A reversible heat engine rejects 50 percent of the heat supplied during a cycle of operation. If this engine is reversed and operates as a heat pump, then what is its coefficient of performance?
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- 1. An ideal Ericsson engine using helium as the working fluid operates between temperature limits of 600 R and 3500 R and pressure limits of 20 and 250 psia. Assuming a mass flow rate of 20 Ibm/min, determine (a) the thermal efficiency of the cycle, (b) the heat transfer rate in the regenerator in Btu/min (c) the power delivered in hpA medium size power station is used to produce 30 MW net power for arefinery. The station uses steam as the operating fluid and operatesaccording to the Carnot cycle between the pressure limits of 0.4 bar and35 bar. Steam enters the boiler as a saturated liquid and leaves it as adry saturated vapour. (i) List the name of the four processes in a generic Carnot cycle andstate what type of energy transfer (work/heat) can be neglectedin each process. (ii) Determine the dryness fraction of the steam that is fed to thecondenser, and the specific enthalpy values at the four key points ofthe cycle. (iii) Calculate the specific heat provided to the boiler, the specificwork extracted from the power station and the mass flow rate ofthe steam circulating in the cycle, then, determine the thermal efficiency of the cycle.Data are provided for two reversible refrigeration cycles. One cycle operates between hot and cold reservoirs at 27°C and 3°C, respectively. The other cycle operates between the same hot reservoir at 27°C and a cold reservoir at -35°C. The refrigerator removes the same amount of energy by heat transfer from its cold reservoir. Determine the ratio of the net work input values of the two cycles, WCycle,2 Wcycle,1
- True or false Heat is transferred to a system by either a cheap commercially available air-sourced heat pump with coefficient of performance of just 1.5, or an expensive 100% efficient electrical resistance heater. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is minimum when heat is added by the cheap commercial heat pump. Heat is transferred to a system by either a cheap commercially available air-sourced heat pump with coefficient of performance of just 1.5, or an expensive 100% efficient isothermal heat source. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is minimum when heat is added by the isothermal heat source.An engine works on the basis of Carnot cycle operating between temperatures of 800 K and 400 K. If the heat supplied is 100 kW, the output isAn ideal vapor compression cycle operates between the temperature limits of -5 °C and 30 °C and uses R134a as the refrigerant, which flows at a rate of 0.6 kg/s. The minimum power (kW) required to drive the compressor is . kW to one decimal place. ....
- (1) A reversed Carnot cycle is used for refrigeration and rejects 1,000 kW of heat at 340 K while receiving heat at 250 K. Determine (a) COP, (b) the power required, and (c) the refrigerating effect. Ans. (a) 2.778, (b) 264.7 kW (c) 735.3 kWWhat are the practical limitations to maximum work being able to be done from an engine when all the processes ard reversible.A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour.(i) List the name of the four processes in a generic Carnot cycle and state what type of energy transfer (work/heat) can be neglected in each process. ii) Sketch a T-s diagram for the above cycle indicating the location of the four components required. (iii) Determine the dryness fraction of the steam that is fed to the condenser. (iv) Determine the specific enthalpy values at the four key points of the cycle. (v) Calculate the specific heat provided to the boiler, the specific work extracted from the power station and the mass flow rate of the steam circulating in the cycle (vi) Determine the thermal efficiency of the cycle. (vii) Using the highest and lowest temperature values in the…
- A vapor compression refrigeration cycle operates at steady flow conditions with 0.25 kg/s or R-134a. The table below shows some of the operating parameters and properties for the refrigerant. The compressor is réfrigerated, and the condenser is also cooled with water. The compressor receives shaft power equivalent to 7.5 hp. Neglecting changes in kinetic and potential energy changes and any heat loss between devices, 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 in the tables. b. 123456 Determine the cooling capacity of the refrigeration unit, in Tons (1 refrigeration Ton=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. 1. Determine the heat transfer rate from the compressor. g. Compute the rate of entropy…A vapor compression refrigeration cycle operates at steady flow conditions with 0.25 kg/s or R-134a. The table below shows some of the operating parameters and properties for the refrigerant. The compressor is refrigerated, and the condenser is also cooled with water. The compressor receives shaft power equivalent to 7.5 hp. Neglecting changes in kinetic and potential energy changes and any heat loss between devices, 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 in the tables. 123456 b. Determine the cooling capacity of the refrigeration unit, in Tons (1 refrigeration Ton = 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…4. An ideal vapor-compression heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20°C when the outside temperature is 5°C. Saturated vapor at 2.4 bar leaves the evaporator, and saturated liquid at 8 bar leaves the condenser. Calculate (a) The power input to the compressor, in kW. (b) The coefficient of performance. (c) The coefficient of performance of a Carnot heat pump cycle operating between thermal reservoirs at 20 and 5 °C.