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Q1. Water is being pumped from the bottom of a well 20 ft deep at the rate of 2000 lb /hr into a vented storage tank to maintain a level of water in a tank 170 ft above the ground. To prevent freezing in the winter a heater puts 35,000 Btu/hn into the water during its transfer from the well to the storage tank. Heat is lost from the whole system at the constant rate of 28,000 Btu/hr. What is the temperature of the water as it enters the storage tank, assuming that the well water is at 36°F? A 2.5 hp pump is being used to pump the water. About 60% of the rated horsepower goes into the work of pumping and the rest is dissipated as heat to the atmosphere.

Q1. Water is being pumped from the bottom of a well 20 ft deep at the rate of 2000 lb /hr into a vented storage tank to maintain a level of water in a tank 170 ft above the ground. To prevent freezing in the winter a heater puts 35,000 Btu/hn into the water during its transfer from the well to the storage tank. Heat is lost from the whole system at the constant rate of 28,000 Btu/hr. What is the temperature of the water as it enters the storage tank, assuming that the well water is at 36°F? A 2.5 hp pump is being used to pump the water. About 60% of the rated horsepower goes into the work of pumping and the rest is dissipated as heat to the atmosphere.

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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Q1. Water is being pumped from the bottom of a well 20 ft deep at the rate of 2000 lb /hr into a vented storage tank to maintain a level of water in a tank 170 ft above the ground. To prevent freezing in the winter a heater puts 35,000 Btu/hr into the water during its transfer from the well to the storage tank. Heat is lost from the whole system at the constant rate of 28,000 Btu/hr. What is the temperature of the water as it enters the storage tank, assuming that the well water is at 36°F? A 2.5 hp pump is being used to pump the water. About 60% of the rated horsepower goes into the work of pumping and the rest is dissipated as heat to the atmosphere. Q2. 1000 lb of 10% NAOH solution at100°F is to be fortified to 30% NaOH by adding 73% NAOH at 200°F. How much 73% solntion must be used? How much cooling must be provided so that the final temperature will be 70 F? Q3. Humid air at 1 atm and 200 °F, and containing 0.0645 Ib of HO/lb of dry air, enters a cooler at the rate of 1000 lb of dry air per hour (plus accompanying water vapor). The air leaves the cooler at 100 °F, saturated with water vapor (0.0434 Ib of H,O/lb of dry air.(Thus 0.0211 lb H,O is condensed per pound of dry air. How much heat is transferred to the cooler? DEST WISHES
Transcribed Image Text:Q1. Water is being pumped from the bottom of a well 20 ft deep at the rate of 2000 lb /hr into a vented storage tank to maintain a level of water in a tank 170 ft above the ground. To prevent freezing in the winter a heater puts 35,000 Btu/hr into the water during its transfer from the well to the storage tank. Heat is lost from the whole system at the constant rate of 28,000 Btu/hr. What is the temperature of the water as it enters the storage tank, assuming that the well water is at 36°F? A 2.5 hp pump is being used to pump the water. About 60% of the rated horsepower goes into the work of pumping and the rest is dissipated as heat to the atmosphere. Q2. 1000 lb of 10% NAOH solution at100°F is to be fortified to 30% NaOH by adding 73% NAOH at 200°F. How much 73% solntion must be used? How much cooling must be provided so that the final temperature will be 70 F? Q3. Humid air at 1 atm and 200 °F, and containing 0.0645 Ib of HO/lb of dry air, enters a cooler at the rate of 1000 lb of dry air per hour (plus accompanying water vapor). The air leaves the cooler at 100 °F, saturated with water vapor (0.0434 Ib of H,O/lb of dry air.(Thus 0.0211 lb H,O is condensed per pound of dry air. How much heat is transferred to the cooler? DEST WISHES
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