Industrial Heating Principles, Techniques, Materials, Applications, and Design 1st. Edition by Yeshvant V. Deshmukh | 9780849334054 | 0849334055 | Holooly

Mechanics of Materials

Industrial Heating Principles, Techniques, Materials, Applications, and Design

67 SOLVED PROBLEMS

Question: 9.1

A resistance-heated furnace is to be designed with following requirements: Working space = 30 × 40 × 100 cm Occasional maximum temperature = 1250°C Continuous working temperature = 1150°C Atmosphere = Air Estimated power = 24 kW Available voltage = 440 V–3ph Specific resistivity ...

Verified Answer:

The furnace atmosphere is oxidizing. Working tempe...

Question: 9.3

Design an indirect resistance furnace as specified below. Working Space 60 × 45 × 90 cm Continuous temperature 1550°C Occasional maximum temperature 1600°C Estimated power 52 kW Electric supply 380 V, 3 ph Now determine: Heater material No. of heaters and connections Voltage and current Transformer ...

Verified Answer:

Working volume = 45 (W) × 60 (H) × 90 (D) 2.5 × [l...

Question: 5.1

A fuel oil has following properties: Analysis W +% Carbon – 86.20 Hydrogen – 12.30 Sulfur – 1.50 Calorific value – 43.40 MJ/kg Theoretical air for combustion – 10.71 m³/kg oil Volume of combustion products – 11.40 m³/kg Composition of combustion products, % volume CO2 – 13.5% H2O – 12.3% N2 – 74.2% ...

Verified Answer:

The combustion reaction for oil can be written as ...

Question: 10.1

Determine the depth of penetration for 0.4% carbon steel heated from 30–900°C at 1000 Hz. The resistivity and permeability at various temperatures is given below. ...

Verified Answer:

\delta=5030 \sqrt{\frac{\rho}{\mu_\gamma f}...

Question: 9.4

Design a heating element for heating a metal specimen in a hot stage microscope. Specimen size 25 mm diameter 15 mm thick Maximum temperature 1500°C Atmosphere Air or Helium/Argon Power estimate for hot chamber 800 W ...

Verified Answer:

The heating element required has to be very compac...

Question: 9.2

A muffle furnace is to be designed for silicon carbide heaters. Size of heating space (nominal) 28 (W) × 22 (H) × 120 (D) cm Maximum temperature 1400°C Atmosphere Air Estimated power 15 kW Power supply 380 V, 3 phase Heating elements to be situated at the top across the width. Now determine: ...

Verified Answer:

The width of the chamber is 28 cm. The heating ele...

Question: 4.7

A two-layer furnace wall consists of a 60-mm ceramic wool material on the hot side and an 80-mm rock wool layer on the cold (outer) side. The initial temperature of the furnace and the atmosphere is 30°C. The heat is then turned on to obtain a temperature of 1250°C on the inside. Find the heat ...

Verified Answer:

For ceramic wool Thermal diffusivity

\alpha...

Question: 5.4

A fuel oil has the following composition (%) Carbon – 86.5 Hydrogen – 11.5 Oxygen – 1.0 N, S and ash – 1.0 Now determine: 1. The heating (calorific) value per kg 2. Air required for combustion 3. Volume and composition of combustion products 4. Theoretical combustion temperature 5. Composition and ...

Verified Answer:

Calorific value as per Mendeleev formula

Q^...

Question: 5.3

A sewage (bio) gas has the following composition (volume basis) CH4 – 65% CO2 – 33% N2 – 1% H2S – 1% Now determine: 1. The heating value 2. Air required for combustion 3. Amount of flue gases with no excess air 4. Composition of flue gases 5. Theoretical flame temperature ...

Verified Answer:

The given composition of the gas shows that methan...

Question: 5.2

The composition of a sample of waste material to be incinerated is as follows (in wt %) Moisture – 24.0 Carbon – 28.0 Hydrogen – 3.5 Oxygen – 22.0 Nitrogen – 0.33 Sulfur – 0.16 Noncombustible matter (ash, metals, glass, etc.) –23.10 Determine (on 1 kg basis) 1. Heat required to be externally ...

Verified Answer:

The sample contains 25% moisture. In incineration ...

Loading...