FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Chapter 5, Problem 5.18P
R−410A enters the evaporator (the cold beat exchanger) in an air−conditioner unit at −20°C,
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The evaporator (a heat exchanger) in an A/C unit has R-410A entering at -20 °C and a quality of 30% and
leaves at the same temperature and a quality of 100%. The COP of the air conditioner is known to be 1.3
and the mass flow rate is given as 0.013 kg/s. Find the power input to the cycle.
(Note that, here, the evaporator is the part of the A/C unit that accepts [i.e., withdraws] heat from the
room maintained at a cold temperature)
A refrigeration system operated on an ideal vapor-compression using R-12 with a vaporizing temperature of -10 degrees Celsius and a condensing temperature of 30 degrees Celsius, it requires 15 hp to drive the motor of the compressor. Find the ff:
Enthalpies at each point of the cycle in kJ/kg
Refrigerating Capacity in TOR • Mass of the Refrigerant in kg/s
Percent Quality in the mixture
Heat Rejected in kW Coefficient of Performance
• Schematic and P-h Diagram
Please state assumptions and tables.
Chapter 5 Solutions
FUNDAMENTALS OF THERMODYNAMICS
Ch. 5 - Prob. 5.1PCh. 5 - A windowmounted air conditioner removes 3.5kJ from...Ch. 5 - R410A enters the evaporator (the cold beat...Ch. 5 - A large heat pump should upgrade 4MW of heat at...Ch. 5 - A car engine 5g/s fuel (equivalent to addition of...Ch. 5 - Prob. 5.37PCh. 5 - R134a fills a 0.1m3 capsule at 20°C, 200kPa. It is...Ch. 5 - Air in a piston/ cylinder goes through a Carnot...Ch. 5 - A heat engine receives 7kW from a 300°C source and...Ch. 5 - Consider the previous problem and assume the...
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- Condensers in these refrigerators are all_______cooled.arrow_forwardQ.13 A vapour compression refrigeration system using refrigerant F-12 is employed to produce 8640 kg of ice per day. The condensing and evaporating temperature of refrigcrant are 48°C and-20°C respectively. Saturated liquid leaves the condenser and saturated vapour leaves the evaporator. Compression is isentropic, water at 35°C is used to form the ice. The temperature of ice should be-8°C. Heat flow into the brine tank from surroundings may be taken as 10% of total heat absorbed from water to form ice. Determine the power required to drive the compressor. Take specific heat of ice 2.26 kJ/kg-K. Latent heat of ice = 335 kJ/kg. Specific heat of water = 4.2 kJ/kg-K. The following data may be used: %3D Temp. Pressure Enthalpy Entropy °C bar kJ/lg kJ/kg-K Liquid Vapour Liquid Vapour 48°C 11.64 82.83 205.83 0.2973 0.6802 -20 1.51 17.82 178.74 0.0731 0.7087 Specific heat of vapour 0.82 kJ/kg %3Darrow_forward100 ton of vapor compression refrigeration system using R-134a the vapor entering the evaporator at 2 bar and entering the condenser at 10 bar, the pressure drops in suction valve and discharge valve equal to 0.25 bar and 1.0 bar respectively. assume the refrigerant leaving the evaporator and condenser at saturated line find: (1) Refrigeration Effect (2) Power required in compressor (3) Actual COP of the cycle (4) Ideal COP of the cyclearrow_forward
- REFRIGERATION ENGINEERING USE SHAPIRO AND MORAN STEAM TABLESarrow_forwardIn a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 OC before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required.arrow_forwardAn open-cycle gas turbine plant will exhaust into a waste heat boiler which receives 66 0C feedwater. The gas turbine plant produces 2611 kW. Air flow rate is 37 kg/kW-hr. Fuel rate, rf/a = 0.014 kg fuel/kg air. Actual exhaust gas temperature = 483 0C. Average exhaust gas Cp = 1.082 kJ/kg.K. Compute the saturated steam at 0.450 MPa that can be produced per hour, assuming that the final gas temperature is 38 0C above the saturation temperature. Show the necessary diagrams.arrow_forward
- An open-cycle gas turbine plant will exhaust into a waste heat boiler which receives 66 0C feedwater. The gas turbine plant produces 2611 kW. Air flow rate is 37 kg/kW-hr. Fuel rate, rf/a = 0.014 kg fuel/kg air. Actual exhaust gas temperature = 483 0C. Average exhaust gas Cp = 1.082 kJ/kg.K. Compute the saturated steam at 0.450 MPa that can be produced per hour, assuming that the final gas temperature is 38 0C above the saturation temperature.arrow_forwardProvide the complete solution and diagram for this problem. A reversed Carnot cycle operating in a heat pump has an evaporator temperature of -4oC andcondenser temperature of 50oC. Find the performance factor if it will operate in a heat pump. A. 4.45 B. 3.45 C. 6.21 D. 5.9arrow_forward1.A vapor-compression refrigeration system, using R-134a, is being used to keep a food storage room under desired cold temperature. At steady state conditions, the evaporator temperature is 0°C, and the condenser temperature is 48°C. The cooling load on the refrigeration system is 8 tons of refrigeration. Calculate the refrigerant flow rate, the compressor power if the compressor efficiency is 78%, and C.O.P.arrow_forward
- Only solve last 2 parts ok Problem 2 – Heat Pump Thermodynamic Analysis Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 50°C at a rate of 35 L/min and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 3°C. Neglecting changes in kinetic and potential energy and any stray heat transfer, please answer the following.a. Create a schematic of the cycle, use the same numbers used in your textbook for the inlet and exit states of each device, and include the energy exchanges between the cycle devices and the surroundings.b. Sketch the cycle processes on a T-s diagram.c. Determine the isentropic efficiency of the compressor.d. Compute the rate of heat supplied to the heated room.e. Determine the COP of the heat pump.arrow_forwardFrom the given data, if refrigerant circulation rate is 0.025kg/s, find the refrigerant effect of the ideal vapour compression cycle.arrow_forward3.5 An ammonia refrigeration system operates between saturated suction temperature of -20°C, and saturated discharge temperature of +40°C. Com- pare the COP of the cycle using wet compression with that of the cycle using dry compression. Assume that the vapour leaving the compressor is saturated in the case of wet compression, and the vapour entering the compressor is saturated in the case of dry compression. The refrigerant leaves the condenser as saturated liquid.arrow_forward
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