A distillation column with a total of 13 actual stages (including a partial condenser) is used to perform a separation which requires 7 ideal stages. Calculate the overall column efficiency, and report your answer in %
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A distillation column with a total of 13 actual stages (including a partial condenser) is used to perform a separation which requires 7 ideal stages. Calculate the overall column efficiency, and report your answer in %
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- A two-stage R-22 system uses flash-gas remoal and intercooling as in the previous problem. The evaporating temperature is -40 C and the condensing temperature is 30 C. The pumping capacity of the high and low stage compressors is shown below: (from picture solve a and b)A Rankine cycle is executed with steam expanding initially from 20 MPaa and 100 deg SH. Condensation occurs at 399.967 millibars vac. All expansion and compression efficiencies are 90 %. Sketch the equipment layout and the TS diagram. Answer the following for (m = 10 + (SN/5) ) kg/sec of steam circulated and fill up the blanks in the items below: 1. TS diagram with the cycle showing correct location of points with respect to saturation dome line with ne and nc = 90%. 2. Actual heat rate in KJ/KW-hr Answer: _______________________ 3. Heat rejected at the condenser in KW (Ideal) Answer: _____________________ 4. Ideal Rankine engine efficiency % Answer: _______________________ 5. Ideal Rankine cycle efficiency % Answer: _______________________ 6. Actual Rankine cycle efficiency using pump and turbine work % Answer: _______________ 7. Actual Rankine cycle efficiency using Qa and Qr values % Answer: _______________ 8. If the generator efficiency = 95%, brake engine efficiency = 90% what is…1. Consider the scheme shown in the figure T, = 200°C for producing fresh water from salt water. The conditions are as shown in the figure. Assume that the properties of salt water are the same as those of pure water. The outer walls of heat exchanger, Heatem flash evaporator and pump can be considered as thermally insulated. The pressure drop of a continuous stream across the heat exchanger and heater are negligible. exc (ins a) Determine the ratio ("7/m.), which gives the mass fraction of salt water purified. 2 = 70 b) Determine the specific pump work, in kJ per kg of T2= liquid seawater. Liquid seawater in c) Determine the specific heat input for the heater, in kJ per kg of liquid seawater. d) Determine the specific entropy production for the flash evaporator and the heater, in kJ/K per kg of liquid seawater.
- Steam is generated at 4.10 Mpa and 440°C and condensation occurs at 0.105 MPa a. For a Rankine engine operating between these limits, computethe thermal efficiency and the heat rate b. Considering that a Rankine cycle occurs between same limits, determine QA, QR, Wnet and eth c. What mass flow rate is required for a net output of 30 000 kW Don't answer the given problem, just give me the schematic diagram and t-s diagram of the given problem3.) 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/kgSteam is to be condensed by direct injection of cold water. The steam enters the condenser at the rate of (450 kg/hr) with dryness fraction of (0.9) and pressure (1 bar). The estimated heat losses from the condenser to the surroundings is (8500 kJ/hr). If cold water enters at (15"C) and the mixture of condensate and cooling water is to leave at (95"C). Determine the required flow of cooling water.
- Please show the coimplete solution. (Example: Conversion of Units) In an ammonia condensing machine (Compressor Plus Condenser) the water used for condensing is 55°F and the evaporator is at 15°F. Calculate the ideal COP.SAMPLE PROBLEMS: (1) Steam is generated at 4.10 MPa and 440°C and condensation occurs at 0.105 MPa. (A) For a Rankine engine operating between these limits, compute the thermal efficiency and the heat rate. (B) Considering that a Rankine cycle occurs between the same limits, determine QA, QR, Wnet and en (C) what mass Flow Rate is required for a net output of 30,000 kW?The condensing pressure for a Rankine engine is 0.001325 MPavac. Calculate the following for steam flow rate = 1 + (200/13) 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: PV and TS diagrams of the cycle showing ideal and actual process lines 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.____________________________ Rankine engine efficiency (%). Ans.____________________________ Cycle thermal efficiency ( %). Ans.____________________________
- Air is cooled and dehumidified at constant pressure as shown in the figure below. Heat removed by the cooling coil is 130kW. Find air mass flow rate, air volumetric flow rate, condensation flow rate and sketch al states in a psychrometric diagram . Use AirH20 as the working fluid PLEASE NOTE: T2 has a typo, it should be 16.7 degrees Centigrade, not 16.7 degrees Fahrenheit, and all temperatures should be in CentigradeCould you please help with these questions, i understand there is more than one question so plese feel free to take more credits or advice on how to do so, Thanks in advance5. A vapour compression refrigeration plant using R12 has saturation temperatures in the evaporator and condenser of -20°C and 35°C respectively. The R12 leaving the condenser is undercooled by 5°C and leaving the evaporator it is superheated by 15°C. The R12 circulates at 10kg/m. Calculate: (a). the dryness fraction of the R12 at the evaporator inlet (b). the cooling load in kW (c). the rate of work done on the R12 in the compressor (d). the plant capacity