A kind of refrigerator-freezer(RF)termed frost-free refrigerator-freezer with secondary cooling medium was presented.
为了降低无霜冰箱采用可燃性制冷剂燃烧爆炸的危险性,提出了"二次冷媒无霜电冰箱"。
Based on the defrosting principles of frost-free refrigerator-freezers evaporator, this paper presented improved design scheme of defrosting system, including aluminum tube conducting defroster being converted into quartz tube radiating defroster and removing thermostat holddown groove.
依据无霜冰箱蒸发器化霜原理,针对现有化霜系统存在的问题,提出了改进的设计方案,把铝管加热化霜改为石英管辐射化霜,取消了化霜恒温器固定盒;通过对改进前后的比较与分析,证实了改进的可行性;分析表明,通过改进设计提高了冰箱工作的可靠性和经济性。
According to the meteorological observation in Minqin Desert Control Experiment Station,variations of frost-free period,low temperature in spring and frozen earth were analyzed.
以甘肃民勤治沙综合试验站数十年气象定点观测资料为基础,统计、分析了民勤荒漠区无霜期、春季低温、冻土层的变化特征。
Through comparison between several kinds of thermal indexes and analysis of China s climate characteristics,frost-free period is considered to be a proper thermal index of climatic zoning for grapevine in China.
在对目前酿酒葡萄区划热量指标进行总结和分析的基础上,通过对几种热量指标的比较和我国气候特点的分析认为,以无霜期作为我国酿酒葡萄区划的热量指标,即以无霜期≥160 d(30年平均值,且在30年中无霜期<150 d的次数不超过3次)作为我国酿酒葡萄栽培的热量最低限(区划北界)是适宜的,比其他热量指标确定的区划界限更有实际应用价值。
Based on the frost index defined by the daily minimum air temperature≤0 ℃,and the method of climate diagnosis,the climatic features of the first/last frost dates and frost-free period changes are analyzed with 3 national stations data of daily minimum temperatures in Dalian area from 1961 to 2006.
结果表明:近46年来,大连和瓦房店站均表现为初霜冻日推迟、终霜冻日提早、无霜冻期延长的变化趋势,其中瓦房店站表现得更为显著;庄河站的初霜冻日和终霜冻日表现出相似的变化,但各自的变化趋势不显著,而无霜冻期延长趋势显著;大连境内极早初霜冻日和极晚终霜冻日发生频数分别为1～3次和1～4次,大连最多,瓦房店最少;大连站的初霜冻日期存在2年和11年的显著周期,终霜冻日期存在22年的显著周期,庄河站的初霜冻日期和无霜冻期均存在11年左右显著周期;异常霜冻事件大连和庄河站20世纪60年代出现的频数最多,21世纪初最少;而瓦房店21世纪初异常霜冻事件出现的频数最多,20世纪80年代最少。
Based on the average annual temperature,annual precipitation and no frost period data from Shihezi Meteorological Bureau during the period of 1967-2006,the climate trend was analyzed using linear fitting method,3-year smoothing average and M-K methods.
以新疆石河子气象局1967～2006年年平均气温、降水量和无霜期观测资料为研究对象,运用线性拟合、3a滑动平均和Mann—Kendall方法进行趋势和突变分析。
In this paper, the data of the average annual temperature, annual precipitation and no frost period,which gotten from Shihezi Meteorological Bureau during the period of 1967~ 2006, have been analyzed by linear fitting method, smooth average method of three years and M-K method to get their trend and correlation.
本文以新疆石河子气象局1967～2006年年平均气温、年降水量和无霜期观测资料为研究对象,运用线性拟合方法、三年滑动平均方法、Mann—Kendall方法进行趋势和突变分析。