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psychrometric chart, find the total heat

psychrometric chart, find the total heat

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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Question 1 One pound of air at 95 F DB and 75 F WB is cooled and dehumidified to 80 F DB and 50% RH. Using the enthalpy scale on the psychrometric chart, find the total heat removed. (a) 38.6 Btu (b) 31.4 Btu (c) 7.2 Btu (d) 5 Btu Question 2 2000 cfm of air at 44°F DB and 40°F WB is mixed with 8000 cfm of air at 74°F DB and 40% RH. What is the relative humidity of the mixed air stream? (a) 45% (b) 80% (c) 20% (d) 100% Question 3 Air at 80°F DB and 50% RH is cooled and dehumidified to 50°F and 100% RH. What is the rate of sensible heat removed from 1,000 CFM of air? (a) 32,400 Btu/hr (b) 54,000 Btu/hr (c) 86,400 Btu/hr (d) 30,000 Btu/hr Question 4 Air at 30°F DB and 80% RH is heated to 75°F DB by passing it over a heating coil (i.e. sensible heating only). What is the relative humidity of the heated air? (a) 80% (b) 45% (c) 15% (d) 26%
Transcribed Image Text:Question 1 One pound of air at 95 F DB and 75 F WB is cooled and dehumidified to 80 F DB and 50% RH. Using the enthalpy scale on the psychrometric chart, find the total heat removed. (a) 38.6 Btu (b) 31.4 Btu (c) 7.2 Btu (d) 5 Btu Question 2 2000 cfm of air at 44°F DB and 40°F WB is mixed with 8000 cfm of air at 74°F DB and 40% RH. What is the relative humidity of the mixed air stream? (a) 45% (b) 80% (c) 20% (d) 100% Question 3 Air at 80°F DB and 50% RH is cooled and dehumidified to 50°F and 100% RH. What is the rate of sensible heat removed from 1,000 CFM of air? (a) 32,400 Btu/hr (b) 54,000 Btu/hr (c) 86,400 Btu/hr (d) 30,000 Btu/hr Question 4 Air at 30°F DB and 80% RH is heated to 75°F DB by passing it over a heating coil (i.e. sensible heating only). What is the relative humidity of the heated air? (a) 80% (b) 45% (c) 15% (d) 26%
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