Introduction to Thermodynamics and Heat Transfer: Solutions Manual 2nd. Edition by Yunus A. Cengel | Holooly

Heat Transfer, Thermodynamics

Introduction to Thermodynamics and Heat Transfer: Solutions Manual

1889 SOLVED PROBLEMS

1 SOLVED PROBLEMS

Question: 6.169

Reconsider Prob. 6–168. Using EES (or other) software, investigate the effects of turbine exit area and turbine exit pressure on the exit velocity and power output of the turbine. Let the exit pressure vary from 10 to 50 kPa (with the same quality), and the exit area to vary from 1000 to 3000 cm². ...

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Problem 6-168 is reconsidered. The effects of turb...

Question: 7.44

A food freezer is to produce a 5 kW cooling effect, and its COP is 1.3. How many kW of power will this refrigerator require for operation? ...

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The cooling effect and the COP of a refrigerator a...

Question: 7.43

A refrigerator used for cooling food in a grocery store is to produce a 10,000 kJ/h cooling effect, and it has a coefficient of performance of 1.35. How many kilowatts of power will this refrigerator require to operate? ...

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The cooling effect and the COP of a refrigerator a...

Question: 7.47

A household refrigerator that has a power input of 450 W and a COP of 2.5 is to cool five large watermelons, 10 kg each, to 8°C. If the watermelons are initially at 20°C, determine how long it will take for the refrigerator to cool them. The watermelons can be treated as water whose specific heat ...

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The COP and the power consumption of a refrigerato...

Question: 7.45

A heat pump has a COP of 1.7. Determine the heat transferred to and from this heat pump when 50 kJ of work is supplied. ...

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The COP and the work input of a heat pump are give...

Question: 7.E.46

Water enters an ice machine at 55°F and leaves as ice at 25°F. If the COP of the ice machine is 2.4 during this operation, determine the required power input for an ice production rate of 28 lbm/h. (169 Btu of energy needs to be removed from each lbm of water at 55°F to turn it into ice at 25°F.) ...

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The COP and the refrigeration rate of an ice machi...

Question: 7.49

Reconsider Prob. 7–48. Using EES (or other) software, determine the power input required by the air conditioner to cool the house as a function for airconditioner EER ratings in the range 9 to 16. Discuss your results and include representative costs of air-conditioning units in the EER rating ...

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Problem 7-48 is reconsidered. The rate of power dr...

Question: 7.50

A house that was heated by electric resistance heaters consumed 1200 kWh of electric energy in a winter month. If this house were heated instead by a heat pump that has an average COP of 2.4, determine how much money the home owner would have saved that month. Assume a price of 8.5¢/kWh for ...

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A house is heated by resistance heaters, and the a...

Question: 7.E.51

A heat pump with a COP of 1.4 is to produce a 100,000 Btu/h heating effect. How much power does this device require, in hp? ...

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The COP and the heating effect of a heat pump are ...

Question: 7.52

A food refrigerator is to provide a 15,000 kJ/h cooling effect while rejecting 22,000 kJ/h of heat. Calculate the COP of this refrigerator. ...

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The cooling effect and the rate of heat rejection ...

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Question: 3.31

Complete this table for refrigerant-134a: ...

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Complete the following table for Refrigerant-134a:

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