rom the production well at a rate of 220 kg/s and is flashed to a pressure of 500 kPa. The condenser pressure is 10 kPa. The liquid exiting the separator passes through a heat exchanger that serves as the heat source in a binary cycle that uses isobutane. The geothermal liquid exits the heat exchanger at 90oC. Isobutane en

rom the production well at a rate of 220 kg/s and is flashed to a pressure of 500 kPa. The condenser pressure is 10 kPa. The liquid exiting the separator passes through a heat exchanger that serves as the heat source in a binary cycle that uses isobutane. The geothermal liquid exits the heat exchanger at 90oC. Isobutane en

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Similar questions

Consider a water-ammonia binary vapor cycle consisting. In the steam cycle,superheated vapor enters the turbine at 7 MPa, 450oC, and saturated liquid exits thecondenser at 55oC. The heat rejected from the steam cycle is provided to the ammoniacycle, producing saturated vapor at 45oC, which enters the ammonia turbine.Saturated liquid leaves the ammonia condenser at 1 MPa. For a net power output of24 MW from the binary cycle, determine (c) the rate of heat input to the ammoniacycle, in MW, (d) the rate of heat addition to the binary cycle, in MW, and (e) thethermal efficiency of the binary vapor cycle.
Consider a water-ammonia binary vapor cycle consisting. In the steam cycle,superheated vapor enters the turbine at 7 MPa, 450oC, and saturated liquid exits thecondenser at 55oC. The heat rejected from the steam cycle is provided to the ammoniacycle, producing saturated vapor at 45oC, which enters the ammonia turbine.Saturated liquid leaves the ammonia condenser at 1 MPa. For a net power output of24 MW from the binary cycle, determine (a) the mass flow rates for the steam andammonia cycles, respectively, in kg/s, (b) the power output of the steam andammonia turbines, respectively, in MW.
Consider a water-ammonia binary vapor cycle consisting. In the steam cycle, superheated vapor enters the turbine at 7 MPa, 450C, and saturated liquid exits the condenser at 55C. The heat rejected from the steam cycle is provided to the ammonia cycle, producing saturated vapor at 45C, which enters the ammonia turbine. Saturated liquid leaves the ammonia condenser at 1 MPa. For a net power output of 24 MW from the binary cycle, determine (a) the mass flow rates for the steam and ammonia cycles, respectively, in kg/s, (b) the power output of the steam and ammonia turbines, respectively, in MW. (c) the rate of heat input to the ammonia cycle, in MW, (d) the rate of heat addition to the binary cycle, in MW, and (e) the thermal efficiency of the binary vapor cycle.
Air enters the compressor of an ideal Brayton refrigeration cycle at 100 kPa, 270 K. The compressor pressure ratio is 3 and the temperature at the turbine inlet is 310 K. Determine:d).the coefficient of performance of a Carnot refrigeration cycle operating between thermal reservoirs at TC 270 K and TH 310 K, respectively. The above Brayton refrigeration cycle is modified by introducing a regenerative heat exchanger. In the modified cycle, the compressed air enters the regenerative heat exchanger at 310 K and is cooled to 280 K before entering the turbine. Determine for the modified cycle:(e).the lowest temperature, in K.f).the net work input per unit mass of air flow, in kJ / kg.
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The net work output and the thermal efficiency for the Carnot and the simple ideal Rankinecycles with steam as the working fluid are to be calculated and compared. Steam enters theturbine in both cases at 10 MPa as a saturated vapor, and the condenser pressure is 20 kPa.In the Rankine cycle, the condenser exit state is saturated liquid and in the Carnot cycle, theboiler inlet state is saturated liquid. Draw the T-s diagrams for both cycles.
A steam power plant with a closed feedwater Heater operates on a regenerative Rankine cycle with reheating. Steam enters the turbine at 8 MPa pressure and 5YX C temperature, 1Y kg/s flow rate, and condenses in the condenser at 2X kPa pressure. The intermediate heating is condensing at a pressure of 3 MPa. Intermediate heating is done at a pressure of 3 MPa and the steam is heated to a temperature of 5X0 C. Some steam is separated from the low pressure turbine at a pressure of 1 MPa, after it is completely condensed in the closed feed water heater, it is pumped to a pressure of 8 MPa before mixing with the feed water at the same pressure. Assuming the isentropic efficiencies of the turbines and pumps are 8Y.X%, calculate (a) the temperature of the steam at the inlet of the closed feedwater heater, (b) the mass flow rate of the steam leaving the turbine for the closed feedwater heater, (c) the net power, and (d) the thermal efficiency.note: x=2,y=7
Water is the working fluid in an ideal Rankine cycle. The superheated vapor enters the turbine at 8 MPa, 480°C. The condenser pressure is 8 kPa. The net power output of the cycle is 100 MW. Determine for the cycle (a) the rate of heat transfer to the working fluid passing through the steam generator, in kW. (b) the thermal efficiency. (c) the mass flow rate of condenser cooling water, in kg/h, if the cooling water enters the condenser at 15°C and exits at 35°C with negligible pressure change. Provide a schematic diagram and T/S diagram. Note: please provide a concise working solution with complete reasonings. Thank you so much, I will give a like immediately if the request is done.
A power station consists of a four-unit coal fired power station, having a combined capacity of 2,880 MW. The current efficiency of each unit is around 37.7%. You are asked to improve the thermal efficiency of each unit by lowering the condenser pressure. To simplify this task, assume that each unit operates on a simple ideal Rankine cycle. If the superheated vapour enters the turbine at 10 MPa and 500 ֯C and is cooled in the condenser at a lower pressure 10 kPa, determine the quality of the steam at the turbine exit and the thermal efficiency of the cycle for one unit.
Air enters the compressor of an ideal Brayton refrigeration cycle at 100 kPa, 270 K. The compressor pressure ratio is 3 and the temperature at the turbine inlet is 310 K. Determine:The above Brayton refrigeration cycle is modified by introducing a regenerative heat exchanger. In the modified cycle, the compressed air enters the regenerative heat exchanger at 310 K and is cooled to 280 K before entering the turbine. Determine for the modified cycle:f).the net work input per unit mass of air flow, in kJ / kg. g).the cooling capacity, per unit mass of air flow, in kJ / kg.h).the coefficient of performance.
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