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A passive solar house was determined to lose heat to the outdoors at an average rate of 50,000 kJ/h during a typical 10-hour winter night. The house is to be maintained at 22°C at all times. Passive heating is accomplished by 50 glass containers each containing 20 L of water that is heated to 80°C during the day by absorbing solar energy. A 15-kW back-up electric resistance heater turns on whenever necessary to keep the house at 22°C. (a) How many hours does the electric heating system run during a typical winter night? (b) How many hours would the electric heater run during a typical winter night if the house did not have passive solar heating? For the density and specific heat of water at room temperature, use p = 1 kg/L and cp = 4.18 kJ/kg.°C

A passive solar house was determined to lose heat to the outdoors at an average rate of 50,000 kJ/h during a typical 10-hour winter night. The house is to be maintained at 22°C at all times. Passive heating is accomplished by 50 glass containers each containing 20 L of water that is heated to 80°C during the day by absorbing solar energy. A 15-kW back-up electric resistance heater turns on whenever necessary to keep the house at 22°C. (a) How many hours does the electric heating system run during a typical winter night? (b) How many hours would the electric heater run during a typical winter night if the house did not have passive solar heating? For the density and specific heat of water at room temperature, use p = 1 kg/L and cp = 4.18 kJ/kg.°C

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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A passive solar house was determined to lose heat to the outdoors at an average rate of 50,000 kJ/h during a typical 10-hour winter night. The house is to be maintained at 22°C at all times. Passive heating is accomplished by 50 glass containers each containing 20 L of water that is heated to 80°C during the day by absorbing solar energy. A 15-kW back-up electric resistance heater turns on whenever necessary to keep the house at 22°C. (a) How many hours does the electric heating system run during a typical winter night? (b) How many hours would the electric heater run during a typical winter night if the house did not have passive solar heating? For the density and specific heat of water at room temperature, use p = 1 kg/L and cp = 4.18 kJ/kg.°C
Transcribed Image Text:A passive solar house was determined to lose heat to the outdoors at an average rate of 50,000 kJ/h during a typical 10-hour winter night. The house is to be maintained at 22°C at all times. Passive heating is accomplished by 50 glass containers each containing 20 L of water that is heated to 80°C during the day by absorbing solar energy. A 15-kW back-up electric resistance heater turns on whenever necessary to keep the house at 22°C. (a) How many hours does the electric heating system run during a typical winter night? (b) How many hours would the electric heater run during a typical winter night if the house did not have passive solar heating? For the density and specific heat of water at room temperature, use p = 1 kg/L and cp = 4.18 kJ/kg.°C
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