2. Calculate the quantity of heat in kJ to be transferred to 9.5 lb of brass to raise its temperature from 30°C to 485°F taking the specific heat of the brass as 0.394 kJ/kg- К.
2. Calculate the quantity of heat in kJ to be transferred to 9.5 lb of brass to raise its temperature from 30°C to 485°F taking the specific heat of the brass as 0.394 kJ/kg- К.
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
Related questions
Question
Task 1. Answer only 2
![TASK# 1. Solve problems involving heat transfer by convection processes.
Problem Solving
Instructions: Analyze and solve the following problems. Enclose your final
answer in a box.
In a hot air heating system, the furnace heats air from 66°F to 120°F. If the air is
then circulated at the rate of 510 ft³/min by the blower, how much thermal energy is
transferred per hour?
1.
Note: the specific heat of air at constant pressure is 0.250 Btu/lb°F, the density of air is 0.0806
lb/ft³ at atmospheric pressure.
2. Calculate the quantity of heat in kJ to be transferred to 9.5 lb of brass to raise its
temperature from 30°C to 485°F taking the specific heat of the brass as 0.394 kJ/kg-
К.
3. At an average temperature of 212°F, hot air flows through a 9 ft long tube with an
inside diameter of 55 mm. The temperature of the tube is 70°F along its entire
length. Convective film coefficient is 20.1 W/m²-K. Determine the convective heat
transfer from air to tube.
Brine enters a cooler at a rate of 58 m /hr at 63°F and leaves at 1°C. Specific heat
and specific gravity of brine are 1.117 kJ/kg-Kand 1.5 respectively. Calculate the
4.
heat transferred in kW.
5.
For heat transfer purposes, a standing man can be modeled as a 30 cm diameter, 170
cm long vertical cylinder with both the top and bottom surfaces insulated and with
the side surface at an average temperature of 34°C. For a convection heat transfer
coefficient of 15 W/m2 -°C, determine the rate of heat loss from this man by
convection in an environment at 20°C.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F036f384b-1783-4f05-832a-79311addcd6f%2F212d8b97-1ef6-4581-ade6-4541176993a7%2Fxj4yqj_processed.jpeg&w=3840&q=75)
Transcribed Image Text:TASK# 1. Solve problems involving heat transfer by convection processes.
Problem Solving
Instructions: Analyze and solve the following problems. Enclose your final
answer in a box.
In a hot air heating system, the furnace heats air from 66°F to 120°F. If the air is
then circulated at the rate of 510 ft³/min by the blower, how much thermal energy is
transferred per hour?
1.
Note: the specific heat of air at constant pressure is 0.250 Btu/lb°F, the density of air is 0.0806
lb/ft³ at atmospheric pressure.
2. Calculate the quantity of heat in kJ to be transferred to 9.5 lb of brass to raise its
temperature from 30°C to 485°F taking the specific heat of the brass as 0.394 kJ/kg-
К.
3. At an average temperature of 212°F, hot air flows through a 9 ft long tube with an
inside diameter of 55 mm. The temperature of the tube is 70°F along its entire
length. Convective film coefficient is 20.1 W/m²-K. Determine the convective heat
transfer from air to tube.
Brine enters a cooler at a rate of 58 m /hr at 63°F and leaves at 1°C. Specific heat
and specific gravity of brine are 1.117 kJ/kg-Kand 1.5 respectively. Calculate the
4.
heat transferred in kW.
5.
For heat transfer purposes, a standing man can be modeled as a 30 cm diameter, 170
cm long vertical cylinder with both the top and bottom surfaces insulated and with
the side surface at an average temperature of 34°C. For a convection heat transfer
coefficient of 15 W/m2 -°C, determine the rate of heat loss from this man by
convection in an environment at 20°C.
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