) 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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- 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.(a) What would be the necessary bore and stroke of a single acting four- cylinder, 350 rpm ammonia compressor working on simple saturation cycle between 35°C condenser and -15°C evaporator temperatures and developing 15 tons refrigeration. Given for the compressor: Ratio of stroke to bore = 1 Volumetric efficiency = 0.7 (b) If the index of compression is 1.15, find the error introduced in calculat- ing the work of compression by assuming the process to be isentropic. Also, find the heat rejected to the compressor-jacket cooling water.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
- 3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenser pressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is to used at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanical efficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch the p-h diagram labeling the evaporating and condensing temperature and pressures (b) define the all properties of ammonia taken from saturation table. Determine (c) the quantity of cooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the bore and stroke expressed in cm and (e) the size of the driving motor in hp. Given: h2 = h at 1557 kPa and s2 = s1 1695 kJ/kg6.2 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 conditionsExampie 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
- Title A simple, constant pressure gas turbine is designed for a pressure ratio of 5 to 1, and a turbine... Description A simple, constant pressure gas turbine is designed for a pressure ratio of 5 to 1, and a turbine inlet temperature of 550°C. The adiabatic efficiency of compressing is 80% and that of expansion 85%, and there is a pressure loss of 0.0343bar through the combustion chamber. Calculate (a) the power per kg of air per sec. (b) the overall efficiency. Assuming the air to enter at 15°C and 1.01 bar. Take k = 1.4 and Cn = 1.047 for both air and combustion gases. Neglect the additional mass flow due to the fuelProblem (5.3) The outlet angles of the nozzle and blades of a two-row impulse turbine are in succession 16°, 18°, 20° and 30° and the corresponding nozzle and blade velocity coefficients are 0.92, 0.72, 0.78 and 0.84. The flow through the nozzle is at the rate of 4 kg/s, and the supply is at 1.2 MPa and 50°C superheat. The chamber pressure is 0.5 MPa and the blade speed is 1/5 that of the jet speed leaving the nozzle. Determine the work done and the blade efficiency.Problem (5.3) The outlet angles of the nozzle and blades of a two-row impulse turbine are in succession 16°, 18°, 20° and 30° and the corresponding nozzle and blade velocity coefficients are 0.92, 0.72, 0.78 and 0.84. The flow through the nozzle is at the rate of 4 kg/s, and the supply is at 1.2 MPa and 50°C superheat. The chamber pressure is 0.5 MPa and the blade speed is 1/5 that of the jet speed leaving the nozzle. Determine the work done and the blade efficiency. Ans. [391.67 kW, 61.13 %]
- A process in a plant is to he revised such that the airflow rate through Si system will increase from 8000 cfm to 10,000 cfm, The existing fan runs at 1600 rpm and provides 6,0 in, H2O SP. Estimate the new speed required for this fan and the new SP.11. 30 tonnes of ice from and at 0°C is produced in a day of 24 hours by an ammonia refrigerator. The temperature range in the compressor is from 298 K to 258 K. The vapour is dry saturated at the end of compression and expansion valve is used. Assume a co-efficient of performance of 60% of the theoretical and calculate the power in kW required to drive the compressor. Latent heat of ice is 334.72 kJ/kg. Enthalpy Entropy of liquid Entropy of vapour kJ/kg Тетр. K kJ/ kg kJ/ kg K Liquid Vapour 298 100.04 1319.22 0.3473 4.4852 258 -54.56 1304.99 - 2.1338 5.0585 [Ans. 21.59 kW]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.