The engine generates electrical power at 1MW. At 500°C a temperature of 1.5MW heat is sent from the heater to the high temperature boiler. The engine also absorbs 0.5MW as heat from burning fuel at a temperature of 300 °C. Engine cooling occurs in the environment at a temperature of 25°C a. Calculate the amount of heat that needs to be removed from the system at 25°C (cooling requirements) b. Can this machine operate as planned? Prove your answer with the concept of entropy

The engine generates electrical power at 1MW. At 500°C a temperature of 1.5MW heat is sent from the heater to the high temperature boiler. The engine also absorbs 0.5MW as heat from burning fuel at a temperature of 300 °C. Engine cooling occurs in the environment at a temperature of 25°C a. Calculate the amount of heat that needs to be removed from the system at 25°C (cooling requirements) b. Can this machine operate as planned? Prove your answer with the concept of entropy

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

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 13RQ: If 14 gpm of water is flowing through an open-loop heat pump with a temperature difference of 7F,...

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During a fall season a heat pump is operating on a heating mode to maintain a large convention hall at 24°C during which the outside temperature is 5ºC. The system is using R134a as a working fluid. The refrigerant leaves the condenser at 30°C and enters a compressor at -5°C. The refrigerant flow rate is 0.3 kg/s. Assume an ideal VCC to evaluate the system and report the followings: a. Draw the system b. Draw process flow diagram for the cycle c. Draw detail Ts diagram for this cycle d. Heating capacity kJ/hr e. What is the COP of the system? Is actual COP is higher or lower? Explain. f. What is the power required kW and hp? g. What is maximum COP?
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Help ode Delay 1. An ice-making machine is required to remove 0.7 Btu/s of heat from water to produce ice (Qin). This ice machine is a refrigerator that operates steadily using R134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 20 psia and leaves the condenser as saturated liquid at 80 psia. Draw a diagram showing the components of the refrigeration system inside the machine b. Show the cycle on a T-s diagram а. С. Calculate the work input required by the machine [0.176 hp or 0.124 Btu/s] d. What is the COP of this device? What does this represent? [5.6]
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A reversible refrigerator operates using a Carnot refrigeration cycle. It operates usingr-134a between 140 and 400 kPa. The refrigerant exits the compressor (and enters the condenser) assaturated vapor. It also leaves the condenser as saturated liquid.a. Sketch the P-v and T-s diagram of this cycle. Define the coordinate properties of each state oneach graph.b. Evaluate the specific heat and specific work properties of each (in kJ/kg). Indicate the sense.c. Evaluate the coefficient of performance using the specific heats and works from the previousitem. Did it match with the COPR obtained if you used the operating temperatures? Solve for states first. Then, show the solution to each of the above required in order.
An improved refrigeration system with a heat exchanger is shown in the following picture. The heat exchanger is used to superheat the vapor entering the compressor while subcooling the liquid leaving the condenser. The system uses R-134a. The evaporator operates at 15oF and the condenser operates at 100 psia. The heat exchanger provides 40oF of subcooling at the throttle valve entrance. a) Calculate the entropy generation at the throttle for the simple refrigeration cycle. Calculate also the entropy generation of the universe (throttle + surroundings) due to this operation. b) Calculate the process efficiency of the heat exchanger for the refrigeration cycle that includes the heat exchanger
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