The mass of 10 kg of air in a piston-cylinder device is heatedfrom 25°C to 77°C by passing a current through a resistance heaterinside the cylinder. The pressure inside the cylinder is heldconstant at 300 kPa during the process, and a heat loss of60 kJ occurs. Determine the electric energy supplied.WAIRPa constant

Given data: The initial temperature of the air is Tinitial = 25∘C = 298 K The final temperature of…

Answered: The mass of 10 kg of air in a…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

See similar textbooks

Similar questions

Solution the question in 15 mint
3 An electrical current of 700 A flows through a stainless steel cable having a diameter of 5 mm and an electrical resistance of 6 x 104 /m (i.e., per meter of cable length). The cable is in an environment having a tem- perature of 30°C, and the total coefficient associated with convection and radiation between the cable and the environment is approximately 25 W/m².K. (a) If the cable is bare, what is its surface temperature? (b) If a very thin coating of electrical insulation is applied to the cable, with a contact resistance of 0.02 m² K/W, what are the insulation and cable surface temperatures? (c) There is some concern about the ability of the insula- tion to withstand elevated temperatures. What thick- ness of this insulation (k = 0.5 W/m .K) will yield the lowest value of the maximum insulation temper- ature? What is the value of the maximum tempera- ture when this thickness is used? Note: The 25 W/m²K includes not only convection but also radiation.
One side of a copper block 5 cm thick is maintained at 250°C. The other side is covered with a layer of fiberglass 2.5 cm thick. The outside of the fiberglass is main- tained at 35°C, and the total heat flow through the copper-fiberglass combination is 52 kW. What is the area of the slab?
A thin metal plate 1 mx 1 m is placed on a rooftop. It receives radiant heat from the sun directly at the rate of 170 W/m². If heat transfer from the plate to the ambient occurs purely by free convection, calculate the steady state temperature of the plate. Assume that there is no heat loss from the bottom of the plate. The ambient temperature is 25°C.
Steam enters a heat exchanger operating at steady state at 2 bar with a specific enthalpy of 1845 kJ/kg and exits at the same pressure as a saturated liquid. The steam mass flow rate is 1.6 kg/min. A separate stream of air with a mass flow rate of 68.5 kg/min enters at 37 °C and exits at 66.3 °C. The ideal gas model with c, = 1.005 kJ/kg.K can be assumed for air. Kinetic and potential energy effects are negligible.
Transport Phenomena Question
The work done when a gas is expanded in a cylinder is -220 J. A heat transfer of 190 J occurs from the surrounding to the gas. Calculate ∆E of the gas in J.
03: Air is contained in a vertical cylinder fitted with frictionless piston and a set of stops. The piston cross -sectional area is (0.2 m²) and the air inside is initially at (200 kPa, 500°C). The air is then cooled as a result of heat transfer to the surroundings. a) What is the temperature of the air inside the cylinder when the piston reaches the stops? b) The cooling is now contained until the temperature reaches (20°C), what is the pressure at this state? Ans. [a) 113.4 °C, b) 151.7 kPa] Air 0.25 0.25
The wall of a spherical steel tank k, = 17 m. K thick contains hot oil at 100°C. On the outside of the tank 10mm of spray W urethane insulation k, = 0.026 m. K of 1m in diameter and 100 mm h = 16. is added to stop the oil from cooling. If the outside temperature is 25°C, W m².K needs to be added to keep the tank at 100°C for pumping reasons? What are the overall heat transfer coefficients (Uo and Ui)? and h = 5 (₁ m². K how much heat
Problem 8. Energy is generated uniformly in a 20cm thick wall the steady state temperature distribution of the wall is indicated on the table below; z (cm) T (C) 8 10 12 14 16 18 20 0 2 4 6 150 177 205 230 250 272 292 310 330 345 360 If thermal conductivity of the wall is 15 W/m.K and the indicated temperatures are in °C, determine the average rate of heat generation in unit volume.

Recommended textbooks for you

Introduction to Chemical Engineering Thermodynami…

Chemical Engineering

ISBN:

9781259696527

Author:

J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:

McGraw-Hill Education

Elementary Principles of Chemical Processes, Bind…

Chemical Engineering

ISBN:

9781118431221

Author:

Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard

Publisher:

WILEY

Elements of Chemical Reaction Engineering (5th Ed…

Chemical Engineering

ISBN:

9780133887518

Author:

H. Scott Fogler

Publisher:

Prentice Hall

Introduction to Chemical Engineering Thermodynami…

Chemical Engineering

ISBN:

9781259696527

Author:

J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:

McGraw-Hill Education

Elementary Principles of Chemical Processes, Bind…

Chemical Engineering

ISBN:

9781118431221

Author:

Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard

Publisher:

WILEY

Elements of Chemical Reaction Engineering (5th Ed…

Chemical Engineering

ISBN:

9780133887518

Author:

H. Scott Fogler

Publisher:

Prentice Hall

Process Dynamics and Control, 4e

Chemical Engineering

ISBN:

9781119285915

Author:

Seborg

Publisher:

WILEY

Industrial Plastics: Theory and Applications

Chemical Engineering

ISBN:

9781285061238

Author:

Lokensgard, Erik

Publisher:

Delmar Cengage Learning

Unit Operations of Chemical Engineering

Chemical Engineering

ISBN:

9780072848236

Author:

Warren McCabe, Julian C. Smith, Peter Harriott

Publisher:

McGraw-Hill Companies, The

SEE MORE TEXTBOOKS