| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ternary non-azeotropic refrigerant for ultra-low temperature service capable of offering service smoothly and stably without reconstructing the refrigerant circulation line of a conventional single-step type refrigerating system for ultra-low temperature service (unitary refrigeration circuit). <P>SOLUTION: The non-azeotropic refrigerant for ultra-low temperature service for use in a single-step type refrigerating system contains a high boiling point gas (boiling point at Tb1), a low boiling point gas (boiling point at Tb2), and an ultra-low boiling point gas (boiling point at Tb3), wherein the boiling points of three sorts of gases meet the condition -273°C≤Tb3≤-130°C<Tb2<-20°C≤Tb1≤+60°C, characterized by that the gas mixing by-weight composition proportion is set so that the dew point in the high pressure environment is at the room temperature or above and the boiling point is higher than the dew point in the low pressure environment. The invention allows enhancing the refrigerating ability effectively while the amount of fluorocarbon being used as refrigerant is made zero, and also assures an extraordinary small ill influence on the environment such as the green house effect. <P>COPYRIGHT: (C)2009,JPO&INPIT |
