空调和制冷设备 meaning in English

air conditioning &refrigeration equipment

Currently , limited information is available in the open literature on the performance and design of the air - conditioning and refrigerating systems using the hydrocarbons . so a great deal of work is still needed to do for using it properly
目前，由于公开发表的文献中有关使用hcs作制冷剂的空调和制冷设备的文章非常有限，所以有必要对r600a性能和设计作进一步的研究，以便r600a的推广使用。