Abstract:
This research aimed to study energy saving for split type air conditioner using condenser exhaust
duct. The objective of this research was to design and construct the condenser exhaust duct made of
future board aluminium and steel coated with zinc. The shape of this duct was cylindrical with
diameter of 42 em. Its length was 30cm, 40 em and 50 em respectively. It was installed with 3
lengths, 30 cm, 40 cm and 50 cm respectively, of condensers of split type air conditioner which had
rating of 18,000 BTU/hour with diameter of 47 cm. These three lengths of this duct was also
installed with condensers of split type air conditioner which had rating of 22,000 BTU/hour with
diameter of 52 cm and condensers of split type air conditioner which had rating of 26,000
BTU/hour. The experiment were done to compare factors which affected split type air conditioner
performance and economics optimization of the condenser exhaust duct. The conditions of all
experiment were controlled to be the same. The results showed that the condenser exhaust duct with
the length of 50 cm gave the highest coefficient of performance (COP). Results were that the 18000
BTU/hour split type air conditioner had highest COP at 3.96. This value increased 14% from the old
one and then the 255.90 kWhr/year of electrical energy was reduced. This meant that 1061.33
baht/year of electrical energy was saved. The payback time for using future board was 0.047 year.
The 22000 BTU/hour split type air conditioner had highest COP at 3.98. This value increased
17.37% from the old one and then the 303.30 kWhr/year of electrical energy was reduced. This
meant that 1257.91 baht/year of electrical energy was saved. The payback time for using future
board was 0.040 yearBTU/hr. The 26000 bTU/hour split type air conditioner had highest COP at
3.95. This value increased 15.33% from the old one and then the 417.30 kWhr/year of electrical
energy was reduced. This meant that 1730.72 baht/year of electrical energy was saved. The payback
time for using future board was 0.029 year.