Initially, the room contains 1.2 kg of air at 100 kPa. The steam radiator transfers heat at a rate of 100 kJ/h, and a 10 W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 50 kJ/h. During the process, the pressure is increased linearly until 110 kPa after x of operating hours when the final volume is equal 1.1 m3. You must follow the following steps to help your customer: STEP 1 Assume the air in the room is a perfect gas, explain the relationships between system constants then find the temperature at all states. STEP 2 Describe the operation of the thermodynamic system in Figure 1 and its properties, by constructing a P-V and T-V plots showing the process and the path. STEP 3 Explain the application of the first law of thermodynamics to the system. After that, explain the system parameters in terms of energy forms and interactions using the non-flow energy equation (NFEE) for the system and how they affect other parameters such as the final air temperature. STEP 4 Illustrate the importance of expressions for work done and find the value of the operating hours. STEP 5 Assume that the air pressure is increased in a polytropic process, determine the index of compression, n.

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

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Initially, the room contains 1.2 kg of air at 100 kPa. The steam radiator transfers heat at a rate of 100 kJ/h, and a 10 W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 50 kJ/h. During the process, the pressure is increased linearly until 110 kPa after x of operating hours when the final volume is equal 1.1 m3.
You must follow the following steps to help your customer:
STEP 1
Assume the air in the room is a perfect gas, explain the relationships between system constants then find the temperature at all states.
STEP 2
Describe the operation of the thermodynamic system in Figure 1 and its properties, by constructing a P-V and T-V plots showing the process and the path.
STEP 3
Explain the application of the first law of thermodynamics to the system. After that, explain the system parameters in terms of energy forms and interactions using the non-flow energy equation (NFEE) for the system and how they affect other parameters such as the final air temperature.
STEP 4
Illustrate the importance of expressions for work done and find the value of the operating hours.
STEP 5
Assume that the air pressure is increased in a polytropic process, determine the index of compression, n.

You are an engineer in a company that manufactures and designs several mechanical
systems, and your manager asked you to help your customers. In this time, you have
two customers who would like to analyze a rubber room and a fan for a personal
computer with paticular specifications. Follow the parts in the following tasks to do
your job and support your customers.
Task 1:
Your first customer asked for a 1-m x l-m x l-m rubber room that is heated by a
steam-radiator system. Your role in your company is to analyze, describe the
operation of the system and their properties, explain and demonstrate the
application of the frst law of thermodynamies to this system. In addition, you are
required to illustrate the importance of expressions for work done in the system
through the application of the first law.
50 kJ/h
Room
im x 1m x 1m
100 kJ/h
Steam
pu
(Cengel)
Figure 1: Schematic for task 1.

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