1. TEKNIK MESIN FAKULTAS TEKNOLOGI INDUSTRI UNIVERSITAS MERCU BUANA
MODUL KE SEBELAS
THERMODINAMIKA DASAR
NANANG RUHYAT
SIKLUS BARYTON
Penemunya adalah seorang engineer dari Amerika bernama George Brayton ( ).
Siklus Brayton adalah sebuah siklus yang bertekanan tetap. Siklus ini juga dikenal sebagai
Siklus Joule.
In 1872, Brayton filed a patent for his "Ready Motor" which, unlike the Otto or Diesel cycles,
used a separate compressor and expansion cylinder. Today the Brayton cycle is generally
associated with gas turbines.
Like other internal combustion power cycles, The Brayton cycle is an open system, though
for thermodynamic analysis it is conventionally assumed that the exhaust gases are reused
in the intake, enabling analysis as a closed system
A Brayton-type engine consists of three components:
A gas compressor
A mixing chamber
An expander
In the original 19th-century Brayton engine, ambient air is drawn into a piston compressor,
where it is compressed; ideally an isentropic process. The compressed air then runs through
a mixing chamber where fuel is added, a constant-pressure (isobaric) process. The
heated(by compression), pressurized air and fuel mixture is then ignited in an expansion
cylinder and energy is released, causing the heated air and combustion products to expand
through a piston/cylinder; another theoretically isentropic process . Some of the work
PUSAT PENGEMBANGAN BAHAN AJAR-UMB
Ir. Nanang Ruhyat
THERMODINAMIKA DASAR 1
MT.

2. 3 http://www.mercubuana.ac.id Ir. Nanang Ruhyat THERMODINAMIKA DASAR
PUSAT PENGEMBANGAN BAHAN AJAR-UMB
Ir. Nanang Ruhyat
THERMODINAMIKA DASAR 3
MT.

3. Regeneration, wherein the still-warm post-turbine fluid is passed through a heat
exchanger to pre-heat the fluid just entering the combustion chamber. This allows for
lower fuel consumption and less power lost as waste heat.
A Brayton engine also forms half of the combined cycle system, which combines with a
Rankine engine to further increase overall efficiency. Cogeneration systems make use of
the waste heat from Brayton engines, typically for hot water production or space heating.
Brayton’s Concept
Proses kompresor dan turbin adalah isentropik 1
FUEL
HEATER
COMPRESSOR
TURBIN
Fresh Air
OUT
WORK
COOLER
BRAYTON CYCLE
PUSAT PENGEMBANGAN BAHAN AJAR-UMB
Ir. Nanang Ruhyat
THERMODINAMIKA DASAR 5
MT.