1. Cooling load calculation- conduction through exterior walls, roof and glass- The exterior walls of the room gain heat from the sun by the way of conduction. The amount of heat depends on the wall material and its allignment with respect to the sun.If the wall is exposed in wset direction it will gain maximum heat during 2 to 5 pm.The heat gained by the wall facing north direction is the least. The glass(windows) of the room are directly exposed to the surroundings and the heat enters the room through glass (windows) by the way of radiation. The heat gained by the room through windows depends on their alignmment. If there are curtains on the windows the heat gained by radiation reduces. If the roof is directly exposed to the sun it absorbs maximum heat. Conduction through interior partings, ceilings and floor- The heat gained by partition of the room depends on the type of partition. People- The people inside the room generate heat. the heat dissipated by working people is more than by sitting people. Equipments and appliances- Heat is generated by electrical appliances like lights, motors, coffee-makers, electronic equipments should be considered for heat load calculations. Heat from infiltration of outside air through and openings- Outside air is normally at a greater temperature than the room temperature. when this air comes inside the room it brings certain amount of heat with it. 2. Equipment Selection- chiller- the chiller types of central air conditioning plants are installed in the places where large buildings, shopping mall, hotel, etc. including several floors are to be air conditioned. While in the direct expansion type of central air condtioning plant , refrigerant is directly used to cool the room air. In the chilled water plants the refrigerant first chills the water which in turn chills the room air. In chilled water plant, the ordinary water or brine solution is chilled to a very low temperature of about 6 to 8 degree celcius by the refrigerant plant. this chilled water is pumped to varioous floors of the building. In each of these floors air handling units are installed which comprises of cooling coil, blower and ducts. the air passes over the cooling coil and gets cooled and is then passed to the air conditioned space Pump- The heat pumps operate on a reverse vapour compression cycle also called as reverse refrigeration cycle.The main function of heat pump is to heat the room when the atmospheric temperature is very low. In heat pump, the evaporator is located outside the room which is to be heated. The evaporator absorbs the heat from the atmosphere which is at lower temperature. The condenser serves the main function of heating the room and is placed inside the room to be heated. Air-handling unit- Air-handling units are used for applications like big hotels, large buildings having multiple floors, where very high cooling loads are required. The window and split-air are used for small rooms or small office spaces. If the.

1. 1. Cooling load calculation-
conduction through exterior walls, roof and glass-
The exterior walls of the room gain heat from the sun by the way of conduction. The amount of
heat depends on the wall material and its allignment with respect to the sun.If the wall is exposed
in wset direction it will gain maximum heat during 2 to 5 pm.The heat gained by the wall facing
north direction is the least.
The glass(windows) of the room are directly exposed to the surroundings and the heat enters the
room through glass (windows) by the way of radiation. The heat gained by the room through
windows depends on their alignmment. If there are curtains on the windows the heat gained by
radiation reduces.
If the roof is directly exposed to the sun it absorbs maximum heat.
Conduction through interior partings, ceilings and floor-
The heat gained by partition of the room depends on the type of partition.
People-
The people inside the room generate heat. the heat dissipated by working people is more than by
sitting people.
Equipments and appliances-
Heat is generated by electrical appliances like lights, motors, coffee-makers, electronic
equipments should be considered for heat load calculations.
Heat from infiltration of outside air through and openings-
Outside air is normally at a greater temperature than the room temperature. when this air comes
inside the room it brings certain amount of heat with it.
2. Equipment Selection-
chiller-
the chiller types of central air conditioning plants are installed in the places where large
buildings, shopping mall, hotel, etc. including several floors are to be air conditioned. While in
the direct expansion type of central air condtioning plant , refrigerant is directly used to cool the
room air. In the chilled water plants the refrigerant first chills the water which in turn chills the
room air. In chilled water plant, the ordinary water or brine solution is chilled to a very low
temperature of about 6 to 8 degree celcius by the refrigerant plant. this chilled water is pumped
to varioous floors of the building. In each of these floors air handling units are installed which
comprises of cooling coil, blower and ducts. the air passes over the cooling coil and gets cooled
and is then passed to the air conditioned space
Pump-
The heat pumps operate on a reverse vapour compression cycle also called as reverse

2. refrigeration cycle.The main function of heat pump is to heat the room when the atmospheric
temperature is very low. In heat pump, the evaporator is located outside the room which is to be
heated. The evaporator absorbs the heat from the atmosphere which is at lower temperature. The
condenser serves the main function of heating the room and is placed inside the room to be
heated.
Air-handling unit- Air-handling units are used for applications like big hotels, large buildings
having multiple floors, where very high cooling loads are required. The window and split-air are
used for small rooms or small office spaces. If the whole building is to be cooled then it is not
economical to install split or window unit in each and every room. in such cases cental air-
handling unit is installed.
3.Piping-
Solution
1. Cooling load calculation-
conduction through exterior walls, roof and glass-
The exterior walls of the room gain heat from the sun by the way of conduction. The amount of
heat depends on the wall material and its allignment with respect to the sun.If the wall is exposed
in wset direction it will gain maximum heat during 2 to 5 pm.The heat gained by the wall facing
north direction is the least.
The glass(windows) of the room are directly exposed to the surroundings and the heat enters the
room through glass (windows) by the way of radiation. The heat gained by the room through
windows depends on their alignmment. If there are curtains on the windows the heat gained by
radiation reduces.
If the roof is directly exposed to the sun it absorbs maximum heat.
Conduction through interior partings, ceilings and floor-
The heat gained by partition of the room depends on the type of partition.
People-
The people inside the room generate heat. the heat dissipated by working people is more than by
sitting people.
Equipments and appliances-
Heat is generated by electrical appliances like lights, motors, coffee-makers, electronic
equipments should be considered for heat load calculations.
Heat from infiltration of outside air through and openings-
Outside air is normally at a greater temperature than the room temperature. when this air comes
inside the room it brings certain amount of heat with it.

3. 2. Equipment Selection-
chiller-
the chiller types of central air conditioning plants are installed in the places where large
buildings, shopping mall, hotel, etc. including several floors are to be air conditioned. While in
the direct expansion type of central air condtioning plant , refrigerant is directly used to cool the
room air. In the chilled water plants the refrigerant first chills the water which in turn chills the
room air. In chilled water plant, the ordinary water or brine solution is chilled to a very low
temperature of about 6 to 8 degree celcius by the refrigerant plant. this chilled water is pumped
to varioous floors of the building. In each of these floors air handling units are installed which
comprises of cooling coil, blower and ducts. the air passes over the cooling coil and gets cooled
and is then passed to the air conditioned space
Pump-
The heat pumps operate on a reverse vapour compression cycle also called as reverse
refrigeration cycle.The main function of heat pump is to heat the room when the atmospheric
temperature is very low. In heat pump, the evaporator is located outside the room which is to be
heated. The evaporator absorbs the heat from the atmosphere which is at lower temperature. The
condenser serves the main function of heating the room and is placed inside the room to be
heated.
Air-handling unit- Air-handling units are used for applications like big hotels, large buildings
having multiple floors, where very high cooling loads are required. The window and split-air are
used for small rooms or small office spaces. If the whole building is to be cooled then it is not
economical to install split or window unit in each and every room. in such cases cental air-
handling unit is installed.
3.Piping-