問題一覧
1
The enthalpy at the entrance of the condenser is 1660 KJ/KG and exit is 315 KJ/KG. The compressor has an enthalpy of 1450 KJ/KG at entrance. Determine the COP.
C. 5.4
2
An evaporator has a temperature of 3°C with entrance enthalpy of 352.Find the quality after expansion with entrance enthalpy of 352.75 Kj/kg, at 3°C, -319.56 Kj/kg, and hs=642.45
D. 10.27%
3
The refrigerating effect of 100 tons refrigeration is 117 KJ/kg. Determine the mass flow of refrigerant.
C. 3 kg/sec
4
The density of R-12 refrigerant at compressor suction is 19.81~kg/m^{3} For mass flow rate of 2 kg/sec, determine the flow at suction.
A. 0.10 m³/sec
5
A 100 tons refrigeration system has a Colt of 5 Determine the compressor horsepower
A. 94.20 Hp
6
A 90 tons refrigeration system has a compressor input of 0.97 KW per ton refrigeration and COP of 5: What is the effeciency of the compressor?
A. 72.49%
7
A 90 tons refrigeration system has a compressor input of 0.97 KW per ton refrigeration. If compressor efficiency is 75% determine the heat rejected from the condenser.
D. 382 KW
8
The mass flow rate of refrigerant entering the compressor is 0.25 kg/s and the change of enthalpy between the outlet is 320 KJ/kg. If 134 Hp motor is used to drive the compressor, determine the heat loss from the compressor.
A. 15 KW
9
The mass flow of refrigerant entering the compressor is 01 kg/sec with chane of enhtlapy of 400 kj/kg.For compressor efficiency of 70% and motor efficiency of 80%, find the electrical energy needed for one day.
D. 1714 KW-hr
10
An 80 tontiefrigeration system requires 105 KW from VECO. If motor compressor efficiency is 60%, find the COP.
C. 4.46
11
The change of enthalpy between the inlet and outlet of evaporator is 1000 KJ/kg and mass flow of refrigerant is 12 kg/m What is the capacity of plant?
C. 57 TR
12
The mass flow of water entering the condenser is 10 kg/sec. If the temperature difference between inlet temperature is 18°F, determine the heat rejected from the condenser.
B. 419 KW
13
The change of enthalpy is 1500 kj/kg required. The temperature change of water is 8°C and the refrigerant flow is 0.13 kg/sec. Determine the gpm of water required for cooling.
A. 92 gpm
14
The heat rejected from the condenser is 200 KW. The mass flow of water entering is 5 kg/sec at 23^{\circ}C. If the temperature between the cooling water outlet and condenser temperaturated sendenser temp?
D. 37.67°C
15
The heat rejected from Carnot refrigeration is 6000 KJ/min. The minimum and maximum temperature 25^{\circ}C and 72°C respectively. Determine the horsepower required to drive the compressor
C. 38 Hp
16
Refrigeration - 21 to dove the compressor in a Camot refrigeration is 50 Hp. It operates between -5°C and 40°C Determi the tons of refrigeration.
D. 63 TR
17
The temperature difference between the minimum and maximum temperature of Carnot cycle is 50°C. What is the minimum temperature if COP is 5.5
A 0.31°C
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42問 • 1年前問題一覧
1
The enthalpy at the entrance of the condenser is 1660 KJ/KG and exit is 315 KJ/KG. The compressor has an enthalpy of 1450 KJ/KG at entrance. Determine the COP.
C. 5.4
2
An evaporator has a temperature of 3°C with entrance enthalpy of 352.Find the quality after expansion with entrance enthalpy of 352.75 Kj/kg, at 3°C, -319.56 Kj/kg, and hs=642.45
D. 10.27%
3
The refrigerating effect of 100 tons refrigeration is 117 KJ/kg. Determine the mass flow of refrigerant.
C. 3 kg/sec
4
The density of R-12 refrigerant at compressor suction is 19.81~kg/m^{3} For mass flow rate of 2 kg/sec, determine the flow at suction.
A. 0.10 m³/sec
5
A 100 tons refrigeration system has a Colt of 5 Determine the compressor horsepower
A. 94.20 Hp
6
A 90 tons refrigeration system has a compressor input of 0.97 KW per ton refrigeration and COP of 5: What is the effeciency of the compressor?
A. 72.49%
7
A 90 tons refrigeration system has a compressor input of 0.97 KW per ton refrigeration. If compressor efficiency is 75% determine the heat rejected from the condenser.
D. 382 KW
8
The mass flow rate of refrigerant entering the compressor is 0.25 kg/s and the change of enthalpy between the outlet is 320 KJ/kg. If 134 Hp motor is used to drive the compressor, determine the heat loss from the compressor.
A. 15 KW
9
The mass flow of refrigerant entering the compressor is 01 kg/sec with chane of enhtlapy of 400 kj/kg.For compressor efficiency of 70% and motor efficiency of 80%, find the electrical energy needed for one day.
D. 1714 KW-hr
10
An 80 tontiefrigeration system requires 105 KW from VECO. If motor compressor efficiency is 60%, find the COP.
C. 4.46
11
The change of enthalpy between the inlet and outlet of evaporator is 1000 KJ/kg and mass flow of refrigerant is 12 kg/m What is the capacity of plant?
C. 57 TR
12
The mass flow of water entering the condenser is 10 kg/sec. If the temperature difference between inlet temperature is 18°F, determine the heat rejected from the condenser.
B. 419 KW
13
The change of enthalpy is 1500 kj/kg required. The temperature change of water is 8°C and the refrigerant flow is 0.13 kg/sec. Determine the gpm of water required for cooling.
A. 92 gpm
14
The heat rejected from the condenser is 200 KW. The mass flow of water entering is 5 kg/sec at 23^{\circ}C. If the temperature between the cooling water outlet and condenser temperaturated sendenser temp?
D. 37.67°C
15
The heat rejected from Carnot refrigeration is 6000 KJ/min. The minimum and maximum temperature 25^{\circ}C and 72°C respectively. Determine the horsepower required to drive the compressor
C. 38 Hp
16
Refrigeration - 21 to dove the compressor in a Camot refrigeration is 50 Hp. It operates between -5°C and 40°C Determi the tons of refrigeration.
D. 63 TR
17
The temperature difference between the minimum and maximum temperature of Carnot cycle is 50°C. What is the minimum temperature if COP is 5.5
A 0.31°C