Beiler Py000 P "punpin' Pumpl Turbine Condenser Figure 2 (b) Determine the themal efficiency of the cycle in part (a) when the liquid enters the pump 1.3°C cooler than a saturated liquid at the condenser pressure.
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- Condensers in these refrigerators are all_______cooled.Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______, andCondenser a steam power plant that operates on a simple ideal ranking cycle and has a net power output of 22MW. Steam enters the turbine at 7Mpa and 450.05°C and is cooled in the condenser at a pressure of 10kpa by running cooling water from a lake through the tubes of the condenser at rate of 1750 kg/s. Determine the mess flow rates of steam through the steam turbine assuming that the cp of superheated steam is 2.9593kJ/kg.K.
- A Freon 12 vapour compression system operating at a condenser temperature of 45Co and an evaporator temperature of 0Co develops 20 tons of refrigeration. Using the p-h diagram for Freon 12, determine; (15) a) The mass flow rate of the refrigerant circulated. b) The heat rejected in the condenser, and c) The Carnot COP and the actual COP of the cycle.Consider a cogeneration systemoperating as shown on the right Steamenters the first turbine stage at 6 MPa,540°C. Between the first and secondstages, 45% of the steam is extracted at 500kPa and diverted to a process heating loadof 5 × 108 kJ/h. Condensate exits theprocess heat exchanger at 450 kPa withspecific enthalpy of 589.13 kJ/kg and ismixed with liquid exiting the lower-pressure pump at 450 kPa. The entire flowis then pumped to the steam generatorpressure. At the inlet to the steam generatorthe specific enthalpy is 469.91 kJ/kg.Saturated liquid at 60 kPa leaves thecondenser. The turbine stages and thepumps operate with isentropic efficienciesof 82% and 88%, respectively. Determinea) the mass flow rate of steam entering the first turbine stage, in kg/s.b) the net power developed by the cycle, in MW.c) the rate of entropy production in the turbine, in kW/K.a steam 8.0 MPa and 485 degree Celsius enters the turbine and expand at condenser pressure of 0.006 mpa for cycle and 1kg of steam. determine A.) heat added, B.) Wnet, C.) Thermal Efficiency. And for the engine, Determine the steam flow and the energy output of 40,000 Kw, E.) Wturbine, F.) Energy Chargable, G.) Ideal Heat rate
- 1. Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of45 MW. Steam enters the turbine at 7 MPa and 500°C and iscooled in the condenser at a pressure of 10 kPa by runningcooling water from a lake through the tubes of the condenserat a rate of 2000 kg/s. Show the cycle on a T-s diagram withrespect to saturation lines, and determine (a) the thermal efficiency of the cycle, (b) the mass flow rate of the steam, and(c) the temperature rise of the cooling water. Answers:(a) 38.9 percent, (b) 36 kg/s, (c) 8.4°C 2. Consider a 210-MW steam power plant that operateson a simple ideal Rankine cycle. Steam enters the turbine at10 MPa and 500°C and is cooled in the condenser at a pressure of 10 kPa. Show the cycle on a T-s diagram with respectto saturation lines, and determine (a) the quality of the steamat the turbine exit, (b) the thermal efficiency of the cycle,and (c) the mass flow rate of the steam. Answers: (a) 0.793,(b) 40.2 percent, (c) 165…Considering a Rankine cycle: Why is it important to condense at leastuntil liquid saturated the fluid in the condenser?A simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of-5C and a condensing temperature of 40℃.For refrigerating capacity of 30 kw, determine the work of the compressor. At 40°℃,hf=238.5 kJ/kg;at-5C,hg =349.3 kJ/kg,.Enthalpy entrance to the condenser is 372 kJ/kg.
- 1. Discuss the effect of decreasing the condenser pressure, increasing the boiler pressure and increasing the maximum temperature in the basic Rankine cycle on the overall thermal efficiency, while showing the different variations in the T-S diagram (Hint: show how the Wnetwill be affected)A simple vapor - compression cycle develops 13 tons ofrefrigeration. Using ammonia as refrigerant and operating at acondensing temperature of 24 °C and evaporating temperature of-18°C and assuming that the compression are isentropic and thatthe gas leaving the condenser is saturated. Find the followinga). Draw the p-h diagramb.) Refrigerating effect in kJ/kgc.) Circulation flow in kg/mind.) Power requiremente.) Volume flow in cubic meter per minute per tonf.) Coefficient of performanceg.) Power per tonA four-cylinder, 8 cm x 10 cm, single acting, V-type compressor operates at 600 rpm. Iti s used in a Freon-12 vapor compression system with condenser and evaporatort emperatures of 29OC and -14OC, respectively. If the compression is dry and isentropic,the clearance is 2 percent. (a) Draw the cycle schematic diagram and (b) draw the corresponding p-h diagram and determine (c) the refrigerating capacity in tons, (d) the heat given off in the condenser, and (e) the COP. The gas constant, k for R-12 is 1.126.