Abdalla Gomaa /et al /Engineering Research Journal 162 (June 2019) M1- M16 1 M Experimental Investigation of Low GWP Refrigerants Applied to Split Air Conditioner Abdalla Gomaa 1 , Fifi. N.M. Elwekeel 1 , Ibrahim Saber 2 , Asmaa Khaled 1 1-Department of Refrigeration and Air-Conditioning Technology, Faculty of Industrial Education, Helwan University. 2-Department of curricula and methods of teaching, Faculty of Education, Helwan University. ABSTRACT In this work, the thermal and environmental investigations for split air conditioner using low global warming potential (LGWP) refrigerants as alternatives to the present R22 are examined experimentally. Two alternative refrigerants of R290 (GWP=20) and R152a (GWP=133) are examined instead of R22 (GWP=1700). The experiments are carried out at different range of evaporator air velocities and evaporator air inlet temperatures. The experiments are conducted at evaporator air inlet temperatures of 31 o C, 38 o C and 48 o C, the air passes over evaporator coil with velocity of 0.5 to 1.6 m/s. The study parameters such as different evaporator air temperature, discharge temperature, cooling load, electrical compressor power, coefficient of performance, indirect global warming parameter and total equivalent warming parameter are investigated. The experimental results indicate that refrigerant R152a has the higher thermal performance than R22 and R290 and produces the lowest total equivalent warming parameter. At a certain evaporator air velocity is 1.2 m/s and the evaporator air inlet temperature is 31°C, the coefficient of performance of R152a is higher than that of R22 by 44.92%. The Total Equivalent Warming Impact of R290 and R152a are lower than that of R22 by 8.2 % and 30.03 %; respectively. Key words: LGWP; R22 alternatives; R290; R152a; split air conditioner; COP.
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Abdalla Gomaa /et al /Engineering Research Journal 162 (June 2019) M1- M16
1M
Experimental Investigation of Low GWP Refrigerants
Applied to Split Air Conditioner
Abdalla Gomaa1, Fifi. N.M. Elwekeel
1, Ibrahim Saber
2, Asmaa Khaled
1
1-Department of Refrigeration and Air-Conditioning Technology,
Faculty of Industrial Education, Helwan University.
2-Department of curricula and methods of teaching, Faculty of Education, Helwan University.
ABSTRACT
In this work, the thermal and environmental investigations for split air
conditioner using low global warming potential (LGWP) refrigerants as alternatives
to the present R22 are examined experimentally. Two alternative refrigerants of
R290 (GWP=20) and R152a (GWP=133) are examined instead of R22
(GWP=1700). The experiments are carried out at different range of evaporator air
velocities and evaporator air inlet temperatures. The experiments are conducted at
evaporator air inlet temperatures of 31oC, 38
oC and 48
oC, the air passes over
evaporator coil with velocity of 0.5 to 1.6 m/s. The study parameters such as
different evaporator air temperature, discharge temperature, cooling load, electrical
compressor power, coefficient of performance, indirect global warming parameter
and total equivalent warming parameter are investigated. The experimental results
indicate that refrigerant R152a has the higher thermal performance than R22 and
R290 and produces the lowest total equivalent warming parameter. At a certain
evaporator air velocity is 1.2 m/s and the evaporator air inlet temperature is 31°C,
the coefficient of performance of R152a is higher than that of R22 by 44.92%. The
Total Equivalent Warming Impact of R290 and R152a are lower than that of R22 by
Fig.5 Total equivalent warming impact versus indoor fan veiocity
Fig. 10. Indirect global warming potential
versus evaporator air inlet temperature
Fig. 11. Total equivalent warming impact
versus evaporator air inlet temperature
Abdalla Gomaa /et al /Engineering Research Journal 162 (June 2019) M14- M16
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6. CONCLUSION
The thermal and environmental investigations for split air conditioner using
R290 and R152a as R22 alternatives are examined experimentally at different range
of evaporator air velocities and evaporator air inlet temperatures. From the
experimental results can be concluded the following:
The evaporator air temperature differences of R290 and R152a are higher
than that of R22 by 5.22% and 6.09%; respectively at evaporator air velocity
of 1.2 m/s and evaporator air inlet temperature of 31°C.
When evaporator air velocity and evaporator air inlet temperature are1.2 m/s
and of 31 °C, R290 and R152a have higher cooling load than that of R22 by
4.95% and 5.77%; respectively.
The electrical compressor power is directly proportional to evaporator air
velocity and temperature. At a certain evaporator air velocity of 1.2 m/s and
the evaporator air temperature of 31°C, the electrical compressor power for
R290 and R152a are lower than that R22 by 3.45 % and 26.62%;
respectively.
COP increases when using R290 and R152a as R22 alternatives by 8.9% and
44.92 %; respectively. At a certain evaporator air velocity of 1.2 m/s and the
evaporator air inlet temperature of 31°C.
The compressor lifetime increases using R152a compared with R22.
Whereas R152a has lowest discharge temperature, at a certain evaporator air
velocity of 1.3 m/s and evaporator air temperature of 38°C. The discharge
temperature of R152a is lower than R22 by 59.16 %.
R152a presents best environmental performance than R290 and R22; which
has lowest TEWI in a different range of the evaporator air velocities and the
evaporator air inlet temperatures. The TEWI of R152a deceases by 30.03 %
than R22 at evaporator air velocity of 1.2 m/s and evaporator air inlet
temperature of 31°C.
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