(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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A single effect evaporator is used to concentrate 10 000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15 ° C. The evaporator is operated on Steam (80% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 75 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) Steam demand rate = Answer kg / hour. b. Steam economy when condensate temperature is released at 75 ° C. = Answer (kg of water evaporated / kg of steam)

An air conditioner cools 226 m3/min of humid air at 36°C and 98% relative humidity to 10°C.(a) Do a degree-of-freedom analysis to prove that enough information is available to determine the required cooling duty (rate of heat transfer).(b) Calculate the rate of condensation of water in the unit and the cooling duty in tons (1 ton = 12,000 Btu/h).

The synthesis of methanol from carbon monoxide and hydrogen is carried out in a continuous vapor-phase reactor at 5.00 atm absolute. The feed contains cO and H2 in stoichiometric proportion and enters the reactor at 25.0°C and 5.00 atm at a rate of 31.1 m³/h. The product stream emerges from the reactor at 157°C. The rate of heat transfer from the reactor is 21.0 kW. Calculate the fractional conversion (0 to 1) of carbon monoxide achieved and the volumetric flow rate (m3/h) of the product stream. f = Vout ! m3/h

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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