) A singe acting, twin cylinder, ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to generate 700 kW of refrigeration at -18C evaporating temperature. At this temperature, the cooling effect per kg mass is 1160 kJ. The sp volume of vapor entering the compressor is 0.592 m³/kg. Assume 85% volumetric efficiency. Calculate the bore in mm
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1) A singe acting, twin cylinder, ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to generate 700 kW of refrigeration at -18C evaporating temperature. At this temperature, the cooling effect per kg mass is 1160 kJ. The sp volume of vapor entering the compressor is 0.592 m³/kg. Assume 85% volumetric efficiency. Calculate the bore in mm.
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- Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______, andAn air standard gas turbine engine operates on an overall pressure ratio of 4 and between the temperature limits of 70 F and 1600 F. The efficiencies of compressor and turbine are 0.82 and 0.92, respectively. To modify, a regenerator of effectiveness 0.65 is added and two stage of compressor with intercooler is inserted and two-stage turbine with reheater is inserted. (a) Assuming constant specific heats, evaluate the compressor work (b) calculate the turbine work (c) calculate the thermal efficiencies Show complete solution on a paper.A 1200 kW water-cooled chiller has a centrifugal compressor with refrigerant R134a as the working fluid. The compressor runs at 9600 rev/min and has a slip factor of 0.95 and an overall isentropic efficiency of 90%. The impeller tip speed is not to exceed 160m/s. The evaporating and condensing temperatures are 2°C and 40°C respectively. Assuming that there is no superheating and sub-cooling, a) sketch the refrigration cycle on a P-h diagram (please indicate the pressures and specific enthalpies of all points in the cycle); b) determine the mass flow rate of the refrigerant R134a; c) determine the coefficient of performance of the chilled water plant; and discuss the possible measures to uplift the plant COP d) determine the number of stages and the impeller tip diameters, assuming that all stages would share same work input and each stage compression would have the same impeller tip diameter. e) Please also comment how the slip factor can affect the energy performance of the…
- A mining pit about 5000ft below sea level was flooding as a result of heavy down pour. The situation is such that if quick and drastic measures are not taken severe damage could be cause to lives and properties. As the pit superintendent (mining engineer) a) What kind of pump is suitable for this kind of operation and why? In a power plant, the steam from the boiler reaches the turbines at a temperature of 700oC. The spent steam leaves the turbine at 100oC. b) Calculate the maximum efficiency of the turbine As the project consultant for Green court engineering consults, you have been contracted by Total power development authority to present a detailed proposal on an intended project to explore an additional generation units to increase capacity. (c) In your capacity as the project engineer, why is the project necessary?Air Is To Be Compressed In A Single-Stage Reciprocating Compressor From 1.013 bar And 15°C To 7 bar.For A Free Air Delivery Of 0.3 meter cubed per min.The Compressor Is To Run At 1000 rev/min.If The Compressor Is Single-Acting And Has A Stroke/Bore Ratio Of 1.2/1, Calculate The Bore Size Required.5. A single-acting, twin-cylinder 15.25 x 15.25-cm compressor receives saturated ammonia vapor at - 18 degrees * C and discharges it at 1514.3 kPa. The system is used to produce ice at a final temperature of - 10 degrees * C from water at 27 degrees * C . The compressor runs at 450 rpm with an actual volumetric efficiency of 78%. Assume compression and mechanical efficiencies to be 82% and 88%, respectively. Calculate the following: (a) capacity of the system in tons of refrigeration, (b) brake hp required by the compressor, (c) tons of ice produced per day if compressor runs only 20 hours a day. Assume losses to be 10% of the refrigeration required to produce the ice, and (d) ideal and actual COP.
- please provide fast answer Steam issues from the nozzle of a single-impulse turbine at 800 m/sec on to blades moving at 300 m/sec. The blade tip angles at inlet and outlet are 36º each. The steam is to enter the blades without shock and the flow over the blades is frictionless. Determine— (a) the angle at which the nozzles are inclined to the motion of the blades; (b) diagram efficiency.a turbo-charge 16 cylinder, vee diesel engine has an air consumption of 3000 kg/hr per cylinder at rated load and speed. this air is drawn in through afliter by a centrifugal compressor diresctly connected to the exhaust gas turbine. the temperature of the air from the compressor is 147 C and a counter flow cooler reduces the air temperature to 43 C before it goes to the engine suction header. cooling water enters air cooler at 31 C and leaves at 40 C. calculate the LMTDi . A gas well is flowing at a flow rate of 1.2x105scf/d with the surface pressure of 500psi and compressor inlet pressure of 100psi. Calculate the horse power requirement.
- 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 pressure at stage-2 and stage-3 so that the compression work is minimum? b) The compression work in each stage and the total compression work? c) The outlet air temperature from each stage's cylinder? d) The amount of heat transferred to each intercooler? e) 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?The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 1 kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa. Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: Ideal turbine work (KW). Ans.____________________________ Heat rejected at condenser (KJ/sec). Ans.____________________________ Mass of cooling water in kg/sec if cp H2O = 4.18 KJ/kg-K, and inlet temp of water to condenser = 20 deg C, outlet temp is 35 deg C. Ans.____________________________ Pump work in KW. Ans.___________________________A single row impulse turbine develops 132.4 kW at a blade speed of 175 m/s, using 2 kg of steam per sec. Steam leaves the nozzle at 400 m/s. Velocity coefficient of the blades is 0.9. Steam leaves the turbine blades axially. Determine nozzle angle, blade angles at entry and exit, assuming no shock.