PPT: Heat Pumps | Thermodynamics - Mechanical Engineering PDF Download

 Page 1


 
Heat Pumps
Page 2


 
Heat Pumps
What is a heat pump?
?
A heat pump enables energy-efficient heating 
?
It does not produce energy
?
It ‘pumps’ heat at a relatively lower 
temperature from air, water, or soil and gives 
it off at a higher temperature into a building 
Page 3


 
Heat Pumps
What is a heat pump?
?
A heat pump enables energy-efficient heating 
?
It does not produce energy
?
It ‘pumps’ heat at a relatively lower 
temperature from air, water, or soil and gives 
it off at a higher temperature into a building 
Pros and Cons
?
Advantages
–
Lower life cycle cost due to high efficiency 
–
Reduction of final energy demand by a factor 3
–
Reduction of CO2 emissions by 25 – 65% 
(depending on baseline)
–
Business opportunity for contractors
?
Disadvantages
–
To be combined with low-temperature heating in a well-
insulated building
–
High initial investment cost
–
Requires large soil surface or water volume 
(in case of a high efficiency water or soil heat pump)
Page 4


 
Heat Pumps
What is a heat pump?
?
A heat pump enables energy-efficient heating 
?
It does not produce energy
?
It ‘pumps’ heat at a relatively lower 
temperature from air, water, or soil and gives 
it off at a higher temperature into a building 
Pros and Cons
?
Advantages
–
Lower life cycle cost due to high efficiency 
–
Reduction of final energy demand by a factor 3
–
Reduction of CO2 emissions by 25 – 65% 
(depending on baseline)
–
Business opportunity for contractors
?
Disadvantages
–
To be combined with low-temperature heating in a well-
insulated building
–
High initial investment cost
–
Requires large soil surface or water volume 
(in case of a high efficiency water or soil heat pump)
Basic principle (1/2)
Refrigerator:
Heat is withdrawn from inside a 
refrigerator (low 
temperature)
Temperature inside refrigerator 
drops
Extracted heat is given off to 
environment (higher 
temperature)
Negligible temperature rise of 
the environment 
Heat pump:
Heat is withdrawn from 
environment: air, soil, or 
water (low temperature)
Negligible temperature drop of 
the environment
Extracted heat is given off into 
building (higher temperature)
Temperature of building’s 
interior rises 
Principle is similar to refrigerator:
Page 5


 
Heat Pumps
What is a heat pump?
?
A heat pump enables energy-efficient heating 
?
It does not produce energy
?
It ‘pumps’ heat at a relatively lower 
temperature from air, water, or soil and gives 
it off at a higher temperature into a building 
Pros and Cons
?
Advantages
–
Lower life cycle cost due to high efficiency 
–
Reduction of final energy demand by a factor 3
–
Reduction of CO2 emissions by 25 – 65% 
(depending on baseline)
–
Business opportunity for contractors
?
Disadvantages
–
To be combined with low-temperature heating in a well-
insulated building
–
High initial investment cost
–
Requires large soil surface or water volume 
(in case of a high efficiency water or soil heat pump)
Basic principle (1/2)
Refrigerator:
Heat is withdrawn from inside a 
refrigerator (low 
temperature)
Temperature inside refrigerator 
drops
Extracted heat is given off to 
environment (higher 
temperature)
Negligible temperature rise of 
the environment 
Heat pump:
Heat is withdrawn from 
environment: air, soil, or 
water (low temperature)
Negligible temperature drop of 
the environment
Extracted heat is given off into 
building (higher temperature)
Temperature of building’s 
interior rises 
Principle is similar to refrigerator:
Basic principle (2/2)