f. A water-jacketed compressor receives 140 L/s air at 100 kPa and 21 deg C and discharges the air at 140 deg C. Cooling water entering at 16 deg C and leaving at 21 deg C is circulated at the rate of 0.18 L/s. Determine the power required for the driving motor for this compressor, assuming the friction losses with rotating parts account to 5% of the total power required. a. 10 kW b. 15 kW c. 20 kW d. 25 kW

f. A water-jacketed compressor receives 140 L/s air at 100 kPa and 21 deg C and discharges the air at 140 deg C. Cooling water entering at 16 deg C and leaving at 21 deg C is circulated at the rate of 0.18 L/s. Determine the power required for the driving motor for this compressor, assuming the friction losses with rotating parts account to 5% of the total power required. a. 10 kW b. 15 kW c. 20 kW d. 25 kW

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

See similar textbooks

Similar questions

8. A turbine passes 67.5 kg/h of steam at 200 km/h at 8 MPa and leaves at 0.5 MPa as wet steam with a speed of 90 km/h and a specific volume of 0.189 m3/kg. d. What must be the steam input conditions (T,H) to turn on a device that consumes 30 kW? and. What is the mass and volumetric flow rate of the water at the outlet? F. What is the input and output area?
1. The mean effective pressure of an engine running at 300 rpm is 500 kPa. What is the indicatedpower if the engine has bore of 250 mm x 450 mm. Select the correct answer below: A. 110.5 kW B. 150 kW C. 200 kW D. 182. 2 kW 2. In a certain process, entering is 1500 KJ/kg and 150 m/s. If the energy leaving is 12000 Kj/kg/ Determine the velocity at exit. Select the correct answer below: A.) 145 m/s B. 1020 m/s C. 789 m/s D. 978 m/s
Pls. Answer this thank you!Steam enters a turbine stage with an enthalpy of 3628 kj/kg at 70 m/s and leaves the same stage with an enthalpy of 2846 kj/kg and a velocity of 124 m/s. Calculate the power in KW if there are 5 kg/s steam admitted at the turbine throttle.
Air enters an adiabatic compressor at 100 kPa and 17 C and leaves at 600 kPa and 211 C. The mass flow rate is 5 kg/min. Assume the specific heat is constant with Cp = 1.005 kJ/kgK and Cy = 0.718 kJ/kgK. In the question that follows, select the answer that is closest to the true value. What is the power input to the compressor in units of kW? 16.25 32.25 5.20 10.40
5.0 A 140 x 140-mm, twin-cylinder, single acting refrigerant- 12 compressor running at 600 rpm carries a refrigeration capacity of 40 kW while operating at 350 kPa suction and 1300 kPa discharge pressures. , Assuming the same load to be carried with the same volumetric efficiency and if the discharge pressure shall be raised to 1400 kPa, a) what is the percent increase in mass of R-12 (b)What will be the new volumetric displacement of the compressor the compressor be run? in m/sec ?;(c)At what speed should
2. A reciprocating compressor draws in 500 cubic feet per minute of air whose density is 0.079ft/cu. ft and discharges it with a density of 0.304 lb/cu. ft. At the suction, P 1 = 15 Psia; atdischarge, P 2 = 80 psia. The increase in the specific internal energy is 33.8 BTU/lb and the heattransferred from the air by cooling is 13Btu/lb. Determine the work on the air in BTU/min and inhp. Neglect kinetic energy. 3 decimal in final answer pls
Air with a pressure of 0.1 MPa and a temperature of 25oC with a flow rate of 5.29 kg/minute enters a three-stage reciprocating piston compressor with intercooler. The air is compressed polytropically (n = 1.3) to reach the pressure of 4 MPa. Calculate: a) The amount of heat transferred to each intercooler? b) How much air is needed for cooling in the intercooler if the allowable maximum temperature changes between the inlet and outlet of the intercooler is 8oC?
Question 2 A two stage, single acting, reciprocating compressor takes in air at a rate of 2 m³/s at a pressure of 1 MPa @ 16°C. The air is compressed to 0.7 MPa while running at 10 rev/s. Compression is ideal and perfect intercooling takes place. The compression process follows pV1.25 = C. Neglect clearance. Calculate: 2.1. Intermediate pressure (0.265 MPa) 2.2. Volume of LP cylinder (20 Liters) 2.3. Volume of HP cylinder (7.5 Liters) 2.4. Total cycle power (42 kW)
Prove that the given answers are right or prove that the answers are wrong.
10. A centrifugal pump operating under steady-flow conditions 2.28 m/min of water with a specific volume of 0.001 m³/kg from an initial pressure of 84 kPa to a final pressure of 280 kPa. The diameter of the suction inlet to the pump is 15 cm and the diameter of the discharge outlet is 10 cm. If the suction and discharge lines are at the same level, and no change in internal energy, determine the work (hp) done on the water by the pump. Ans. 10.46 hp 3
10. High pressure steam enters a turbine with a velocity of 38 meters/sec and leaves the exhaust trunk with a velocity of 305 meters/sec. Calculate the kinetic energy of the steam at the exhaust trunk in N-m/kg.
Answer 1.8 and 1.9