The discussion are also include about heat pump with its different function,type of heat pump,working procedure,application of heat pump,main component of heat pump.

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2. Submitted by
Submitted To
Group Member:
101-23-1927
101-23-1883
101-23-1973
101-23-1869
Raihan Tayeb
Lecturer of Textile Engineering
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3.  A heat pump is an electrical device that extracts
heat from one place and transfers it to another by
using mechanical energy. Examples: air
conditioner; refrigerator.
 In modern time heat pump is an essential part of a
heating and cooling system.
 Most heat pumps are driven by electrical power;
natural gas or Liquefied Petroleum Gas (LPG) can
power certain systems that drive an internal
combustion engine in place of a conventional
electric motor.
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4.  The two main types of heat pumps are:
01)compression heat pumps
02) absorption heat pumps
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5. compression heat pumps: Compression
heat pumps always operate on
mechanical energy while absorption
heat pumps may also run on heat as an
energy source.
absorption heat pumps: An absorption
heat pump may be fueled by natural
gas or LP gas.
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11.  Process stage 01: At the beginning of the cycle the refrigerant
(such as Freon) is in a liquid form This liquid refrigerant is very
cold. It enters the evaporator coil
 Process stage 02: After the refrigerant leaves the indoor
evaporator coil it has absorbed heat and become gas. The
refrigerant enters the compressor which mechanically pressurizes
the gas. That process will increase its temperature so the
refrigerant will leave the compressor as hot gas.
 Process stage 03: The refrigerant next moves to the condenser
coil located outside the house. Because the temperature
outside is lower than the temperature of the hot gas the heat is
transferred or “rejected” from the refrigerant in the coil to the
outside air.
 Process stage 04: The refrigerant leaves the outdoor condenser
coil as warm liquid. Now we need to make the warm liquid
refrigerant cold so that it can absorb more heat. Again to
repeat the cycle.
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13.  Evaporator: contais work fluid at lower temperature
than environment. Heat is extracted from ground, air or
water. So the work fluid evaporators.
 Compressor: brings gas to higher pressure , temperature
rises.
 Condenser: Gas temperature is higher than fluid
temperature of heating system. Excess heat is
transferred to fluid. The gas
cools and condenses.
 Expansion valve: causes pressure reduction, the
temperature dropes,and the cycle begins again.
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14.  all heat sources for a heat pump must
be colder in temperature than the
space to be heated. Most commonly,
heat pumps draw heat from the air
(outside or inside air) or from the ground
(groundwater or soil)
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15. There are few heating and cooling applications:
01) Domestic Applications:Many homes can now benefit from a variety of
installations, including ground source, most suitable for certain new-build
properties and small split or multi systems applied to existing premises.
02) Commercial Applications:Air to Air and Air to Water heat pumps are
frequently used in office and retails spaces, they are often installed in
ceiling voids or alcoves and offer substantially favourable cost
comparisons against conventional boiler systems when measured
against installation and running costs.
03)Others:Heat pumps are used in many industries, to recover heat or as an
integral part of the process. Swimming pools can use heat pumps as the
primary source of heat for the water in the pool, showers or to augment
an existing fossil fuel system. In enclosed swimming pools,
dehumidification is necessary and the heat recovered from the vapour
in the air by a de-humidifier is easily returned to heat incoming fresh air
or through a heat exchanger.
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