某单级缩蒸汽理论制冷循环,工质为R22,机械效率ηm=0.9理论比功wO=43.98kJ/kg,指示比功wi=67.77kJ/kg,制冷机质量流量qm=0.5,求压缩机的理论功率、指示功率和轴功率约为下列哪一项()
A.37.59kW,21.99kW,33.8kW
B.21.99kW,37.59kW,33.83kW
C.33.83kW,21.99kW,37.59kW
D.21.99kW,33.38kW,37.59kW
A.37.59kW,21.99kW,33.8kW
B.21.99kW,37.59kW,33.83kW
C.33.83kW,21.99kW,37.59kW
D.21.99kW,33.38kW,37.59kW
A.37.59kW,21.99kW,33.8kW
B. 21.99kW,37.59kW,33.83kW
C. 33.83kW,21.99kW,37.59kW
D. 21.99kW,33.38kW,37.59kW
计算题:某单级压缩蒸气理论制冷循环,工质为R22,h1=365.43kJ/kg,h2=471.68kJ/kg,h3=239.2kJ/kg,制冷剂流量qm=0.5kg/s,试问冷凝器的热负荷为何值。
计算题:假定循环为单级压缩蒸气制冷的理论循环,蒸发温度t0=-10℃,冷凝温度为35℃,工质为R22,循环的制冷量Q0=55kw,试对该循环进行热力计算。(根据R22的热力性质表,查出处于饱和线上的有关状态参数值:h1=401.555kJ/kg,v1=0.0653m3/kg,h3=h4=243.114kJ/kg,p0=0.3543MPa,pk=1.3548Mpa,h2=435.2kJ/kg,t2=57℃)
A.0.748
B.0.688
C.0.626
D.0.627
A.R22和R717都可采用回热制冷循环;
B. R22和R717都不可采用回热制冷循环;
C. R22和R502都可采用回热制冷循环;
D. R22和R502都不可采用回热制冷循环
A.1.9-2.2
B.2.3-2.6
C.2.7-3.0
D.3.1-3.4
A.1.9-2.2
B.2.3-2.6
C.2.7-3.0
D.3.1-3.4
A.R22和R717都可采用回热制冷循环;
B.R22和R717都不可采用回热制冷循环;
C.R22和R502都可采用回热制冷循环;
D.R22和R502都不可采用回热制冷循环
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