(a) Interpretation: The rate at which heat is transferred from the condenser is to be calculated. Concept introduction: The rate of heat transfer is calculated as: Q ˙ = n ˙ Δ H ^ .......(1) For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus, Q ˙ g a i n = − Q ˙ l o s t .......(2)

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Answer 1

Question

Chapter 8, Problem 8.43P

Interpretation Introduction

(a)

Interpretation:

The rate at which heat is transferred from the condenser is to be calculated.

Concept introduction:

The rate of heat transfer is calculated as:

Q˙=n˙ΔH^ .......(1)

For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus,

Q˙gain=−Q˙lost .......(2)

Interpretation Introduction

(b)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the lower rate than that calculated in part (a).

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Interpretation Introduction

(c)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the higher rate than that calculated in part (a). Also, a phase diagram is to be drawn.

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

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2000 Kg/hr on an acetone water mixture containing 10% of acetone is to be extracted with trichloroethane. The recovered solvent to be used is free of acetone. If 95% recovery of acetone is desired, the equilibrium relationship is given by kg acetone/kg trichloroethane 1.65 kg acetone/kg water. Estimate the number of stages required if 1.5 times the minimum solvent is used when: - a- Cross-current is to be extracted. b- b- Counter-current is to be extracted.

2/1000kg/h of an acetone - water mixture containing 20wt% by weight of acetone is to be counter currently extracted with trichloroethane. The recovered solvent to be used is free from acetone. The water and trichloroethane are insoluble. If 90% recovery of acetone is desired estimate the number of stages required if 1.5 times the minimum solvent is used. The kg acetone/kg extract=1.65 kg water/kg raffinate. a- Repeat the calculation of A if the solvent used has purity of 98.5%. b- If co-current extractor is used instead of counter-current extractor in A and B estimate the number of stages required if equal amount of solvent used in each stage.

Water is pumped from a large reservoir to a point 75 feet higher than the reservoir. How many feet of head must be added by the pump if 7600 lbm/hr flows through a 6-inch pipe and the frictional head loss is 3 feet? The density of the fluid is 60 lbm/ft³ and the pump efficiency is 70%. Assume the kinetic energy correction factor equals 1.

Answer 2

Question

Chapter 8, Problem 8.43P

Interpretation Introduction

(a)

Interpretation:

The rate at which heat is transferred from the condenser is to be calculated.

Concept introduction:

The rate of heat transfer is calculated as:

Q˙=n˙ΔH^ .......(1)

For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus,

Q˙gain=−Q˙lost .......(2)

Interpretation Introduction

(b)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the lower rate than that calculated in part (a).

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Interpretation Introduction

(c)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the higher rate than that calculated in part (a). Also, a phase diagram is to be drawn.

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

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Answer 3

Question

Chapter 8, Problem 8.43P

Interpretation Introduction

(a)

Interpretation:

The rate at which heat is transferred from the condenser is to be calculated.

Concept introduction:

The rate of heat transfer is calculated as:

Q˙=n˙ΔH^ .......(1)

For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus,

Q˙gain=−Q˙lost .......(2)

Interpretation Introduction

(b)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the lower rate than that calculated in part (a).

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Interpretation Introduction

(c)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the higher rate than that calculated in part (a). Also, a phase diagram is to be drawn.

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

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Answer 4

Question

Chapter 8, Problem 8.43P

Interpretation Introduction

(a)

Interpretation:

The rate at which heat is transferred from the condenser is to be calculated.

Concept introduction:

The rate of heat transfer is calculated as:

Q˙=n˙ΔH^ .......(1)

For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus,

Q˙gain=−Q˙lost .......(2)

Interpretation Introduction

(b)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the lower rate than that calculated in part (a).

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Interpretation Introduction

(c)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the higher rate than that calculated in part (a). Also, a phase diagram is to be drawn.

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

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Answer 5

Chapter 8, Problem 8.43P

Interpretation Introduction

(a)

Interpretation:

The rate at which heat is transferred from the condenser is to be calculated.

Concept introduction:

The rate of heat transfer is calculated as:

Q˙=n˙ΔH^ .......(1)

For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus,

Q˙gain=−Q˙lost .......(2)

Interpretation Introduction

(b)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the lower rate than that calculated in part (a).

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Interpretation Introduction

(c)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the higher rate than that calculated in part (a). Also, a phase diagram is to be drawn.

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Answer 6

Chapter 8, Problem 8.43P

Interpretation Introduction

(a)

Interpretation:

The rate at which heat is transferred from the condenser is to be calculated.

Concept introduction:

The rate of heat transfer is calculated as:

Q˙=n˙ΔH^ .......(1)

For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus,

Q˙gain=−Q˙lost .......(2)

Answer 7

Chapter 8, Problem 8.43P

Interpretation Introduction

(a)

Interpretation:

The rate at which heat is transferred from the condenser is to be calculated.

Concept introduction:

The rate of heat transfer is calculated as:

Q˙=n˙ΔH^ .......(1)

For an adiabatic system, the heat lost by one component in the system is the heat gained by another component in that system. Thus,

Q˙gain=−Q˙lost .......(2)

Answer 8

Interpretation Introduction

(b)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the lower rate than that calculated in part (a).

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the lower rate than that calculated in part (a).

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Answer 10

Interpretation Introduction

(c)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the higher rate than that calculated in part (a). Also, a phase diagram is to be drawn.

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Answer 11

Interpretation Introduction

(c)

Interpretation:

The state of the product stream is to be determined if the heat is transferred at the higher rate than that calculated in part (a). Also, a phase diagram is to be drawn.

Concept introduction:

Removal of heat from any vapor at its normal boiling point leads to the condensation of the vapor to liquid phase until all the vapor is condensed and further removal of heat leads to the cooling of the liquid. If less heat is removed from the vapor, then partial condensation happens, and vapor and liquid coexist at its normal boiling point.

Answer 12

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Answer 13

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Answer 14

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Answer 15

Ch. 8 - 8.1. The specific internal energy of formaldehyde...Ch. 8 - Prob. 8.2P Ch. 8 - Prob. 8.3P Ch. 8 - Prob. 8.4P Ch. 8 - Prob. 8.5P Ch. 8 - 8.6. Table B.7 of Appendix B gives the following...Ch. 8 - Prob. 8.7P Ch. 8 - Two formulas for the heat capacity of CO are given...Ch. 8 - 8.9. Table B.2 lists values of the heat capacity...Ch. 8 - Prob. 8.10P

Solution Summary: The author explains the rate at which heat is transferred from the condenser.

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