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Polystyrene beads supported phosphazene superbase as recyclable organocatalyst for ring-opening polymerization of δ-valerolactone

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  • Key Words:制冷循环;补气;能量分析;?分析;R134a;R1234yf

  • Abstract:由于R1234yf制冷剂具有优良的环保特性，使它成为了R134a的热门替代品之一。针对带补气的两级离心式冷水机组制冷循环系统，探究R1234yf工质替代R134a用于两级离心式冷水机组的可行性以及性能表现。基于热力学基本能量方程及?平衡方程，对相同流量下系统的COP、制冷量、?效率以及各部件不可逆损耗的占比情况进行了理论分析。结果表明：当环境温度为30℃时，相比于采用R134a的系统，采用R1234yf的系统COP降低了2.11%，?效率降低了2.79%。虽然系统性能略有降低，但R1234yf具有更加优良的环保特性，因此R1234yf可以作为离心式冷水机组中R134a的替代制冷剂。

  • Volume:v.36;No.172

  • Issue:03

  • Translation or Not:no

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