Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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Chapter 7, Problem 7.14P
A condenser receives R−410A at −20°C and quality 80%, with the exit flow being saturated liquid at −20°C. Consider the cooling to be a reversible process and find the specific heat transfer from the entropyequation.
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A heat exchanger is used to cool an air flow from 900 to 400 K, with both states at 1 MPa. The coolant is water flow at 20 degrees C and 0.1 MPa. If the water leaves a saturated vapor, find the ratio of the flow rates (mass flowwater/mass flowair.
4. An evaporator has R-410A at -20°C and quality 80% flowing in. The exit flow is saturated vapor at
-20°C.
a. Consider the heating to be a reversible process and find the specific heat transfer from the
entropy balance. (Answer: 48.7 kJ/kg)
b. If the heat source was at -10°C and the inlet and outlet streams still have the same properties as
in a), calculate the specific entropy generation? (Answer: 7.33 J/(kg K))
The pressure and temperature entering the turbine is 1800kpaa and 380oC. The temperature leaving the turbine is 20kpa. The quality of steams entering the condenser is 90%. Find the turbine work in kJ/kg.
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- A condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa quality 95% to saturated liquid at 10 kPa. The cooling is done by lake water at 20 degree Celsius that returns to the lake at 30 degree Celsius. For an insulated condenser, find the flow rate of cooling water.arrow_forwardA compressor brings R-134a from 150 kPa, -10 degree Celsius to 1200 kPa, 50 degree Celsius. It is water cooled, with heat loss estimated as 40 kW, and the shaft work input is measured to be 150 kW. What is the mass flow rate through the compressor?arrow_forwardWater at 50°C is cooled in a cooling tower which has an efficiency of 65%. The temperature of the surrounding air is 35°C dry bulb and 70% relative humidity. The heat dissipated from the condenser is 2,000,000kJ/hr. Find the capacity in liters per second of the pump used in the cooling tower.arrow_forward
- 2. 1 kg/s steam enters the turbine at 2.5MPa and 500C while leaving at 10kPa with 89% quality. The pump exit condition is at 2.5 MPa and 50C. Find the turbine work output and heat added in the boiler in kW. (20 points)arrow_forwardA steam with a quality of 49%, enters an adiabatic nozzle at 3.5 MPa and leaves at 0.4 MPa and 140 oC with a flow of 7 m/s. Find the entrance velocity, in m/s.arrow_forwardI need help on the following question: The vapour compression cycle (picture provided), utilises the refrigerant R134a flowing at 0.05 kg s-1. Assuming that the compression is adiabatic and reversible. If the actual input power to the compressor is 2 kW, then: 1. You need to determine the theoretical input power to the compressor and the heat transfer (Φ) to theevaporator. Take the enthalpies h1, h2, and h3 to be 238.41, 263.68 and 81.5 kJ kg-1 (use the 'NH3 Refrigeration Table' where you can find online). 2. You need to determine the coefficient of performance based on your answer to the previous question (1). 3. You need to determine the compressors mechanical efficiency.arrow_forward
- Find the minimum flow of cooling water per kWh if its temperature is only allowed to increase by10°C.arrow_forwardA closed constant volume system receives 10.5 kJ of paddle work. The system contains oxygen at 344 kPa, 278 K and 0.06 m3. Find the heat loss if the final temperature is 400 K.arrow_forwardA steam is expanded through a nozzle and the enthalphy drop per kg of steam from the initial pressure to the final pressure is 70 kJ. Neglecting the friction, find the velocity of discharge.arrow_forward
- Air enters an insulated compressor at ambient conditions, 100 kPa, 20oC at the rate of0.2 kg/s and exits at 500 K. The isentropic efficiency of the compressor is 70%. Whatis the exit pressure? How much power is required to drive the compressor? Assumespecific heats at room temperatures.arrow_forwardSteam is admitted to a turbine at 600 psia and 740 F ,and exhausts to a condenser at a pressure of 1 psia . Assuming the process to be isentropic , find the drop in enthalpy , Btu/lb .arrow_forwardA flow of 3 kg/s of superheated steam at 300 kPa and 300°C is mixed with liquid water at 300 kPa and 90°C so that the output is a flow of saturated steam at 300 kPa. Assume the mixing chamber is insulated, find the flow rate of liquid water needed for the process.arrow_forward
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