It is cheap that R290 has the good and economic.
R290价格低廉，具有良好的经济性。
The combustibility of R290 can completely control its safety.
R290的可燃性在实际中是完全可以控制其安全性。
The thesis studied the situation of performance matching for natural refrigerant propane (R290) instead of R22 in minitype room air conditioners.
本文研究了自然工质丙烷(R290)替代r 22在小型家用空调的性能匹配情况。
Through comparing, it is found that R290 has the quite coincident thermodynamic properties with R22, and the feasibility of the replacement of R22 by R290 is analyzed in theory.
通过对比，认为R 290与R 22的各种热力学性质比较接近，从理论上分析了用r 290替代r22的可行性。
Through comparing, it is found that R290 has the quite coincident thermodynamic properties with R22, and the feasibility of the replacement of R22 by R290 is analyzed in theory.
通过对比，认为R 290与R 22的各种热力学性质比较接近，从理论上分析了用r 290替代r22的可行性。
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