Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The house is losing heat to the outside air through the walls and the windows at a rate of 60,000 kJ/h while the energy generated within the house from people, lights and appliances amounts to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump. (Answer: 6.22 kW) bly. Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses from the house are estimated to be 55,000 kJ/h. Determine the minimum power required to run this heat pump if heat is extracted from (a) the outdoor air at -4°C and (b) the well water at 10°C (Answer: 1.53 kW, 0.82 kW)
Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The house is losing heat to the outside air through the walls and the windows at a rate of 60,000 kJ/h while the energy generated within the house from people, lights and appliances amounts to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump. (Answer: 6.22 kW) bly. Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses from the house are estimated to be 55,000 kJ/h. Determine the minimum power required to run this heat pump if heat is extracted from (a) the outdoor air at -4°C and (b) the well water at 10°C (Answer: 1.53 kW, 0.82 kW)
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
5.6 and 5.7
![DIY
Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The
house is losing heat to the outside air through the walls and the windows at a rate of 60,000
kJ/h while the energy generated within the house from people, lights and appliances amounts
to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump.
(Answer: 6.22 kW)
bly
Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be
always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses
from the house are estimated to be 55,000 kJ/h.
Determine the minimum power required to run this heat pump if heat is extracted from (a) the
outdoor air at -4°C and (b) the well water at 10°C
Problem 5.8 A refrigerator is to remove heat from the cooled space at a rate of 300 kJ/min
to maintain its temperature at -8°C. If the air surrounding the refrigerator is at 25°C, determine
the minimum power input required for this refrigerator.
25°C
-ft
wnet in
ac = 300kJ/min
- 8C
COPE, rev
Ju
TM-T₂
2.65
298-265
8.03
COPR = PL
сорк
COPR =
COPR
(Answer: 1.53 kW, 0.82 kW)
weet, in
SKTV
Wnet in
QL
QH-QL
(Answer: 0.623 kW)
137](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F34e8a647-576a-442a-b00f-9306c452585e%2F37ce8515-2f9a-4242-bc6b-003c2d5b2de3%2Fncry50o_processed.jpeg&w=3840&q=75)
Transcribed Image Text:DIY
Problem 5.6 A heat pump is used to maintain a house at a constant temperature of 23°C. The
house is losing heat to the outside air through the walls and the windows at a rate of 60,000
kJ/h while the energy generated within the house from people, lights and appliances amounts
to 4000 kJ/h. For a COP of 2.5, determine the required power input to the heat pump.
(Answer: 6.22 kW)
bly
Problem 5.7 A heat pump is to be used for heating a house in winter. The house is to be
always maintained at 26°C. When the temperature outdoors drops to -4°C, the heat losses
from the house are estimated to be 55,000 kJ/h.
Determine the minimum power required to run this heat pump if heat is extracted from (a) the
outdoor air at -4°C and (b) the well water at 10°C
Problem 5.8 A refrigerator is to remove heat from the cooled space at a rate of 300 kJ/min
to maintain its temperature at -8°C. If the air surrounding the refrigerator is at 25°C, determine
the minimum power input required for this refrigerator.
25°C
-ft
wnet in
ac = 300kJ/min
- 8C
COPE, rev
Ju
TM-T₂
2.65
298-265
8.03
COPR = PL
сорк
COPR =
COPR
(Answer: 1.53 kW, 0.82 kW)
weet, in
SKTV
Wnet in
QL
QH-QL
(Answer: 0.623 kW)
137
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