现代制冷工业以燃料市场日益增长和节约能源的国际竞争为背景,正在经历一个飞跃发展的时代。根据1987年世界制冷空调产销量的统计,英语美洲、日本和欧洲虽然人口只占世界25％但制冷产品的销售额却占90％。发达国家的冷冻食品和温控条件对市场增长的潜力是巨大的。它和该地区的经济发展有关。有些旧式制冷设备由于效率不高、不合用等需要换代更新。许多运输工具包括轿车、客车、飞机、冷藏汽车、列车、船舶等需要装置新的 The modern refrigeration industry is experiencing an era of rapid development in the context of the growing international competition in fuel markets and energy conservation. According to 1987 world production and sales of refrigeration and air-conditioning statistics, English-American, Japan and Europe, although the population accounts for only 25% of the world but sales of refrigeration products account for 90%. The potential for market growth for frozen foods and temperature control in developed countries is enormous. It is related to the economic development of the area. Some old-style refrigeration equipment due to inefficiency, useless, etc. need to be updated. Many means of transport include cars, buses, airplanes, refrigerated cars, trains, ships, etc. Needed to install new