Letter C and D only (5) Asingle-acting, twin-cylinder 15.25 x 15.25-cm. compressorreceives saturated ammonia vapor at -18°C and discharges it at1514.3 kPa. The system is used to produce ice at a final temperatureof -10°C from water at 27°C. The compressor runs at 450 rpm withan actual volumetric efficiency of 78%. Assume compression andmechanical efficiencies to be 82% and 88%, respectively. Calculatethe following: (a) capacity of the system in tons of refrigeration, (b)brake hp required by the compressor, (c) tons of ice produced perday if compressor runs only 20 hours a day. Assume losses to be10% of the refrigeration required to produce the ice, and (d) idealand actual COP.

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Answered: (5) Asingle-acting, twin-cylinder 15.25…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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7. In a refrigeration plant ammonia enters the expansion valve as a liquid at 32°C and leaves the evaporator as a dry saturated vapour. The pressure limits are 158.8kPa and 1389kPa. The compression may be assumed to be isentropic. The single acting compressor of 130mm bore, 150mm stroke, and 90% mechanical efficiency runs at a rotational speed of 240rpm. Calculate: (a). refrigerant volumetric flowrate (b). cooling load (c). power input to the compressor
an ideal single stage compressor without clearance take sin air at 100 kpa. with temperature of 16 C and delivered it at 413 kpa after isentropic compression, what is the work done by the compressor.
Please ?
A four stage single acting air compressor running in an atmospheric at 87 KPa and 15 degrees Celsius has a free air delivery of 2,83 m³/min. The section pressure and temperature are 80 KPa and 32 degrees Celsius respectively, the delivery pressure is to be 7 MPa. The temperature at the start of compression in each stage is 32 degrees Celsius, take n=1,3 for all stages. Calculate 1.the mass flow rate to 3 decimal place in kg/min 2. The power input in KW to 1 decimal place
REFERENCE: FROM BOOK - ENGINEERING THERMOFLUIDS, M. MASSOUD
A trubo-charge, 16 cylinder, vee-type diesel engine has an air comsumpyion of 3000 kg/hr per cylinder at rate load and speed. this air is drawn in through a filter by a centrifugal compressor directly connected to the exhaust gas turbine. the temperature of the air from the compressor to 145 C and a counter flow air cooler reduced the air temperature to 45 C. before it goes to the engine suction header. cooling water enters air at 30 C and leaves at 38 C. calculate the quantity of the cooling water in m/hr required to cool the total air requirement of the engine at rate load and speed. ( hint: use AMTD)
3. A single stage air compressor hadles 0.454 m^3/sec of atmospheric pressure, 27 deg. C air, and delivers it to a receiver at 652.75kPa. Compression is isothermal. Determine the work in kW
A new air turbine is required for a dentist's drill. For the drill bit to be effectively abrade tooth enamel the turbine be rotate at high speed of 400000rpm. The turbine design must be small and flexible according to precision engineering so that all parts of the patient's mouth can be access and the exit air flow rate from the system is 14 L/min is needed for proper operation. The operating pressure and temperature to drive the turbine is 5 bar and 400 K. Calculate: 2.1 The specific speed of the turbine and use the specific speed from the turbine and determine the type of turbo machinery required by the system. 2.2 Determine the power used by the turbine during operation and account how this power is used during operation.
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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 LMTD
Provide the evidence of describing how the reciprocating air compressors (applicable to a particular purpose) may be used to save energy cost and still prevent disadvantages on other
: Determine the total turbine power output ? in the adiabatic turbine receives the water at (15000 kPa), (873 K) for mass flow rate of (100 kg/s), In the midst part (20 kg/s) is withdrawn at (2 MPa), (350°C), and the rest outlets the turbine at pressure (75 kPa), and (95 percent )quality.Neglecting the changes in kinetic energy,

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