how year round air refrigeration works

1. YEAR ROUND AIR CONDITIONING
Shubham Gade
Samay Shah
Parijat Malik
Divesh Jumani
Aditya Bharadwaj

2. contents
• History
• summer Air Conditioning system
• Winter air conditioning systems
• Year rounnd air conditioning systems
• Design Features for year round air
conditioning
• Applications

3. Factors affecting comfort air
conditioning
1) Temperature of air: Maintenance of any
desired temperature within closed space
irrespective of the outside temperature. This
is done by addition or removal of heat
2) Humidity: Maintaining the RH means to
maintain the moisture of the the air by
removing or adding the moisture by proper
means.
Human body is comfortable at 210C and 60%RH

4. • 3) Purity of the air: We do not feel comfortable
while breathing contaminated air even if it is at
comfortable temperature and RH. So proper
filtration and cleaning of the air is required
• Motion of air Circulation of the air is important
to maintain the constant temperature. So there
must be equi-distribution of the air throughout
the space to be conditioned.

5. Components of air conditioner
• Circulation fan- Move the air to and from the room
• air conditioning unit- It is unit which consists of cooling and
dehumidifying processes for summer and heating and
humidification for winter.
• Supply duct- It directs the conditioned air from the
circulating fan to the space to be air conditioned at proper
point.
• supply outlet- These are grills which distribute the
conditioned air evenly in the room.
• return outlets- these are the opening in a room surface
which allow the room air to enter the return duct
• Filters – The main function of the filter Is to remove dust ,
dirt and other harmful bacteria.

6. Summer air conditioning
• It is used where cooling and dehumidification of air is
required
• Hot flows through the damper, and mixes up with
recirculated air.
• Mixed air passes through the filter
• Air passes through the cooling coil whose surface
temperature is below the DPT of the air
• Air gets cooled and dehumidified, condensed water gets
collected I the sump
• After that it passes through the heating coil to get heated
to a designed temperature.
• Conditioned air is supplied to the room by fans.

7. Flow diagram of summer air
conditioning unit

8. • In few areas in the world it is vary difficult to
live in winter
• Winter air conditions are used to heat the
space for human comfort
• Its input and output is reversed to that of the
summer air conditioner
• outside cold air is taken in and hot,
humidified air is supplied to the room.
•

9. Winter air conditioning
• In winter outside air temperature is less than the
human comfort temperature and RH is also less.
• Its components are same as that of the summer
air conditioning system
• Only the difference is heating coils are used
whose temperature is greater that DBT of
incoming air
• Air gets heated and humidified to a designed
condition and supplied to room

10. Flow diagram of winter air
conditioning system

11. Year round air conditioning system
• In several countries both winter and summer
is uncomfortable
• Under such adverse weather condition air
conditioner must provide comfort
conditioning throughout the year
• Such system is known as year round air
conditioning
•

12. Functions of Year round air
conditioning
• Heating and humidification of air in winter
• cooling and dehumidification in summer

13. Working of Year round air conditioning
unit
Year round air conditioning can be obtained by
Using vapour as a refrigerant with additional
humidifier and re-heater

14. Air washer
• In air washer an air is passed through the water
stream
• Temperature of water is below DPT of incoming
air for cooling purpose
• Temperature of water is above DBT of the
incoming air for heating purpose.
• According to the outside air condition and room
designed condition temperature of water is
maintained either by external cooling or heating.

15. Air Washer

16. By using vapour as a refrigerant
• In this system cooling and heating coils acts as
evaporator and condenser
• Vapour is used as a refrigerant
• Compressor is required for circulation of
refrigerant
• Valves are used to control the flow rate and
direction of the refrigerant according to the
requirement
• Pumps are used to regulate the flow of water

17. Year round air conditioning for winter

18. Year round air conditioning for winter
1) Cold air is taken in, mixed with the
recirculated air
2)It is passed over the heating coils which acts
as a condenser and gets heated
3) It is then humidified, by passing it through
humidifier
4) This conditioned air is supplied to room
where hot and humid air is required

19. • Refrigerant is then passed through the to the
evaporator where it evaporates using outside
air.
• Receiver and compressors are required for
the proper circulation of the refrigerant.

20. Year round air conditioner for summer
• Hot outside air is taken in, it is passed
through filters
• Air is mixed with the recirculated air
• It is now passed through the cooling coils
which acts as an evaporator
• Cooled and dehumidified air is supplied to
room

21. • Refrigerant is passed through to the
condenser where it condenses and returns to
the receiver
• Condensation is done by the outside air only.

22. Year round air conditioning- setting for summer

23. • An evaporator during the winter operation
acts as a condenser in summer and vice versa .
• In both the systems condensation and
evaporation of refrigerant is done using the
outside air so no external cooling or heating is
required
• Proper valve adjustment is required and its
control is required for proper functioning of
system