QUESTION 3 The refrigeration plant onboard a fishing vessel maintain minus 20 °C in a fish storage hatch at a design ambient air temperature of 33 "C. The plant which rejects condenser heat to sea water at +22°C operates at evaporating and condensing temperatures of minus 20 °C and 30 °c respectively. It is fitted with a 4- cylinder R134a compressor having a bore of 100 mm, stroke 150 mm and speed 1500 rpm. Given that the suction gas superheat is 10 °C, condensate sub cooling is 10°C, volumetric efficiency of compressor is 80 % and discharge gas temperature 65°C, determine the following: (a) Power consumption. (b) Isentropic efficiency. (c) Cooling capacity. (d) Carnot efficiency of the plant.

QUESTION 3 The refrigeration plant onboard a fishing vessel maintain minus 20 °C in a fish storage hatch at a design ambient air temperature of 33 "C. The plant which rejects condenser heat to sea water at +22°C operates at evaporating and condensing temperatures of minus 20 °C and 30 °c respectively. It is fitted with a 4- cylinder R134a compressor having a bore of 100 mm, stroke 150 mm and speed 1500 rpm. Given that the suction gas superheat is 10 °C, condensate sub cooling is 10°C, volumetric efficiency of compressor is 80 % and discharge gas temperature 65°C, determine the following: (a) Power consumption. (b) Isentropic efficiency. (c) Cooling capacity. (d) Carnot efficiency of the plant.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A single 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 produce 700 kW of refrigeration at -18°C evaporating temperature. At this temperature the cooling effect per kg mass is 1160 kJ. The specific volume of vapor entering the compressor is 0.592 m³ per kilogram. Assume 85% volumetric efficiency, determine the bore in mm.
Q2. A four-stroke cycle SI engine with 8 cylinder has 6.2-liters. It designed to have a maximum mass flow rate of 0.349 kg/sec. The engine is equipped with a four-barrel carburetor, each barrel having a discharge coefficient of CD = 0.95. The tube discharge coefficient CDc= 0.85 and the capillary tube height differential is Icm. The fuel used is gasoline at FA = 1:15 ,density of gasoline is 750 kg/m'. Calculate the Fuel capillary tube diamețer needed for each venturi throat. %3D
6.2 Catalogue data of 4.8% clearance R 134a compressor with piston displacement of 2 m/min shows the capacity to be 12.7 TR with a bhp of 13.5 when the suction conditions are 18°C & 3.19 bar and the condensing temperature is 35°C. The refrigerant leaves the condenser as saturated liquid. Calculate the actual and clearance volumetric and adiabatic compression efficiencies of the compressor at these conditions
A single reciprocation compressor takes 1m³ of air per minute and 1.013 bar and 15 degree Celsius and delivers at 7 bar. Assuming Adiabatic law(n=1.35) and no clearance. This same compressor is now driven at 300 rpm, has a stroke bore ration of (1.5:1), it has a mechanical efficiency for the compressor of 85% and motor transmission efficiency of 90%. Calculate: Volume per cycle Cylinder bore diameter Power to the compressor Motor power needed The isothermal power The isothermal efficiency
A 140 mm x 140 mm single effect , twin -cylinder , single acting Freon 12 compressorwith a refrigeration capacity of 40 Kw operates between a discharge pressure of 1300 KPa and asuction pressure of 350 KPa . The speed of the compressor is 600 rpm . If the discharge pressureshall be raised to 1400 KPa , at what speed (rpm) should the compressor be run to produce thesame refrigeration capacity and assuming the volumetric efficiency to remain the same ?A) 613 C) 630B) 621 D) 650
An ammonia ice plant operates on simple saturation cycle at the following temperatures. Condensing temperature 40°C Evaporating temperature -15°C It produces 10 tons of ice per day at -5°C from water at 30°C. Determine: (a) Capacity of the refrigeration plant. (b) Mass flow rate of refrigerant. (c) Isentropic discharge temperature. (d) Compressor dimensions (bore and stroke) if its volumetric efficiency is assumed as 65%. The compressor is to run at 1400 rpm. Take stroke/ bore ratio (L/D) as 1.2. (e) Horsepower of the compressor if its adiabatic efficiency is taken as 85% and mechanical efficiency as 95%. (f) Theoretical and actual COP.
vapour compression refrigerator operates between the pressure limits of 462.4 kN/m² and 1785.9 kN/m². At entry to compressor the refrigerant is dry saturated and after compression it has a temperature of 59°C. The compressor has boreand stroke of 75 mm and runs at 8 rev/sec. With volumetric efficiency of 30% The temperature of the liq. refrigerant as it leaves the condenser is 32°C and specific heat capacity of the super heated vapour may be assumed constant. Determine (1) The coefficiency of performance of refrigerator. (1) The mass flow of the refrigerant in kg/hr.
Exampie Air conditioning unit uses Freon R-22 for conditioned office at 25 C. The evaporating temperature is 17 C and the condensing temperature is 47 C. The compressor is reciprocating and single acting with number of cylinders of 4, volumetric efficiency of 0.9, number of revolution is 900 rpm cylinder dimensions of L/D is 1.25. If the compressor power is 3 kW and mechanical efficiency of 0.9, estimate the followings: the refrigerant mass flow rate in kg/min, refrigeration capacity in TR, cylinder dimensions, condenser heat load, coefficient of performance and relative efficiency. and
A plant located at an altitude of 925 m has an open feedwater heater located 2.76 m above the pump intake. The water in the heater has a temperature of 65ºC. If the head loss in the suction line is 0.8 m. Determine: a. Atmospheric pressure head, in meter b. Vapor/saturation pressure head, in meter c. The Net Positive Suction Head.
The manager has been asked an engineer to propose a solution related to the air compressor. The air compressor is required to deliver air at 20 bar. The engineer has decided to use a single-stage with double-acting compressor with stroke to bore ratio of 1.2/1 and the clearance volume is 5% of the swept volume. The swept volume is 0.0003 m3. The compressor operates at 1400 rpm in free air condition of 1.02 bar and 24℃. Due to valve opening and heated cylinder wall, the actual induction conditions are 1.0 bar and 35℃. With the given index compression-expansion of 1.3 and specific gas constant R = 0.287 kJ/kg-K, you are required to help the engineer in solving the following issues:i. Sketch the related pressure-volume (p-V) diagram with appropriate label.ii. Calculate the volume induced per cycle, [m3].iii. Calculate the free air delivery (FAD), [m3/min]iv. Determine the indicated power, [kW]v. Calculate the volumetric efficiency, [%]
A refrigerant 12 refrigeration system requires a load of 54 kW at an evaporator pressure of 270 kPa and a condenser pressure of 1009 kPa. The refrigerant is subcooled 10 degrees before entering the expansion valve and vapor is superheated 14 degrees before entering the compressor A twin-cylinder compressor with stroke equal to 1.25 times the bore is to be used at a speed of 27 r/s The volumetric efficiency is 84 per cent. Determine (a) the quantity of cooling water in the condenser for an 11-degree increase in temperature, (b) the bore and stroke, and (c) the compressor power. Ans (a) 1.40 kg/s, (b) 8.58 x 10.73 cm, (e) 10.5 kW
8.3 A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point ofthe product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect,2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of a spreadsheet for solving the example problem no. 8.2 and 8.3