggest that the temperature of surface water shall be lower than 34 ℃ after heat exchange, and when more cooling capacities are needed in the future, increasing the water flow is more favorable than increasing the cooling range of water, which is better for the ecological environment protection,

桔果预贮效果好

桔果采后,有些人怕桔皮沾染病菌,或是怕失水后减轻重量,于是就马上套薄膜袋贮藏。这样做,其实不利桔果贮藏,反而促使腐烂率高,枯水率高,贮期缩短。原因是:刚采下的桔果,不仅带有田间热与表皮湿气,且因具有旺盛的活力,呼吸作用和水分蒸发都较强。所以采后马上套袋,会加速桔果腐烂和枯水。我们曾在美国参观三个柑桔包装厂,发现他们都是将采后的桔果,先预贮后熟和通风冒汗后,再进行清洗、分级、印标、打蜡、装箱的。桔果预贮的作用有:1.能散发桔果的田间余热和果面水分;

果蔬保鲜分解残留农药技术获重大突破

一项用于瓜果蔬菜及食用菌等的保 鲜贮藏以及分解残留农药的新技术,最 近通过了河南省科技厅的正式鉴定。