Air 0°C 1 atm 5 m/s S7 = 1.5 cm 0.8 m 0.8 cm S=1.5 cm/ Refrigerant, -20°C
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The air in the evaporator section of a refrigerator will be cooled by passing it over a bundle of pipes with an outer diameter of 0.8 cm and a length of 0.8 m, in which the refrigerant is evaporated at -20°C. Air approaches the pipe bundle perpendicularly with an average speed of 5 m/s at 0°C and 1 atm.The sticks are arranged in a staggered manner.
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- 1. A single-acting, single-cylinder air compressor is rated at 4.25 (m)^3/min of air. The suction conditions are 1 atm and 27 C and discharge pressure is 1034 kPa. The compression process follows the equation PV^1.35 = C. Determine the power, in kW, required to compress the air. a. -30.22 kW b. -22.87 kW c. -82.27 kW d. -27.22 kWWhat would be the resultant force F of the triangular distributed load and its location d measured from point A.A six 67 x 57 mm refrigerant 22 compressor operating at 30 rps indicate a refrigerating capacity of 96 kW and a power requirements of 19 kW at an evaporating temp of 50C and a condensing temp of 350 C. compute: a) clearance volumetric eff c= 5% v2=20 L/kg, h2=428 kJ/kg b) actual volumetric eff c) compression eff
- 1. An engine operating on the air standard heat engine has 13 KJ heat added at isochoric process, heat ratio of air = 1.35. If the minimum pressure and temperature are 101 KPa and 305 K, respectively. The maximum volume of 3.8 x 10 2 m³ with clearance of 10%. Determine • The work of cycle in KJ • The mep in MPaA single-acting, single-cylinder air compressor is rated at 4.25 m3/min of air. The suction conditions are 1 atm and 27 C and discharge pressure is 1034 kPa. The compression process follows the equation PV1.35 = A. Determine the power, in kW, required to compress the air. B.)what is the engine kW power needed to drive the unit if the combined engine-compressor efficiency is 84%? C.)if the compressor is to run two-stage at optimum intercooler pressure with perfect intercooling, what will be percentage of power saved?Q 1: For a particular gas system, the internal energy is given by : U = 2.5 PV + C , where P: Presure , V: volume and C: constant, the sysytem is taken into cycle shown in fig.(Q1) below with three Processes, Calculate Q & W if the pressure is given by P= 105 + 10° (v-0.02)² ? 05 04 V (m') Fig. (Q1) 02: Arigid tank of (0.3 m) at 15.5 bar , if 90% of mass is liquid water, how much heat must be added before the tank becomes just full of the liquid? 03/ An ideal gas is changed from pl = 1bar, vl= 10m³ to p2 =10 bar , v2 = 1m², calculate Q & W for the follwing process: a- Isothermal process. b- adiabatic compression followed by cooling process at constant pressure. c- Heating at constant volume followed by cooling at constant pressure? Take Cp= (5/2)R & Cv=(3/2) R Q4: A tank having a volume of 0.85 m³ initially contains water as a two-phase liquid- vapor mixture at 260°C and a quality of 0.7. Saturated water vapor at 260°C is slowly withdrawn through a pressure-regulating valve at the top…
- A large mining company was provided with a 3 cu. meters of compressed air tank. Air pressure in the tank drops from 700 kPa to 180 kPa while the temperature remains unchanged to 28 degree C. What percentage has the mass of air in the tank been reduced? a. 74 b. 72 c. 78 d. 80 e. 76Q 1: For a particular gas system, the internal energy is given by : U = 2.5 PV + C , where P: Presure , V: volume and C : constant, the sysytem is taken into cycle shown in fig.(Q1) below with three Processes, Calculate Q & W if the pressure is given by P= 105 + 10° (v-0.02)² ? 0.5 0.4 0.3 0.2 B A 0.1 001 002 003 V (m³) -> Fig. (Q1) P (MPa)►Q 1: For a particular gas system, the internal energy is given by : U = 2.5 PV + C , where P: Presure , V: volume and C : constant, the sysytem is taken into cycle shown in fig.(Q1) below with three Processes, Calculate Q & W if the pressure is given by P= 105+ 10° (v-0.02)² ? 05- 0.4 0.3E A 02E 0.1 0.01 002 003 V (m³) -> Fig. (Q1) P (MPa)
- Q 1: For a particular gas system, the internal energy is given by : U = 2.5 PV + C , where P: Presure , V: volume and C : constant, the sysytem is taken into cycle shown in fig.(Q1) below with three Processes, Calculate Q & W if the pressure is given by P= 105+ 10° (v-0.02)² ? 0.5- 0.4E 0.3E A 0,2 A 001 002 003 V (m³) > Fig. (Q1) P (MPa)►FLUID MECH Support your answer with the appropriate solution and diagram. 5. Air at 2.50 kg/m^3 enters a nozzle that has an inlet to exit ratio of 2:1 with a velocity of 120 m/s and leaves with a velocity of 330 m/s. Determine the density of air in kg/m^3 at the exit. A. 1.02 B. 1.82 C. 2.78 D. 4.02Q3/Answer by true or false : 1) All water systems using fan coil units are suitable in buildings requiring individual room control and consume less space compared to all air systems. 2) All air conditioning systems make use of an economizer. 3) With 100 % re-circulated air, some time, the room ADP is equal to coil ADP and the load on the coil is equal to the load on the room. 4) The sensible load affects dry bulb temperature, while the latent load affects the moisture content of the conditioned space. 5) A single zone, single duct, constant volume system can be used either for cooling or for heating, but not for both cooling and heating simultaneously.