(a) Sketch the cycle on a 7-s diagram being sure to label the state points and indicate the relative location of the liquid-vapor dome. (b) Determine the efficiency of the cycle, (c) the quality at the end of the heat addition process, and the quality at the end of the heat rejection process.
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- Condenser 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.An ammonia ice plant operates between a condenser temperature of 35°C and evaporator of -15°C. It produces 10 metric tons of ice per day from water at 30°C to ice at -5°C. Assuming simple saturation cycle, determine the horsepower of the motor if the adiabatic efficiency of the compressor nc = 0.85 and mechanical efficiency nm = 0.95. The specific heat of ice is 2.094 kJ/kg-°C and the latent heat is 335 kJ/kg. From the table for ammonia the following enthalpies are: condenser entrance = 1703 kJ/kg, exit = 366.1 kJ/kg; compressor entrance = 1443.9 kJ/kg, exit = 1703 kJ/kg.In refrigeration process, a region is cooled and the temperature was maintained at -15oC. The cooling water used in the refrigeration is 25oC. If the refrigerant is HFC-134a, and the heat transfer temperature difference is 10oC, Calculate COP (ω) and mass flowrate for a vapor-compression cycle if the rating of the refrigeration process is 100,000 kJ/h and the efficiency of the compression is 0.75.
- An ammonia ice plant operates between a condenser temperature of 35oC andevaporator of –15oC. It produces 10 metric tons of ice per day from water at 30oCto ice at –5oC. Assuming simple saturation cycle, determine the horsepower ofthe motor if the adiabatic efficiency of the compressor ηc = 0.80 and mechanicalefficiency ηm = 0.90. The specific heat of ice is 2.094 kJ/kg.oC and the latent heatis 335 kJ/kg. From the table for ammonia the following enthalpies are: condenserentrance = 1703 kJ/kg, exit = 366.1 kJ/kg; compressor entrance = 1443.9 kJ/kg,exit = 1703 kJ/kg A. 14.55 hp B. 24.55 hp C. 34.55 hp D. 44.55 hp: A two stage steam turbine with one re-heater works under a boiler pressure of 15 MPa and re-heater pressure of 7 MPa. The steam temperature at the outlet of boiler is 400°C and at the outlet of re-heater is 350°C. The net power developed by the plant is 13995 kW. Determine mass flow rate of water supplied to the boiler, if the pump consumes 14.9 kJ/kg. Also find the ratio of heat supplied at the re-heater to the boiler.A Carnot refrigeration cycle is executed in a closed system in the saturated liquid–vapor mixture region using 0.8 kg of refrigerant-134a as the working fluid (Fig. 6–51). The maximum and the minimum temperatures in the cycle are 20 and –8°C, respectively. It is known that the refrigerant is saturated liquid at the end of the heat rejection process, and the net work input to the cycle is 15 kJ. Determine the fraction of the mass of the refrigerant that vaporizes during the heat addition process and the pressure at the end of the heat rejection process.
- The compressor of a refrigerator using refrigerant R134a draws 1.2 kW. Since the evaporation temperature in the evaporator is -22 °C and the condensation temperature in the condenser is 38 °C; (a) Plot this refrigerator system schematically with its elements and show it on the T-s and P-h diagram of the refrigeration cycle (b) The cooling power of the refrigerator (c) The amount of heat the refrigerator gives to the environment (d) Calculate the ideal and Carnot COP cooling values of this refrigerator.A refrigerator uses R-134a as its working fluid and operates on an ideal vapor- compression refrigeration cycle that uses an expansion valve (throttling device). The refrigerant evaporates at -20°C and condenses at 1.4 MPa. This unit serves a 15-kW cooling capacity. Determine the mass flow rate of the refrigerant, in kg/s.A 540,000 kJ/h capacity refrigeration system using Refrigerant 22 and served by a single compressor unit operates at an evaporator temperature of -23 oC and a condensing saturation temperature 40oC. To get rid of the single compressor load, a modification is proposed to use two stage of compression with refrigerant intercooling. (a) Determine the power required in the original system. (b) Determind the power required for the proposed modified system.
- An ammonia vapor refrigeration cycle operates at an evaporator temperature of -16°C and a condensing temperature of 32°C. Determine the coefficient of performance for wet compression with superheated vapor leaving the compressor. The quality of vapor entering the compressor is 0.975 and the specific entropy of the superheated vapor discharging from the compressor is 5.7 kJ/kg-K.mr-pant quest an ar IS SU you part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.35 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. The compressor consumes 3.3 kW of power. Use data from the tables. 26°C 1.2 MPa 5°C subcooled Expansion valve Condenser Evaporator OL Water 18°C 1.2 MPa 50°C Compressor Determine the COP of the refrigerator. The COP of the refrigerator is (You must provide an answer before moving to the next part.)A vapor compression refrigeration cycle operates at steady flow conditions with 0.25kg/s or R-134a. The table below shows some of the operating parameters andproperties for the refrigerant. The compressor is refrigerated, and the condenser is alsocooled with water. The compressor receives shaft power equivalent to 7.5 hp.Neglecting changes in kinetic and potential energy changes and any heat loss betweendevices, please answer the following.a. Complete the table below and sketch the cycle processes on a T-s diagram.When completing the table please use the same number of decimal places as inthe tables.b. Determine the cooling capacity of the refrigeration unit, in Tons (1 refrigerationTon = 211 kJ/min).c. Compute the COP.d. Determine the volume flow rate of refrigerant entering the condenser in L/min.e. Determine the mass flow rate of cooling water passing through the condenser.f. Determine the heat transfer rate from the compressor.g. Compute the rate of entropy generation in the…