KARAKTERISTIK PERPINDAHAN PANAS PADA LOOP THERMOSYPHON DENGAN FLUIDA KERJA R–134a BERTEKANAN 0,8 MPa
Abstract: Loop thermosyphon
heat exchanger (LTHE)
is a flexible
equipment and has a great
economical benefit. In thermosyphon, fluid with gas phase carry an amount of latent
heat from evaporator
towards condensor. In
this research, the thermosyphon consist of three parts,i.e.
evaporatorwith diameter of ¾ inch and length of 3.5 cm, the place where fluid
absorbs heat and change the liquid fluid into gas fluid. The second part of the
thermosyphonis condensor with diameter of ¾
inch and length
of 15 cm,
the place where
the gas fluid
is condensed and release heat. The third part is adiabatic
part where in this part no heat in and out from system and as a vapour line
with diameter of ¾inch and length of 25 cm and a liquid line with diameter of
3/8 inch and length of 27 cm. The
research of this loop thermosyphon heat exchanger has objectives to study the effectivity and the thermal
resistance of this heat exchanger with working fluid of refrigerant 134a at 0,8
MPa. The research was conducted at three air velocities (fluid which would be heated) of
0.8 m/s, 1
m/s, and 1.2
m/s and at
three evaporator
temperatures of 40°C, 50°C,
and 60°C. The
research was carried
out experimentally where
the heat source for evaporator from electric heater of 16 W, 36 W, and 60 W. From the research can be
concluded that the effectivity of the
LTHE with working fluid of R134a is about 22-35% and higher than LTHE with
working fluid of air that is 14-21%.
The thermal resistance
of LTHE with
working fluid R134a is 0.3-0.45oC/W and
lower than LTHE
with working fluid
of air that
is 0.95-1.9oC/W.
Penulis: Suyitno, Wibawa Endra
J, Heru Sukanto, Bobie Suhendra
Kode Jurnal: jptmesindd100127
