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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.

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.

Introduction to Chemical Engineering Thermodynamics
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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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.
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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