题非常简单 可是我不会 请大家一定要帮我
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1. Arefrigerating system illustrated in figure employs R-12 and is operating on asimple saturated cycle with a temperature of -5ºC and a condensing temperatureof +40ºC. The Thermal capacity of the cycle is 20 kW. Determine the following:
a)The properties of P, T, v, and h for the refrigerant at state points 1, 2, 3,4, and 5
b)The compressor displacement in cubic decimetres per second required
c)The theoretical power in Watt required
d)The total heat rejected at the condenser in kilowatt
e)The coefficient of performance of the cycle
2.An ammonia refrigeration system produces 210 kW of refrigeration at an evaporating temperature of -24ºC andoperates with a condensing temperature of +30ºC. Subcooler after condensing is5º. How much compressor power is needed if:
a)The system operates on the standard vapour compression cycle
b)Two-stage compression is used with intercooling at an intermediate pressure of430 kPa
3.An air-flow rate of 2.2 m3/senters an evaporator coil at + 4ºC and a relative humidity of 90%. Air leavesthe coil at +0,5ºC and a relative humidity of 98%.
a)What is the refrigeration capacity of the coil?
b)What is the rate of water removal from the air?
图复制不上来 又有兴趣的大侠们可以 联系我QQ104868691 我把文件直接发给你
1. Arefrigerating system illustrated in figure employs R-12 and is operating on asimple saturated cycle with a temperature of -5ºC and a condensing temperatureof +40ºC. The Thermal capacity of the cycle is 20 kW. Determine the following:
a)The properties of P, T, v, and h for the refrigerant at state points 1, 2, 3,4, and 5
b)The compressor displacement in cubic decimetres per second required
c)The theoretical power in Watt required
d)The total heat rejected at the condenser in kilowatt
e)The coefficient of performance of the cycle
2.An ammonia refrigeration system produces 210 kW of refrigeration at an evaporating temperature of -24ºC andoperates with a condensing temperature of +30ºC. Subcooler after condensing is5º. How much compressor power is needed if:
a)The system operates on the standard vapour compression cycle
b)Two-stage compression is used with intercooling at an intermediate pressure of430 kPa
3.An air-flow rate of 2.2 m3/senters an evaporator coil at + 4ºC and a relative humidity of 90%. Air leavesthe coil at +0,5ºC and a relative humidity of 98%.
a)What is the refrigeration capacity of the coil?
b)What is the rate of water removal from the air?
